Sony MZE-90 Service manual

MZ-E90

SERVICE MANUAL

Ver 1.0 1999. 11

(Photo: Silver)

US and foreign patents licensed from Dolby Laboratories Licensing Corporation.

SPECIFICATIONS

System

Audio playing system

MiniDisc digital audio system

Laser diode properties

Material: GaAlAs Wavelength: λ = 790 nm Emission duration: continuous Laser output: less than 44.6 µW (This output is the value measured at a distance of 200 mm from the objective lens surface on the optical pick-up block with 7 mm aperture.)

Revolutions

600 rpm to 2250 rpm

Error correction

Advanced Cross Interleave Reed Solomon Code (ACIRC)

Sampling frequency

44.1 kHz

Coding

Adaptive TRansform Acoustic Coding (ATRAC)

Modulation system

EFM (Eight to Fourteen Modulation)

Number of channels

2 stereo channels 1 monaural channel

Frequency response

20 to 20,000 Hz ± 3 dB

Wow and Flutter

Below measurable limit

Outputs

Headphones: stereo mini-jack, maximum output level 5 mW + 5 mW, load impedance 16 ohm

E Model

Tourist Model

Model Name Using Similar Mechanism NEW MD Mechanism Type MT-MZE90-166 Optical Pick-up Mechanism Type LCX-2E

General

Power requirements

Nickel metal hydride rechargeable battery NH-14WM (supplied) One LR6 (size AA) battery (not supplied) Sony AC Power Adaptor AC-E15L* (not supplied) connected to the DC IN 1.5V jack

Battery operation time Battery life*

Batteries Playback Ni-MH Approx. 21 hours** rechargeable battery (NH-14WM) One LR6 (size AA) Approx. 31 hours alkaline battery One LR6 (size AA) Approx. 56 hours** alkaline battery and a Ni-MH rechargeable battery (NH-14WM)

* The battery life may be shorter depending on

operating conditions and the temperature of the location.

** With a fully charged battery

– Continued on next page –

MICROFILM

PORTABLE MINIDISC PLAYER

– 1 –

Dimensions

Approx. 78.4 × 13.5 × 71.5 mm (w/h/d) (3 1/8 × 9/16 × 2 7/8 in.) not including projecting parts and controls

Mass

Approx. 70 g (2.5 oz.) the player only Approx. 113 g (4.0 oz.) incl. a premastered MD and a nickel metal hydride rechargeable battery NH-14WM

Supplied accessories

Battery Charger (1) Rechargeable battery (1) Rechargeable battery carrying case (1) Headphones with a remote control (1) Dry battery case (1) Carrying pouch (1) AC Plug Adaptor (1) (World model only)

Design and specifications are subject to change without notice.

Precautions for Laser Diode Emission Check

When checking the emission of the laser diode during adjustments, never view directly downwards as this may lead to blindness.

Precautions for Using Optical Pick-up (LCX-2E)

As the laser diode inside the optical pick-up damages by static electricity easily, solder the laser tap of the Optical pick-up flexible board when handling. Also take the necessary measures to prevent damages by static electricity. Handle the Optical pickup flexible board with care as it breaks easily.

This MiniDisc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the bottom exterior.

IN NO EVENT SHALL SELLER BE LIABLE FOR ANY DIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY NATURE, OR LOSSES OR EXPENSES RESULTING FROM ANY DEFECTIVE PRODUCT OR THE USE OF ANY PRODUCT.

“MD WALKMAN” is a trademark of Sony Corporation.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270°C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

Laser tap

Optical Pick-up flexible board

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

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TABLE OF CONTENTS

1. SERVICING NOTE......................................................... 4

2. GENERAL.........................................................................5

Playing an MD right away! ................................................... 5

3. DISASSEMBLY ............................................................... 7

3-1. Lid Assy, Upper .................................................................... 7

3-2. Holder Assy...........................................................................7

3-3. Mechanism Deck .................................................................. 8

3-4. System Board ........................................................................ 8

3-5. “Plate (L) Assy, Fulcrum”, “Plate (R) Assy, Fulcrum”.........9

3-6. SW Board, Main Board ........................................................ 9

3-7. Service Assy, OP ................................................................. 10

4. TEST MODE................................................................... 11

4-1. General ................................................................................ 11

4-2. Setting the TEST MODE .................................................... 11

4-2-1. How to Set the TEST MODE ...................................... 11

4-2-2. Operations when the TEST MODE is set ................... 11

4-2-3. How to release the TEST MODE ................................ 11

4-3. Test Mode Structure............................................................11

4-4. Manual Mode ...................................................................... 12

4-4-1. Outline of the function ................................................ 12

4-4-2. How to set the Manual Mode ...................................... 12

4-5. Overall Adjustment Mode ................................................... 12

4-5-1. Outline of the Function ............................................... 12

4-6. Self-diagnostic Display Mode ............................................ 12

4-6-1. Outline of the Function ............................................... 12

4-6-2. Self diagnostic Mode ................................................... 13

4-6-3. Clearing the Error Display Code ................................. 13

4-7. Key Check Mode ................................................................ 14

4-7-1. Outline of the Function ............................................... 14

4-7-2. Setting the Key Check Mode ....................................... 14

6. DIAGRAMS..................................................................... 18

6-1. IC Pin Descriptions ............................................................. 18

6-1-1. IC801 CXR701080-006GA (System Control) ............ 18

6-2. Block Diagrams .................................................................. 21

6-2-1. MD Block Diagram ..................................................... 21

6-2-2. Servo Block Diagram .................................................. 23

6-2-3. System Control Block Diagram .................................. 25

6-3. Printed Wiring Boards and Schematic Diagrams................ 27

6-3-1. Printed Wiring Board – Main Board – ........................ 27

6-3-2. Schematic Diagram – Main Board (1/4) ..................... 31

6-3-3. Schematic Diagram – Main Board (2/4) – .................. 33

6-3-4. Schematic Diagram – Main Board (3/4) – .................. 35

6-3-5. Schematic Diagram – Main Board (4/4) – .................. 37

6-3-6. Printed Wiring Board – System Board – ..................... 39

6-3-7. Schematic Diagram – System Board – ........................ 41

6-3-8. Printed Wiring Board – SW Board –........................... 43

6-3-9. Schematic Diagram – SW Board –..............................45

6-4. IC Block Diagrams ............................................................. 46

7. EXPLODED VIEWS..................................................... 49

7-1. Main Unit Section ............................................................... 49

7-2. Mechanism Deck Section ................................................... 50

8. ELECTRICAL PARTS LIST...................................... 51

5. ELECTRICAL ADJUSTMENTS..............................15

5-1. General ................................................................................ 15

5-2. Notes for Adjustment .......................................................... 15

5-2-1. Jigs ............................................................................... 15

5-2-2. Adjustment sequence ...................................................15

5-2-3. Power ........................................................................... 15

5-3. Reset NV ............................................................................. 15

5-3-1. How to Reset NV ........................................................ 15

5-4. Manual Power Adjustments ................................................ 15

5-4-1. Adjustment sequence ...................................................15

5-4-2. Vc PWM Duty (L) Adjustment Method...................... 15

5-4-3. Vrem PWM Duty (L) Adjustment Method.................. 15

5-4-4. Vc PWM Duty (H) Adjustment Method ..................... 16

5-4-5. Vrem PWM Duty (H) Adjustment Method................. 16

5-5. Overall Adjustment Mode ................................................... 16

5-5-1. Overall Adjustment Mode Structure............................ 16

5-5-2. Overall CD and MO adjustment Method .................... 16

5-5-3. Overall CD and MO adjustment Items ........................ 17

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SECTION 1

SERVICING NOTE

1) When repairing this device with the power on, if you remove the main board or open the upper panel assy, this device stops working. In this case, you can work without the device stopping by fastening the hook of the OPEN/CLOSE switch (SW board S809) with tape.

SW board S809

2) This set is designed to perform automatic adjustment for each adjustment and write its value to EEPROM. Therefore, when EEPROM (SYSTEM board IC802) has been replaced in service, be sure to perform automatic adjustment and write resultant values to the new EEPROM. Refer to section 5 Test Mode (page 11) for details.

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SECTION 2

GENERAL

This section is extracted from instruction manual.

– 5 –

– 6 –

SECTION 3

DISASSEMBLY

Note : This set can be disassemble according to the following sequence.

Set Lid Assy, Upper Holder Assy Mechanism Deck

Note : Follow the disassembly procedure in the numerical order given.

3-1. LID ASSY, UPPER

screw(1.7),MI

“Plate (L) Assy, Fulcrum ”, “ Plate (R) Assy, Fulcrum”

System Board

Service Assy, OP

lid assy, uppe

SW Board, Main Board

3-2. HOLDER ASSY

screw(1.7),MI

holder assy

shaft

– 7 –

shaf

3-3. MECHANISM DECK

screw, step

CN551

claw

mechanism dec

connector

3-4. SYSTEM BOARD

CN601

SYSTEM board

– 8 –

3-5. “PLATE (L) ASSY, FULCRUM”, “PLATE (R) ASSY, FULCRUM”

Note: When installing, fit the knob (OPEN).

screw(1.7),MI

plate (L) assy, fulcrum

screw(1.7),MI

M 1.4

plate (R) assy, fulcrum

M 1.4

knob (open)

3-6. SW BOARD, MAIN BOARD

Note: When installing, fit the knobs (HOLD, MB, AVLS).

case, battery

SW board

CN802

removal the solders.

lid , battery case

claw

– 9 –

MAIN board

3-7. SERVICE ASSY, OP

)

service assy, OP

M 1.4

washer

gear (SA

– 10 –

SECTION 4

TEST MODE

4-1. GENERAL

• When entered in the TEST MODE, this set provides the Overall Adjustment mode which allows CD and MO discs to be automatically adjusted. In the Overall Adjustment mode , the system discriminates between CD and MO discs, performs adjustments in sequence automatically, and displays the faulty location if any fault is found. In the Manual mode, selected adjustments can be performed automatically.

• The attached remote control is used to operate the TEST MODE. Unless otherwise specified in the text, the key means that on the remote control.

4-2. SETTING THE TEST MODE

4-2-1. How to set the TEST MODE

T o set the TEST MODE, two methods are available. 1 Solder bridge and short BP801 (TEST) on the system board.

Then turn on the power.

SYSTEM BOARD (SIDE A )

TP821

TP816

TP823

TP822

TP819

TP820

TP818

Remote control LCD

888

All on

All off

004 V1.100

Microprocessor version display

• Press and hold down X to hold the current display while the key is being pressed.

4-2-3. How to release the TEST MODE

When method 1 was used:

Turn off the power and open the solder bridge on BP801on the system board. Note: The solder should be removed clean. The remaining

solder may make a short with the chassis and other part.

When method 2 was used:

Turn off the power.

BP801

1-675-487-

BP801

2 In the normal mode, operate the keys on the set and those on the

remote control as specified below: Turn on HOLD switch on the set. Holding down x (STOP) key on the set, press the keys on the remote control in the following sequence:

> N t > N t . t . t > N t . t > N t . t X t X

4-2-2. Operations when the TEST MODE is set

When the TEST MODE is entered, the system switches to the display check mode within the TEST MODE. From this mode, the other Test modes can be accessed. When the TEST MODE is set, the LCD repeats a cycle of the following displays:

4-3. TEST MODE STRUCTURE

Test Mode (Display Check Mode)

key

Manual Mode

key

Overall Adjustment Mode

key

DISPLAY key

Self-diagnostic Display Mode

key

DISPLAY key

(Press and hold down about 3 sec.)

Terminate key checking or open the top panel.

Servo Mode

Audio Mode

Power Mode

OP Alignment Mode

Key Check Mode

– 11 –

4-4. MANUAL MODE 4-4-1. Outline of the function

The Manual mode is designed to perform adjustments and operational checks on the set’s operation according to each individual function. Usually, no adjustments are made in this mode. However, the Manual mode is used to clear the memory before performing automatic adjustments in the Overall Adjustment mode.

4-4-2. How to set the Manual mode

1. Set the TEST MODE and press + key to set the Manual mode. Remote control LCD display

888 Manual

2. Each test item is assigned with a three-digit item number. The third digit stands for a major item, the second digit for a middle item, and the first digit for a moniro item.

> N

Change Major Item

Change Middle Item

keykey

key : Up key : Down

Address Value & Adjustment Value

LCD display

011 C68S01

Jitter Value & Adjustment Value

LCD display

011 0FFJ01

Block Error Value & Adjustment Value

LCD display

011 063B01

ADIP Error Value & Adjustment Value

LCD display

011 059A01

Item Title Display

LCD display

011 LrefPw

Power Adjustment Value

LCD display

731 AD 85

> N

key

Change Minor Item

key

key : Up

> N

key : Down

Change Adjustment Value

Write Adjustment Value

key : Up key : Down

key : Write

3. During each test mode, the display is changed from one to another each time DISPLAY key is pressed.

Note: In the Power mode, the power adjustment value is only

displayed.

4. During each test, press and hold down > N key or . key for a while to move the optical pickup on the sled outer or inner perimeter.

5. To terminate the Manual mode and return to the TEST MODE, press x key.

4-5. OVERALL ADJUSTMENT MODE 4-5-1. Outline of the function

This mode is designed to adjust the servo system automatically by going through all the adjustment items. Usually, this mode is used to perform automatic adjustments when servicing the set.

For further information, refer to section 5. ELECTRICAL ADJUST MENTS (page 15).

4-6. SELF-DIAGNOSTIC DISPLAY MODE 4-6-1. Outline of the function

The Self-diagnostic system is used in this set. If an error occurs during playback, this system detects the fault through the microprocessor’s mechanism and power control blocks and stores the cause in EEPROM in a history format. This history, which can be viewed in the TEST MODE, provides the means of locating the fault in troubleshooting.

– 12 –

4-6-2. Self-diagnostic mode

1. Set the TEST MODE.

2. With all the LCD display segments blinking on the set, press DISPLAY key and the Self-diagnostic mode is entered.

History code Error display code

888

3. Hereinafter, each time > N key is pressed, the reference information display changes as follows:

888 1st0XX

888 1st100

1st022

888 N-10XX

888 N-1100

• Contents of the history codes History code number

1st 0 The first error that occurred. 1st 1 1st 2 N 0 The last error that occurred. N1 N2 N-1 0 The first error from the last one. N-1 1 N-1 2 N-2 0 The second error from the last one. N-2 1 N-2 2

REC

Displays 00.

Displays 00. Total recording time (0000 is displayed

for MZ-E90.)

Contents

888 1st200

888 N 0XX

888 N 100

888 N 200

888 N-1200

888 N-20XX

888 N-2100

888 N-2200

888 R 0000

(Turn back)

• Press . key to go back to the previous display.

• Description of the error display codes Contents of fault Display code Meaning of code Description

No error 00 No error

01 Access target address illegally specified An attempt to access an abnormal address.

Servo system error

AUDIO error 12

Power system error

02 HIGH TEMP HIGH TEMP 03 FOCUS ERROR Focus off-center. 04 SPINDLE ERROR Abnormal rotation of disc 11

13 21 INIT LOWBATT Abnormal voltage during initialization 22 LOWBATT Instantaneous interruption detected. 23 LOWBATT NI Instantaneous interruption detected (NiMH). 24 LOWBATT AM Instantaneous interruption detected (AM).

4-6-3. Clearing the error display code

After servicing, reset the error display code.

1. Set the TEST MODE. (See page 11)

2. To reset the error display code, press X key on the remote

control when the code is displayed. (All the data on the 1st, N, N-1 and N-2 will be reset.)

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