Sony MDH-10 Manuale utente

SECTION 1

INTRODUCTION

1-1 CONFIGURATION OF SERVICE MANUAL

This manual is maintenance guide for model MDH-10 series.

Section 2 describes disc (disk) and tools necessary for maintenance.

Section 3 provides fault diagnostic procedure that may require spare parts, measurement, or

adjustment. The overall check (ATP) after part replacement and adjustment will be included in

this section.

Section 4 describes how to disassemble / install every part of the unit.

Section 5 describes how to adjust / check the unit after faulty parts replacement, which are

found in Section 3.

Section 6 consists of circuit diagrams, assembly drawing, and parts list.

Section 7 describes pin assignment and block diagram of semiconductor.

1-2 CAUTION

Caution:

As the laser beam used in the unit is harmful to the eyes, do not attempt to

disassemble the enclosure. Refer to servicing to qualified personnel only.

This unit is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located

on the bottom.

The Danger label is located on the Mechanical Deck Cover Ass'y.

1-3 SWITCHES

1-3-1 SCSI ID Select

Assign the drive unit's ID number by setting these switches on ON or OFF. Do not assign the

same number as one previously assigned to another SCSI device.

ID No.

Mark

OFF

1-3-2 Terminator

When the terminator is enabled, the MD DATA drive must be at the last unit in the SCSI chain.

1-3-3 POWER Mode Select

When Reading/Recording data, set this switch to DATA. Also when playback any audio disc, set

this switch to AUDIO. POWER Lamp goes on for both settings.

1-3-4 AVLS

When setting this switch to ON. This function allows you to limit the maximum volume without

degrading the sound quality.

SECTION 2

TOOLS AND MEASURING INSTRUMENTS

2-1 GENERAL AND SPECIAL TOOLS

The tools and measuring equipments for performing maintenance on the MDH-10 series are

followings.

2-1-1 General Tools

SONY Parts No.

+ Screw

Driver (DK

20) (for 1.4mm)

721

050

09)

+ Driver 2.6mm

700

749

03)

Tweezers

700

753

02)

Round Nose Plier

700

757

01)

Cutter

700

758

02)

Driver (for Volume adjustment)

721

052

07)

+ Bit (#1) (for Torque Driver)(M0.8

2.0)

721

052

91)

+ Bit (#0) (for Torque Driver)(M1.6, 2.0)

721

052

92)

Soldering Iron (20W)

Base Tip for Soldering iron (for FFC removal)

702

088

01)

Desoldering Metal Braid (Solder Wick)

Power Supply DC+5V (min 2.0A)

Power Supply

5 ~

12V (min 1.0A) (only when RF Buffer Board)

BNC Cable (1.5m)

Thermometer (Digital)

Headphone (MDR

E741MP/K2) (for J1)

953

537

94)

Headphone (MDR

014MP) (for UC2, CEJ, CEK)

953

009

90)

Lip

12 Rechargeable Battery (

Lithium

ion battery pack)

SCSI Cable MOA

CIOT (for J1) (Bellows Type/50P

Full

50P

Half)

AC Adapter (for J1)

473

017

11)

AC Adapter (for UC2)

473

018

11)

AC Adapter (for AE4, CEJ)

473

019

11)

2-1-2 Special Tools

Quarter L (PCX-320 Series) system

Followings can be a substitute for the Quarter L system

PS/2 model 30

Dell Optiplex 4100

Note: Fujitsu SCSI card of PCMCIA Ver 2.0 could not be

supported.

Note: Following specification are required.

640kbytes or more RAM

w/3.5" Floppy Disk Drive

w/Hard Disk Drive

DOS ver 5.1 or later

SCSI Cable (E) (for UC2, CEJ, CEK pin type/50p Full

50p

Half)

905

910

0A)

Mech Deck Base

905

914

0A)

Over Write Head Height Tool

905

913

0A)

Power Cable (for RF Buffer Board)

609

130

0A)

BNC (one

end) Cable

907

202

0A)

Fixture Base (MDH

10)

905

911

0A)

Pin Board Ass'y

905

912

0A)

232 Cable

905

016

0A)

232 I/F Cable

905

901

0A)

232 Interface 3V

905

915

0A)

232 Cable (Host side)

905

904

0A)

Error Rate Counter

905

902

0A)

RF Buffer Board

905

917

0A)

MD DATA Power Checker (w/MD Cartridge)

905

0A)

AC Adapter (recommend A08017 (AC 90V to 110V (Advantest)) or A08019 (AC 200V to 245V

(Advantest))) (for MD DATA Power Checker)

Note: This checker consists of a Power Meter and a MD Cartridge. And only MD Cartridge can

be supplied for spare, as part No. J-905-906-0A.

Line Out Cable

905

919

0A)

2-1-3 Test Discs (Disks)

Acceptance Test Procedure (ATP)

System disk (OR

D707WA)

980

300

07)

This disk used for ATP. (for details, refer to

section 3

)

Function Check Disk (OR

D706WA)

980

300

06)

This disk used for unit

adjustment. (for details, refer to

section 5

)

Down Load Program Disk (OR

D702WA)

980

300

02)

This disk used for down load program. (for details, refer to

section 5

)

Note: Abovementioned disks can be worked on DOS V5.1 or later.

Writable Adjustment Disc No. 1

980

300

08)

Test Disc (Read Only) (TGYS

9001) (OR

D716WA)

980

300

24)

Audio Test Disc (TGYS

)

These discs (MD DATA) are used for unit adjustment and ATP.

2-1-4 Measuring Equipments

Oscilloscope (mini. 20MHz) (recommend Analog Type)

Frequency Response Analyzer (recommend 5010A (NF Electric

Instruments))

Jitter Meter (

recommend DB

3260 (KENWOOD))

EF Phase difference Meter (recommend Phase Detector for MD

(COPERU Co.))

SCSI Board (The SCSI Master (ADAPTEC AHA1542/1522/1742))

Pulse Jitter Counter (recommend TR5834/TR5835 (ADVANTEST))

Digital Multi

Meter

2-1-5 Expendable and Chemical Supplies

Cleaning Liquid Lens

250

100

0A)

Cotton Swab (200pcs)

740

900

65)

Diamond Oil (NT

68)

661

018

18)

Sankol (FG

84M)

662

001

36)

MD DATA is trademark of Sony Corporation.

ADAPTEC is a registered trademark of Adaptec, Inc. of the U.S.A. Other names of the

companies and products appearing in this manual are trademarks or registered trademarks of

those companies.

2-2 SPECIAL TOOLS

2-2-1 Pin Board Ass'y and Fixture Base

(1) Configuration (Refer to Fig. 2-2-1)

REF.

Description

REF.

Description

AP1013

AP7010

MT0

AP1015

AP7011

WFCK

AP1022

AP7013

DTSY

AP105

RFGND

AP8114

3.5V1

AP126

LDI0

AP8116

3.1V

AP127

LDI1

AP8118

TXD

AP5020

AP8119

RXD

AP5030

ABCD

AP8120

RST

AP5050

FBIAS

SP110

TAO

AP5060

SP5040

APCREF

AP5070

SP5090

FEO

AP5124

SERVOGND

TP722

ATER

AP5126

TP8332

UNREG1

AP5127

TP8333

2.85V

AP5128

FDI

TP8338

OP/CL

AP5129

TDI

TP8339

UNREG2

AP7007

MT3

TP8340

3.5V2

AP7008

MT2

TP8341

4.75V

AP7009

MT1

TP8342

GND

(2) Pin Board Ass'y Function

Switches

FBIAS ... This switch is used for Focus Error offset (FE) adjustment. (Set this switch to "Short"

during FE adjustment, and set to "Open" during FBIAS Adjustment.)

Test terminals

When using following Test terminals listed below on the Pin board, you can easily conduct any

adjustment or measurement.

(3) Installation to Fixture Base (MDH-10)

a. Remove the installation screws (4pcs) from the Fixture Base.

b. Carefully attach the Pin Board Ass'y to the Fixture Base.

c. Loosely fasten installation screws (4pcs) for adjustment later.

d. Put a drive to the base and slide it in place.

e. Push Pin Board up so that the positioning openings of drive's Mounted Board and

positioning pins are aligned straightly.

f. Fasten installation screws (4pcs) completely and then remove the drive from the

Fixture.

2-2-2 Error Rate Counter (MD)

This enable you to count C1, C2 errors which appear when reading data and also to monitor AT

errors of address (ADIP signals) which have already been recorded in Re-writable Adj. Disc or

Read Only Disc.

(1)

Configuration (Refer to Fig. 2-2-2)

Main Board

MTN Cable

Power Cable

(2) Error Rate Counter (MD) Function

Switches

SW1 ... This switch is to supply DC5V voltage to this board.

SW2 ... When it is set to 10sec side, this will show the count number of C1, C2 and AT errors

appeared in 73500 frames (ten times as large as 7350) every 10 seconds. They are 10 times as

large as the usual ones (no. of C1, C2, AT errors in 7350 frames). Divide the total numbers by

10, and you can get the average numbers.

Indicators

C1/C2 Error (LED1 to 8) ... These indicate numbers of two types of data errors; Random error

and Burst error. The random error is an error of 1-2byte long which appears all over the disc

and the Burst error is a long error which locally appears in the disc.

To correct MD Data errors, CIRC (CD's error correction system) is used. The CIRC uses two

layered correction codes, C1 and C2. C1 for correcting Random Errors and C2 for correcting

Burst Errors.

The C1 count of this error rate counter indicates number of frames where any C1 corrections

were made. The C2 count indicates number of frames where an error(s) could not be corrected

even after C1 and C2 corrections were applied. Usually maximum 220 count of C1 error is

allowed, but C2 error must be 0 to retrieve correct data. In case of reading Rewritable Adj.

Disc, C2 error normally occurred at linking points between clusters, because recorded data is

discontinued. A continuously recorded cluster area is necessary to measure true C2 error rate.

Follow instructions in each section for the correct procedure.

ATER (LED9 and 10)... The Rewritable Adj. Disc has address (ADIP signals) which show the

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