KURZWEIL PC2 Schematic

Page 1

PC2 Series

Service Manual

©2004 All rights reserved. Kurzweil is a product line of Young Chang Co.; Kurzweil is a trademark of Young Chang Co. All other products and brand names are trademarks or registered trademarks of their respective companies. Product features and speciﬁcations are subject to change without notice.

Part Number: 910395 Rev. A

Page 2

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

The lightning flash with the arrowhead symbol, within an equilateral triangle is intended to aler the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE THE COVER

NO USER SERVICEABLE PARTS INSIDE

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.

IMPORTANT SAFETY & INSTALLATION INSTRUCTIONS

INSTRUCTIONS PERTAINING TO THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS

WARNING: When using electric products, basic precautions should always be followed, including the following:

1. Read all of the Safety and Installation Instructions and Explanation of Graphic Symbols before using the product.

2. Do not use this product near water—for example, near a bathtub, washbowl, kitchen sink, in a wet basement, or near a swimming pool, or the like.

3. This product should be used only with a stand or cart that is recommended by the manufacturer.

4. This product, either alone or in combination with an ampliﬁer and speakers or headphones, may be capable of producing sound levels that could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult an audiologist.

5. The product should be located so that its location or position does not interfere with its proper ventilation.

6. The product should be located away from heat sources such as radiators, heat registers, or other products that produce heat.

7. The product should be connected to a power supply only of the type described in the operating instructions or as marked on the product.

8. This product may be equipped with a polarized line plug (one blade wider than the other). This is a safety feature. If you are unable to insert the plug into the outlet, contact an electrician to replace your obsolete outlet. Do not defeat the safety purpose of the plug.

9. The power supply cord of the product should be unplugged from the outlet when left unused for a long period of time. When unplugging the power supply cord, do not pull on the cord, but grasp it by the plug.

10. Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.

11. The product should be serviced by qualiﬁed service personnel when:

A. The power supply cord or the plug has been damaged;

B. Objects have fallen onto, or liquid has been spilled into the

product;

C. The product has been exposed to rain;

D. The product does not appear to be operating normally or

exhibits a marked change in performance;

E. The product has been dropped, or the enclosure damaged.

12. Do not attempt to service the product beyond that described in the user maintenance instructions. All other servicing should be referred to qualiﬁed service personnel.

13. WARNING: Do not place objects on the product’s power supply cord, or place the product in a position where anyone could trip over, walk on, or roll anything over cords of any type. Do not allow the product to rest on or be installed over cords of any type. Improper installations of this type create the possibility of a ﬁre hazard and/or personal injury.

RADIO AND TELEVISION INTERFERENCE

WARNING: Changes or modiﬁcations to this instrument not expressly

approved by Young Chang could void your authority to operate the instrument.

IMPORTANT: When connecting this product to accessories and/or other equipment use only high quality shielded cables.

NOTE: This instrument has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the instrument is used in a commercial environment. This instrument generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this instrument in a residential area is likely to cause harmful interference, in which case the user will be required to correct the interference at his or her own expense.

Changes and modiﬁcations not expressly approved by the manufacturer

SAVE THESE INSTRUCTIONS

or registrant of this instrument can void the user’s authority to operate this instrument under Federal Communications Commission rules.

In order to maintain compliance with FCC regulations, shielded cables must be used with this instrument. Operation with unapproved equipment or unshielded cables is likely to result in harmful interference to radio and television reception.

NOTICE

This apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications.

AVIS

Le present appareil numerique n’emet pas de bruits radioelectriques depassant les limites applicables aux appareils numeriques de la class A prescrites dans le Reglement sur le brouillage radioelectrique edicte par le ministere des Communications du Canada.

Page 3

Young Chang Distributors

Contact the nearest Young Chang ofﬁce listed below to locate your local Young Chang/Kurzweil representative.

A N D Music Corp.

P.O. Box 99995 Lakewood, WA 98499-0995 Tel: (253) 589-3200 Fax: (253) 984-0245

Young Chang Akki Co., Ltd.

178-55 Gajwa-Dong Seo-Ku, Inchon Korea 404-250 Tel: 011-82-32-570-1380 Fax: 011-82-32-570-1218

Young Chang America, Inc. (Canadian Division)

P.O. Box 61515 9350 Yonge Street Richmond Hill, Ontario Canada L4C 3N0 Tel: (905) 508-0531 Fax: (905) 508 1308

iii

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Page 5

Young Chang Distributors ............................................................................................................................................... iii

Chapter 1 Introduction

Models ....................................................................................................................................................................... 1-1

Notes, Cautions, Warnings ..................................................................................................................................... 1-1

PC2/PC2X ........................................................................................................................................................................ 1-2

PC2/PC2X Rear Panel............................................................................................................................................. 1-2

Rear Panel Features.................................................................................................................................................. 1-2

PC2/PC2X Front Panel............................................................................................................................................ 1-3

Front Panel Features................................................................................................................................................ 1-3

PC2R.................................................................................................................................................................................. 1-6

PC2R Rear Panel....................................................................................................................................................... 1-6

Rear Panel Features.................................................................................................................................................. 1-6

PC2R Front Panel ..................................................................................................................................................... 1-6

Front Panel Features................................................................................................................................................ 1-7

Chapter 2 Diagnostics

Diagnostic Tests ............................................................................................................................................................... 2-1

Entering Diagnostics....................................................................................................................................................... 2-2

Diagnostic Test Modes.................................................................................................................................................... 2-2

Run One Test............................................................................................................................................................. 2-2

Run Burn-in............................................................................................................................................................... 2-3

Test Results....................................................................................................................................................................... 2-3

Description of Tests......................................................................................................................................................... 2-4

ROM........................................................................................................................................................................... 2-4

Read-write................................................................................................................................................................. 2-4

RAM........................................................................................................................................................................... 2-4

MABEL ...................................................................................................................................................................... 2-4

LISA ........................................................................................................................................................................... 2-4

Sound ROM .............................................................................................................................................................. 2-4

ZRAM ........................................................................................................................................................................ 2-5

MIDI........................................................................................................................................................................... 2-5

LED............................................................................................................................................................................. 2-5

PCX-1 ROM............................................................................................................................................................... 2-5

PCX-1 RW.................................................................................................................................................................. 2-5

PCX-1 RAM............................................................................................................................................................... 2-5

PCX-1 MABEL.......................................................................................................................................................... 2-6

PCX-1 SROM............................................................................................................................................................. 2-6

Chapter 3 PC2R Disassembly/Assembly

Introduction ..................................................................................................................................................................... 3-1

Cables, Connectors................................................................................................................................................... 3-1

Flat Ribbon Cables............................................................................................................................................ 3-1

Cable Routing.................................................................................................................................................... 3-1

Required Tools and Materials................................................................................................................................. 3-1

Opening the PC2R........................................................................................................................................................... 3-2

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Kurzweil PC2 Series Service Manual

Contents

Removing the Top Cover ........................................................................................................................................ 3-2

Replacing the Top Cover......................................................................................................................................... 3-2

Removing the Connector Board............................................................................................................................. 3-3

Replacing the Connector Board ............................................................................................................................. 3-4

Removing the Polyphony Expansion Board (PCX-1) ......................................................................................... 3-5

Replacing the Polyphony Expansion Board (PCX-1).......................................................................................... 3-5

Removing the Engine Board................................................................................................................................... 3-6

Replacing the Engine Board ................................................................................................................................... 3-6

Front Panel Assembly..................................................................................................................................................... 3-8

Removing the Front Panel Assembly.................................................................................................................... 3-8

Replacing the Front Panel Assembly..................................................................................................................... 3-8

Removing the Front Panel Faceplate..................................................................................................................... 3-9

Replacing the Front Panel Faceplate ..................................................................................................................... 3-9

Front Panel Boards................................................................................................................................................... 3-9

Removing the Right Front Panel Board.............................................................................................................. 3-10

Replacing the Right Front Panel Board................................................................................................................3-11

Removing the LCD Board......................................................................................................................................3-11

Replacing the LCD Board ..................................................................................................................................... 3-12

Removing the Left Front Panel Board................................................................................................................. 3-12

Replacing the Left Front Panel Board ................................................................................................................. 3-13

Removing the Headphone/Volume/Power Switch Board ............................................................................. 3-14

Replacing the Headphone/Volume/Power Switch Board.............................................................................. 3-14

Chapter 4 PC2/PC2X Disassembly/Assembly

Introduction ..................................................................................................................................................................... 4-1

Notes, Cautions, Warnings ..................................................................................................................................... 4-1

Cables, Connectors................................................................................................................................................... 4-1

Flat Ribbon Cables............................................................................................................................................ 4-1

Cable Routing.................................................................................................................................................... 4-1

Required Tools and Materials................................................................................................................................. 4-1

Opening the PC2/PC2X ................................................................................................................................................. 4-2

PC2 Bottom ............................................................................................................................................................... 4-2

PC2X Bottom............................................................................................................................................................. 4-3

Removing the Top Enclosure.................................................................................................................................. 4-4

Replacing the Top Enclosure .................................................................................................................................. 4-6

Closing the PC2/PC2X............................................................................................................................................ 4-6

Top Enclosure................................................................................................................................................................... 4-7

Removing the Enclosure Support Walls ............................................................................................................... 4-8

Left Enclosure Support Wall............................................................................................................................ 4-8

Right Enclosure Support Wall......................................................................................................................... 4-8

Replacing the Enclosure Support Walls................................................................................................................ 4-8

Left Enclosure Support Wall............................................................................................................................ 4-8

Right Enclosure Support Wall......................................................................................................................... 4-8

Removing the Connector Board............................................................................................................................. 4-8

Replacing the Connector Board ........................................................................................................................... 4-10

Removing the Front Panel Board......................................................................................................................... 4-10

Replacing the Front Panel Board ......................................................................................................................... 4-12

Removing the LCD Board..................................................................................................................................... 4-13

Replacing the LCD Board ..................................................................................................................................... 4-13

Removing the Polyphony Expansion Board (PCX-1) ....................................................................................... 4-13

Replacing the Polyphony Expansion Board (PCX-1)........................................................................................ 4-14

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Kurzweil PC2 Series Service Manual

Contents

Removing the Slider Board................................................................................................................................... 4-14

Replacing the Slider Board ................................................................................................................................... 4-15

Removing the Engine Board................................................................................................................................. 4-15

Replacing the Engine Board ................................................................................................................................. 4-17

Removing the Mod Wheel Assembly.................................................................................................................. 4-17

Replacing the Mod Wheel Assembly .................................................................................................................. 4-18

PC2 Keyboard Assembly.............................................................................................................................................. 4-19

Removing the PC2 Keyboard Assembly............................................................................................................. 4-19

Replacing the PC2 Keyboard Assembly ............................................................................................................. 4-20

Disconnecting the PC2 Keyboard........................................................................................................................ 4-21

Connecting the Keyboard ..................................................................................................................................... 4-21

Removing Keys ...................................................................................................................................................... 4-22

Natural/White Key ........................................................................................................................................ 4-22

Natural/White Keys.............................................................................................................................................. 4-23

Sharp/Black Keys .................................................................................................................................................. 4-23

Replacing a Key...................................................................................................................................................... 4-24

Servicing the Keyboard Contact Boards............................................................................................................. 4-24

Removing the Treble Contact Board ............................................................................................................ 4-24

Replacing the Treble Contact Board............................................................................................................. 4-24

Removing the Bass Contact Board ............................................................................................................... 4-24

Replacing the Bass Contact Board................................................................................................................ 4-24

Removing the Keyboard Contact Strips ............................................................................................................. 4-25

Replacing the Keyboard Contact Strips.............................................................................................................. 4-25

PC2X Keyboard Assembly........................................................................................................................................... 4-26

Removing the PC2X Keyboard Assembly.......................................................................................................... 4-26

Replacing the PC2X Keyboard Assembly........................................................................................................... 4-27

Removing Keys ...................................................................................................................................................... 4-27

Natural/White Key ........................................................................................................................................ 4-28

Natural/White Keys.............................................................................................................................................. 4-28

Sharp/Black Keys .................................................................................................................................................. 4-29

Replacing a Key...................................................................................................................................................... 4-30

Servicing the Keyboard Contact Boards............................................................................................................. 4-30

Removing the Treble Contact Board ............................................................................................................ 4-30

Replacing the Treble Contact Board............................................................................................................. 4-30

Removing the Bass Contact Board ............................................................................................................... 4-30

Replacing the Bass Contact Board................................................................................................................ 4-31

Removing the Keyboard Contact Strips ............................................................................................................. 4-31

Replacing the Keyboard Contact Strips.............................................................................................................. 4-32

Removing a Key Weight........................................................................................................................................ 4-32

Replacing a Key Weight ........................................................................................................................................ 4-33

Chapter 5 Troubleshooting

Introduction ..................................................................................................................................................................... 5-1

Cables, Connectors................................................................................................................................................... 5-1

Flat Ribbon Cables............................................................................................................................................ 5-1

Cable Routing.................................................................................................................................................... 5-1

Surface-Mount Devices ........................................................................................................................................... 5-1

Saving User Data...................................................................................................................................................... 5-1

Boot Block......................................................................................................................................................................... 5-2

Entering the Boot Block........................................................................................................................................... 5-2

Resets................................................................................................................................................................................. 5-2

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Kurzweil PC2 Series Service Manual

Contents

Hard Reset................................................................................................................................................................. 5-2

Soft Reset ................................................................................................................................................................... 5-2

Software Updates ............................................................................................................................................................ 5-3

File Formats............................................................................................................................................................... 5-3

Installing the Operating System or Setups........................................................................................................... 5-3

Installing a New Boot Block ................................................................................................................................... 5-4

Installing Sound ROM Options.............................................................................................................................. 5-4

Replacing the Battery...................................................................................................................................................... 5-5

PC2 Keyboard Models............................................................................................................................................. 5-5

Accessing the Battery ....................................................................................................................................... 5-5

Removing the Battery....................................................................................................................................... 5-5

Installing the Battery ........................................................................................................................................ 5-5

PC2R Rack Models................................................................................................................................................... 5-6

Accessing the Battery ....................................................................................................................................... 5-6

Removing the Battery....................................................................................................................................... 5-6

Installing the Battery ........................................................................................................................................ 5-6

Scanner Tests.................................................................................................................................................................... 5-7

PC2R Rack Models................................................................................................................................................... 5-7

Front Panel Buttons .......................................................................................................................................... 5-7

Alpha Wheel...................................................................................................................................................... 5-7

Front Panel Knobs............................................................................................................................................. 5-7

PC2 Keyboard Models............................................................................................................................................. 5-8

Front Panel Buttons .......................................................................................................................................... 5-8

Alpha Wheel...................................................................................................................................................... 5-8

Front Panel Sliders............................................................................................................................................ 5-8

Wheels ................................................................................................................................................................ 5-9

Keyboard............................................................................................................................................................ 5-9

Switch Pedals 1, 2, and 3.................................................................................................................................. 5-9

Continuous Pedals 1 and 2 .............................................................................................................................. 5-9

Power Problems............................................................................................................................................................. 5-10

Dead ......................................................................................................................................................................... 5-10

Audio Problems............................................................................................................................................................. 5-10

No Audio................................................................................................................................................................. 5-10

Front Panel Problems.....................................................................................................................................................5-11

LCD not lit................................................................................................................................................................5-11

Buttons, Sliders or Controllers not working .......................................................................................................5-11

Keyboard Problems....................................................................................................................................................... 5-12

Dead Keyboard....................................................................................................................................................... 5-12

Dead Note(s)........................................................................................................................................................... 5-12

One or More in a Section................................................................................................................................ 5-12

Mechanical Noise............................................................................................................................................ 5-12

PC2R Interconnect Diagram ........................................................................................................................................ 5-13

PC2 Interconnect Diagram........................................................................................................................................... 5-14

Chapter 6 Parts Lists

Introduction ..................................................................................................................................................................... 6-1

PC2/PC2X Printed Circuit Boards and Assemblies............................................................................................ 6-1

PC2R Printed Circuit Boards and Assemblies ..................................................................................................... 6-2

PC2R/PC2/PC2X............................................................................................................................................................ 6-3

Engine Board, N012300051 ..................................................................................................................................... 6-3

PC2/PC2X ........................................................................................................................................................................ 6-5

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Kurzweil PC2 Series Service Manual

Front Panel Board, N012400052 ............................................................................................................................. 6-5

Connector Board, N012300061 ............................................................................................................................... 6-6

LCD Board, N012103800 ......................................................................................................................................... 6-8

Pitch & Mod Wheel Assembly, N012300053 ........................................................................................................ 6-8

Slider Board, N012400051 ....................................................................................................................................... 6-9

PC2 .................................................................................................................................................................................... 6-9

Final Assembly, N012000150 .................................................................................................................................. 6-9

Keyboard Assembly, N215040311........................................................................................................................ 6-10

PC2X.................................................................................................................................................................................6-11

Final Assembly N012000151 ..................................................................................................................................6-11

Keyboard Assembly, N215040413........................................................................................................................ 6-12

PC2R................................................................................................................................................................................ 6-13

Connector Board, N01230004 ............................................................................................................................... 6-13

Front Panel Assembly, N012300070..................................................................................................................... 6-14

Left Front Panel Board, N012300080 ................................................................................................................... 6-14

Right Front Panel Board, N012300090................................................................................................................. 6-15

Headphone/Volume/Power Switch Board, N012700019................................................................................ 6-15

LCD Board, N012103802 ....................................................................................................................................... 6-15

Final Assembly, N012000153 ................................................................................................................................ 6-16

Chapter 7 Schematics

Engine Board–Microprocessor (page 1 of 5)................................................................................................................ 7-3

Engine Board–Master/Slave Mabels (page 2 of 5)..................................................................................................... 7-4

Engine Board–Lisa F/X 128Ch Option, Clocks (page 3 of 5).................................................................................... 7-5

Engine Board–Sound ROM, Uart, Glue, Decoupling (page 4 of 5).......................................................................... 7-6

Engine Board–Audio Channel, Muting Control (page 5 of 5).................................................................................. 7-7

Front Panel and IBBB Board (keyboard models)–FP Buttons and LEDs (page 1 of 2).......................................... 7-8

Front Panel and IBBB Board (keyboard models)–IBBB Buttons and LEDs (page 2 of 2) ..................................... 7-9

Connector Board (keyboard models)–Scanner (page 1 of 3)................................................................................... 7-10

Connector Board (keyboard models)–Digital Interface (page 2 of 3).....................................................................7-11

Connector Board (keyboard models)–Power Supply/Audio (page 3 of 3).......................................................... 7-12

Slider Board (keyboard models)–Sliders ................................................................................................................... 7-13

Right Front Panel Board (rack models)–FP Buttons and LEDs (page 1 of 2) ....................................................... 7-14

Left Front Panel Board (rack models)–Controllers, FP Buttons and LEDs (page 2 of 2) .................................... 7-15

Connector Board (rack models)–Scanner (page 1 of 3)............................................................................................ 7-16

Connector Board (rack models)–Digital Interface (page 2 of 3) ............................................................................. 7-17

Connector Board (rack models)–Power Supply/Audio (page 3 of 3)................................................................... 7-18

Power/Volume/Headphone Board (rack models).................................................................................................. 7-19

Contents

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Kurzweil PC2 Series Service Manual

Contents

Page 11

Chapter 1 Introduction

This chapter provides the service technician with a layout of the front and rear panel features, as well as a brief explanation of thier functions. For in-depth descriptions of the many features the PC2 Series instruments include, consult the Musician’s Guide.

This chapter also includes a description of the models available in the PC2 Series and a description of the symbols used throughout this manual.

Note: If possible, all user programs and setups should be saved prior to opening the unit, entering the Boot Block to run diagnostics or to perform a hard reset. For instructions to save all user programs and setups, see Saving User Data in Chapter 5, page 5-1.

Models

There are three models in the PC2 series. The available models are listed below.

• PC2, 76-note keyboard

• PC2X, 88-note keyboard

• PC2R, rack-mount

Notes, Cautions, Warnings

Please pay special attention to all Notes, Cautions, and Warnings used throughout this manual as they not only point out speciﬁc instructions, but also alert you to differences between the PC2R rack units, the 76-note PC2 keyboard, and the 88-note PC2X keyboard. Certain chapters and sections are solely for the rack or keyboard units. Other chapters combine both the rack and keyboard units.

A brief description of these symbols follows:

Note: Provides additional information, indicates differences between models, and emphasizes speciﬁc instructions.

Caution: Instructs you to proceed cautiously so that damage does not occur to the unit or individual components.

Warning: Alerts you so that damage does not occur to yourself, others, or external devices.

1-1

Page 12

Introduction

PC2/PC2X

PC2/PC2X Rear Panel

Power

Connector

Power MIDI Pedals Inputs Audio Outs

I / 0

Adapter In

Thru / Out

9.0V 2.0A

14.0V~0.25A

Power Switch

MIDI

Select Switch

Figure 1-1 PC2 rear panel features

Rear Panel Features

Power Switch—Rocker switch to turn the power on and off.

Power Connector—Keyed four-pin connector to attach the Kurzweil 9VDC power adapter.

MIDI Select Switch—Slide switch to select the operation of the MIDI Thru/Out port. This

switch is recessed into the rear panel so that it cannot be accidentally changed.

Digital

Out

Digital

Switch

LCD

Contrast

LCD

Contrast

Out

Switch Pedals

Out

Thru / Out

MIDI

Ports

Breath

Input

Continuous

132

2 Right

Continuous

Control Pedals

Breath

Ribbon

Left Headphones

Audio

Outs

Ribbon

Input

Headphones

1-2

MIDI Ports—In, Thru/Out, and Out ports to connect the PC2 to other MIDI devices to receive, pass, and send MIDI data.

LCD Contrast—Rotary potentiometer to adjust the LCD for the best visibility.

Digital Out—RCA jack to connect to digital recorders and mixers.

Switch Pedals—Three 1/4” jacks to connect switch pedals that can be assigned to control

operations such as sustain, sostenuto, etc. (use 1/4” tip/sleeve).

Continuous Control Pedals—Two 1/4” jacks to connect pedals that can be assigned to control operations such as volume, expression, etc. (use 10KΩ linear taper potentiometer, 1/4” tip/ring/sleeve).

Breath Input—A 3.5mm jack to connect a standard breath controller.

Ribbon Input—Modular jack to connect the Kurzweil Ribbon Controller option.

Audio Outs—Balanced 1/4” left and right audio output jacks to connect to an ampliﬁer, mixer

or sound system.

Headphones—Standard 1/4” jack to connect headphones.

Page 13

PC2/PC2X Front Panel

Figure 1-2 is an illustration of the front panel for the PC2 and the PC2X. Enlargements of sections of this illustration follow, as well as a brief description of the front panel features.

Introduction

PC2/PC2X

Zone Select and Assignable Controllers

Main Layer Split Split Layer

Zone 1 Zone 2 Zone 3 Zone 4

Master Volume

Perc On / Off Volume Decay Pitch

ABCD

16'

2 2/3'

5 1/3'2'8'

H i g h

1 3/5'4'1 1/3'

Split Point

Master

Volume

Figure 1-2 PC2/PC2X Front Panel layout

Front Panel Features

Solo

Drawbar

Toggle

Octave Shift

SW1

Rotary

Fast / Slow

SW2

Chorus / Vib

On / Off

SW3

Chorus / Vib

Depth

cursor buttons

Sound / Setup Select

MIDI

Internal

Setups

Voices

Group

LCD and

KB3

Mode

Group VoicesStrings

Piano 2Piano 1

12345678

910111213141516

Zone

Parameters

Zone Parameters

MIDI Xmit Program Key Range Timbre Envelope LFO

Velocity Controllers Arpeggiator

Sound Source

Internal

E Piano 1

Synths

User Exp 1 Exp 2

E Piano 2

Pop Keys Clavier Organ

Pads

Transpose

Guitar

Bass Drums

Sound/Setup

Select

Zone Select and Assignable Controllers

Sound

Parameters

Sound Parameters

Functions

Compare Copy Store

Brass

Percussion

Demo

Sound

Source

System

Global MIDI Recv Panic

Effects and Reverb

FX-A Select Wet / Dry

Mute A

FX-B Select FX Mode

Mute B

Effects

and

Reverb

Alpha Wheel,

Minus (-) and Plus (+) buttons,

Alphanumeric keypad

Data Entry

Sound/Setup

Select

123

A B C D E F G H I

456

J K L M N O P Q R

789

S T U V W X Y Z

+ / - 0 Clear

UPPER / lower 0 - 9 Space

Cancel Enter

No Yes

Main Layer Split Split Layer

Solo

Drawbar

Toggle

Master

Volume

Zone 1 Zone 2 Zone 3 Zone 4

Perc On / Off Volume Decay Pitch

ABCD

Split Point

Octave Shift

SW1

Rotary

Fast / Slow

SW2

i g h

1 3/5'

1 1/3'

2 2/3'

5 1/3'

L o w

16'

Chorus / Vib

On / Off

SW3

Chorus / Vib

Depth

Figure 1-3 Master Volume, Zone Select and Assignable Controllers section

1-3

Page 14

Introduction

PC2/PC2X

Master Volume—Slidepot to adjust the overall volume.

Zone Select and Assignable Controllers—The operation of the buttons and sliders in this

section depends on which of the three performance modes is active. Their labelling is colorcoded to identify their function in each of the performance modes. They are labelled as follows: white–Internal Voices mode, blue–MIDI Setups mode, and orange–KB3 mode.

Zone Parameters

MIDI Xmit Program Key Range Timbre Envelope LFO

Velocity Controllers Arpeggiator

Sound Source

Internal

User Exp 1 Exp 2

Transpose

Sound Parameters

Functions

Compare Copy Store

System

Global MIDI Recv Panic

Figure 1-4 PC2 Front Panel, center section

LCD—Forty-character, two-line liquid crystal display.

Cursor buttons—These buttons move the cursor bar in the LCD. Generally, they select bank and

program ID parameters and some KB3 settings.

Zone Parameters—Each button in this section represents a menu of available parameters for use while editing setups.

Sound Source—Each button in this section selects a bank of programs or setups for each of the performance modes.

Sound Parameters—Each button in this section represents a menu of available parameters for use while editing programs in the Internal Voices and KB3 modes.

1-4

Functions—Use the buttons in this section while editing programs or settings to compare between an original and a modiﬁed setup or program, copy sections from one setup to another, and begin the process to store the changes.

System—The three buttons in this section select parameters that affect the entire unit. The Global button opens a menu of parameters such as: checking the version of the operating

system, available memory, performing a reset, dumping all objects, and running MIDIScope. The MIDI Receive button opens a menu to conﬁgure individual MIDI channels. The Panic button sends an All Notes Off message to the PC2 and the MIDI Out port. On power up, the Panic button is also used to enter the boot block to perform diagnostics, operating system updates, etc.

Page 15

Sound / Setup Select Effects and Reverb

Internal

Voices

Group

MIDI

Setups

KB3

Mode

Group VoicesStrings

Piano 2Piano 1

12345678

E Piano 1

910111213141516

Synths

E Piano 2

Pads

Pop Keys Clavier Organ

Guitar

Bass Drums

Demo

Brass

Percussion

FX-A Select Wet / Dry

Mute A

FX-B Select FX Mode

Mute B

Figure 1-5 Sound/Setup Select and Effects and Reverb sections

Sound/Setup Select—Three groups of buttons are included in this section. Use the buttons in the ﬁrst group to select one of the three performance modes: Internal Voices, MIDI Setups, or KB3 Mode. The second group, Previous Group and Next Group, is for use in the Internal Voices and MIDI Setups modes only. Depending on which mode you’re in, they select the previous or next group of programs or setups. Use the buttons in the third group, labelled 1–16, to select a category of Internal Voice programs or MIDI setups. In KB3 Mode, use these buttons to select one of the 16 KB3 programs.

Effects and Reverb—Use the buttons in this section to select from two blocks of effects to apply effects and reverb to programs and setups.

Introduction

PC2/PC2X

Data Entry

123

A B C D E F G H I

456

J K L M N O P Q R

789

S T U V W X Y Z

+ / - 0 Clear

UPPER / lower 0 - 9 Space

Cancel Enter

No Yes

Figure 1-6 Data Entry section

Data Entry—This section contains the Alpha Wheel, Minus (-) and Plus (+) buttons, and the Alphanumeric keypad. Use the Alpha Wheel or the Minus (-) and Plus (+) buttons to increase or decrease a value. Use the buttons in the Alphanumeric keypad to enter text, numbers, spaces, etc. This section also includes the Cancel (No) and Enter (Yes ) buttons.

Mod/Pitch Wheel Assembly (not shown)—Use the two wheels to vary modulation and pitch. Also included on the assembly is the SW4 and SW5 switches for use in the Internal Voices and MIDI Setups modes.

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Page 16

Introduction

PC2R

PC2R Rear Panel

Serial No.

Model: PC2R Manufacturer: Young Chang Co., Ltd. Designed in USA Made in R.O.K.

Audio

Outs

Figure 1-7 PC2R rear panel

Rear Panel Features

Audio Outs—Balanced 1/4” left and right audio output jacks to connect to an ampliﬁer, mixer or sound system.

Digital Out—RCA jack to connect to digital recorders and mixers.

MIDI Ports—In, Thru/Out, and Out ports to connect the PC2 to other MIDI devices to receive,

pass, and send MIDI data.

MIDI Select Switch—Slide switch to select the operation of the MIDI Thru/Out port.

Power In—Keyed four-pin connector to attach the Kurzweil 9VDC power adapter.

PC2R Front Panel

Figure 1-8 is an illustration of the front panel for the PC2R. Enlargements of sections of this illustration follow, as well as a brief description of the front panel features.

PC2R

Digital Out

Digital

Out

In Thru Out

MIDIAudio Outs

MIDI

Ports

Thru / Out

MIDI

Select Switch

Power In

9.0V 2.0A

14.0V~0.25A

Power

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING

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Power/

Volume

PUSH

PWR

Performance

VOL

Rotary Fast / Slow Perc On / Off Volume Decay Pitch

Performance

Zone 1 Zone 2 Zone 3 Zone 4

Main

ABCD

Shift

16'

2 2/3'

Figure 1-8 PC2R Front Panel

Layer

Split Split LayerSolo

5 1/3'2'8'

1 3/5'4'1 1/3'

Chorus / Vib

Pre-AmpDrawbar Toggle 1' Chorus / Vib

On / Off

Internal Voices

Modes

KB3

MIDI Setups

Panic

Demo

LCD

Edit

Edit Modes

PC2R

Edit / Store Group / Menu Compare Copy

Cancel Enter FX MIDI Receive Global

Depth

YesNo

LCDHeadphones

Contrast

Page 17

Front Panel Features

Power/Volume—Push to turn the power on/off and turn it to adjust the volume.

Headphones—Standard 1/4” jack to connect headphones.

Performance section—The buttons and knobs in this section are multi-function and their

operation depends on which performance mode is active (Internal Voices, KB3, or MIDI Setups). Their labelling is color-coded to identify their operation for each of the performance modes. They are labelled as follows: white–Internal Voices mode, blue–MIDI Setups mode, and orange–KB3 mode.

PWR

PUSH

VOL

Performance

Rotary Fast / Slow Perc On / Off Volume Decay Pitch

Shift

Zone 1 Zone 2 Zone 3 Zone 4

Main

ABCD

16'

2 2/3'

Layer

Pre-AmpDrawbar Toggle 1' Chorus / Vib

5 1/3'

Split Split LayerSolo

Chorus / Vib

1 3/5'

On / Off

1 1/3'

Depth

Introduction

PC2R

Figure 1-9 Power/Volume, Headphones and Performance section

The top row of buttons are for use in each of the three performance modes. The button LEDs are tri-colored: Red, Green, and Amber. The function of a button depends on which performance mode is active and the LED color. In the Internal Voices mode, use these buttons to enter AutoSplit mode to add layers and splits. In MIDI Setups mode, use these buttons to solo a zone or select a zone for viewing or editing. In KB3 mode, these buttons control the effects for the current KB3 program. Figure 1-9 is an enlargement of the Performance section. An example of the operation of the Split button in each performance mode follows:

Internal Voices mode, selecting the Split button switches to AutoSplit mode and adds a new sound below a preset split point.

MIDI Setups mode (Zone 3), selecting the Split button selects Zone 3.

KB3 mode (Decay), selecting the Split button switches between fast and slow decay for the percussion effect.

The bottom row includes the Shift button and Knobs A–D. The Shift button controls the operation of Knobs A–D. The Shift button LED is also tri-colored (green, amber, and red). The function of Knobs A–D depends on which performance mode is active and the LED color. In Internal Voices or MIDI Setups mode, Knobs A–D control parameters and settings. In KB3 Mode, Knobs A–D control such functions as drawbar lengths, etc.

Edit section—Use the eight buttons and the Alpha Wheel in this section to select programs and setups, and editing functions. Turn the Alpha Wheel to scroll through menus and categories to select a program or parameter. In Internal Voices and KB3 mode, use the Left and Right cursor buttons to select bank and program ID parameters, as well as some KB3 settings. While editing use these buttons to make selections.

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Page 18

Introduction

PC2R

Edit

Edit / Store Group / Menu Compare Copy

Cancel Enter

YesNo

Figure 1-10 Edit section

Select the Edit/Store button to enter the edit mode for the current performance mode to edit programs, setups, etc. To save the changes, press the Edit/Store button again to enter the save dialog. In a performance mode, press the Group/Menu button to select a category of programs or setups. In edit mode, press the Group/Menu button to view the menu of parameters.

When editing, the Compare button lets you hear the difference between an original and a modiﬁed setup or program. The Copy button allows you to copy sections from one setup to another. The Cancel (No) button exits an edit mode or answers no. In a performance mode, the Enter (Yes) button selects a program or setup and answers yes. In an edit mode, press Enter to enter menus for editing.

Modes section—Use the buttons in this section to select one of the three performance modes: Internal Voices, KB3, or MIDI Setups. Three special mode buttons (FX, MIDI Receive, and Global) are also included in this section. The special mode buttons perform as follows: press the FX button to enter the effect edit mode, press the MIDI Receive button to conﬁgure individual

MIDI channels, and press the Global button to select parameters that change the entire PC2R. Many helpful parameters are included in the Global menu such as: the operating system version, available memory, reset, dumping all objects, and MIDIScope.

Modes

Internal Voices MIDI Setups

FX MIDI Receive Global

Figure 1-11 Modes section and LCD Contrast

The Modes section also contains buttons to select the Panic function and Demo mode. These buttons are not individual buttons. They are selected by simultaneously pressing two buttons. To select the Panic function to send an All Notes Off message, simultaneously press the KB3 and the MIDI Setups buttons. To enter the Demo mode, simultaneously press the MIDI Receive and the Global buttons. Flashing LEDs in the Performance section indicate the location of the stored demos.

KB3

Panic

Demo

1-8

LCD Contrast—Rotary potentiometer to adjust the LCD for the best visibility.

Page 19

Chapter 2 Diagnostics

Diagnostic Tests

The following lists the diagnostic tests available for the PC2 Series.

• ROM

• Read-write

• RAM

• MABEL

• LISA

• Sound ROM

• ZRAM

• MIDI

• LED

If a PCX-1 Board is installed, the following tests are also available:

• PCX-1 ROM

• PCX-1 RW

• PCX-1 RAM

• PCX-1 MABEL

• PCX-1 SROM

Warning: Some diagnostic tests erase user programs and setups. If possible, be sure to save all user programs and setups, before entering diagnostics. For instructions, refer to Saving User Data in Chapter 5, page 5-1.

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Page 20

Diagnostics

Entering Diagnostics

1. Apply power to the unit. When the Please wait... message appears in the LCD, quickly press and release the Panic button for PC2 keyboard units or the Edit button for PC2R rack units. The LCD should display the following:

Main menu Install engine

Figure 2-1 LCD example, entering diagnostics

2. Press either the Left or Right cursor button until Run diagnostics appears in the LCD.

3. Press the Enter button.

4. The LCD displays the following:

Main menu Run one test

Figure 2-2 LCD example, diagnostic main menu

5. Press Enter to select the run one test mode. To select the run burn-in test mode, press either the Left or Right cursor button then press the Enter button to begin the tests.

Diagnostic Test Modes

Run One Test

Run One Test allows you to select an individual test, or to step through and run each available test. To step through the different tests, use the Left or Right cursor button. Press the Enter button to select the test.

Select test to run ROM test

2-2

Figure 2-3 LCD example, Run One Test

Page 21

At the completion of a test, whether pass or fail, press the Cancel button to exit the test. Press either the Left of Right cursor button to advance to the next test or another test in the sequence.

At the completion of a test, press the Cancel button to return to the test menu. To exit diagnostics, turn the power off and on to return to normal operation.

Run Burn-in

Burn-in continuously runs the following sequence of tests.

• ROM

• Read-write

• Sound ROM

• ZRAM

• MIDI

If a PCX-1 Board is installed, the sequence of tests is as follows:

• ROM

• Read-write

• MIDI

• PCX-1 ROM

• PCX-1 read

Diagnostics

Test Results

The LCD displays the test results at the completion of each test. To stop the burn-in process and view the test results for each test run, press the Cancel button. Use the Left or Right cursor button to scroll through the results of each test.

To exit Run Burn-in and return to the main menu, press the Cancel button. To exit diagnostics, turn the power off and on to return to normal operation.

Note: If a PCX-1 Board is installed, you must cycle the power after running the SROM or PCX-1 SROM tests. If you do not cycle the power, some tests may not run properly.

Test Results

The top line of the LCD displays the test name to the left and test result to the right. Additional information, if any, is displayed on the bottom line of the LCD.

At the completion of an individual test, the LCD displays the test results. An expected result is Pass, Fail, or Not Run.

If a failure occurs, the LCD displays Fail. To the right of Fail, two characters can be displayed in parenthesis. These characters indicate the type of failure. If the test fails a (t) is displayed. If a hardware error occurs an (H) is displayed.

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Page 22

Diagnostics

Description of Tests

ROM

This test checks the software data (engine, boot, and setups) stored in FlashROM on the Engine Board.

A failure of this test may indicate a problem with the Flash ROM chip (U5 on the Engine Board), associated circuitry, or the Engine Board.

Read-write

This test is a combination of the RAM, MABEL and LISA tests. The Read-write test writes data to RAM and the MABEL and LISA registers then conﬁrms that the data written can be read back successfully.

A failure of this test indicates a problem with the Engine Board.

RAM

The RAM test writes to the microprocessor RAM space and veriﬁes that the write was successful.

A failure of this test may indicate a problem with the RAM or related circuitry on the Engine Board.

MABEL

This test performs a read-write of the MABEL registers and veriﬁes that the data written can be read back successfully.

A failure of this test may indicate a problem with a MABEL, related circuitry or the Engine Board.

LISA

This test conﬁrms that the Lisa chip (U15) is properly installed and successfully interfacing with the microprocessor.

A failure of this test indicates a problem with Lisa, related circuitry or the Engine Board.

Sound ROM

This test conﬁrms that the Sound ROMs can be read by the MABELs by performing a checksum of the Sound ROMs. The computed checksum is then compared to the stored checksum.

A failure of this test may indicate a problem with a Sound ROM (U19 or U20), or the Engine Board.

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Page 23

ZRAM

MIDI

Diagnostics

Description of Tests

This test performs a quick read-write of the internal RAM and veriﬁes that the data was successfully written and retained.

A failure of this test may indicate a problem with the RAM or the Engine Board.

The MIDI test performs a loop-back of the serial port by sending a 23-byte pattern over the external MIDI link. This test requires a MIDI loop (a MIDI cable that connects two MIDI jacks). The test will fail if a MIDI cable is not connected between two MIDI jacks. Be sure to run this test with MIDI cables connected as follows:

Note: Be sure to use a known working MIDI cable!

1. Connect a MIDI cable to the MIDI In and MIDI out jacks and run the test.

2. Connect a MIDI cable to the MIDI In and MIDI Out/Thru jack and set the Out/Thru switch on the rear panel to Out. Run the test.

A failure of this test could be caused by failure of the serial port, other MIDI circuitry, or a problem on the Connector Board or the Engine Board.

LED

This test lights all the front panel LEDs. To complete the test and obtain the test result, press the Cancel button. When the Cancel button is pressed the LEDs shut off and the test result is shown.

A failure of this test may indicate a problem with the Front Panel Board(s), related circuitry or the Connector Board.

PCX-1 ROM

This test checks the software data (engine, boot, and setups) stored in FlashROM on the PCX-1 Board.

Failure of this test may indicate a problem with the Flash ROM chip (U5 on the PCX-1 Board), associated circuitry, or the PCX-1 Board.

PCX-1 RW

This test is a combination of the RAM, MABEL and LISA tests. This test writes data to RAM and the MABEL and LISA registers then conﬁrms that the data written can be read back successfully.

A failure of this test indicates a problem with the PCX-1 Board.

PCX-1 RAM

The PCX-1 RAM test writes to the microprocessor RAM space and veriﬁes that the write was successful.

A failure of this test may indicate a problem with the RAM or related circuitry on the PCX-1 Board.

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Page 24

Diagnostics

Description of Tests

PCX-1 MABEL

PCX-1 SROM

This test performs a read-write of the MABEL registers and veriﬁes that the data written can be read back successfully.

A failure of this test may indicate a problem with a MABEL, associated circuitry or the PCX-1 Board.

The PCX-1 SROM test veriﬁes that the PCX-1 MABELs can read the Sound ROMs by performing a checksum of the Sound ROMs. The computed checksum is then compared to the stored checksum.

A failure of this test indicates a problem with a Sound ROM (U15 or U16) or the PCX-1 Board.

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Page 25

Chapter 3 PC2R Disassembly/Assembly

Introduction

This chapter contains all the procedures for the disassembly and reassembly for the PC2R—as well as instruments with factory-installed or after-market options.

Warning: If possible, save all user programs and setups before disassembly. For instructions, refer to Saving User Data in Chapter 5, page 5-1.

Cables, Connectors

Flat Ribbon Cables

All ﬂat ribbon cables with connectors are keyed, and therefore cannot be reversed. Most ﬂat ribbon cables have locking cable clips. Be sure to reapply the clips when connecting cables. Flat ribbon cables that connect to picoﬂex connectors do not have locking cable clips.

Some ﬂat ribbon cables have exposed wires that insert directly into a wire trap connector. When disconnecting and connecting these cables, you must look for the marking on the edge of the cable denoting Pin 1 and be sure that you match it correctly with Pin 1 on the board.

Cable Routing

In some cases, tape secures cable connections or fastens cables to the bottom enclosure. Always peel back the tape from one side when disconnecting cables so that the tape remains properly positioned.

Required Tools and Materials

• No. 1 Phillips head screwdriver

• No. 2 Phillips head screwdriver

• Small ﬂat screwdriver

• Needle-nose pliers

3-1

Page 26

PC2R Disassembly/Assembly

Opening the PC2R

Removing the Top Cover

Before you begin disassembly, please be sure that the power is off, and that the AC power adapter and all other cables are disconnected.

The top cover is secured to the PC2R with seven screws: three on the top, one on each side, and two on the rear. See Figure 3-1.

Figure 3-1 PC2R top cover

1. Remove the seven screws that secure the top cover.

Figure 3-2 Removing the top cover

2. Refer to Figure 3-2. Slide the top cover back from the Front Panel Assembly to release the top cover from the bottom enclosure, and place the top cover safely aside to avoid damage.

Replacing the Top Cover

1. Place the top cover in position and slide it toward the Front Panel Assembly.

3-2

2. Install the seven screws that secure the top cover. See Figure 3-1.

Page 27

Removing the Connector Board

1. Following Steps 2– 5, disconnect the cables listed in Table 3-1.

Ref. Name Cable Type Destination

J301 PC2 Power stranded wire Engine Board

J302 PC2R Audio In ﬂat ribbon Engine Board

J303 MIDI/CPU ﬂat ribbon Engine Board

J304 Front Panel ﬂat ribbon Right Front Panel Board

J322 FP/Vol/Pwr/Hp stranded wire Headphone/Vol/Pwr Sw Board

Table 3-1 Connector Board cables

2. Disconnect the stranded wire cable from J301 on the Connector Board.

3. Remove the cable locking clip and disconnect the ﬂat ribbon cable from J304. Be sure to set the cable locking clip safely aside so that you can install it when you reconnect the cable.

4. Disconnect the stranded wire cable from J322.

PC2R Disassembly/Assembly

Opening the PC2R

5. The ﬂat ribbon cables connected to J302 and J303 use wire trap connectors. The shielding has been removed from these cables to expose the wires. The wires are directly inserted into these connectors.

Lift up the sides of each connector. This unlocks the trap to free the cable wires. Gently pull each cable up out of the connector. Note the marking (red or black) on each cable that indicates the connection to Pin 1; you’ll need to reconnect the marked edge of the cable to Pin 1 when you replace the Connector Board.

6. Remove the two screws that secure the MIDI jacks to the rear panel.

7. Remove the two nuts that secure the 1/4” audio out jacks to the rear panel.

8. Remove the three screws that secure the Connector Board to the bottom enclosure.

Caution: VR1 on the Connector Board is attached to the heat sink. When you remove the Connector Board and heat sink, be sure to keep the board and heat sink stable so that you do not damage VR1 or its connection.

9. Remove the four screws that secure the heat sink to the bottom enclosure.

10. Slide the Connector Board and heat sink away from the rear panel and toward the Front Panel Assembly. This will free the jacks and MIDI switch from their positions on the rear panel.

11.Tilt up the rear panel edge of the Connector Board and heat sink. Carefully lift the board and heat sink out of the PC2R, and place them on a ﬂat protected surface.

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Page 28

PC2R Disassembly/Assembly

Opening the PC2R

Replacing the Connector Board

1. Tilt down the inner edge (closest to the Front Panel Assembly) of the Connector Board and heat sink, and place it ﬂat on to the bottom enclosure.

2. Slide the Connector Board and heat sink toward the rear panel so that the jacks and MIDI switch are positioned through their openings in the rear panel.

3. Install the four screws that secure the heat sink to the bottom enclosure.

4. Install the three screws that secure the Connector Board to the bottom enclosure.

5. Install the two screws that secure the MIDI jacks to the rear panel.

6. Install the two nuts that secure the 1/4” audio out jacks to the rear panel.

7. Connect the wire trap ﬂat ribbon cables in the following order.

Caution: Be sure to look for the marking on the edge of the cable denoting Pin 1 and that you match it correctly with Pin 1 on the board. Make certain that the wires are straight prior to inserting them into the connector and that each wire is correctly inserted into its respective position.

Note: Be sure the sides of the connector are lifted. Insert the ﬂat ribbon cables into the wire trap connectors and push down the sides of each connector to lock the cable into the connector. Gently pull each cable to verify that it is locked into its connector.

Insert the ﬁve-wire ﬂat ribbon cable from the Engine Board into the wire trap connector at J302 on the Connector Board.

Insert the ten-wire ﬂat ribbon cable from the Engine Board into the wire trap connector at J303 on the Connector Board.

8. Connect the stranded wire cable from the Headphone/Volume/Power Switch Board to J322.

9. Connect the ﬂat ribbon cable from the Right Front Panel Board to J304. Be sure to install the cable locking clip.

10. Connect the stranded wire cable from the Engine Board to J301.

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Page 29

PC2R Disassembly/Assembly

Removing the Polyphony Expansion Board (PCX-1)

The Polyphony Expansion Board is mounted onto the Engine Board and held in place with four nylon PC board standoffs and a 24-pin female connector on the underside of the board. It is also secured to the bottom enclosure with two screws.

1. Remove the two screws that secure the PCX-1 Board to the bottom enclosure.

2. Squeeze the top of one of the four nylon PC board standoffs, and lift the corner of the board until it clears that standoff. Repeat for the other three standoffs.

3. When the board is free of the standoffs, lift the board straight up to disconnect the 24-pin connector from the Engine Board.

24-pin female connector on PCX-1 board

Opening the PC2R

24-pin male header on Engine board

Figure 3-3 Removing the Polyphony Expansion Board (PCX-1)

Replacing the Polyphony Expansion Board (PCX-1)

There are two cables routed underneath the PCX-1 Board: a ﬂat ribbon cable from the LCD to the Engine Board, and a stranded wire cable from the Headphone/Volume/Power Switch Board to the Connector Board. Before you replace the PCX-1 Board, be certain that these cables are properly positioned.

1. Place the PCX-1 Board over the four standoffs. This should properly position the 24-pin connector over the 24-pin header on the Engine Board.

2. Press the PCX-1 Board down, securing the 24-pin connector, and snapping the board onto the standoffs.

Note: If you are installing a new PCX-1 Board, check the old board for Sound ROM options. If the unit has Sound ROM options, be sure to install them on the new board.

3. Install the two screws that secure the PCX-1 Board to the bottom enclosure.

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Page 30

PC2R Disassembly/Assembly

Opening the PC2R

Removing the Engine Board

1. If the PC2R you are servicing has a PCX-1 Board installed, remove it following the procedure described on page 3-5.

2. Following Steps 3–6, disconnect the cables listed in Table 3-2.

Ref. Name Cable Type Destination

J304 Front Panel ﬂat ribbon RIght Front Panel to Connector

J402 PC2 Power stranded wire Connector Board

J403 MIDI/CPU ﬂat ribbon Connector Board

J405 Backlight stranded wire LCD Board

J406 LCD ﬂat ribbon LCD Board

J412 PC2 Audio Out ﬂat ribbon Connector Board

Table 3-2 Engine Board cables

3. Remove the cable locking clip and disconnect the ﬂat ribbon cable from J304 on the Connector Board. Be sure to set the cable locking clip safely aside so that you can install it when you reconnect the cable.

4. The ﬂat ribbon cables connected to J403 and J412 use wire trap connectors. The shielding has been removed from these cables to expose the wires. The wires are directly inserted into these connectors.

5. Remove the cable locking clip and disconnect the ﬂat ribbon cable from location J406 on the Engine Board. Be sure to set the cable locking clip safely aside so that you can install it when you reconnect the cable.

6. Disconnect the stranded wire cables from locations J402 and J405 on the Engine Board.

7. Remove the ﬁve screws that secure the Engine Board to the bottom enclosure and remove the Engine Board.

Replacing the Engine Board

1. Place the Engine Board on the bottom enclosure.

2. Install the ﬁve screws that secure the Engine Board to the bottom enclosure.

3. Connect the stranded wire cable from the Connector Board to J402.

4. Connect the stranded wire cable from the LCD Board to J405.

3-6

5. Connect the ﬂat ribbon cable from the LCD Board to J406. Be sure to install the cable locking clip.

6. Connect the wire trap ﬂat ribbon cables in the following order.

Page 31

PC2R Disassembly/Assembly

Opening the PC2R

Insert the ﬁve-wire ﬂat ribbon cable from the Connector Board into the wire trap connector at J412 on the Engine Board.

Insert the ten-wire ﬂat ribbon cable from the Connector Board into the wire trap connector at J403 on the Engine Board.

7. Connect the ﬂat ribbon cable from the Right Front Panel Board to J304 on the Connector Board. Be sure to install the cable locking clip.

8. If you removed a PCX-1 Board, install it following the procedure on page 3-5.

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Page 32

PC2R Disassembly/Assembly

Front Panel Assembly

The Front Panel Assembly consists of the front panel faceplate, a mounting bracket for the front panel boards, and four printed circuit boards. The boards mounted on the Front Panel Assembly are the Right Front Panel, LCD, Left Front Panel, and Headphone/Volume/Power Switch.

Removing the Front Panel Assembly

Refer to Figure 3-4. The bottom edge of the Front Panel Assembly and front edge of the bottom enclosure connect to form a lip.

Lip

Figure 3-4 Front Panel Assembly and bottom enclosure

1. Tilt up the front edge of the PC2R.

2. Using a #1 screwdriver, remove the four screws that secure the Front Panel Assembly to the bottom enclosure.

Note: Before continuing, be sure that you have a soft surface to rest the Front Panel Assembly on so that the front panel switches, jacks, and rotary potentiometers are not damaged.

3. Slide the Front Panel Assembly forward and away from the bottom enclosure.

Caution: There are four cables connected to the Front Panel Assembly. You do not need to disconnect these cables.

Replacing the Front Panel Assembly

1. Position the Front Panel Assembly so that its bottom edge is under the front edge of the bottom enclosure.

3-8

2. Tilt up the front edge of the PC2R and install the four black ﬂat head machine screws.

Page 33

Removing the Front Panel Faceplate

Note: If the service you are performing only requires that you have access to the front panel boards for component testing, component replacement or installing a replacement board, it is not necessary to remove the front panel faceplate. Refer to the procedure for the front panel board you need to remove and follow the steps described.

1. Follow the procedure to remove the Front Panel Assembly.

2. Refer to Figure 3-5 on page 3-10. Four ﬂat head machine screws secure the front panel faceplate to the Front Panel Assembly. These screws are located along the top of the Front Panel Assembly.

Using a #1 screwdriver, remove the four screws.

3. Place the front panel faceplate safely aside to avoid accidental damage.

Replacing the Front Panel Faceplate

1. Position the front panel faceplate onto the Front Panel Assembly.

PC2R Disassembly/Assembly

Front Panel Assembly

Note: Verify that the rotary potentiometers, jacks, and switch button caps are correctly positioned through their openings in the front panel faceplate. Turn the rotary potentiometers to be sure that they move freely; and push the switch button caps to be sure that their corresponding switches click.

2. Install the four ﬂat head machine screws that secure the front panel faceplate to the Front Panel Assembly.

Front Panel Boards

The front panel boards are secured to a mounting bracket. This bracket is secured to the front panel faceplate.

If the service you are performing only requires that you have access to the front panel boards for component testing, component replacement or installing a replacement board, it is not necessary to remove the front panel faceplate or remove the boards from the mounting bracket.

Figure 3-5 shows the position of the boards on the Front Panel Assembly and the placement of the front panel faceplate screws located above the boards. Refer to the procedure for the front panel board you need to remove and follow the steps described.

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Page 34

PC2R Disassembly/Assembly

Front Panel Assembly

Figure 3-5 Front panel faceplate screw locations

faceplate screws

Headphone/Volume

Power Switch Board

Left Front

Panel Board

LCD

Board

Right Front

Panel Board

Removing the Right Front Panel Board

1. Remove the Front Panel Assembly, as described on page 3-8. It is not necessary to disconnect all the cables that connect the Front Panel Assembly boards to boards located on the bottom enclosure.

2. Remove the cable locking clip and disconnect the ﬂat ribbon cable from J601 on the Right Front Panel Board.

3. Disconnect the ﬂat ribbon cable from J602. This cable uses a picoﬂex molex connector. To disconnect it, grip the connector and pull it out straight.

Caution: Do not wiggle the connector back and forth. Doing so, could cause damage to the header.

Note: Be aware of the marking (red or black) on the cable that indicates the connection to Pin 1; you’ll need to reconnect the marked edge of the cable to Pin 1 when you replace the board.

4. It is not necessary to remove the front panel faceplate to remove the Right Front Panel Board. Two of the screws that secure the front panel faceplate to the Front Panel Assembly are located above the Right Front Panel Board. Refer to Figure 3-5 and remove the two screws.

5. Remove the three screws that secure the Right Front Panel Board to the mounting bracket, and remove the Right Front Panel Board.

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Page 35

Replacing the Right Front Panel Board

1. Place the Right Front Panel Board in position on the mounting bracket and line up the screw holes.

Note: Verify that the rotary potentiometers and switch button caps are correctly positioned through their openings in the front panel faceplate. Turn the rotary potentiometers to be sure that they move freely; and push the switch button caps to be sure that their corresponding switches click.

2. Install the three screws that secure the board to the mounting bracket.

3. Install the two screws that secure the front panel faceplate.

4. Connect the ﬂat ribbon cable from the Connector Board to Right Front Panel Board, location J601. Be sure to install the cable locking clip.

5. Connect the ﬂat ribbon cable from the Left Front Panel Board to the Right Front Panel Board, location J602.

Caution: The side walls of the picoﬂex header are different. The Pin 1 side is slightly wider than the other side; and the corresponding sides of the connector incorporate the differences. When you connect the cable, be sure to orient the marking (red or black) on the cable that indicates the connection to Pin 1 on the board to prevent damage to the header or a failure caused by an improper connection.

PC2R Disassembly/Assembly

Front Panel Assembly

6. Follow the procedure on page 3-8 to install the Front Panel Assembly.

Removing the LCD Board

1. Remove the Front Panel Assembly, as described on page 3-8. It is not necessary to disconnect all the cables that connect the Front Panel Assembly boards to boards located on the bottom enclosure.

2. Disconnect the stranded wire cable soldered to the LCD Board from location J405 on the Engine Board.

3. Remove the locking cable clip and disconnect the ﬂat ribbon cable soldered to the LCD Board from location J406 on the Engine Board. If the unit you are servicing has a PCX-1 Board installed, this cable is routed underneath the PCX-1 Board.

After you disconnect the cable, carefully slide it so that it is positioned close to the left edge of the PCX-1 Board (left edge as viewed standing at the front panel). Gently pull the cable toward the Front Panel Assembly to completely free it from underneath the PCX-1 Board.

4. It is not necessary to remove the front panel faceplate to remove the LCD Board. One screw that secures the faceplate to the Front Panel Assembly is located above the LCD Board. Refer to Figure 3-5 and remove the screw.

5. Remove the two screws that secure the LCD Board to the mounting bracket, and remove the LCD.

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PC2R Disassembly/Assembly

Front Panel Assembly

Replacing the LCD Board

1. Place the LCD Board in position over the mounting standoffs on the mounting bracket.

2. Install the two screws that secure the LCD Board to the mounting bracket.

3. Install the screw that secures the front panel faceplate to the Front Panel Assembly.

4. Connect the stranded wire cable from the LCD Board to location J405 on the Engine Board.

5. If the unit you are servicing has a PCX-1 Board installed, route the ﬂat ribbon cable beneath the board and connect it to location J406 on the Engine Board. Be sure to install the cable locking clip.

6. Follow the procedure on page 3-8 to install the Front Panel Assembly.

Removing the Left Front Panel Board

1. Remove the Front Panel Assembly, as described on page 3-8. It is not necessary to disconnect all the cables that connect the Front Panel Assembly boards to boards located on the bottom enclosure.

2. Disconnect the ﬂat ribbon cable from J603. This cable uses a picoﬂex molex connector. To disconnect it, grip the connector and pull it out straight.

Caution: Do not wiggle the connector back and forth. Doing so, could cause damage to the header.

Note: Be aware of the marking (red or black) on the cable that indicates the connection to Pin 1; you’ll need to reconnect the marked edge of the cable to Pin 1 when you replace the board.

3. It is not necessary to remove the front panel faceplate to remove the Left Front Panel Board. One screw that secures the front panel faceplate to the Front Panel Assembly is located above the Left Front Panel Board. Refer to Figure 3-5 and remove the screw.

4. Remove the two screws that secure the Left Front Panel Board to the mounting bracket.

5. Refer to Figure 3-6. This illustration shows the location of a soldered connection between the Left Front Panel and Headphone/Volume/Power Switch Boards. To remove the board, desolder this connection from the Left Front Panel Board.

Note: This illustration shows the Headphone/Volume/Power Switch Board lying ﬂat to indicate the connection between it and the Left Front Panel Board. In its normal position, it is perpendicular to the Left Front Panel Board.

3-12

Page 37

PC2R Disassembly/Assembly

Front Panel Assembly

Left Front Panel Board

J603

Circuit side

J604

connection

soldered

Figure 3-6 Left Front Panel and Headphone/Volume/Power Switch Board

connection

6. Remove the Left Front Panel Board.

Replacing the Left Front Panel Board

1. Place the Left Front Panel Board in position on the mounting bracket and line up the screw holes.

2. Install the two screws that secure the board to the mounting bracket.

HP/Vol/Pwr Sw

Board

3. Install the screw that secures the front panel faceplate.

4. Connect the ﬂat ribbon cable from the Right Front Panel Board to the Left Front Panel Board, location J603.

5. Refer to Figure 3-6. Solder the wire connection from the Headphone/Volume/Power Switch Board to the location indicated on the Left Front Panel Board.

6. Follow the procedure on page 3-8 to install the Front Panel Assembly.

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PC2R Disassembly/Assembly

Front Panel Assembly

Removing the Headphone/Volume/Power Switch Board

1. Remove the Front Panel Assembly, as described on page 3-8. It is not necessary to disconnect all the cables that connect the Front Panel Assembly boards to boards located on the bottom enclosure.

2. Follow the procedure on page 3-9 to remove the front panel faceplate.

3. Disconnect the stranded wire cable that connects the Headphone/Volume/Power Switch Board to the Connector Board.

4. Remove the nut and ﬂat washer that secure the headphone jack to the front panel mounting plate.

5. Remove the volume knob.

6. Remove the nut and ﬂat washer that secure the volume/power switch to the front panel mounting plate.

7. Refer to Figure 3-6. This illustration shows the location of a soldered connection between the Left Front Panel and Headphone/Volume/Power Switch Boards. To remove the board, desolder this connection from the Headphone/Volume/Power Switch Board.

8. Remove the Headphone/Volume/Power Switch Board.

Replacing the Headphone/Volume/Power Switch Board

1. Position the Headphone/Volume/Power Switch Board on the mounting bracket.

2. Install the nut and washer that secure the headphone jack to the mounting bracket.

3. Install the nut and washer that secure the volume/power switch to the mounting bracket.

4. Install the volume knob.

5. Refer to Figure 3-6. Solder the wire connection from the Left Front Panel Board to Pin 5 of J2 on the Headphone/Volume/Power Switch Board.

6. Follow the procedure on page 3-9 to install the front panel faceplate.

Note: Be sure that the Volume/Power Switch moves freely.

7. Follow the procedure on page 3-8 to install the Front Panel Assembly.

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Chapter 4 PC2/PC2X Disassembly/Assembly

Introduction

This chapter contains all the procedures for the disassembly and reassembly of both the 76-note PC2 and the 88-note PC2X—as well as instruments with factory-installed or after-market options. There are ﬁve main sections: Opening the PC2/PC2X, Top Enclosure, PC2 Keyboard Assembly, and PC2X Keyboard Assembly.

Warning: If possible, save all user programs and setups before disassembly. For instructions, refer to Saving User Data in Chapter 5, page 5-1.

Notes, Cautions, Warnings

Please pay special attention to all Notes, Cautions, and Warnings as they not only point out speciﬁc instructions, but also alert you to differences between the 76-note PC2 keyboard and the 88-note PC2X keyboard.

Cables, Connectors

Flat Ribbon Cables

All ﬂat ribbon cables with connectors are keyed, and therefore cannot be reversed. Most ﬂat ribbon cables have locking cable clips. Be sure to reapply the clips when connecting cables.

Cable Routing

Required Tools and Materials

• No. 1 Phillips head screwdriver

• No. 2 Phillips head screwdriver

• Small ﬂat screwdriver

• Dowel (3mm diameter)

• Needle-nose pliers

• Small blunt-end tool (Q-Tip, toothpick, etc.)

• Foam blocks

4-1

Page 40

PC2/PC2X Disassembly/Assembly

Opening the PC2/PC2X

PC2 Bottom

Refer to Figure 4-1. Arrows indicate the locations of the enclosure support wall, endcap and rear panel screws.

Keyboard

Endcap screws

Enclosure support wall screws

Access panel

* *

Endcap screws

Rear panel

*Endcap locking bracket screws

Figure 4-1 PC2 bottom enclosure

Caution: Do not remove the endcap or rear panel screws at this point of the procedure.

1. Tilt the PC2 up and remove the eight enclosure support wall screws.

2. Place the unit ﬂat on your work surface.

3. Move the unit so that the rear panel portion of the unit hangs over the edge of your work surface. This gives you access to the seven screws that secure the rear panel portion of the top enclosure to the bottom enclosure. Remove the seven screws.

Note: Two of the rear panel screws also secure the rear panel portion of the access panel. It is not necessary to remove the ﬁve remaining access panel screws.

4. Slide the unit back onto the work surface.

Rear panel screws

4-2

Page 41

PC2X Bottom

Refer to Figure 4-2. Arrows indicate the locations of the enclosure support wall, endcap and rear panel screws.

Keyboard

Endcap screws

PC2/PC2X Disassembly/Assembly

Opening the PC2/PC2X

Enclosure support wall screws

Rear panel

*Endcap locking bracket screws

1. Tilt the PC2X up and remove the eight enclosure support wall screws.

2. Place the unit ﬂat on your work surface.

3. Move the unit so that the rear panel portion of the unit hangs over the edge of your work

Access panel

Endcap screws

Rear panel screws

Figure 4-2 PC2X bottom enclosure

Caution: Do not remove the endcap or rear panel screws at this point of the procedure.

surface. This gives you access to the nine screws that secure the rear panel portion of the top enclosure to the bottom enclosure. Remove the nine screws.

Note: Two of the rear panel screws also secure the rear panel edge of the access panel. It is not necessary to remove the ﬁve remaining access panel screws.

4. Slide the unit back onto the work surface.

4-3

Page 42

PC2/PC2X Disassembly/Assembly

Opening the PC2/PC2X

Removing the Top Enclosure

1. Depending on the unit you are servicing, follow the procedures described on page 4-2 for the PC2 bottom or page 4-3 for the PC2X bottom.

2. Refer to Figure 4-3.

Note: Figure 4-3 is an illustration of the PC2 rear panel. An illustration of the PC2X has not been included because the difference between the two is minimal. The quantity and position of the endcap screws is identical.

3. Remove the four screws that secure the endcaps to the rear panel.

Endcap screws

Power MIDI Pedals Inputs Audio Outs

I / 0

Adapter In

Thru / Out

9.0V 2.0A

14.0V~0.25A

Digital

Switch

Continuous

Breath

Out

Thru / Out

LCD

Contrast

132

2 Right

Ribbon

Left Headphones

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.

Manufacturer: Young Chang Co., LTD. Made in ROK Serial No.

PC2

Endcap screws

Figure 4-3 PC2 rear panel

Caution: The following steps describe removing the left and right endcaps. To avoid damage to the endcaps, be sure to hold onto each endcap when removing the screws. When the endcap screws are removed, the endcap is free of the unit.

4. Refer to Figure 4-1 for the PC2 or Figure 4-2 for the PC2X. Move the unit so that one end hangs over the edge of your work surface. Remove the four endcap screws from the bottom enclosure. One of these screws secures the endcap locking bracket. When you remove the endcap locking bracket screw, the bracket remains loosely in the endcap assembly. Set the endcap safely aside. Repeat for the other endcap.

5. Refer to Figure 4-4. The bottom edge of the rear panel and back edge of the bottom enclosure connect to form a lip. The rear panel screws secure the lip.

Note: Figure 4-4 is an illustration of the PC2. An illustration of the PC2X has not been included because the difference between the two is minimal. The only difference is the spacing and quantity of the rear panel screws. If you are servicing a PC2, there are seven screws securing the rear panel portion of the top enclosure to the bottom enclosure. If you are servicing a PC2X, there are nine screws.

4-4

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Lip

PC2/PC2X Disassembly/Assembly

Opening the PC2/PC2X

Rear panel screw locations

Figure 4-4 Top cover and bottom enclosure

Warning: Be sure to have your work surface prepared. This includes placing foam blocks behind the unit. When the top enclosure is removed, place it on the foam blocks to avoid damaging the Alpha Wheel, control panel buttons, and sliders. The following procedure requires enough room behind the rear of the unit to place the top enclosure face down on your work surface.

6. Grip each end of the top enclosure and rotate it back approximately two inches. This separates the bottom edges of the top enclosure and bottom enclosure.

7. Lift the top enclosure straight up.

8. Turn the top enclosure over and place it face down onto your work surface.

Caution: Table 4-1 lists the cables, by board location, from the top enclosure to the assembly they connect to on the bottom enclosure. You do not need to disconnect these cables.

Top cover Assembly Bottom Enclosure

Connector Board Keyboard Assembly

FP Board Button Board/Wheel Assembly

Connector Board Mod Wheel Assembly

Table 4-1 Top cover and bottom enclosure cables

4-5

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PC2/PC2X Disassembly/Assembly

Opening the PC2/PC2X

Replacing the Top Enclosure

1. Position the top enclosure behind the bottom enclosure.

2. Move the top enclosure so that the bottom edge of the rear panel is positioned under the bottom enclosure edge. See Figure 4-4 on page 4-5.

Note: Verify that the cables listed in Table 4-1 are lying ﬂat on the bottom enclosure. Be sure that all other cables are tucked between the top enclosure and the enclosure support walls.

3. Hold the top enclosure safely in place and move the unit so that one end of the rear panel edge hangs over the edge of your work surface and install the rear panel screw at that end. Slide the unit back onto your work surface. Repeat for other end. Refer to Figure 4-1 for the PC2 or Figure 4-2 for the PC2X.

Warning: Perform Steps 3 and 4 separately. Combining these steps could cause the top enclosure to ﬂip away from the bottom enclosure or off of your work surface.

4. Move the unit so that the rear panel edge of the unit hangs over the edge of your work surface and install the remaining screws.

Note: If you are servicing a PC2, there are ﬁve remaining rear panel screws to install. If you are servicing a PC2X, there are seven remaining screws.

Closing the PC2/PC2X

Warning: The following procedure assumes that you have completed Steps 3 and 4 in

Replacing the Top Enclosure. If you have not completed these steps, do so before continuing.

1. Refer to Figure 4-1 for the PC2 or Figure 4-2 for the PC2X. Tilt the unit up and install the eight enclosure support wall screws.

2. Slide one side of the unit off of your work surface and hold the appropriate endcap in position. Install the four endcap screws in the bottom enclosure. Repeat for the other endcap.

3. Refer to Figure 4-3. Install the four endcap screws in the rear panel.

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Page 45

Top Enclosure

The top enclosure includes ﬁve boards: Connector, Front Panel, LCD, Slider, and Engine. The Right and Left Enclosure Support Walls are also included on the top enclosure. Figure 4-5 shows the placement of the enclosure support walls. Figure 4-6 shows the placement of the boards.

PC2/PC2X Disassembly/Assembly

Top Enclosure

Left Enclosure Support Wall

Right Enclosure Support Wall

Figure 4-5 Top enclosure, enclosure support walls

LCD Board

Front Panel Board

Connector Board

Figure 4-6 Top enclosure, board locations

Engine Board

Slider Board

4-7

Page 46

PC2/PC2X Disassembly/Assembly

Top Enclosure

Removing the Enclosure Support Walls

Left Enclosure Support Wall

1. Remove the four screws that secure the left enclosure support wall to the top enclosure, and remove the left enclosure support wall.

Right Enclosure Support Wall

1. Remove the six screws that secure the right enclosure support wall to the top enclosure, and remove the right enclosure support wall.

Replacing the Enclosure Support Walls

Left Enclosure Support Wall

1. Align the center screw holes of the three-hole groupings in the left enclosure support wall with the thread marks in the extrusion.

2. Install the four screws that secure the left enclosure support wall to the top enclosure.

Right Enclosure Support Wall

1. Align the center screw holes of the three-hole groupings in the right enclosure support wall with the thread marks in the extrusion.

2. Install the six screws that secure the right enclosure support wall to the top enclosure.

Removing the Connector Board

1. Follow the procedure described on page 4-8 to remove the right enclosure support wall.

2. Following Steps 3–5, disconnect the cables listed in Table 4-2.

Ref. Name Cable Type Destination

J301 PC2 Power stranded wire Engine Board

J302 Audio ﬂat ribbon Engine Board

J303 MIDI/CPU ﬂat ribbon Engine Board

J304 Front Panel ﬂat ribbon Front Panel Board

J305 Slider ﬂat ribbon Slider Board

J306 Treble ﬂat ribbon Keyboard Assembly

J307 Bass ﬂat ribbon Keyboard Assembly

J308 Wheels ﬂat ribbon Mod Wheel Assembly

4-8

Table 4-2 Connector Board cables

3. Disconnect the stranded wire cable from J301 on the Connector Board.

Page 47

PC2/PC2X Disassembly/Assembly

Top Enclosure

4. Remove the cable locking clips and disconnect the ﬂat ribbon cables from J304, J306, and J307. Be sure to set the cable locking clips safely aside so that you can install them when you reconnect the cables.

Note: The cables used throughout the PC2/PC2X are bundled and routed so that their locations and destinations seem obvious. However, to avoid reversing the Bass and Treble cables when reconnecting, mark one or both cables designating B for Bass and T for Treble.

5. The ﬂat ribbon cables connected to J302, J303, J305, and J308 use wire trap connectors. The shielding has been removed from the end of these cables to expose the wires. The wires are directly inserted into these connectors.

6. Remove the ﬁve screws that secure the Connector Board to the rear panel. Two of these screws are longer than the others and have spacers located between the screw and the rear panel. See Figure 4-7 for the locations of the screws and spacers.

Note: Do not remove any other hardware from this portion of the rear panel.

Power MIDI Pedals Inputs Audio Outs

I / 0

Adapter In

9.0V 2.0A

14.0V~0.25A

Thru / Out

MIDI jack screws

Thru / Out

Out

LCD

Contrast

Digital

Out

Switch

Continuous

132

Breath

2 Right

Ribbon

Left Headphones

longer screws with spacers

Figure 4-7 Rear panel hardware locations

7. Remove the two screws that secure the MIDI jacks to the rear panel. See Figure 4-7.

8. Remove the Connector Board.

4-9

Page 48

PC2/PC2X Disassembly/Assembly

Top Enclosure

Replacing the Connector Board

1. Hold the Connector Board and position it so that the power switch, LCD Contrast potentiometer, and the rear panel jacks are correctly positioned through the rear panel portion of the top enclosure.

2. Install the two screws that secure the MIDI jacks to the rear panel. See Figure 4-7.

3. Install the ﬁve screws that secure the Connector Board to the rear panel. Be sure to place a spacer and use one of the longer screws at the locations noted in Figure 4-7.

4. Connect the wire trap ﬂat ribbon cables in the following order.

Insert the ﬁve-wire ﬂat ribbon cable from the Engine Board into the wire trap connector at J302 on the Connector Board.

Insert the seven-wire ﬂat ribbon cable from the Slider Board into the wire trap connector at J305 on the Connector Board.

Insert the six-wire ﬂat ribbon cable from the Mod Wheel Assembly into the wire trap connector at J308 on the Connector Board.

Insert the ten-wire ﬂat ribbon cable from the Engine Board into the wire trap connector at J303 on the Connector Board.

5. Connect the ﬂat ribbon cables from the Keyboard Assembly to J306 and J307. Be sure to install a cable locking clip on each connector.

6. Connect the ﬂat ribbon cable from the Front Panel Board to J304 on the Connector Board. Be sure to install a cable locking clip on the connector.

7. Connect the stranded wire cable from the Engine Board to J301 on the Connector Board.

8. Follow the procedure on page 4-8 to install the right enclosure support wall.

Removing the Front Panel Board

1. Follow the procedure described on page 4-8 to remove the right enclosure support wall.

2. Follow the procedure described on page 4-8 to remove the Connector Board.

4-10

3. Following Steps 4 and 5, disconnect the cables listed in Table 4-3.

Page 49

PC2/PC2X Disassembly/Assembly

Top Enclosure

Ref. Name Cable Type Destination

J601 IBBB ﬂat ribbon Button Board/Wheel Assembly

J602 FP Bridge ﬂat ribbon Slider Board

Table 4-3 Front Panel Board cables

4. The ﬂat ribbon cables connected to J601 and J602 use wire trap connectors. The shielding has been removed from the end of these cables to expose the wires. The wires are directly inserted into these connectors.

5. Remove the cable locking clip and disconnect the ﬂat ribbon cable at J604 on the Front Panel Board. Be sure to set the cable locking clip safely aside so that you can install it when you reconnect the cable.

Note: The ﬂat ribbon cable at location J604 was disconnected following the procedure to remove the Connector Board. It is not necessary to disconnect it from the Front Panel Board. However, if you are replacing the Front Panel Board with a replacement board, be sure to disconnect the cable and connect it to the replacement board.

6. Five of the screws that secure the right enclosure support wall also secure the front panel edge of the Front Panel Board. You have already removed the enclosure support wall, but two screws remain securing this edge of the board. See Figure 4-8, and remove the two remaining screws.

PC board clamps and screws

J601

J604

Front panel edge screws

J602

Figure 4-8 Front Panel Board, screw locations

7. Remove the six screws that secure the three PC board clamps (two screws per clamp). These screws also secure the rear panel edge of the Front Panel Board.

4-11

Page 50

PC2/PC2X Disassembly/Assembly

Top Enclosure

The LCD is mounted onto a bezel that is secured to the Front Panel Board with small pegs that snap into holes on the Front Panel Board. Removing the LCD requires cutting the tie wraps that bundle the LCD cables to cable mounts positioned along the rear panel. It is not necessary to remove the LCD from the unit. Remove the four screws that secure the LCD to the front panel bezel. Lift the LCD up from the bezel and fold it over so that the circuit side of the LCD is positioned above the Slider Board. For protection, place a piece of anti-static material between the LCD and Slider Boards.

8. Lift the Front Panel Board up from the top enclosure. The spinknob and switch button caps should remain in place.

Caution: Each switch button cap uses a set of small pegs to mount the cap to the Front Panel Board. The button caps are mounted individually or in clusters. If a cap becomes separated from the board, be careful that a peg is not inadvertently broken.

Replacing the Front Panel Board

1. Position the Front Panel Board onto the top enclosure, then raise the top enclosure up slightly to verify that the spinknob and switch button caps are correctly positioned through their openings in the top enclosure.

2. Align the center screw holes of the three-hole groupings on the front panel edge of the board with the thread marks in the extrusion and install the two screws that secure the front panel edge. See Figure 4-8.

3. Place a PC board clamp in position. Align the center screw holes of the clamp with the thread marks in the extrusion and install the two screws that secure the clamp. Repeat for the other two clamps.

4. Position the LCD onto the front panel bezel and install the four screws that secure it to the bezel.

5. Connect the wire trap ﬂat ribbon cables in the following order.

Insert the ﬁve-wire ﬂat ribbon cable from the Button Board into the wire trap connector at J601 on the Front Panel Board.

Insert the eight-wire ﬂat ribbon cable from the Slider Board into the wire trap connector at J602 on the Front Panel Board.

6. If you have disconnected the ﬂat ribbon cable from J604, reconnect it. Be sure to install the cable locking clip.

4-12

7. Follow the procedure on page 4-10 to install the Connector Board.

8. Follow the procedure on page 4-8 to install the right enclosure support wall.

Page 51

Removing the LCD Board

1. Follow the procedure described on page 4-8 to remove the right enclosure support wall.

2. Disconnect the stranded wire from location J405 on the Engine Board.

3. Remove the cable locking clip and disconnect the ﬂat ribbon cable from J406 on the Engine Board. Be sure to set the cable locking clip safely aside so that you can install it when you reconnect the cable.

4. Removing the LCD Board requires cutting the tie wraps that bundle the LCD cables to cable mounts positioned along the rear panel. Cut the tie wraps at the cable mounts that the two LCD cables pass through.

5. Remove the four screws that secure the LCD to the front panel bezel.

6. Lift the LCD Board up and remove it.

Caution: Be sure that the LCD cables are not tangled with other cables routed along the rear panel.

Replacing the LCD Board

1. Place the LCD Board in position face down onto the front panel bezel.

PC2/PC2X Disassembly/Assembly

Top Enclosure

2. Install the four screws that secure it to the front panel bezel.

3. Connect the stranded wire cable to J405 on the Engine Board.

4. Connect the ﬂat ribbon cable to J406 on the Engine Board. Be sure to install the cable locking clip.

5. Position the LCD cables at the cable mounts on the rear panel and install new tie wraps through the cable mounts to bundle the cables.

Caution: Be sure that you have bundled the LCD cables with the other cables positioned at the cable mounts.

6. Follow the procedure on page 4-8 to install the right enclosure support wall.

Removing the Polyphony Expansion Board (PCX-1)

The Polyphony Expansion Board is mounted on to the Engine Board and held in place with four nylon PC board standoffs and a 24-pin female header on the underside of the board.

1. Follow the procedure described on page 4-8 to remove the left enclosure support wall.

2. Squeeze the top of one of the four nylon PC board standoffs, and lift the corner of the board until it clears that standoff. Repeat for the other three standoffs.

3. When the board is free of the standoffs, lift the board straight up to disconnect the 24-pin connector from the Engine Board.

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Page 52

PC2/PC2X Disassembly/Assembly

Top Enclosure

Replacing the Polyphony Expansion Board (PCX-1)

1. Place the PCX-1 Board over the four standoffs. This should properly position the 24-pin connector over the 24-pin header on the Engine Board.

2. Press the PCX-1 Board down, securing the 24-pin connector, and snapping the board onto the standoffs.

Note: If you are installing a new PCX-1 Board, check the old board for Sound ROM options. If the unit has Sound ROM options, be sure to install them on the new board.

3. Follow the procedure described on page 4-8 to install the left enclosure support wall.

Removing the Slider Board

1. Follow the procedure described on page 4-8 to remove the left enclosure support wall.

2. If the unit you are servicing has a PCX-1 Board installed, follow the procedure on page 4-13 to remove it.

3. The ﬂat ribbon cables connected to J101 and J102 use wire trap connectors. The shielding has been removed from the end of these cables to expose the wires. The wires are inserted directly into these connectors.

4. Two of the screws that secure the left enclosure support wall also secure the front panel edge of the Slider Board. You have already removed the enclosure support wall, but one screw remains securing this edge of the board. See Figure 4-9, and remove the remaining screw.

PC board clamp and screws

J101

J102

Front panel edge screw

Figure 4-9 Slider Board, screw locations

4-14

5. Remove the two screws that secure the PC board clamp and rear panel edge of the Slider Board to the top enclosure.

6. Remove the Slider Board. The slider knobs, slider bezels, and switch button caps should remain in place.

Page 53

Caution: Each switch button cap uses a set of small pegs to mount the cap to the Slider Board. The button caps are mounted individually or in clusters. If a cap becomes separated from the board, be careful that a peg is not inadvertently broken.

Replacing the Slider Board

1. Position the Slider Board onto the top enclosure. Raise the top enclosure up slightly to verify that the slider knobs and switch button caps are correctly positioned through their openings in the top enclosure.

2. Align the center screw hole on front panel edge with the thread marks in the extrusion and install the screw that secures the front panel edge of the Slider Board. See Figure 4-9.

3. Place the PC board clamp in position. Align the center screw holes of the PC board clamp with the thread marks in the extrusion and install the two screws that secure the PC board clamp.

4. Connect the wire trap ﬂat ribbon cables in the following order.

PC2/PC2X Disassembly/Assembly

Top Enclosure

Insert the seven-wire ﬂat ribbon cable from the Connector Board into the wire trap connector at J101 on the Slider Board.

Insert the eight-wire ﬂat ribbon cable from the Front Panel Board into the wire trap connector at J102 on the Slider Board.

5. If the unit you are servicing has a PCX-1 Board, follow the procedure on page 4-13 to install it.

6. Follow the procedure on page 4-8 to install the left enclosure support wall.

Removing the Engine Board

1. Follow the procedure described on page 4-8 to remove the left enclosure support wall.

2. If the unit you are servicing has a PCX-1 Board installed, remove it following the procedure described on page 4-13.

3. Following Steps 4–6, disconnect the cables listed in Table 4-4.

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Page 54

PC2/PC2X Disassembly/Assembly

Top Enclosure

Ref. Name Cable Type Destination

J402 PC2 PWR stranded wire Connector Board

J403 MIDI & CPU ﬂat ribbon Connector Board

J405 Backlight stranded wire LCD Board

J406 LCD ﬂat ribbon LCD Board

J412 PC2 Audio Out ﬂat ribbon Connector Board

Table 4-4 Engine Board cables

4. The ﬂat ribbon cables connected to J403 and J412 use wire trap connectors. The shielding has been removed from the end of these cables to expose the wires. The wires are inserted directly into these connectors.

5. Disconnect the stranded wire cables from J402 and J405.

6. Remove the cable locking clip and disconnect the ﬂat ribbon cable from J406. Be sure to set the cable locking clip safely aside so that you can install it when you reconnect the cable.

7. Two of the screws that secure the left enclosure support wall also secure the front panel edge of the Engine Board. You have already removed the enclosure support wall, but one screw remains securing this edge of the board. See Figure 4-10, and remove the remaining screw.

PC board clamp and screws

J405

J406

J403

Front panel edge screw

J402

J412

Figure 4-10 Engine Board, screw locations

8. Remove the two screws that secure the PC board clamp and rear panel edge of the Engine Board to the top enclosure.

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9. Remove the Engine Board.

Page 55

Replacing the Engine Board

1. Place the Engine Board in position on the top enclosure.

2. Align the center screw hole on the front panel edge with the thread marks in the extrusion and install the screw that secures the front panel edge. See Figure 4-10.

3. Place the PC board clamp in position. Align the center screw holes of the PC board clamp with the thread marks in the extrusion and install the two screws that secure the PC board clamp.

4. Connect the ﬂat ribbon cable from the LCD to J406 on the Engine Board. Be sure to install the cable locking clip.

5. Connect the stranded wire cable from the LCD to J405 on the Engine Board.

6. Connect the stranded wire cable from the Connector Board to J402 on the Engine Board.

7. Connect the wire trap ﬂat ribbon cables in the following order.

PC2/PC2X Disassembly/Assembly

Top Enclosure

Insert the ten-wire ﬂat ribbon cable from the Connector Board into the wire trap connector at J403 on the Engine Board.

Insert the ﬁve-wire ﬂat ribbon cable from the Connector Board into the wire trap connector at J412 on the Engine Board.

8. If the unit you are servicing has a PCX-1 Board, follow the procedure on page 4-13 to install it.

9. Follow the procedure on page 4-8 to install the left enclosure support wall.

Removing the Mod Wheel Assembly

1. Refer to Figure 4-11 on page 4-19. Slide the left side of the unit forward off of your work surface so that you can access the four screws and washers securing the assembly to the bottom enclosure. Remove the four screws and washers.

2. Slide the unit back onto your work surface.

3. Lift the Mod Wheel Assembly up, approximately two inches. Nylon reinforced tape secures the Aftertouch ﬂex cable(s) to the bottom enclosure. Peel back the tape from one side and disconnect the cable(s).

Note: If you are servicing a PC2, one ﬂat ﬂex cable attaches to the Mod Wheel Assembly, location J202. If you are servicing a PC2X, two ﬂat ﬂex cables attach to the Mod Wheel Assembly, locations J202 and J203.

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PC2/PC2X Disassembly/Assembly

Top Enclosure

4. The ﬂat ribbon cables connected to the two boards on the Mod Wheel Assembly use wire trap connectors. The shielding has been removed from the end of these cables to expose the wires. The wires are inserted directly into these connectors.

From the Mod Wheel Assembly, disconnect the ﬂat ribbon cable from J201 on the Wheels Board. This cable connects to J308 on the Connector Board.

From the Mod Wheel Assembly, disconnect the ﬂat ribbon cable from J701 on the IBBB Board. This cable connects to J601 on the Front Panel Board.

5. Remove the Mod Wheel Assembly.

Replacing the Mod Wheel Assembly

1. Hold the Mod Wheel Assembly in position over the bottom enclosure.

2. Connect the wire trap ﬂat ribbon cables in the following order.

Insert the six-wire ﬂat ribbon cable from the Connector Board into the wire trap connector at J201 on the Wheels Board.

Insert the ﬁve-wire ﬂat ribbon cable from the Front Panel Board into the wire trap connector at J701 on the IBBB Board.

3. Connect the ﬂat ﬂex cable(s).

Note: If you are servicing a PC2, connect the ﬂat ﬂex cable to location J202 on the Mod Wheel Assembly. If you are servicing a PC2X, connect the two ﬂat ﬂex cables to locations J202 and J203 on the Mod Wheel Assembly.

4. Reapply the nylon reinforced tape to the ﬂat ﬂex cable(s).

5. Lower the Mod Wheel Assembly into position.

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6. Slide the unit forward and install the four screws and washers to secure the Mod Wheel Assembly to the bottom enclosure.

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PC2 Keyboard Assembly

This section describes the removal and replacement of the PC2 (76-note) Keyboard Assembly. See page 4-26 for the corresponding procedures for the PC2X (88-note) Keyboard Assembly.

Removing the PC2 Keyboard Assembly

The following procedure assumes that the PC2 is open and that you have followed the instructions on page 4-4 to remove the top enclosure.

The PC2 keyboard is mounted onto a wooden spacer and is secured to the wooden spacer with 16 screws. The Keyboard Assembly refers to the keyboard and the wooden spacer. The assembly is secured to the bottom enclosure with eight screws.

Note: The following steps describe the procedure to remove the keyboard from the PC2 and the wooden spacer to gain access to the keys, contacts, contact boards, and key weights. If you need to gain access to the keys only (i.e. key replacement), you can do so by following the procedure described on page 4-21, Disconnecting the PC2 Keyboard.

1. Refer to Figure 4-11. This illustration shows the locations of the keyboard and keyboard wooden spacer screws. Both sets of screws are accessible from the bottom enclosure.

PC2/PC2X Disassembly/Assembly

PC2 Keyboard Assembly

keyboard front screws

Keyboard

front

wooden spacer screws

rear

Access panel

Rear panel

keyboard rear screws

Figure 4-11 PC2 76-note keyboard bottom

2. Tilt the PC2 up and remove the four keyboard rear screws, then lay the PC2 ﬂat on your work surface.

3. Move the PC2 forward so that the front hangs over the edge of your work surface, giving you access to the remaining screws.

4. Remove the four keyboard front screws.

5. Remove the four Mod Wheel screws and washers. At this point the keyboard is loose in the bottom enclosure, but it has cables connected to the Mod Wheel Assembly, the Connector Board, and the Front Panel Board.

6. Slide the PC2 back onto your work surface.

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PC2/PC2X Disassembly/Assembly

PC2 Keyboard Assembly

7. Lift the Mod Wheel Assembly and disconnect the Aftertouch ﬂex cable. This cable has nylon reinforced tape securing it to the bottom enclosure. Peel back the tape from one side to free the cable.

8. Place the Mod Wheel Assembly in its position on the bottom enclosure.

9. Remove the cable locking clips and disconnect the ﬂat ribbon cables from locations J306 (Treble) and J307 (Bass) on the Connector Board. These cables are also secured to the bottom enclosure with nylon reinforced tape. Peel back the tape from one side to free the cables.

10. Remove the Keyboard Assembly.

11. The keyboard is mounted onto a wooden spacer. Sixteen screws secure the spacer to the keyboard.

12. Lay the Keyboard Assembly upside down on a ﬂat protected surface and remove the 16 screws and remove the spacer. You can now access the components of the Keyboard Assembly.

Replacing the PC2 Keyboard Assembly

Note: If you have disconnected the Bass and Treble ends of the ﬂat ribbon cables from the keyboard contact boards during service, be sure that you have reconnected them and reapplied the tape to secure the connectors.

1. Place the keyboard upside down on a ﬂat protected surface and position the wooden spacer over the keyboard. Install the 16 screws that secure the wooden spacer to the keyboard.

2. Place the Keyboard Assembly on the bottom enclosure. Be sure that the ﬂat ribbon cables from the keyboard are correctly positioned.

3. Connect the ﬂat ribbon cables to the Connector Board and reapply the cable locking clips. Be sure to reapply the nylon reinforced tape that secures the ﬂat ribbon cable to the bottom enclosure.

4. Lift the Mod Wheel Assembly and connect the Aftertouch ﬂex cable. Be sure to reapply the nylon reinforced tape that secures the ﬂex cable to the bottom enclosure. Place the Mod Wheel Assembly in its position on the bottom enclosure.

5. Move the PC2 forward so that the front hangs over the edge of your work surface, and install the four keyboard front screws.

6. Install the four Mod Wheel Assembly screws and washers.

7. Slide the PC2 back onto your work surface.

8. Tilt the PC2 up and install the four keyboard rear screws.

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Disconnecting the PC2 Keyboard

Follow this procedure if you are merely replacing one or more keys.

1. Refer to Figure 4-11.

2. Tilt the PC2 up and remove the four keyboard rear screws, then lay the PC2 ﬂat on your work surface.

3. Move the PC2 forward so that the front hangs over the edge of your work surface, giving you access to the remaining screws.

4. Remove the four keyboard front screws.

Caution: The keyboard Aftertouch ﬂex cable from the keyboard is connected to the Mod Wheel Assembly and is secured to the bottom enclosure with reinforced tape. When following the instructions below, be certain that you only slightly lift or move the Keyboard Assembly to avoid damage to the ﬂex cable.

5. The 16 screws that secure the keyboard to the wooden spacer rest in holes provided for them on the bottom enclosure. To move the keyboard, lift the keyboard up slightly to free the 16 screws from their positions on the bottom enclosure.

PC2/PC2X Disassembly/Assembly

PC2 Keyboard Assembly

6. Lift the keyboard up and move it approximately one inch to the right (as viewed standing at the keyboard).

7. You can now move the keyboard back approximately one inch toward the rear so that you can remove keys for replacement. See page 4-22 for the procedure to remove and replace keys.

Connecting the Keyboard

1. Position the keyboard so that the 16 screws that secure the wooden spacer to the keyboard are resting in the holes provided for them on the bottom enclosure.

Caution: Be certain that the Aftertouch ﬂex cable is correctly positioned and that the nylon reinforced tape securing it to the bottom enclosure is still properly applied.

2. Refer to Figure 4-11.

3. Move the PC2 forward so that the front hangs over the edge of your work surface, and install the four keyboard front screws.

4. Slide the PC2 back onto your work surface.

5. Tilt the PC2 up and install the four keyboard rear screws.

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PC2/PC2X Disassembly/Assembly

PC2 Keyboard Assembly

Removing Keys

The following procedure assumes you have removed the top enclosure from the PC2.

1. Follow the procedure for removing the keyboard (page 4-19) or disconnecting the keyboard (page 4-21).

2. The following diagrams illustrate the outlines of the natural and sharp keys and the locations and functions of the components described in the following procedures.

Natural/White Key

Pivot location

Key spring location

Strikes the front and rear key contact on key depression

Mounts through the keyboard chassis

Figure 4-12 Natural/White key, 76-note keyboard

Pivot location

Key spring location

Strikes the front and rear key contact on key depression

Figure 4-13 Sharp/Black key, 76-note keyboard

Mounts through the keyboard chassis

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Natural/White Keys

1. Each key has a spring located at the rear of the key. Using needle-nose pliers, slightly pull up the top portion of the spring to release it from the key.

Caution: Be careful not to pull up too much, which could damage the spring.

2. Unlock the key from the pivot anchoring the key to the keyboard chassis. To do this, insert a small ﬂat screwdriver at the back end of the pivot and press toward the front edge of the keyboard. While doing so, lift the back end of the key (where the spring was positioned).

Use needle-nose pliers to pull up the top portion of the spring.

PC2/PC2X Disassembly/Assembly

PC2 Keyboard Assembly

Pivot - After the spring is removed, insert a small flat screwdriver here to remove the key.

Spring

Figure 4-14 Key spring location, 76-note keyboard

3. The key should now be free of the pivot. Remove the screwdriver.

4. Lift the key up slightly, then forward. You should be able to feel when the key is free of the pivot. A portion of the key hooks onto the keyboard chassis (see Figure 4-12). Lifting the back end of the key forward unhooks the key from the keyboard chassis.

Sharp/Black Keys

1. To remove a sharp key, ﬁrst remove the adjacent natural keys, as described in the previous procedure.

2. Each key has a spring located at the rear of the key. Using needle-nose pliers, slightly pull up the top portion of the spring to release from the key.

Caution: Be careful not to pull up too much, which could damage the spring.

3. Unlock the key from the pivot anchoring the key to the keyboard chassis. To do this, insert a small ﬂat screwdriver at the back end of the pivot and press toward the front edge of the keyboard. While doing so, lift the back end of the key (where the spring was positioned).

Keyboard chassis section

4. The key should now be free of the pivot. Remove the screwdriver.

5. Lift the key up slightly, then forward. You should be able to feel when the key is free of the pivot. A portion of the key hooks onto the keyboard chassis (see Figure 4-13). Lifting the back end of the key forward unhooks the key from the keyboard chassis.

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PC2/PC2X Disassembly/Assembly

PC2 Keyboard Assembly

Replacing a Key

The following instructions apply to both natural and sharp keys.

Note: Always replace a sharp key before replacing the adjacent natural keys.

1. Place the key on the keyboard chassis and lower the key into position.

2. Align the pivot with the hole at the rear of the key. Push down on the key. It should snap into position on the pivot.

3. Install the spring.

Servicing the Keyboard Contact Boards

Follow the procedure on page 4-19 to remove the Keyboard Assembly.

1. Place the keyboard upside down on a ﬂat soft surface. Be sure that the keys are resting on a soft surface to avoid scratching or other damage. The Treble and Bass Contact Boards are now visible.

Removing the Treble Contact Board

1. Peel back the nylon tape securing the connector, and disconnect the ﬂat ribbon cable from the Treble Contact Board.

2. Remove the 24 screws that secure the Treble Contact Board to the keyboard chassis, and remove the Treble Contact Board.

Replacing the Treble Contact Board

1. Position the Treble Contact Board on the keyboard chassis. Be sure that the rubber key contacts line up properly through the holes in the keyboard chassis.

2. Install the 24 screws that secure the board to the keyboard chassis.

3. Connect the treble end of the ﬂat ribbon cable and reapply the nylon tape to the connector.

Removing the Bass Contact Board

1. Peel back the nylon tape securing the connector, and disconnect the ﬂat ribbon cable from the Bass Contact Board.

2. Remove the 18 screws that secure the board to the keyboard chassis, and remove the Bass Contact Board.

Replacing the Bass Contact Board

1. Position the Bass Contact Board on the keyboard chassis. Be sure that the rubber key contacts line up properly through the holes in the keyboard chassis.

4-24

2. Install the 18 screws that secure the board to the keyboard chassis.

3. Connect the bass end of the ﬂat ribbon cable and reapply the nylon tape to the connector.

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Removing the Keyboard Contact Strips

1. Place the keyboard upside down on a ﬂat soft surface. Be sure that the keys are resting on a soft surface to avoid scratching or other damage.

2. Follow the procedure for removing the Bass and Treble Keyboard Contact Boards on page 4-24.

3. Examine the keyboard contact strips and look at the design of an individual contact. The top portion of the contact has two indentations. One indentation is deeper than the other. When replacing the keyboard contact strips, the deeper indentation is always positioned toward the rear of the key.

4. The keyboard contact strips have mounting pegs that secure the contact strips to the keyboard contact boards.

5. To remove a keyboard contact strip, gently lift and free the strip from its position. Be careful not to rip or damage any contact in the process.

Pivot location

PC2/PC2X Disassembly/Assembly

PC2 Keyboard Assembly

Front of key

Key spring location

PC board

Mounting pegs

Deeper contact to back

Figure 4-15 Side view of the natural/white key, 76-note keyboard

Replacing the Keyboard Contact Strips

1. Position the contact strip on the keyboard contact board.

Note: Be sure that the deeper indentation is positioned toward the rear of the key.

2. Line up the contact strip mounting pegs with their respective mounting holes on the keyboard contact board.

Strikes the front and rear key contact on key depression

Key contacts (side view)

Key contacts (top view)

3. Using a small blunt-end tool (Q-Tip, toothpick, etc.), gently push the mounting pegs through the holes. Do not use too much force or use a tool that can poke a hole through the mounting pegs. However, be sure that the mounting pegs are installed through the holes.

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PC2/PC2X Disassembly/Assembly

PC2X Keyboard Assembly

Removing the PC2X Keyboard Assembly

The following procedure assumes that the PC2X is open and that you have followed the instructions to remove the top enclosure.

1. The keyboard is secured to the bottom enclosure using ten screws. Refer to Figure 4-16 for the position of the screws. Arrows identify the locations of the ten screws.

2. Tilt the PC2X up and remove the ﬁve keyboard rear screws, then lay the PC2X ﬂat on your work surface.

3. Move the PC2X forward so that the front hangs over the edge of your work surface to access the remaining screws, and remove the ﬁve keyboard front screws.

4. Remove the four Mod Wheel screws and washers. At this point the keyboard is loose in the bottom enclosure, but it has cables connected to the Mod Wheel Assembly and the Connector Board.

Keyboard

Keyboard front screws

Keyboard rear screws

Access panel

Mod Wheel screws

Rear panel

Figure 4-16 PC2X 88-note keyboard bottom

5. Slide the PC2X back onto your work surface.

6. Lift the Mod Wheel Assembly and disconnect the Aftertouch ﬂex cables. These cables have nylon reinforced tape securing them to the bottom enclosure. Peel back the tape from one side to free the cables.

7. Place the Mod Wheel Assembly in its position on the bottom enclosure.

8. Remove the cable locking clips and disconnect the ﬂat ribbon cables from locations J306 and J307 on the Connector Board. These cables are also secured to the bottom enclosure with nylon reinforced tape. Peel back the tape from one side to free the cables.

Note: If you are merely replacing one or more keys, it is not necessary to entirely remove the Keyboard Assembly from the PC2X. Follow the procedure on page 4-27.

4-26

9. Remove the Keyboard Assembly.

Page 65

Replacing the PC2X Keyboard Assembly

1. Place the keyboard on the bottom enclosure. Be sure that the ﬂat ribbon cables from the keyboard are correctly positioned to connect them to the Connector Board.

Note: If you have disconnected the Bass and Treble ends of the ﬂat ribbon cables from the keyboard contact boards during service, be sure that you have reconnected them and secured them with tape. Be sure that the small ribbon cable connecting the Bass and Treble Contact Boards is connected.

2. Connect the ﬂat ribbon cables to J306 and J307 on the Connector Board and reapply the cable locking clips.

3. Secure the ﬂat ribbon cables to the bottom enclosure. Be sure to reapply the nylon reinforced tape that secures the cables to the bottom enclosure.

4. Lift the Mod Wheel Assembly and connect the Aftertouch ﬂex cables. Be sure to reapply the nylon reinforced tape that secures the ﬂex cables to the bottom enclosure.

5. Slide the PC2X forward so that you can install the ﬁve keyboard front screws.

6. Install the four Mod Wheel Assembly screws and washers.

PC2/PC2X Disassembly/Assembly

PC2X Keyboard Assembly

7. Slide the PC2X back on to your work surface.

8. Tilt the PC2X up and install the ﬁve keyboard rear screws.

Removing Keys

The following procedure assumes you have removed the top enclosure from the PC2X.

1. Follow the procedure for removing the keyboard.

Note: If you are merely replacing one or more keys, it is not necessary to entirely remove the keyboard from the PC2X. Once the keyboard is loose, you can slide it toward the rear panel to give you enough access to remove keys.

2. The following diagrams illustrate the outlines of the natural and sharp keys and the location and functions of the components described in the following procedures.

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PC2/PC2X Disassembly/Assembly

PC2X Keyboard Assembly

Natural/White Key

Pivot location

Key spring location

Strikes the front and rear key contact on key depression

Figure 4-17 Natural/white key, 88-note keyboard

Pivot location

Key spring location

Strikes the front and rear key contact on key depression

Figure 4-18 Sharp/black key, 88-note keyboard

Hooks under the front of the keyboard chassis

Mounts through the keyboard chassis

Hooks under the front of the keyboard chassis

Mounts through the keyboard chassis

Natural/White Keys

1. Remove the silver key spring located at the rear of the key. You will notice that the bottom of the spring is secured to the keyboard chassis by a hook.

You can remove the spring by inserting a dowel (3mm diameter) into the spring, and pushing down on it slightly. Then pull the top of the dowel toward the front of the keyboard. This will unhook the spring from the keyboard chassis.

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Insert a 3mm dia. dowel into the spring and push down slightly.

Then move the top of the dowel toward the front of the keyboard to remove the spring from the hook.

Keyboard chassis section

Hook

Figure 4-19 Key spring

PC2/PC2X Disassembly/Assembly

PC2X Keyboard Assembly

Insert the screwdriver here

Pivot

3. The key should now be free of the pivot. Remove the screwdriver.

4. Lift the key up slightly, then forward. You should be able to feel when the key is free of the pivot. The front edge of each key hooks under the keyboard chassis. Be sure the key is not hooked under the keyboard chassis prior to lifting the key off.

Sharp/Black Keys

1. To remove a sharp key, ﬁrst remove the adjacent natural keys, as described in the previous procedure.

2. Remove the gold key spring located at the rear of the sharp key. You will notice that the bottom of the spring is secured to the keyboard chassis by a hook.

Refer to Figure 4-19. You can remove the spring by inserting a dowel (3mm diameter) into the spring, and pushing down on it slightly. Then pull the top of the dowel toward the front of the keyboard. This will unhook the spring from the keyboard chassis.

3. Unlock the key from the pivot anchoring the key to the keyboard chassis. To do this, insert a small ﬂat screwdriver at the bottom of the pivot and press toward the front edge of the keyboard. While doing so, lift the back end of the key (where the spring was positioned).

4. The key should now be free of the pivot. Remove the screwdriver.

5. Lift the key up slightly, then forward. You should be able to feel when the key is free of the pivot. The front edge of each key hooks under the keyboard chassis. Be sure the key is not hooked under the keyboard chassis prior to lifting the key completely off.

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PC2/PC2X Disassembly/Assembly

PC2X Keyboard Assembly

Replacing a Key

1. The following instructions apply to both natural and sharp keys.

Note: Always replace a sharp key before replacing the adjacent natural keys.

2. Hook the front end of the key under the keyboard chassis.

3. Check that the mounting peg is correctly positioned.

4. Lower the key into position. Align the pivot with the hole at the rear of the key.

5. Push down on the key. It should snap into position onto the pivot.

6. Install the spring.

Servicing the Keyboard Contact Boards

1. Place the keyboard upside down on a ﬂat soft surface. Be sure that the keys are resting on a soft surface to avoid scratching or other damage. The Treble and Bass Contact Boards are now visible.

Removing the Treble Contact Board

1. Disconnect the ﬂat ribbon cable that connects the Treble Contact Board to the Connector Board. The connector is secured with tape. Peel back the tape to free the cable.

2. Disconnect the small ribbon cable that connects the Treble and Bass Contact Boards.

3. Remove the 26 screws that secure the Treble Contact Board to the keyboard chassis, and remove the Treble Contact Board.

Replacing the Treble Contact Board

1. Position the Treble Contact Board on the keyboard chassis. Be sure that the rubber key contacts line up properly through the holes in the keyboard chassis.

2. Install the 26 screws that secure the board to the keyboard chassis.

3. Connect the small ribbon cable that connects the Treble to the Bass Contact Board.

4. Connect the ﬂat ribbon cable that connects the Treble Contact Board to the Connector Board. Be sure to reapply the tape to secure the connector.

Removing the Bass Contact Board

1. Disconnect the ﬂat ribbon cable that connects the Bass Contact Board to the Connector Board. The connector is secured with tape. Peel back the tape to free the cable.

2. Disconnect the small ribbon cable that connects the Bass and Treble Contact Boards.

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3. Remove the 22 screws that secure the board to the keyboard chassis, and remove the Bass Contact Board.

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Replacing the Bass Contact Board

1. Position the Bass Contact Board on the keyboard chassis. Be sure that the rubber key contacts line up properly through the holes in the keyboard chassis.

2. Install the 22 screws that secure the board to the keyboard chassis.

3. Connect the small ribbon cable that connects the Bass to the Treble Contact Board.

4. Connect the ﬂat ribbon cable that connects the Bass Contact Board to the Connector Board. Be sure to reapply the tape to secure the connector.

Removing the Keyboard Contact Strips

1. Place the keyboard upside down on a ﬂat soft surface. Be sure that the keys are resting on a soft surface to avoid scratching or other damage.

2. Follow the procedure to remove the Bass and Treble Keyboard Contact Boards.

PC2/PC2X Disassembly/Assembly

PC2X Keyboard Assembly

4. The keyboard contact strips have mounting pegs that secure the contact strips to the keyboard contact boards.

5. To remove a keyboard contact strip, gently lift and free the strip from its position. Be careful not to rip or damage any contact in the process.

Pivot

Key spring location

location

PC board

Mounting pegs

Strikes the front and rear key contact on key depression

Key contacts (side view)

Key contacts (top view)

Deeper contact to back

Front of key

Figure 4-20 Side view of the natural/white key, 88-note keyboard

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PC2/PC2X Disassembly/Assembly

PC2X Keyboard Assembly

Replacing the Keyboard Contact Strips

1. Position the contact strip on the Keyboard Contact Board that you are servicing.

Note: Be sure that the deeper indentation is positioned toward the rear of the key.

2. Line up the contact strip mounting pegs with their respective mounting holes on the keyboard contact board.

Removing a Key Weight

1. The main components of the weighted-key action consist of the following: the 88 keys, two rods, 88 key weights, and support brackets for the key weights and rods. There are seven 12-position brackets and one 4-position bracket.

Note: Key weights are attached to one of the two rods that span the length of the keyboard. The ﬁrst rod is referred to as the bass rod and the second rod is referred to as the treble rod. The ﬁrst rod (the bass rod) begins at low A and extends to G# above Middle C. The second rod (the treble rod) begins at A above Middle C and extends to High C.

2. To replace a key weight, identify the section with the broken key weight and remove all the keys from that section. The key weights, rods, and support brackets are now visible.

3. There is a locking clip at each end of the keyboard. To remove the locking clips, use a standard screwdriver to pry the locking clips off.

4. Pry the rod up from the support bracket. The key weights remain attached to the rod.

5. To remove the key weights from the rod, move the key weight side to side and pull it away from the rod. The key weight should easily pop off the rod.

Note: The natural and sharp key weights are physically different. The sharp key weights are smaller. When you remove multiple key weights, do so in a way that you will be able to place the new natural and sharp key weights in their correct positions.

Natural/White

key weight

Sharp

key weight

Figure 4-21 Natural/White and Sharp/Black key weights

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6. Remove the broken key weight(s) and inspect the other key weights for reliability.

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Replacing a Key Weight

1. Each key weight has a strip of red felt attached with pliable adhesive. Be sure the red felt extends onto the upper surface of the top of the key weight.

2. Place the key weight in position against the rod and snap it onto the rod with slight pressure.

Note: Be sure to place the sharp key weights in the correct positions.

3. Place the rod and key weights into position over the support brackets and snap the rod into the support brackets. Be certain that the rod is pressed securely into the support brackets.

4. Prior to replacing the keys, check that each key weight moves freely. To do this, position a screwdriver at the back end of the key weight (on the red felt), press down and remove the screwdriver. The key weight should move up and down freely.

5. Install the keys and key springs.

PC2/PC2X Disassembly/Assembly

PC2X Keyboard Assembly

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PC2/PC2X Disassembly/Assembly

PC2X Keyboard Assembly

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Chapter 5 Troubleshooting

Introduction

Cables, Connectors

Flat Ribbon Cables

Cable Routing

Surface-Mount Devices

The removal and replacement of surface-mount devices requires training and the proper equipment. If you do not have the training or equipment to remove or replace surface-mount devices, contact the service department to order a board replacement. International service technicians should contact their appropriate Young Chang Distributor.

Saving User Data

1. Set up a MIDI recording device.

2. Connect the a MIDI cable to the MIDI Out port of the PC2 to the MIDI In port on the external device.

3. Press the Global button on the PC2. Press the Right cursor button until the LCD displays

Dump all Objects?

4. Begin recording on the MIDI recording device.

5. Press Enter on the PC2. The LCD shows the objects being saved. When all objects are saved, Dump all Objects? will appear in the LCD.

6. To reload the saved objects, connect a MIDI cable from the MIDI Out port of the recording device to the PC2’s MIDI In port.

7. From the external device, begin the playback of the ﬁle.

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Troubleshooting

Boot Block

Use the PC2’s Boot Loader to enter Diagnostics or perform a Hard Reset to the unit. You can also install operating system updates and ROM objects into Flash ROM.

Entering the Boot Block

Apply power to the unit. When the Please wait... message appears in the LCD, quickly press and release the Panic button for PC2 keyboard units or Edit button for PC2R rack units.

The LCD displays the main menu of the Boot Loader and the ﬁrst available option. Use the Left or Right cursor button to advance to the next option. The menu options are as follows:

Install Engine—Installs new operating system software upgrades.

Install ROM option—Loads Sound ROM presets after installing a Sound ROM option.

Update boot block—Installs boot block updates.

Run diagnostics—Enters the diagnostic test menu. For a complete list of tests and the procedure

to execute the diagnostic tests, refer to Chapter 2, Diagnostics.

Run engine—Exits the boot block and returns the unit to normal operation.

Resets

Hard Reset

Soft Reset

Hard RESET—Clears the memory to factory default settings.

There are two ways to perform a Hard Reset to the PC2.

1. Press the Global button and press the Right cursor button to step through the Global parameters to Reset PC2? and press the Enter/Yes button. The LCD displays an

Are you sure? message. Press the Enter/Yes button to continue or the Cancel/No.

2. Enter the Boot Loader and press either the Left or Right cursor button to scroll through the menu. Press Enter to select Hard Reset. The LCD displays an Erase RAM objects? message. Press the Right button to execute the hard reset. Press the Left button to cancel.

The Soft Reset does not erase user programs and setups and is equivalent to turning the power off and on. To Soft Reset a PC2R, simultaneously press the FX, MIDI Receive and Global buttons. To Soft Reset a PC2, simultaneously press the +/-, 0 and Clear buttons.

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Software Updates

A computer with a MIDI interface and sequencer is necessary to transfer software to your PC2 units MIDI Sysex.

File Formats

Software upgrades are stored as standard MIDI ﬁles. Filenames are in the format PC2XVV.MID, where X is the software block and VVV is the version number (V.VV). The following lists the possible values for X. Never install ﬁles with names that don’t conform to this format; it won’t work.

bk—boot block for keyboard models

br—boot block for rack models

bp—boot block for Polyphone Expansion (PCX-1) option (keyboard and rack units)

k—operating system software for keyboard models

r—operating system software for rack models

p—operating system for Polyphony Expansion (PCX-1) option (keyboard and rack models)

Troubleshooting

Software Updates

s—soundware data for keyboard and rack models

sp—soundware data for Polyphony Expansion (PCX-1) option (keyboard and rack models)

Installing the Operating System or Setups

Warning: This procedure requires performing a hard reset. All user programs and setups will be erased. Before continuing, be sure to save all user programs and setups.

1. Connect a MIDI cable from the MIDI Out port of the computer interface or sequencer to the MIDI In port on the PC2.

2. Open the ﬁrst .MID ﬁle using the sequencer program.

3. Turn on the PC2 and follow the procedure to enter the Boot Block.

4. Press the Enter button to select Install engine.

5. Press the Enter button to select via MIDI.

6. The LCD shows Waiting for MIDI. Start playing the MIDI ﬁle from the sequencer. While a ﬁle is loading, the bottom line of the display shows the progress. If the display continues to show Waiting for MIDI after starting the sequencer, stop and restart the sequence.

7. After the ﬁle is loaded, the display will show done.

8. If you have additional ﬁles to load, open the ﬁle from the sequencer and begin playing it.

9. Press the Cancel button twice to return to the main menu. Scroll to Hard Reset and select

Yes.

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Troubleshooting

Software Updates

Installing a New Boot Block

Warning: This procedure performs a hard reset. All user programs and setups will be erased. Before continuing, be sure to save all user programs and setups.

1. Connect a MIDI cable from the MIDI Out port of the computer interface or sequencer to the MIDI In port on the PC2.

2. Using the sequencer program, open the ﬁrst .MID ﬁle.

3. Turn on the PC2 and follow the procedure to enter the Boot Block.

4. Press the Enter button to select Update boot block.

5. Press the Enter button to select via MIDI.

7. After the ﬁle is loaded, the unit will reset.

Installing Sound ROM Options

After installing a Sound ROM option, the presets need to be transferred into Flash ROM.

Warning: This procedure requires performing a hard reset. All user programs and setups will be erased. Before continuing, be sure to save all user programs and setups.

1. Turn on the PC2 and follow the procedure to enter the Boot Block.

2. Use the Left or Right cursor button to scroll to Install ROM option, and press the Enter button.

3. Use the Left or Right cursor button to select the appropriate option for the card you are installing, card 1 or card 2.

4. Press the Enter button. The LCD indicates Installing as the presets transfer into Flash ROM.

Note: If you are installing a second ROM option repeat Steps 3 and 4.

5. Use the Left or Right cursor button to scroll to Hard Reset, and press the Enter button.

6. Select Yes to hard reset the unit. The unit now has the additional ROM option setups installed.

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Replacing the Battery

The PC2 uses a ﬂat three volt Lithium coincell battery. When the battery voltage runs low, the unit boots up with a low battery message.

Note: The battery voltage can be checked at anytime using the Scanner Diagnostics. See page 5-7 for more information.

PC2 Keyboard Models

Accessing the Battery

1. Place the PC2 upside down on a ﬂat protected surface.

2. Remove the seven screws that secure the access panel and set it safely aside.

3. If the unit has Sound ROM options installed, remove them.

Removing the Battery

The battery (CR2032) in the PC2 keyboard is mounted into a holder on the Engine Board and is accessible when the access panel is removed.

Troubleshooting

Replacing the Battery

1. Insert a ﬂat plastic tool (plastic knife, pen cap, etc.) into one of the openings between the battery and the holder to lift the battery.

Insert the tool here to lift the battery.

Figure 5-1 Battery and holder

2. Ease the battery out of the holder. If necessary, insert the plastic tool at the bottom of the holder (closest to the Engine Board) to remove the battery.

Installing the Battery

1. Position the battery over the holder so that the positive terminal is pointing to the Engine Board.

2. Slide the battery into the holder and apply slight pressure until it snaps into place.

CR2032

Insert the tool between the holder and the battery to ease the battery out of the holder.

3. If the unit has Sound ROM options, install them.

4. Install the seven screws to secure the access panel.

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Page 78

Troubleshooting

Replacing the Battery

PC2R Rack Models

Accessing the Battery

1. Remove the seven screws that secure the top cover.

2. Slide the top cover back from the Front Panel Assembly to release the top cover from the bottom enclosure, and place the top cover safely aside to avoid damage.

3. If the unit has Sound ROM options installed, remove them.

Removing the Battery

The battery (CR2032) in the PC2 keyboard is mounted into a holder on the Engine Board and is accessible when the access panel is removed.

1. Refer to Figure 5-1. Insert a ﬂat plastic tool (plastic knife, pen cap, etc.) into one of the openings between the battery and the holder to lift the battery.

2. Ease the battery out of the holder. If necessary, insert the plastic tool at the bottom of the holder (closest to the Engine Board) to remove the battery.

Installing the Battery

1. Position the battery over the holder so that the positive terminal is pointing to the Engine Board.

2. Slide the battery into the holder and apply slight pressure until it snaps into place.

3. If the unit has Sound ROM options, install them.

4. Place the top cover in position and slide it toward the Front Panel Assembly.

5. Install the seven screws that secure the top cover.

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Scanner Tests

PC2R Rack Models

The Scanner Tests for the PC2R rack model include separate tests for the front panel buttons and LEDs, rotary potentiometers including Knobs A–D and Volume, and the Alpha Wheel.

To enter the Scanner Tests, ﬁrst turn on the PC2R. Once the PC2R is on and ready to play, simultaneously hold down the three buttons located in the top row of the Modes section (Internal Voices, KB3 and MIDI Setups). All front panel LEDs will light in a sequence and the LCD will display the following:

Figure 5-2 LCD example, PC2R scanner tests

Troubleshooting

Scanner Tests

SCAN1.3 B=3.0 W=128 VOL SLIDER = 255

The ﬁrst line of the display shows the scanner software version, the battery voltage and the current value for the Mod Wheel position. Disregard the Mod Wheel value; it is applicable only to keyboard units. The second line shows the results of the current test. Figure 5-2 shows the result of the volume potentiometer test.

To exit the Scanner Tests and return to normal operation, simultaneously press the Cancel and Enter buttons.

Front Panel Buttons

To test a button, press any front panel button.

An example of the expected test result for the Solo button follows: BUTTON Solo

Alpha Wheel

To test the Alpha Wheel, turn it to increase or decrease the value by one. The expected test result when the Alpha Wheel is turned is one of four values–0, 1, 2, or 3:

SPINKNOB = 3

Front Panel Knobs

To test Knobs A–D or the Volume potentiometer, turn a knob to check its value at the bottom (zero, far left) and at the top (far right).

An example of the normal test results for the Knob A follows (your results may vary slightly):

At zero (far left): SLIDER 1 = 0

At top (far right): SLIDER 1 = 255

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Troubleshooting

Scanner Tests

PC2 Keyboard Models

The Scanner Tests for the PC2 keyboard models include separate tests for the front panel buttons and LEDs, front panel sliders including the Master Volume slider, the Alpha Wheel, the Mod and Pitch wheels, the keyboard, and the pedals.

To enter the Scanner Tests, ﬁrst turn on the PC2. Once the PC2 is on and ready to play, simultaneously hold down the 4, 5 and 6 buttons. All front panel LEDs will ﬂash and the LCD will display the following:

Figure 5-3 LCD example, PC2 scanner tests

The ﬁrst line of the display shows the scanner software version, as well as the battery voltage and the current value for the Mod Wheel position. The second line shows the results of the current test. Figure 5-3 shows the result of a key test—in this case striking the key C4 on the keyboard.

SCAN1.3 B=2.9 W=128 KEY C4 60 C4 60

To exit the Scanner Tests and return to normal operation, simultaneously press the Cancel and Enter buttons.

Front Panel Buttons

To test a button, press any front panel button. An example of the expected test result for the Solo button follows:

BUTTON Solo

Alpha Wheel

To test the Alpha Wheel, turn it to increase or decrease the value by one. The expected test result when the Alpha Wheel is turned is one of four values–0, 1, 2, or 3:

SPINKNOB = 3

Front Panel Sliders

To test the front panel sliders, move a slider to check its value at the bottom, center, and top. An example of the normal test results for the Slider A follows (your results may vary slightly):

At bottom: SLIDER 1 = 0

At center: SLIDER 1 = 128

At top: SLIDER 1 = 255

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Page 81

Troubleshooting

Wheels

To test the pitch and mod wheels, move the wheel up and down. An example of the expected test results for the pitch wheel follows (your results may vary slightly):

At bottom: PITCH WHEEL = 0

At center: PITCH WHEEL = 128

At top: PITCH WHEEL = 255

Keyboard

To test the keyboard, press any key. The key name and number will be displayed twice in the LCD. The ﬁrst set of name and number is the test result for the front key contact switch and the second is for the rear switch. An example of the expected test result for the Middle C key follows:

KEY C4 60 C4 60

Pressing harder the display will change and show the pressure value.

PRESSURE = 255

Scanner Tests

Switch Pedals 1, 2, and 3

To test a switch pedal, press the pedal. An example of the expected test result for the switch pedal 1 follows:

Full depression: PEDAL 1

Continuous Pedals 1 and 2

To test the continuous control pedal, press the pedal. An example of the expected test result for the continuous control pedal follows:

No depression: CTRL PEDAL = 255

Full depression: CTRL PEDAL = 0

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Page 82

Troubleshooting

Power Problems

Dead

1. Before opening the unit, verify the following:

• The AC outlet is supplying power.

• The AC adapter is properly connected to the unit.

2. Check the power switch, power jack and AC adapter.

3. Refer to the Interconnect Diagram. See page 5-13 for rack models or page 5-14 for keyboard models. Check all related connections.

4. Refer to the Connector Board schematics and check all supply voltages.

Audio Problems

No Audio

Note: If you are diagnosing a PC2R rack unit, you can check for audio without having a controller connected. Connect a pair of headphones, turn the power on. When the unit is on and ready to play, simultaneously press the MIDI Receive and Global buttons to play one of the stored demos. Flashing LEDs in the Performance section indicate the locations of the stored demos. Select one to play to check the audio. Press the Cancel button to exit.

1. Run the Scanner Diagnostics to check the volume slider operation.

2. Refer to the Interconnect Diagram. See page 5-13 for rack models or page 5-14 for keyboard models.

3. Check the ﬂat ribbon cable from J412 on the Engine Board to J302 on the Connector Board.

4. Check the solder connections at the connectors.

5. Refer to the Engine Board schematics and check the signal activity on the DAC, U23.

6. Trace the signal path.

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Page 83

Front Panel Problems

LCD not lit

1. Check the LCD contrast potentiometer. Turn the pot to see if there is any change.

Note: If you are servicing a PC2R rack unit, the LCD Contrast is located on the front panel. If you are servicing a PC2 keyboard, it is located on the rear panel.

2. Check the stranded wire cable from the LCD Board to J405 on the Engine Board. Disconnect and reseat the cable.

3. Check the ﬂat ribbon cable from the LCD Board to J406 on the Engine Board. Disconnect and reseat the cable.

4. Check the solder connections on the LCD and Engine Boards.

5. Refer to the Engine Board schematics and check the signal path.

Troubleshooting

Front Panel Problems

Buttons, Sliders or Controllers not working

1. Run the Scanner Tests.

Note: If you are servicing a PC2R rack unit, simultaneously press the Internal Voices, KB3 and MIDI Setups buttons located in the top row of the Modes section. If you are

servicing a PC2 keyboard, simultaneously press the 4, 5 and 6 buttons.

2. Refer to the Interconnect Diagram. See page 5-13 for rack models or page 5-14 for keyboard models.

3. Check all related cables.

4. Disconnect and reseat the cables.

5. Check the solder connections at the connectors.

6. Check front panel ribbon cable(s).

7. Refer to the Connector Board schematics and check U1, IC Scanner 37451, for signal activity.

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Page 84

Troubleshooting

Keyboard Problems

Dead Keyboard

1. Check the ﬂat ribbon cables connecting the keyboard Bass and Treble Contact Boards to the Connector Board, locations J306 and J307. Be certain that the cables are not loose or damaged.

2. Disconnect and reseat the cables.

3. Refer to the Connector Board schematics.

4. Check U1, IC Scanner 37451 on the Connector Board for keyboard signals.

5. Trace signal path.

6. Find and replace bad component(s) or order a board replacement.

Dead Note(s)

One or More in a Section

1. Remove related contact board.

2. Check contact strip for dirt, damage or wearing. Clean dirty contacts with denatured alcohol. Replace damaged or worn contact strip.

3. Install contact strip.

4. If section is still dead, remove strip and check contact board for shorts, cold solder joints, etc.

5. Find and replace bad component(s) or order replacement board.

Mechanical Noise

1. Check keyboard for broken key weights, support brackets, or ripped contacts.

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Page 85

PC2R Interconnect Diagram

Troubleshooting

PC2R Interconnect Diagram

Hp/Vol/Pwr Sw

Board

Vol/Pwr/Hp

FP Bridge 2

Left Front

Panel Board

J604

FP Bridge 2

J603

FP Bridge

J602

FP Bridge

Right Front

Panel Board

J601

Front Panel

Connector Board

J322

Vol/Pwr/Hp

J301

PC2 Power

J303

MIDI & CPU

J304

Front Panel

J302

Power In

LCD

Engine

Board

J404, EPROM Board

J406 LCD

J408

J410, Expansion Sound ROM 1

128 Chnl Opt

J409, Expansion Sound ROM 0

J403

MIDI & CPU

J405

Backlight

J402

PC2 PWR

J412

Audio Out

5-13

Page 86

Troubleshooting

PC2 Interconnect Diagram

Front Panel

Board

J604 Front Panel

Button Board

Engine

Board

J404, EPROM Board

J701

J602

FP Bridge

LCD

J601 IBBB

J406 LCD

J408

128 Chnl Opt

J405

Backlight

J410, Expansion Sound ROM 1

J409, Expansion Sound ROM 0

J403

MIDI & CPU

J402

PC2 PWR

J101 Slider

J102 FP Bridge

Audio Out

Slider Board

J412

J301

PC2 Power

J204 Pitch

Wheels Board

J201

Wheels

MIDI & CPU

J205 Mod

J303

Connector

Board

J308

Wheels

J203

J202

J306

Treble

J307 Bass

J304

Front Panel

88-note keyboards only

J302 Audio

J305 Slider

5-14

Page 87

Chapter 6 Parts Lists

Introduction

The parts lists included in this chapter cover all models of the PC2 series. Some printed circuit boards and assemblies are used in more than one model. Therefore, the parts lists on the following pages are listed under these headings:

PC2R/PC2/PC2X All Models

PC2/PC2X Keyboard Models

PC2R Rack Model

The following two tables list the printed circuit boards and assemblies by model.

Note: The PC2 and PC2X have been combined as these two models share most printed circuit boards and assemblies in common. The exceptions are the parts lists for the Final and Keyboard Assemblies.

PC2/PC2X Printed Circuit Boards and Assemblies

Part No. Description Page

N012000150 Final Assembly, PC2 page 6-9

N012000151 Final Assembly, PC2X page 6-11

N012103800 LCD Board page 6-8

N012300051 Engine Board page 6-3

N012300053 Pitch & Mod Wheel Assembly page 6-8

N012300061 Connector Board page 6-6

N012400051 Slider Board page 6-9

N012400052 Front Panel Board page 6-5

N215040311 Keyboard TP-8R AFT 76 Note page 6-10

N215040413 Keyboard TP-10MDF AFT 88 Note page 6-12

Page 88

Parts Lists

Introduction

PC2R Printed Circuit Boards and Assemblies

Part No. Description Page

N012000153 Final Assembly page 6-16

N012103802 LCD Board page 6-15

N012300040 Connector Board page 6-13

N012300051 Engine Board page 6-3

N012300070 Front Panel Assembly page 6-14

N012300080 Left Front Panel Board page 6-14

N012300090 Right Front Panel Board page 6-15

N012700019 Headphone/Volume/Power Switch Board page 6-15

6-2

Page 89

PC2R/PC2/PC2X

Engine Board, N012300051

Part No. Description Qty. Reference Designation

N035040201 BATTERY HOLDER TOSHIBA (BV-32) PC-88 1 J411

N041010401 SHUNTS JUMPER 2mm DIGI-KEY SPE1302-ND 1 @JP1

N041021264 SOCKET SIMM 22.5D TIN 64P LEFT METAL 2 J409, 410

N041025308 HEADER .156” SP 8P (09-65-2088) 1 J402

N041030040 HEADER 2mm SQR 3P R/A SAMTEC 1 JP1

N041030124 HEADER DUAL 2.0mm 24P MOLEX 87089-2416 1 J408

N041030150 HEADER DUAL 0.1" SQR 50POS DIGIKEY 1 J404

N041031210 CONN .1" SP DUAL ROW 14P (057-014-153) 1 J406

N041032305 CONN WIRE TRAP 2.00mmSP 5P (52147-0510) 1 J412

N041032310 CONN WIRE TRAP 2.00mmSP 10P (52147-1010) 1 J403

N041034002 HEADER .098" SP 2P (22-03-5025) 1 J405

N042005422 JUMPER WIRE 2.5MM 1 JP2 PINS 1 & 2

N051102103 RELAY 5V DPDT (G6H-2-DC5) 2 RY1-2

N064003502 IC LINEAR +5V LM78M05 500mA TO-220 1 VR1

N051064004 RES TF 47Ω 5% 1/16W 0603 T&R 4 R1, 26, 27, 39

N051064010 RES TF 100Ω 5% 1/16W 0603 T&R 1 R38

N051064011 RES TF 110Ω 5% 1/16W 0603 T&R 1 R28

N051064015 RES TF 1.5KΩ 5% 1/16W 0603 2 R64, 65

N051064025 RES TF 330Ω 5% 1/16W 0603 1 R32

N051064100 RES TF 1KΩ 5% 1/16W 0603 T&R 4 R5, 8, 34, 68

N051064109 RES TF 1MΩ 5% 1/16W 0603 T&R 2 R15, 16

N051064110 RES TF 10KΩ 5% 1/16W 0603 T&R 10 R7, 14, 17-18, 23-25, 29, 36-37

N051064130 RES TF 1.3KΩ 5% 1/16W 0603 T&R 1 R4

N051064220 RES TF 2.2KΩ 5% 1/16W 0603 T& 2 R6, 9

N051064470 RES TF 4.7KΩ 5% 1/16W 0603 T&R 3 R2, 10, 30

N051064472 RES TF 470Ω 5% 1/16W 0603 2 R31, 33

N051064820 RES TF 820Ω 5% 1/16W 0603 1 R3

N051066124 RES TF 1.24KΩ 1% 1/16W 0603 4 R60, 61, 66, 67

N051066453 RES TF 453Ω 1% 1/16W 0603 4 R56, 57, 62, 63

N051066464 RES TF 464Ω 1% 1/16W 0603 4 R48-51

N051066475 RES TF 475Ω 1% 1/16W 0603 4 R52-55

N051066487 RES TF 487Ω 1% 1/16W 0603 4 R40-43

N051066499 RES TF 499Ω 1% 1/16W 0603 4 R44-47

N051100010 RES NET QUAD ISO 10KΩ 5% 1/16W 11 RP1-4, 6-12

N051100047 RES NET QUAD ISO 47Ω 5% 1/16W 9 RP13-21

N051101701 RES TF 36Ω 5% 1/8W 1206 1 R35

N051101706 RES CF 47Ω 5% 1/8W 1206 1 R70

N051130082 RES TF 8.2Ω 5% 1/4W 1210 1 R13

N051130220 RES TF 220Ω 5% 1/4W 1210 2 R19, 21

N051130330 RES TF 330Ω 5% 1/4W 1210 2 R20, 22

N052007006 CAP CER NPO 6.8PF 50V 5% 1206 2 C11, 13

Parts Lists

PC2R/PC2/PC2X

6-3

Page 90

Parts Lists

PC2R/PC2/PC2X

Part No. Description Qty. Reference Designation

N052007406 CAP CER N90 2200PF 50V 5% 1206 4 C71, 72, 75, 76

N052007503 CAP CER X7R 0.1UF 50V 10% 1206 46 C5, 615-38, 41-43, 47, 60-63, 69, 70, 73, 74, 77-81, 86, 87, 91

N052007809 CAP CER NPO 100PF 50V 5% 0603 1 C1

N052007833 CAP CER NPO 33PF 50V 5% 0603 4 C9, 10, 12, 14

N052080010 CAP CER NPO 1000PF 50V 5% 0805 2 C2, 7

N052900747 CAP ELE GP 47UF 35V SZE SMT 5 C48-51, 68

N052901610 CAP ELECT GP 10UF 16V 20% SZB SMT 8 C39, 44-46, 64-67

N052901622 CAP ELCCT GP 220UF 10V 20% SZE SMT 1 C3

N052902522 CAP ELECT GP 22UF 35V 20% SZD SMT 1 C40

N053000703 DIODE RECT GP SMT 1A S1A SMA 1N4001 1206 1 D5

N053000802 DIODE SWITCH 1N4148 SMT DL-35 2 D2, 3

N054000102 TRANSISTOR KST3904 SOT-23 1 Q1

N054000802 TRANSISTOR MMBT2222L SOT-23 1 Q2

N054002906 TRANSISTOR MMBT2907L SOT-23 2 Q3, 4

N055001505 IND FE BD 2.5-TURN SMT 2 L1, 2

N055001509 IND FE BD SMT 200mA 600Ω 100MHZ 0805 2 R11, 12

N059010060 XTL 20.0000MHz +/-50PPM FND PAR 18PF SMT 1 Y1

N059010061 XTL 24.576MHz +/-50PPM FND FAR 18PF SMT 1 Y2

N061000802 IC LOGIC FAIRCHILD (TI) SN74AHCIGO8DBVR 3 U3, 4, 18

N061000912 IC LOGIC INV TINY UHS UNBUF SOT23-5 2 U12, 13

N061007139 IC LOGIC 74VHC139 SOP16 1 U10

N061007144 IC LOGIC 74VHC14 SOP14-150 1 U1

N061011008 IC LOGIC 74AC08 SOP14-150 2 U6, 14

N061011245 IC LOGIC 74HC245 SOP20 1 U8

N062004905 IC IF UART ST16C550 W/FIFO'S PLCC 44P 1 U22

N062004913 IC IF DAC AK4393VF DL 24B DS +5VS VSOP28 1 U23

N062005525 IC MEM FLSH ROM 1MX16 70nS SSOP56-525 5V 1 U5

N062005704 IC GAL 16V8A-15QJ SMT PLCC20 1 U21

N062100410

N062100416 IC MEMORY DRAM 1MX16 70nS(max) SOJ42 2 U16, 17

N064003508 IC ANA OPAMP DL BIP LO-NOIS NE5532A 4 U24-27

N083016001 IC MASKROM PC2 BASE HI 830160-001 1 U19

N083016101 IC MASKROM PC2 BASE LO 830161-001 1 U20

N252007456 CAP CER NPO 5600PF 50V 5% 1206 8 C52-59

N253000702 DIODE SHTKY SIG 5NS LO-C SL BAS40 SOT-23 2 D1, 4

N262001301 IC MC 68331CPV25 MOTOROLA 1 U2

N266000412 IC CUSTOM MABEL-2 2 U9, 11

N266000801 IC LISA VY06514 PLCC84 1 U15

N035040105 BATTERY COINCELL 3V 195mah CR2032 TOSHIBA 1

IC MEM SRAM 256kX16 55nS TSOP44-400 LO\ PWR

1U7

6-4

Page 91

PC2/PC2X

Front Panel Board, N012400052

Part No. Description Qty. Reference Designation

N032009401 FRONT PANEL PCB SUPPORT BRACKET PC-88 1

N035026011 BUTTON SM W/LED (3GANG) 5

N035026012 BUTTON SM W/LED RED PC2/X 1

N035026101 BUTTON LG W/LED PC-88 13

N035026141 BUTTON LG W/LED (1,2,3,4) PC2/X 1

N035026142 BUTTON LG W/LED (5,6,7,8) PC2/X 1

N035026143 BUTTON LG W/LED (9,10,11,12) PC2/X 1

N035026144 BUTTON LG W/LED (13,14,15,16) PC2/X 1

N035026145 BUTTON LG NO LED(3) (1,2,3) PC2/X 1

N035026146 BUTTON LG NO LED(3) (4,5,6) PC2/X 1

N035026147 BUTTON LG NO LED(3) (7,8,9) PC2/X 1

N035026148 BUTTON LG NO LED(3) (+/-,0,CLEAR) 1

N035026149 BUTTON LG NO LED(1) (CANCEL) PC2/X 1

N035026150 BUTTON LG NO LED(1) (ENTER) PC2/X 1

N035026151 BUTTON LG W/LED (SOLO) PC2/X 1

N035026152 BUTTON LG W/LED (EQ) PC2/X 1

N035026153 BUTTON LG W/LED (SW1) PC2/X 1

N035026154 BUTTON LG W/LED (SW2) PC2/X 1

N035026155 BUTTON LG W/LED (SW3) PC2/X 1

N035026156 BUTTON LG W/LED (SW4) PC2/X 1

N035026157 BUTTON LG W/LED (SW5) PC2/X 1

N035026217 BUTTON LG NO LED 6

N035026611 LCD SUPPORT BEZEL 1

N035026711 SPIN KNOB BEZEL 1

N041031220 HEADER .1” SP DUAL ROW 20P 1 J604

N041032205 CONN WIRE TRAP 2.00mmSP 5P R/A 1 J701

N041032305 CONN WIRE TRAP 2.00mmSP 5P R/A 1 J601

N041032308 CONN WIRE TRAP 2.00mmSP 8P 1 J602

N043003703 SWITCH TACT SPST 6mmX6mm 160GF 72 S1-72

N044010501 ENCODER 36 STEP 2BIT 1 SP1

N045010111 LED T1 RED HI EFF DIFFUSED LTL-422 49

N045010612 LED MINI GREEN DIFUSSED T1 3 D33, 41, 49

N051005010 RES CF 1Ω 5% 1/8W 1 R8

N051100102 RES CF 15Ω 5% 1/8W 7 R1-7

D1-7, 9-12, 14-16, 20-24, 26-29, 32, 34-38, 40, 42-44, 48, 50-53, 55-60, 63, 66-69

Parts Lists

PC2/PC2X

6-5

Page 92

Parts Lists

PC2/PC2X

Part No. Description Qty. Reference Designation

N051100157 RES CF 10KΩ 5% 1/8W 18 R9-26

N052001204 CAP CER MONO Z5U .1UF 50V 20% .3AX 3 C2-4

N054000801 TRANSISTOR PN2222 TO-92 7 Q1-7

N054001201 TRANSISTOR PNP KTA1271(KSA643CY) TO-9 10 Q8-17

N061000301 IC LOGIC 74LS145 DIP16-300 1 U2

N061014001 IC LOGIC 74HC541 DIP20 1 U1

N061020501 IC LOGIC 74HC373 DIP20 1 U3

N252003102 CAP ELECT ECE-BOJU471 470UF 6.3V VERT AX 2 C1, 6

Connector Board, N012300061

Part No. Description Qty. Reference Designation

RES TF 7.5KΩ 5% 1/8W 1206 1 R19

N025224508 TAPPING SCREW-2 BH 3.5X8 WHITE W/WASHER 3

N025323308 MACHINE SCREW BH M3X8 BLK 1

N032038811 BRACKET SUPPORT I/O PCB PC2/X 1

N032038816 BRACKET SUPPORT POWER JACK PC2/X 1

N032064801 EXTRUSION HEAT TRANSFER 1

N041006503 CONN PWR JACK 4P W/SHIELD UNITOP 1 J321

N041021903 JACK PHONE RCA TYPE TA PCMT 1 J300

N041025308 HEADER .156” SP 8P (09-65-2088) 1 J301

N041030033 MODULAR JACK 6P R/A AMP 555163-1 1 J316

N041030310 CONN MIDI JACK 3-GANG YKF 51-5041(JALCO) 1 J320

N041031220 HEADER .1” SP DUAL ROW 20P (057-020-153) 3 J304, 306, 307

N041032305 CONN WIRE TRAP 2.00mmSP 5P (52147-0510) 1 J302

N041032306 CONN WIRE TRAP 2.00mmSP 6P (52147-0610) 1 J308

N041032307 CONN WIRE TRAP 2.00mmSP 7P (52147-0710) 1 J305

N041032310 CONN WIRE TRAP 2.00mmSP 10P (52147-1010) 1 J303

N041034401 PHONE JACK MONO 1/4” RA49C-12A MONO 3 J317-319

N041034411 CONN STEREO 1/8” W/SWITCH UNITOP 1 J315

N041034501 PHONE JACK STEREO 1/4” RA49C-14B 5 J310-314

N043003702 SWITCH POWER DPDT NKK M2022TXW30-DA 1 S2

N043010510 SWITCH SLIDER R/A 2.5mmSP SPDT 1 S1

N051064005 RES TF 56Ω 5% 1/16W 0603 4 R93, 96, 99, 102

N051064011 RES TF 110Ω 5% 1/16W 0603 12 R17, 20, 65, 68, 69, 73-75, 94, 95, 97, 98

N051064015 RES TF 1.5KΩ 5% 1/16W 0603 1 R22

N051064022 RES TF 220Ω 5% 1/16W 0603 4 R100, 101, 126, 128

N051064110 RES TF 10KΩ 5% 1/16W 0603 21 R1-3, 9, 10, 12-14, 24, 70, 77, 84-86, 108, 109, 121, 144, 146, 147, 149

N051064150 RES TF 150Ω 5% 1/16W 0603 1 R81

N051064470 RES TF 470Ω 5% 1/16W 0603 1 R118

N051100010

N051100011 RES NET QUAD ISO 100Ω 5% 1/16W 8 RP1-8

N051101706 RES CF 47Ω 5% 1/8W 1206 2 R134, 137

N051101708 RES TF 56Ω 5% 1/8W 1206 2 R4, 5

RES NET QUAD ISO 10KΩ 5% 1/16W

3.2mmX1.6mm

5 RP9-13

6-6

Page 93

Part No. Description Qty. Reference Designation

N051101721 RES CF 270Ω 5% 1/8W 1206 2 R6, 83

N051101724 RES 470 5% 1/8W 1206 2 R18, 117

N051101730 RES CF 1.0KΩ 5% 1/8W 1206 3 R87, 120, 148

N051101734 RES TF 1.5KΩ 5% 1/8W 1206 1 R82

N051101738 RES CF 2.2KΩ 5% 1/8W 1206 2 R8, 66

N051101760 RES CF 20KΩ 5% 1/8W 1206 1 R80

N051101768 RES TF 680KΩ 5% 1/8W 1206 3 R76, 78, 79

N051101780 RES CF 100KΩ 5% 1/8W 1206 7 R7, 15, 88-91, 150

N051101783 RES TF 200KΩ 5% 1/8W 1206 1 R145

N051101790 RES CF 1.0MΩ 5% 1/8W 1206 5 R11, 16, 71, 72, 119

N051101794 RES CF 1.5MΩ 5% 1/8W 1206 1 R63

N051102302 POT R/A 10K 12RV03 (JUNG POONG) 1 R107

N051103073 RES CF 165KΩ 1% 1/8W 1206 1 R64

N051103121 RES TF 121KΩ 1% 1/8W 1206 1 R67

N051103151 RES TF 15.00KΩ 1% 1/8W 1206 8 R122, 123, 132, 133, 135, 136, 138, 142

N051120030 RES TF 3.0KΩ 5% 1/8W 1206 3 R106, 127, 129

N051125201 RES TF 200Ω 1% 1/4W 1210 4 R124, 130, 139, 141

N052001223 CAP CER MONO 0.22UF 50V 20% AX 1 C39

N052001712 CAP ELECT 1000UF 25V RAD 1 C30

N052002412 CAP ELECT 470UF 25V 20% .2SP 1 C31

N052007401 CAP CER NPO 100PF 50V 5% 1206 2 C46, 55

N052007503 CAP CER X7R 0.1UF 50V 10% 1206 21 C12, 13, 23, 24, 29, 32, 33, 35, 38, 41, 42, 44, 45, 48-54, 56

N052007810 CAP CER X7R 1000PF 50V 10% 0603 21 C1-3, 6, 8-11, 14-22, 25-27, 47

N052007833 CAP CER NPO 33PF 50V 5% 0603 2 C4, 5

N052901601 CAP ELECT GP 100UF 16V 20% SZC SMT 4 C28, 34, 36, 37

N052901602 CAP ELECT GP 0.197” SP RAD 1000UF 16V 20% 1 C40

N052901610 CAP ELECT GP 10UF 16V 20% SZB SMT 1 C7

N053000703 DIODE RECT GP SMT 1A S1A SMA 1N4001 1206 5 D12, 14, 15, 17, 22

N053000802 DIODE SWITCH 1N4148 SMT DL-35 14 D1-11, 13, 16, 21

N054000802 TRANSISTOR MMBT2222L SOT-23 4 Q2, 7, 9, 18

N054002906 TRANSISTOR MMBT2907L SOT-23 6 Q1, 3, 4, 8, 12, 13

N054010301 TRANSISTOR NPN KSC2331-Y 2 Q14, 15

N055001505 IND FE BD 2.5-TURN SMT 2 L3, 4

N055001509 IND FE BD SMT 200mA 600Ω 100MHz 0805 2 L1, 2

N059010010 XTL 12.2880MHz +/-50PPM FND PAR 18PF SMT 1 Y1

N061010302 IC LOGIC 74HCU04 SOP14 1 U5

N061014002 IC LOGIC 74HC4051 SOP16-200 1 U11

N061014003 IC LOGIC MC74HC541DW SOP-20 1 U2

N063002302 IC OPT COUPLER PC410 1 U7

N064001602 IC LINEAR OPAMP TL072 SOP8-160 1 U3

N064003508 IC ANA OPAMP DL BIP LO-NOIS NE5532A 1 U9

N064010031 IC COMPARATOR QUAD LM339 SOIC14/14W 1 U4

N064010804 IC LINEAR -12V LM79L12 SOP8 1 VR3

N064010805 IC LINEAR +5V KA78T05 5V 3A TO-220 1 VR1

N064010806 IC LINEAR +12V LM78M12 TO-220 1 VR2

N215000105 SCHOTT TRANSFORMER 67129600 1 L5

N262100608 IC MICROCONTROLLER M37451M8-731FP 1 U1

Parts Lists

PC2/PC2X

6-7

Page 94

Parts Lists

PC2/PC2X

LCD Board, N012103800

Part No. Description Qty. Reference Designation

N013040112 CABLE ENGINE TO LCD 14P RIBBON 1

N013042601 CABLE ENGINE TO LCD BACKLIGHT 2P PC2/X 1

N045010302 LCD UC-20212BLANO SAMSUNG PC-88/MX 1

Pitch & Mod Wheel Assembly, N012300053

Part No. Description Qty. Reference Designation

N013040122 CABLE POT TO WHEEL BD 3P #26 AWG 4 2

N041030007 HEADER 0.1” SP 4P (22-03-2041) 2 J202, 203

N041032306 CONN WIRE TRAP 2.00mmSP 6P (52147-0610) 1 J201

N051100118 RES CF 220Ω 5% 1/8W 2 R18, 19

N051100132 RES CF 1KΩ 5% 1/8W 1 R17

N051100310 RES MF 1KΩ 1% 1/8W 1 R12

N051100316 RES MF 1.5KΩ 1% 1/8W 1 R13

N051100336 RES MF 4.99KΩ 1% 1/8W 2 R16, 20

N051100354 RES MF 10KΩ 1% 1/8W 2 R9, 10

N051100379 RES 110K 1/8W 1% 2 R6, 7

N051100439 RES MF 30.1KΩ 1% 1/8W 3 R4, 5, 8

N051100850 RES MF 2.49KΩ 1% 1/8W 1 R11

N051101401 RES POT 100K 3/4 TURN 2 R14, 15

N051101410 RES TRIMPOT 50K 3/4 TURN 1 R3

N051102301 POT ROTARY 10K (K2000) 2 R1, 2

N052001204 CAP CER MONO Z5U .1UF 50V 20% .3AX 6 C1-6

N064001903 IC LINEAR OPAMP TLC2272CP DIP8 3 U1-3

N025223410 TAPPING SCREW-2 BH 3X10 BLK 1

N025224414 TAPPING SCREW-2 BH 3X14 BLK 2

N031053800 BRACKET MOUNTING PITCH & MOD WHEEL PC2 1

N032021811 BUSHING 8.0X26 K2000 1

N032021911 SPRING TORSION MUSIC WIRE 1

N035020311 PITCH & MOD WHEEL 35 2

N035027013 PITCH & MOD WHEEL CHEEK 1

6-8

Page 95

Slider Board, N012400051

Part No. Description Qty. Reference Designation

N035026158 BUTTON LG W/LED (ZONE1,3,4) PC2 4

N035026321 SLIDER KNOB PC-88 5

N035026411 SLIDER BEZEL PC-88 5

N039000701 SLIDE VOLUME FELT 0.3TX12X70 5

N041032307 CONN WIRE TRAP 2.00mmSP 7P (52147-0710) 1 J101

N041032308 CONN WIRE TRAP 2.00mmSP 8P (52147-0810) 1 J102

N043003703 SW TACT SPST 6mmX6mm 160GF ALPS SKHWAC 4 S1-4

N045010610 LED MINI RED/GREEN DIFUSSED T1 DKL-30RGM 4 D1-4

N051101502 SLIDER VOLUME SINGLE 10KB-LIN 45mm 5 R1-5

N053000801 DIODE 1N4148 DO-35 4 D5-8

PC2

Parts Lists

PC2

Final Assembly, N012000150

Part No. Description Qty. Reference Designation

E207407181 DOUBLE SIDE TAPE 3M (5MMX50M) #467 0.01

N013030951 CABLE TIE 13

N013041601 CABLE SLIDER TO FRONT PANEL 8P PC2/X 1

N013041701 CABLE SLIDER TO CONN BD 7P PC2/X 1

N013041801 CABLE ENGINE TO CONN BD 10P PC2/X 1

N013041901 CABLE ENGINE TO CONN BD 5P PC2/X 1

N013042001 CABLE WHEEL TO CONN BD 6P PC2/X 1

N013042101 CABLE BUTTON BD TO FRONT PANEL 5P PC2/X 1

N013042201 CABLE ENGINE TO CONN BD POWER PC2/X 1

N013042301 CABLE KEYBOARD BASS & TREBLE PC2/X 1

N013042302 CABLE KEYBOARD BASS PC2 1

N013042401 CABLE FRONT PANEL TO CONN BD PC2/X 1

N015048232 FELT 2TX20X1200 BLK KEYBOARD K2500/S 1

N022002703 SPACER PUSH LOCKING 8.0MM TALL 4

N022003714 CABLE CLAMP 14P 1

N022003720 CABLE CLAMP 20P 4

N025153512 TAPPING SCREW-1 TH 3.5X12 BLK 8

N025153520 TAPPING SCREW-1 TH 3.5X20 BLK 16

N025224508 TAPPING SCREW-2 BH 3.5X8 WHITE W/WASHER 35

N025323408 MACHINE SCREW BH M4X8 BLK 35

N025323410 MACHINE SCREW BH M4X10 BLK 4

N025323414 MACHINE SCREW BH 4X14 BLK 2

N025328310 MACHINE SCREW BH 3X10 BLK W/WASHER 4

N032033632 BOTTOM PC2 1

N032037732 LEFT SUPPORT WALL PC2/X 1

N032037822 RIGHT SUPPORT WALL PC2/X 1

6-9

Page 96

Parts Lists

PC2

Part No. Description Qty. Reference Designation

N032038813 CLAMP PCB PC2/X 5

N032038814 BRACKET CLAMPING ENCLOSURE TOP PC2/X 2

N032038815 BRACKET LOCKING ENDCAP PC2/X 2

N032038950 SPACER (BLK) 2

N032059011 PLATE COVER PCB PC2/X 1

N035020711 KNOB ENCODER 52 1

N035026511 LCD DISPLAY LENS PC-88 1

N039004322 CABLE MOUNT BASE (DAMD-10) 9

N125223408 TAPPING SCREW-2 BH 3X8 BLK (PLASTIC) 4

N125223410 TAPPING SCREW-2 BH 3X10 AN (PLASTIC) 2

N032033521 TOP COVER PC2 1

N039040004 BUMPON 3M 4

N052001022 ADAPTER 1

N035027013 CHECK PITCH & MOD WHEEL 1

N032033713 ENDCAP LEFT 1

N032033813 ENDCAP RIGHT 1

N125223408 TAPPING SCREW-2 BH 3X8 BLK (PLASTIC) 14 FOR ENDCAPS

N215040311 KEYBOARD TP-8R AFT STRIP 76 NOTE 1

Keyboard Assembly, N215040311

Part No. Description Qty. Reference Designation

PCB KEY CONTACT LOW

PCB KEY CONTACT HIGH

KEY CONTACT STRIP (12 NOTE)

BRACKET ROD/KEY WEIGHT SUPPORT 12 PO

KEY PIVOT

BRACKET ROD/KEY WEIGHT SUPPORT 4 POS

KEY NATURAL A

KEY NATURAL B

KEY NATURAL C

KEY NATURAL D

KEY NATURAL E

KEY NATURAL F

KEY NATURAL G

KEY NATURAL LOW A

KEY NATURAL HIGH C

KEY SHARP

KEY WEIGHT NATURAL

KEY WEIGHT SHARP

FELT RED

AFTER TOUCH STRIP

6-10

Page 97

PC2X

Final Assembly N012000151

Part No. Description Qty. Reference Designation

E207407181 DOUBLE SIDE TAPE 3M(5MMX50M)#4670.01

N013030951 CABLE TIE 13

N013041601 CABLE SLIDER TO FRONT PANEL 8P PC2/X 1

N013041701 CABLE SLIDER TO CONNECTOR BD 7P PC2/X 1

N013041801 CABLE ENGINE TO CONNECTOR BD 10P PC2/X 1

N013041901 CABLE ENGINE TO CONNECTOR BD 5P PC2/X 1

N013042001 CABLE WHEEL TO CONNECTOR BD 6P PC2/X 1

N013042101 CABLE BUTTON BD TO FRONT PANEL 5P PC2/X 1

N013042201 CABLE ENGINE TO CONN BD POWER PC2/X 1

N013042301 CABLE KEYBOARD BASS & TREBLE PC2/X 1

N013042303 CABLE KEYBOARD BASS PC2X 1

N013042401 CABLE FRONT PANEL TO CONNECTOR B/D PC2/X 1

N015047014 FELT (W/ ONE SIDE ADHESIVE) 1TX10X1000 BLK 2

N015048236

N022002703 SPACER PUSH LOCKING 8.0MM TALL 4

N022003714 CABLE CLAMP 14P 1

N022003720 CABLE CLAMP 20P 4

N025224508 TAPPING SCREW-2 BH 3.5X8 WHITE W/WASHER 35

N025226508 TAPPING SCREW-2 BH 3.5X8 BLK W/WASHER 2

N025323312 MACHINE SCREW BH 3X12 BLK 1

N025323408 MACHINE SCREW BH M4X8 BLK 35

N025323410 MACHINE SCREW BH M4X10 BLK 4

N025323414 MACHINE SCREW BH 4X14 BLK 2

N025328310 MACHINE SCREW BH 3X10 BLK W/WASHER 4

N025328610 MACHINE SCREW BH 4X10 W/SFWASHER BLK 8

N032033633 BOTTOM PC2X 1

N032037732 LEFT SUPPORT WALL PC2/X 1

N032037822 RIGHT SUPPORT WALL PC2/X 1

N032038813 CLAMP PCB PC2/X 5

N032038814 BRACKET CLAMPING ENCLOSURE TOP PC2/X 2

N032038815 BRACKET LOCKING ENDCAP PC2/X 2

N032038950 SPACER (BLK) 2

N032059011 PLATE COVER PCB PC2/X 1

N035020711 KNOB ENCODER 1

N035026511 LCD DISPLAY LENS PC-88 1

N039004322 CABLE MOUNT BASE (DAMD-10) 9

N125223408 TAPPING SCREW-2 BH 3X8 BLK (PLASTIC) 4

N032033522 TOP COVER PC2X 1

FELT 2TX17X1300 BLK KRYBOARD K2500X/XS/AES

Parts Lists

PC2X

6-11

Page 98

Parts Lists

PC2X

Part No. Description Qty. Reference Designation

N039040004 BUMPON 3M 4

N052001022 ADAPTER 1

N035027013 CHECK PITCH & MOD WHEEL 1

N032033713 ENDCAP LEFT 1

N032033813 ENDCAP RIGHT 1

N125223408 TAPPING SCREW-2 BH 3X8 BLK (PLASTIC) 14 FOR ENDCAPS

N125223410 TAPPING SCREW-2 BH 3X10 AN (PLASTIC) 2

N215040413 KEYBOARD TP-10MDF AFT (ABS) 1

Keyboard Assembly, N215040413

Part No. Description Qty. Reference Designation

PCB KEY CONTACT LOW

PCB KEY CONTACT HIGH

KEY CONTACT STRIP (12 NOTE)

BRACKET ROD/KEY WEIGHT SUPPORT 12 POS

KEY PIVOT

BRACKET ROD/KEY WEIGHT SUPPORT 4 POS

KEY NATURAL A

KEY NATURAL B

KEY NATURAL C

KEY NATURAL D

KEY NATURAL E

KEY NATURAL F

KEY NATURAL G

KEY NATURAL LOW A

KEY NATURAL HIGH C

KEY SHARP

KEY WEIGHT NATURAL

KEY WEIGHT SHARP

FELT RED

AFTER TOUCH STRIP

6-12

Page 99

PC2R

Connector Board, N01230004

Part No. Description Qty. Reference Designation

RES TF 7.5KΩ 5% 1/8W 1206 1 R19

N041006503 CONN PWR JACK 4P W/SHIELD UNITOP 1 J321

N041021903 JACK PHONE RCA TYPE TA PCMT 1 J300

N041025308 HEADER .156" SP 8P (09-65-2088) 1 J301

N041030326 HEADER .1" SP DUAL ROW 26P (057-026-153) 1 J304

N041031104 JACK 1/4" STEREO (EPJ-BBB-P) BELTON 2 J311-312

N041032305 CONN WIRE TRAP 2.00mm SP 5P (52147-0510) 1 J302

N041032310 CONN WIRE TRAP 2.00mmSP 10P (52147-1010) 1 J303

N041034010 HEADER .098" SP 10P (22-03-5105) 1 J322

N041034031 CONN MIDI TRIPLE R/A PCMT (YKF51-5046) 1 J320

N043010510 SWITCH SLIDER R/A 2.5mmSP SPDT 1 S1

N051064005 RES TF 56Ω 5% 1/16W 0603 T&R 4 R93, 96, 99, 102

N051064011 RES TF 110Ω 5% 1/16W 0603 T&R 6 R17, 20, 94-95, 97-98

N051064016 RES TF 1.6KΩ 5% 1/16W 0603 1 R118

N051064022 RES TF 220Ω 5% 1/16W 0603 2 R100-101

N051064110 RES TF 10Ω 5% 1/16W 0603 T&R 13 R1-3, 12, 14, 24, 108-109, 121, 126, 128, 144, 147

N051100010 RES NET QUAD ISO 10KΩ 5% 1/16W 4 RP9-12

N051100011 RES NET QUAD ISO 100Ω 5% 1/16W 3 RP6-8

N051101706 RES CF 47Ω 5% 1/8W 1206 2 R134, 137

N051101708 RES CF 56Ω 5% 1/8W 1206 2 R4-5

N051101721 RES CF 270Ω 5% 1/8W 1206 1 R6

N051101724 RES 470 5% THICK FILM 1206 2 R18, 117

N051101730 RES CF 1.0KΩ 5% 1/8W 1206 2 R120, 148

N051101734 RES TF 1.5KΩ 5% 1/8W 1206 1 R22

N051101780 RES CF 100KΩ 5% 1/8W 1206 1 R15

N051101790 RES CF 1.0MΩ 5% 1/8W 1206 3 R11, 16, 119

N051102103 RELAY 5V DPDT (G6H-2-DC5) 1 RY1

N051103151 RES TF 15.00KΩ 1% 1/8W 1206 8 R122-123, 132-133, 135-136, 138, 142

N051120030 RES TF 3.0KΩ 5% 1/8W 1206 3 R106, 127, 129

N051120056 RES TF 5.6KΩ 5% 1/8W 1206 1 R8

N051125201 RES TF 200Ω 5% 1/4W 1210 4 R124, 130, 139, 141

N052001204 CAP CER MONO Z5U 0.1UF 50V 20% 3AX 3 C1-3

N052001223 CAP CER MONO 0.22UF 50V 20% AX 1 C39

N052001711 CAP ELECT 100UF 25V 20% RAD 4 C28, 34, 36, 37

N052001712 CAP ELECT 1000UF 25V RAD 1 C30

N052002412 CAP ELECT 470UF 25V 20% .2SP 1 C31

N052007401 CAP CER NPO 100PF 50V 5% 1206 2 C46, 55

N052007503 CAP CER X7R 0.1UF 50V 10% 1206 16 C29, 32-33, 35, 38, 41-42, 44-45, 49-54, 56

N052007810 CAP CER X7R 1000PF 50V 10% 0603 10 C17-22, 25-27, 47

N052007833 CAP CER NPO 33PF 50V 5% 0603 2 C4-5

N052901602 CAP ELECT GP 0.197" SP RAD 1000UF 16V 20% 1 C40

Parts Lists

PC2R

6-13

Page 100

Parts Lists

PC2R

Part No. Description Qty. Reference Designation

N053000703 DIODE RECT GP SMT 1A S1A SMA 1N4001 1206 4 D14-15, 17, 22

N053000802 DIODE SWITCH 1N4148 SMT DL-35 2 D13, 21

N054000802 TRANSISTOR MMBT2222L SOT-23 3 Q7, 9, 18

N054002906 TRANSISTOR MMBT2907L SOT-23 4 Q4, 8, 12-13

N054010301 TRANSISTOR NPN KSC2331-Y 2 Q14-15

N055001505 IND FE BD 2.5 TURN SMT 4 L1-4

N059010010 XTL 12.2880MHz +/-50PPM FND PAR 18PF SMT 1 Y1

N061010302 IC LOGIC 74HCU04 SOP14 1 U5

N061014002 IC LOGIC 74HC4051 SOP16-200 1 U11

N063002302 IC OPT COUPLER PC410 SOP6-170 1 U7

N064003508 IC ANA OPAMP DL BIP LO-NOIS NE5532A 1 U9

N064010804 IC LINEAR -12V LM79L12 SOP8 1 VR3

N064010805 IC LINEAR +5V KA78T05 5V 3A TO-220 1 VR1

N064010806 IC LINEAR +12V LM78M12 TO-220 1 VR2

N215000105 SCHOTT TRANSFORMER 67129600 1 L5

N262100608 IC MICROCONTROLLER M37451M8-731FP 1 U1

Front Panel Assembly, N012300070

Part No. Description Qty. Reference Designation

N025323306 MACHINE SCREW BH 3X6 BLK 7 BRACKET CLAMPING PCB & FRONT LEFT & RIGHT

N025383306 MACHINE SCREW FH M3X6 (SMALL) 4 FRONT PANEL & BRACKET CLAMPING PCB

N031063100 BRACKET CLAMPING PCB PC2R 1

N035033900 LCD DISPLAY LEN PC2R 1

N032027426 FRONT PANEL PC2R 1

Left Front Panel Board, N012300080

Part No. Description Qty. Reference Designation

N013035412 CABLE FRONT PANEL PC2R 200mm 1

N041030036 HEADER 16P PICOFLEX MOLEX 90325-0016 1 J603

N041034002 HEADER .098" SP 2P (22-03-5025) 1 J604

N043003704 SW TACT SPST 6mmX6mm 160gf ALPS SKHHDA 6 S15-20

N045010111 LED T1 RED HI EFF DIFFUSED LTL-4221 1 D10

N045010610 LED MINI RED/GREEN DIFUSSED T1 DKL-30RGM 5 D11, 13, 15, 17, 19

N035033800 KEYCAP W/LED PC2R 6 @15-20

N051102304 POT 10K 15mmLx6mmD FLAT ELEC 4 R19-22

N035025813 POWER SWITCH VOLUME KNOB PC2R 4 @R19-22

N051101702 RES CF 15Ω 5% 1/8W 1206 2 R17, 18

N052007503 CAP CER X7R 0.1UF 50V 10% 1206 1 C7

N053000802 DIODE SWITCH 1N4148 SMT DL-35 4 D12, 14, 16, 18

N054000802 TRANSISTOR MMBT2222L SOT-23 2 Q9-10

6-14

KURZWEIL PC2 Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual

PC2 Series

Service Manual

IMPORTANT SAFETY & INSTALLATION INSTRUCTIONS

INSTRUCTIONS PERTAINING TO THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS

3. This product should be used only with a stand or cart that is recommended by the manufacturer.

A. The power supply cord or the plug has been damaged;

C. The product has been exposed to rain;

E. The product has been dropped, or the enclosure damaged.

RADIO AND TELEVISION INTERFERENCE

SAVE THESE INSTRUCTIONS

Young Chang Distributors

A N D Music Corp.

Young Chang Akki Co., Ltd.

Young Chang America, Inc. (Canadian Division)

Contents

Chapter 1 Introduction

Chapter 2 Diagnostics

Chapter 3 PC2R Disassembly/Assembly

Chapter 4 PC2/PC2X Disassembly/Assembly

Chapter 5 Troubleshooting

Chapter 6 Parts Lists

Chapter 7 Schematics

Models

There are three models in the PC2 series. The available models are listed below.

• PC2, 76-note keyboard

• PC2X, 88-note keyboard

• PC2R, rack-mount

Notes, Cautions, Warnings

A brief description of these symbols follows:

PC2/PC2X

PC2/PC2X Rear Panel

Figure 1-1 PC2 rear panel features

Rear Panel Features

Power Switch—Rocker switch to turn the power on and off.

Power Connector—Keyed four-pin connector to attach the Kurzweil 9VDC power adapter.

LCD Contrast—Rotary potentiometer to adjust the LCD for the best visibility.

Digital Out—RCA jack to connect to digital recorders and mixers.

Breath Input—A 3.5mm jack to connect a standard breath controller.

Ribbon Input—Modular jack to connect the Kurzweil Ribbon Controller option.

Headphones—Standard 1/4” jack to connect headphones.

PC2/PC2X Front Panel

Figure 1-2 PC2/PC2X Front Panel layout

Front Panel Features

Figure 1-3 Master Volume, Zone Select and Assignable Controllers section

Master Volume—Slidepot to adjust the overall volume.

Figure 1-4 PC2 Front Panel, center section

LCD—Forty-character, two-line liquid crystal display.

Figure 1-5 Sound/Setup Select and Effects and Reverb sections

Figure 1-6 Data Entry section

PC2R

PC2R Rear Panel

Figure 1-7 PC2R rear panel

Rear Panel Features

Digital Out—RCA jack to connect to digital recorders and mixers.

MIDI Select Switch—Slide switch to select the operation of the MIDI Thru/Out port.

Power In—Keyed four-pin connector to attach the Kurzweil 9VDC power adapter.

PC2R Front Panel

Figure 1-8 PC2R Front Panel

Front Panel Features

Power/Volume—Push to turn the power on/off and turn it to adjust the volume.

Headphones—Standard 1/4” jack to connect headphones.

Figure 1-9 Power/Volume, Headphones and Performance section

MIDI Setups mode (Zone 3), selecting the Split button selects Zone 3.

Figure 1-10 Edit section

Figure 1-11 Modes section and LCD Contrast

LCD Contrast—Rotary potentiometer to adjust the LCD for the best visibility.

Diagnostic Tests

The following lists the diagnostic tests available for the PC2 Series.

• ROM

• Read-write

• RAM

• MABEL

• LISA

• Sound ROM

• ZRAM

• MIDI