KURZWEIL PC2 Schematic

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

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.

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

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

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

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

iii

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

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

Kurzweil PC2 Series Service Manual

Contents

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

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.

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

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.

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.

1-5

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

1-6

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

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.

1-7

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.

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.

2-1

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

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.

2-3

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.

2-4

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.

2-5

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.

2-6

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

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.

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.

3-3

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.

3-4

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.

3-5

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.

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