Sony MZ-B50 Service manual

MZ-B50

SERVICE MANUAL

Ver 1.1 2001.03 With SUPPLEMENT-1 (9-927-952-83)

US and foreign patents licensed from Dolby Laboratories Licensing Corporation

SPECIFICATIONS

US Model

Canadian Model

AEP Model

Tourist Model

Model Name Using Similar Mechanism NEW

Mechanism Type MT-MZB50-165

Optical Pick-up Name LCX-2R

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 lens surface on the optical pick-up block with 7 mm aperture.)

Recording and playback time

Maximum 80 minutes (MDW-80, stereo recording) Maximum 160 minutes (MDW-80, monaural recording) Maximum 74 minutes (MDW-74, stereo recording) Maximum 148 minutes (MDW-74, monaural recording)

Revolutions

400 rpm to 1,800 rpm (CLV)

Error correction

Advanced Cross Interleave Reed Solomon Code (ACIRC)

Sampling frequency

44.1 kHz

Sampling rate converter

Input: 32 kHz/44.1 kHz/48 kHz

Coding

Adaptive TRansform Acoustic Coding (ATRAC)

Modulation system

EFM (Eight to Fourteen Modulation)

Number of channels

2 stereo channels 1 monaural channel

Speaker

28 mm (1 1/8 in.) dia.

Frequency response

20 to 20,000 Hz ± 3 dB

Wow and Flutter

Below measurable limit

Inputs

Microphone: stereo mini-jack, 0.35– 1.38 mV Line in: stereo mini-jack, 69– 194 mV Optical (Digital) in: optical (digital) mini-jack

Outputs

i : stereo mini-jack Headphones/earphones: 5 mW + 5 mW Speaker: 300 mW

– Continued on next page –

9-927-952-12

2001C0200-1

PORTABLE MINIDISC RECORDER

Sony Corporation

Audio Entertainment Group

General Engineering Dept.

General

Power requirements

DC 3V Two LR6 (size AA) alkaline batteries

Battery operation time

Battery life1) (EIAJ2)) Batteries Recording Playback Two LR6 (size AA) Approx. Approx.

Sony alkaline dry batteries 6 hours 18 hours

The battery life may be shorter due to operating conditions, the temperature of the location, and varieties of batteries.

Measured in accordance with the EIAJ (Electronic Industries Association of Japan) standard.

When using LR6 (SG) Sony “STAMINA” alkaline dry batteries (produced in Japan).

To prevent interrupted recording due to drained batteries, use new batteries for recording operations.

When played using the built-in speaker.

Dimensions

Approx. 88.0 × 28.0 × 121.4 mm (w/h/d) (3 1/2 × 1 1/8 × 4 7/8 in.) not incl. projecting parts and controls.

Mass

Approx. 240 g (8.4 oz)

Supplied accessories

Headphones/earphones with a remote control (1) Sony LR6 (size AA) dry batteries (2) Carrying pouch (1) Hand strap (1)

Design and specifications are subject to change without notice.

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.

TABLE OF CONTENTS

1. SERVICING NOTES 3

2. GENERAL 4

3. DISASSEMBLY 3-1. Panel (Lower) ASSY 6 3-2. Main Board, Sled Control Board 6 3-3. Panel (Upper Lid) ASSY 7 3-4. Key Board Unit 7 3-5. BATT Board, DC Jack Board 8 3-6. Mechanism Deck8 3-7. Optical Pick-up 9

4. TEST MODE 10

5. ELECTRICAL ADJUSTMENTS17

6. DIAGRAMS 6-1. Explanation of IC Terminals 22 6-2. Block Diagram – Main Section (1/3) – 29 6-3. Block Diagram – Main Section (2/3) – 31 6-4. Block Diagram – Main Section (3/3) – 33 6-5. Printed Wiring Boards – Main Section (1/2) – 35 6-6. Printed Wiring Boards – Main Section (2/2) – 37 6-7. Printed Wiring Boards – Battery Section – 39 6-8. Schematic Diagram – Main Section (1/4) – 41 6-9. Schematic Diagram – Main Section (2/4) – 43 6-10. Schematic Diagram – Main Section (3/4) – 45 6-11. Schematic Diagram – Main Section (4/4) – 47

7. EXPLODED VIEWS 7-1. Panel (Lower) Section 55 7-2. Panel Upper Lid Section 56 7-3. Cabinet (Belt) Section 57 7-4. Mechanism Deck Setion (MT-MZB50-165) 58

8. ELECTRICAL PAR TS LIST 59

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.

CAUTION

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

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.

– 2 –

SECTION 1

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

Never look into the laser diode emission from right above when checking it for adjustment. It is feared that you will lose your sight.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK (LCX-2R)

The laser diode in the optical pick-up block may suffer electrostatic break-down easily. When handling it, perform soldering bridge to the laser-tap on the flexible board. Also perform measures against electrostatic break-down sufficiently before the operation. The flexible board is easily damaged and should be handled with care.

• 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 detect switch (S801).

S801

• This set is designed to perform automatic adjustment for each adjustment and write its value to EEPROM. Therefore, when EEPROM (IC802) has been replaced in service, be sure to perform automatic adjustment and write resultant values to the new EEPROM. (Refer to Section 5 Electrical Adjustment. (page 17))

• Replacement of CXD2660GA (IC502) and CXR701080-020GA (IC801) used in this set requires a special tool.

laser-ta

OPTICAL PICK-UP FLEXIBLE BOARD

– 3 –

LOCATION AND FUNCTION OF CONTROLS

– Front of the recorder –

SECTION 2

GENERAL

This section is extracted from instruction manual.

1 EASY SEARCH +/– buttons 2 VOR indicator 3 PLAY MODE button 4 DISPLAY button 5 .REVIEW/AMS/>CUE/AMS

(search /AMS) button

6 FAST PB button 7 x STOP button 8 i (headphones/earphones) jack 9 OPEN switch 0 N PLAY (play) button qa X P AUSE button qs HOLD switch qd Display window qf Microphones qg Speaker qh EDIT/ENTER button qj DC IN 3V jack qk TRACK MARK button ql ERASE button w; REC MODE switch wa VOR button ws VOL control wd REC indicator wf z REC button

– Back of the recorder –

1 Battery compartment 2 CLOCK SET button 3 SYNCHRO REC (synchro-recording)

switch

4 MIC (PLUG IN POWER) jack 5 LINE IN (OPTICAL) jack 6 MIC SENS switch 7 MEGA BASS button

– 4 –

– The display window –

1 2 3 4 5 6

7 8 9

0 qa qs qd qf qg qh qj

1 V-UP indication 2 Fast Playback indication 3 Disc indication

Shows that the disc is rotating for recording, playing or editing an MD.

4 STEREO (stereo)/MONO (monaural) indication 5 Play mode indication 6 REC indication

Lights up while recording. When flashing, the recorder is in record standby mode.

7 Pause indication 8 SYNC (synchro-recording) indication 9 VOR indication 0 Mega Bass indication qa Character information display

Displays the disc and track names, date, error messages, track numbers, etc.

qs Battery indication qd REMAIN (remaining time/tracks) indication

Lights up along with the remaining time of the track, the remaining time of the MD, or the remaining number of tracks.

qf REC DATE (recorded/current date) indication

Lights up along with the date and time he MD was recorded. When only “ DATE” lights up, the current date and time are displayed.

qg Time display qh Level meter

Shows the volume of the MD being played or recorded.

qj AM/PM indication

– The headphones/earphones with a remote control –

7 8

1 Stereo mini plug 2 V-UP button 3 TRACK MARK button 4 HOLD switch

Slide to lock the controls of the remote control.

5 X (pause) button 6 Headphones/earphones 7 x (stop) button 8 >N buttons 9 .REVIEW/AMS 0 VOL control

– 5 –

SECTION 3

DISASSEMBLY

The equipment can be removed using the following procedure.

Panel (lower) ASSY Main board, Sled control board

Panel (upper lid) ASSY Key board unit

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

3-1. PANEL (LOWER) ASSY

BATT board, DC jack board Mechanism deck

3 Claw

Optical pick-upSet

6 Claw

5 Screw

(B1.7x5)

Ornament (L)

7 Claws

3-2. MAIN BOARD, SLED CONTROL BOARD

Remove solder (4 places)

Motor flexible board

(CN602)

Switch unit

(CN802)

Ornament (R)

Panel (lower) Ass

1 Screws

(B1.7x6)

4 Claws

2 Screws

(B1.7x5)

Sled control board

OPEN

Screws (1.7x3)

Main board

– 6 –

Screws (1.7x3)

Screw (1.7x3)

Remove solder (3 places)

Remove solder (4 places)

Connector uni (CN801)

OP flexible board

3-3. PANEL (UPPER LID) ASSY

)

Claw

Panel (upper lid) ASSY

Screw (step M1.4)

Spring (UP), tension

3-4. KEY BOARD UNIT

6 Screws

(1.7x3)

Button (upper lid)

2 Screws

(B1.7x4)

1 Screw,

ornament

Claw

Panel (upper lid) sub ASSY

2 Screws

(B1.7x4

Cabinet (upper lid)

Key board unit

4 Screws

(1.7x3)

– 7 –

3-5. BATT BOARD, DC JACK BOARD

1 Screws (1.7x3)

Cabinet (belt)

3-6. MECHANISM DECK

Mechanism deck (MT-MZB50-165)

BATT board

4 Screws (1.7x3)

DC jack board

Head flexible board (CN2001)

2 Insert a precision screwdriver

and move a point of battery terminal (+) away from a claw.

Motor flexible board

Cover (flexible)

Screws (1.7x2.5)

Spacer (flexible cover)

– 8 –

OP flexible board

Cover (flexible)

Screws (1.7x2.5)

Spacer (flexible cover)

Screws (step)

3-7. OPTICAL PICK-UP

Opening the over write head toward the direction A, remove the OP Service assy toward the direction B. Note: Do not open the entire assy

forcibly, when opening the over write head.

Peel off the head flexible board

Over write head section

1 Washer (0.8 - 2.5)

3 Precision pan screw

(M1.4)

4 Rack spring

5 Screw

8 Bearing

Mechanism deck (MT-MZB50-165)

2 Gear (SA)

7 Pull off the lead screw.

5 Screw

Optical pick-up (LCX-2R)

– 9 –

SECTION 4

X801

TEST MODE

[Outline]

• This set provides the Overall adjustment mode (Assy mode) that allows CD and MO disc to be automatically adjusted when in the test mode. In this overall adjustment mode, the protect switch is detected to judge the disc, CD or MO, and each adjustment is automatically executed in order. If a fault is found, the system displays its location. Also, the manual mode allows each individual adjustment to be automatically adjusted.

• The keys in the description refer to the keys on both set and remote commander unless otherwise specified. Though LCD display shows the LCD of the remote commander, same contents are also displayed on the LCD of the set.

[Setting Method of Test Mode]

There are two different methods to set the test mode: 1 Short BP801 (TEST) on the MAIN board with a solder bridge

(connect pin y; of IC801 to the ground). Then, turn on the power.

BP801

SHORT: TEST MODE

OPEN: NORMAL MODE

MAIN BOARD (SIDE A)

GRN

R805

R803

R804

YEL

C810

R807

BP801 SHORT: TEST MODE OPEN: NORMAL MODE

R851

R850

R849

R848

IC804

2 In the normal mode, turn on the HOLD switch on the set. While

pressing the N key on the set, press the following set keys in the following order:

> t > t . t . t > t . t

> t . t X t X

[Operation in Setting the Test Mode]

• When the test mode becomes active, first the display check mode is selected. (Press x key once, when the display check mode is not active.)

• Other mode can be selected from the display check mode.

• When the test mode is set, the LCD repeats the following display.

LCD display

All lit

All off

Microprocessor version display

V0.000

000

R802

812

813

807

IC801

R838

X802

106

C808

• When the X key is pressed and hold down, the display at that time is held so that display can be checked.

[Releasing the Test Mode]

For test mode set with the method 1: Turn off the power and open the solder bridge on BP801 (TEST) on the MAIN board.

Note: Remove the solders completely. Remaining could be shorted with

the chassis, etc.

For test mode set with the method 2: Turn off the power.

Note: If electrical adjustment (see page 18) has not been finished com-

pletely, always start in the test mode. (The set cannot start in normal mode.)

– 10 –

[Configuration of Test Mode]

[Test Mode $Display Check Mode%]

Press the

> or

[EASY SEARCH +]

[Manual Mode]

Press the

x key

. or

[EASY SEARCH --]

[Overall Adjustment Mode]

Press the

x key

key

[Servo Mode]

[Audio Mode] [Power Mode]

[OP Alignment Mode]

key

[Major item switching]

key x key

[Medium item switching]

key

[EASY SEARCH +]

[EASY SEARCH --]

[EASY SEARCH +]

[EASY SEARCH --]

key:100th place of

mode number increase.

key:100th place of

mode number decrease.

key: 10th place of

mode number increase.

key: 10th place of

mode number decrease.

Press the N or

Press the

x key

[REC]

key on the set

[Sound Skip Check Result Display Mode]

Press the

[DISPLAY]

key

[Self-Diagnosis Display Mode]

Press the

on the remote commander for several seconds.

x key

[TRACK MARK]

key

[Key Check Mode]

Quit the key check or open the upper panel

[Manual Mode]

Mode to adjust or check the operation of the set by function. Normally, the adjustment in this mode is not executed.

• Transition method in Manual Mode

1. Setting the test mode. (See page 10)

2. Press the mode where the LCD display as shown below.

> or [EASY SEARCH +] key activates the manual

LCD display

Manual

000

[Minor item switching]

key: Unit place of mode number

increase.

[Adjusted value variation]

[EASY SEARCH +]

[EASY SEARCH --]

key: Increases the

key: Decreases the

[Adjusted value write]

key: When adjusted value is

changed: Adjusted value is written. When adjusted value is not changed: That item is adjusted automatically.

adjusted value

3. The optical pick-up moves outward or inward while the > or . key is pressed for several seconds respectively.

4. Each test item is assigned with a 3-digit mode number; 100th place is a major item, 10th place is a medium item, and unit place is a minor item.

– 11 –

5. Set the mode No. to 011. The display changes a shown below

each time the [DISPLAY] key is pressed.

• Address & Adjusted Value Display

LCD display

C68S01

011

address

• Jitter Value & Adjusted Value Display

LCD display

0FFJ01

jitter value

• Block Error Value & Adjusted Value Display

LCD display

adjusted value

mode number

011

adjusted value

mode number

063B01

011

block error value

• ADIP Error Value & Adjusted Value Display

LCD display

adjusted value

mode number

059A01

011

ADIP error value

• Item Title Display

LCD display

LrefPw 01

item title

adjusted value

mode number

011

adjusted value

mode number

[Overall Adjustment Mode]

Mode to adjust the servo automatically in all items. Normally, automatic adjustment is executed in this mode at the repair. Adjust the CD first, when performing adjustment.

• Configuration of overall adjustment

> key . key

Title

display

N key

protect switch ON

protect switch OFF

x key

CD overall

adjusting

All item

CD overall

adjustment

MO overall

adjusting

MO overall

adjustment

> key

NG item exists or

NG item exists

x key

CD overall

adjustment

x key

MO overall adjustment

[Test mode $display check mode%]

For further information, refer to the Section 5 Electrical Adjustment. (See page 17)

However in the power mode (mode number 700’s), only the power adjustment value is displayed.

• Power Supply Adjusted Value

LCD display

AD 85

731

fixed display mode numbe

adjusted value

6. Quit the manual mode, and press mode (display check mode).

x key to return to the test

– 12 –

[Sound Skip Check Result Display Mode]

This set can display and check the error count occurring during record and play.

• Setting method of Sound Skip Check Result Display Mode

1. Setting the test mode. (See page 10)

2. Press the N or [REC] key on the set activates the sound skip

check result display mode where the LCD displays as shown below.

LCD dispaly

P**R**

000

Total of record system error count

Total of play system error count

3. When N key is pressed, the total of error count is displayed

on the LCD, and each time the > key is pressed, the error count descents one by one as shown below. Also, when . key is pressed, the error count ascends by one. If

[REC] key on the set is pressed, the error count during record

is displayed.

P**R**

EIB **

Stat**

Adrs**

BEmp**

######

000

4. When [REC] key on the set is pressed, the total of error count is displayed on the LCD, and each time the > key is pressed, the error count descents one by one as shown below. Also, when . key is pressed, the error count ascends by one. If N key is pressed, the error count during play is displayed.

P**R**

Bovr**

BFul**

Rtry**

######

: Sound skip check items counter (hexadecimal)

######

: 6-digit address (hexadecimal) where a sound skipped last

000

Error code

Cause of error Description of error

EIB Sound error correction error

Playback

Recording BFul Buffer capacity lowers and data are

Stat Decorder status error Adrs Cannot access the address BEmp Buffer becomes empty BOvr Buffer becomes full and sounds are

dumped

forcibly written

Rtry Retry count over

5. Quit the sound skip check result display mode, and press the x key to return to the test mode (display check mode).

: Sound skip check items counter (hexadecimal)

######

: 6-digit address (hexadecimal) where a sound skipped

last

– 13 –

[Self-Diagnosis Display Mode]

• This set uses the self-diagnosis system in which if an error oc-

curs in recording/playback mode, the error is detected by the model control and power control blocks of the microprocessor and information on the cause is stored as history in EEPROM. By viewing this history in test mode, it helps you to analyze a fault and determine its location. Total recording time has been recorded as optical pick-up using time, and it is compared with the total recording time in the self-diagnosis display mode to find when an error occurred. Clear both total recording time and the time in self-diagnosis display mode, when the optical pick-up was replaced.

1. Setting the test mode. (See page 10)

2. Press the [DISPLAY] key activates the self-diagnosis display mode where the LCD display as shown below.

LCD dispaly

1st0**

000

history code

** : Self-Diagnosis Data

3. Then, each time > key is pressed, LCD display descends by one as shown below. Also, the LCD display ascends by one when . key is pressed.

000

1st0**

000

1st1**

000

1st2**

000

N 0**

000

N 1**

000

N 2**

000

N-10**

000

N-11**

000

N-12**

000

N-20**

000

N-21**

000

N-22**

000

R ####

4. Quit the self-diagnosis display mode, and press the return to the test mode (display check mode).

x key to

– 14 –

• Description of Indication History

History code number Description

1st0 The first error 1st1 Total recording time when 1st0 was generated (Higher rank byte) 1st2 Total recording time when 1st0 was generated (Lower rank byte) N 0 The last error N 1 Total recording time when N 0 was generated (Higher rank byte) N 2 Total recording time when N 0 was generated (Lower rank byte) N-10 One error before the last. N-11 Total recording time when N-10 was generated (Higher rank byte) N-12 Total recording time when N-10 was generated (Lower rank byte) N-20 Two errors before the last. N-21 Total recording time when N-20 was generated (Higher rank byte) N-22 Total recording time when N-20 was generated (Lower rank byte) REC Total recording time *

• Description of Error Indication Codes

Problem Indication code Meaning of code Description

No error 00 No error

Servo error 02 High temperture High temperture

03 Focus error Forcus could not be applied 04 Spindle error Abnormal lotation of disc 21 Initial low battery Abnormal voltage at initialization

Power error

22 Low battery Momentary interruption detected 23 Low battery NI Momentary interruption detected (NiMH) 24 Low battery AM Momentary interruption detected (AM)

Illegal access target address Attempt to access an abnormal address was specified

* Total recording time Total recording time is recorded in minutes. It is recorded in hexadecimal format and up to 65,535 min. can be counted. It returns to “0000min” when recorder goes beyond this limit.

[Clearing Self-Diagnosis Data and Total Recording Time]

1. Setting the test mode. (See page 10.)

2. Move up the jog key on the set or press the [DISPLAY] key on the remote commander activates the self-diagnosis display mode.

3. Press the X key or [REC] key on the set during display of self-diagnosis data when clearing the self-diagnosis data, or during display of total recording time when clearing the total recording time. Thus, “ClrOK?” will be displayed on the LCD, and press the same key again, and when self-diagnosis data is cleared “ErrCLR” is displayed and the data is cleared. Also when total recording time is cleared, “ ReeT O” is displayed and it is cleared.

– 15 –

[Key Check Mode]

This set can check if the set and remote commander function normally.

• Setting Method of Key Check Mode

1. Setting the test mode. (See page 10)

2. Press the [T MARK] activates the key check mode where all segments of LCD turn OFF. (At the last two digits of DOT section, AD value of remote commander key line is displayed in hexadecimal)

3. When each key is pressed, it is displayed on the LCD, implying that it was successfully checked as shown below. However, for the slide switch on the set, it is not checked unless it is reciprocated.

* The key pressed to enter the key check mode was already

checked at that time.

Set key

Key Indication

N PLAY > FF . FR

X PAUSE

EASY SEARCH + EASY + EASY SEARCH – EASY –

x STOP

REC REC

TRACK MARK T MARK

HOLD (hold) HLDon

HOLD (off) HLDoff SYNCHRO REC (on) SYCon SYNCHRO REC (off) SYCoff

PLAY MODE P MODE

DISPLAY DISP

EDIT/ENTER ENTER

FAST PB FAST P

MEGA BASS M BASS

VOR VOR

ERASE ERASE

REC MODE (STEREO) RMODEs

REC MODE (MONO) RMODEm

Remote commander key

Key Indication

N/> rPLAY

. rFR

X rPAUSE x rSTOP

4. The test mode (display check mode) is automatically activated when all keys on the set and remote commander were checked (see above). Also, the test mode (display check mode) gets back if opening the upper panel during a key check.

– 16 –

SECTION 5

ELECTRICAL ADJUSTMENTS

[Outline]

• In this set, automatic adjustment of CD and MO can be performed by entering the test mode. (See page 10) However, before starting automatic adjustment, the memory clear, power adjustment and temperature adjustment must be performed in the manual mode.

[Precautions for Adjustment]

1. Adjustment must be done in the test mode only.

After adjusting, release the test mode.

2. Use the following tools and measuring instruments.

• Test CD disc TDYS-1 (Part No. : 4-963-646-01)

Available SONY CD disc

• Recorded MO disc PTDM-1 (Part No. : J-2501-054-A)

Available SONY MO disc (recorded)

• Laser power meter LPM-8001 (Part No. : J-2501-046-A)

• Digital voltmeter

3. Unless specified otherwise, supply DC 3V from the DC IN 3V jack.

4. Switch position

HOLD switch ................ OFF

[Adjustment Sequence]

Adjustment must be done with the following steps.

1. NV Reset (Memory clear)

2. Power Supply Manual Adjustment Manual Mode

3. Temperature correction

4. CD Overall Adjustment

r Overall Mode

5. MO Overall Adjustment

      

    

[NV Reset]

• Setting method of NV reset

1. Select the manual mode of test mode, and set mode number 021NV Reset.

LCD display

ResNV

021

2. Press the X key.

LCD display

ResOK?

021

3. Press the X key once more.

LCD display

Res***

021

r NV reset (after several seconds)

Reset!

021

4. Quit the manual mode, and activate the test mode.

[Power Supply Manual Adjustment]

• Adjustment sequence

Adjustment must be done with the following steps.

1. VC PWM Duty (L) adjustment (mode number: 762)

2. VREM PWM Duty (H) adjustment (mode number: 763)

3. VREM PWM Duty (L) adjsutment (mode number: 764)

4. VC PWM Duty (H) adjustment (mode number: 765)

5. VREM PWM Duty (H) adjustment (mode number: 766)

6. VREM PWM Duty (L) adjustment (mode number: 767)

– 17 –

• Adjustment method of VC PWM Duty (L)

R937

R924

R936

R923

C610

R937

R924

R936

R923

C610

(mode number: 762)

1. Select the manual mode of the test mode, and set the mode number 762. (See page 11)

LCD display

VclPWM

762

TP914 (VR)

MAIN BOARD (SIDE B)

digital

voltmeter

TP5105

(GND)

2. Connect a digital voltmeter to the TP915 (VC) on the MAIN board, and adjust

[EASY SEARCH +] key (voltage up) or

[EASY SEARCH --] key (voltage down) so that the voltage

becomes 2.5 ± 0.02 V. Proceed to the next step without pressing X key if voltage is already adjusted.

digital

voltmeter

TP915 (VC)

TP5105

MAIN BOARD (SIDE B)

TP915

(VC)

R518

C526

R517

R520

C514

R505 C517

C516 C511

(GND)

C501

R507 C502

C503

504

610

TP5105

(GND)

R609

C611

R608

3. Press the X key to write the adjusted value.

• Adjustment method of VREM PWM Duty (H)

(mode number: 763)

1. Select the manual mode of the test mode, and set the mode number 763. (See page 11)

LCD display

VrhVcl

763

TP915

(VC)

TP914

(VR)

R505 C517

C516

R535

R537

R536

C514

R518

C526

R517

R520

C511 C508

3. Press the X key to write the adjusted value.

• Adjustment method of VREM PWM Duty (L) (mode number: 764)

1. Select the manual mode of the test mode, and set the mode

number 764. (See page 11)

LCD display

VrlVcl

764

2. Connect a digital voltmeter to the TP914 (VR) on the MAIN

board, and adjust

[EASY SEARCH --] key (voltage down) so that the voltage

becomes 2.5 ± 0.02 V. Proceed to the next step without pressing X key if voltage is already adjusted.

TP914 (VR)

MAIN BOARD (SIDE B)

[EASY SEARCH +] key (voltage up) or

TP5105

(GND)

C501

R507 C502

C503

TP5105

(GND)

C504

digital

voltmeter

2. Connect a digital voltmeter to the TP914 (VR) on the MAIN board, and adjust

[EASY SEARCH +] key (voltage up) or

[EASY SEARCH --] key (voltage down) so that the voltage

becomes 2.75 ± 0.02 V. Proceed to the next step without pressing X key if voltage is already adjusted.

TP915

(VC)

TP914

(VR)

C501

R507

R505

C502

C517

R535

R537

R536

C514

R518

C526

R517

R520

C516 C511 C508

C503

C504

TP5105

(GND)

3. Press the X key to write the adjusted value.

– 18 –

R937

R924

R936

R923

C610

• Adjustment method of VC PWM Duty (H)

R937

R924

R936

R923

C610

(mode number: 765)

1. Select the manual mode of the test mode, and set the mode number 765. (See page 11)

LCD display

VchPWM

765

TP914 (VR)

MAIN BOARD (SIDE B)

digital

voltmeter

TP5105

(GND)

2. Connect a digital voltmeter to the TP915 (VC) on the MAIN board, and adjust

[EASY SEARCH +] key (voltage up) or

[EASY SEARCH --] key (voltage down) so that the voltage

becomes 2.75 ± 0.02 V. Proceed to the next step without pressing X key if voltage is already adjusted.

TP915 (VC)

MAIN BOARD (SIDE B)

TP915

(VC)

R518

C526

R517

R520

C514

R505

C517 C516 C511

TP5105

(GND)

C501

R507 C502

C503

504

TP5105

(GND)

voltmeter

610

digital

C611

R609

R608

3. Press the X key to write the adjusted value.

• Adjustment method of VREM PWM Duty (H)

(mode number: 766)

1. Select the manual mode of the test mode, and set the mode number 766. (See page 11)

LCD display

VrhVch

766

2. Connect a digital voltmeter to the TP914 (VR) on the MAIN board, and adjust [EASY SEARCH +] key (voltage up) or

[EASY SEARCH --] key (voltage down) so that the voltage

becomes 2.75 ± 0.02 V. Proceed to the next step without pressing X key if voltage is already adjusted.

TP915

(VC)

TP914

(VR)

C501

R507

R505

C502

C517 C516

R535

R537

R536

C514

R518

C526

R517

R520

C511 C508

C503

C504

TP5105

(GND)

3. Press the X key to write the adjusted value.

• Adjustment method of VREM PWM Duty (L) (mode number: 767)

1. Select the manual mode of the test mode, and set the mode

number 767. (See page 11)

LCD display

VrlVch

767

2. Connect a digital voltmeter to the TP914 (VR) on the MAIN

board, and adjust

[EASY SEARCH --] key (voltage down) so that the voltage

becomes 2.5 ± 0.02 V. Proceed to the next step without pressing X key if voltage is already adjusted.

3. Press the X key to write the adjusted value.

TP914 (VR)

MAIN BOARD (SIDE B)

TP914

(VR)

[EASY SEARCH +] key (voltage up) or

digital

voltmeter

TP5105

(GND)

TP915

(VC)

C501

R507

R505

C502

R535

R537

R536

C514

R518

C526

R517

R520

C517

C516 C511 C508

C503

C504

TP5105

(GND)

– 19 –

[Temperature Correction]

)

• Adjustment Method of temperature correction

1. Select the manual mode of test mode, and set the mode number 014. (See page 11)

LCD display

SetTmp

014

2. Measure the ambient temperature.

3. Adjust with [EASY SEARCH +], [EASY SEARCH --] key so that the adjusted value (hexadecimal value) becomes the ambient temperature. (Initial value: 14h = 20 °C, Adjusting range: 80h to 7fh (–128 °C to +127 °C)

4. Press the X key to write the adjusted value.

[Overall Adjustment Mode]

• Adjustment Method of Overall Adjustment Mode

1. Setting the test mode. (See page 10)

2. Press the . or [EASY SEARCH --] key activates the over- all adjustment mode where the LCD display as shown below.

LCD display

ASSY**

000

: (DISC MARK) When power adjustment “H” finished;

Power supply is not yet adjusted unless both outward and inward disc marks are ON. Note: Disc mark is displayed on the remote commander

F 1* : Manual adjustment remains 0

LCD only.

: Left side = MO auto adjustment information

: Auto adjustment finished

: Not adjusted yet

Right side = CD auto adjustment information

F: CD auto adjustment finished

1: Manual adjustment remains (not auto adjustment

0: Not adjusted yet

Outward ON When power adjustment “L” finished; Inward ON

3. Insert the CD test disc TDYS-1 (Parts No.4-963-646-01) or an available SONY CD disc.

4. Press

N key. The system discriminates between CD and MO

and performs automatic adjustment for CD. Also, if . key is pressed, CD is adjusted automatically.

LCD display

CD RUN

%%%

: Manual mode number being executed

• CD Automatic Adjustment item

Mode No. Description

312 313 CD electrical offset adjustment 314 328 CD TWPP gain adjustment 321 CD tracking error gain adjustment 323 332 336 CD ABCD level adjustment 344 CD focus gain adjustment 345 CD tracking gain adjustment 521 522 341 CD focus bias adjustment

CD tracking error offset adjustment

CD two-axis sensibility adjustment

5. If the result of automatic adjustment is OK, the following display appears in the LCD:

LCD display

CD OK

341

6. If the result of automatic adjustment is NG, the following display appears in the LCD:

LCD display

### NG

###

: Overall adjustment. NG mode number

7. If NG, set the manual mode. Perform automatic adjustment for the items not accepted. (See page 11)

8. If CD adjustment is OK, insert an available SONY MO disc (recorded). At this time, be sure to turn OFF the disc protect switch.

9. Press N key. The system discriminates between CD and MO and performs automatic adjustment for the MO disc. Also, if > key is pressed, MO is adjusted automatically. However, when CD adjustment is not finished, “SetCD!” is blinking on the LCD and MO adjustment is not executed.

LCD display

MO RUN

%%%

: Manual mode number being executed

– 20 –

R502

C522

C507

C515

C509

C508

C511

C516

C517

C502

C506

R1010

R1001

R1003

R1002 R1004 R1006

C1003 C1002

C1004

C513

C503

C504

C531

C505

R1005

Q1001

TP5105

(GND)

• MO Automatic Adjustment item

Mode No. Description

112 113 114 118 221 Lower reflection CD tracking error gain adjustment 223 232 236 Lower reflection CD ABCD level adjustment 244 Lower reflection CD focus gain adjustment 245 Lower reflection CD tracking gain adjustment 121 MO tracking error gain adjustment 122 MO tracking error offset adjustment 134 MO TWPP gain adjustment 131 132 136 MO ABCD level adjustment 144 MO focus gain adjustment 145 MO tracking gain adjustment 434 MO write TWPP gain adjustment 431 432 436 MO write ABCD level adjustment 445 MO write tracking gain adjustment 411 412 448 32 cluster full recording 141 MO focus bias adjustment

MO electrical offset adjustment

Lower reflection CD tracking error offset adjustment

MO double speed read TWPP offset adjustment

MO write TWPP offset adjustment

MO normal speed read TWPP offset adjustment

10. If the result of automatic adjustment is OK, the following display appears in the LCD:

LCD display

MO OK

141

11. If the result of automatic adjustment is NG, the following display appears in the LCD:

LCD display

### NG

###

: Overall adjustment. NG mode number

12. If NG, set the manual mode. Perform automatic adjustment for the items not accepted. (See page 11)

13. To clear the data in overall adjustment mode, set the manual mode and change the mode number 021 (Res NV) to reset the NV. (See page 11)

14. When both CD and MO overall adjustments are OK, set the mode No. 043 (Resume) and clear the clock data.

LCD display

Note: In step 10, set the clock data to 99Y11M11D11H11M00S,

Resume

043

r Press the X key, historical data clear

ResClr

043

and in step 14, do not set the clock.

[Laser Power Check]

Connection :

Optical pick-up objective lens

R1005

Check Method :

1. Select the manual mode of test mode, and set the laser power adjusting mode. (mode number 010)

2. Press the

. key continuously until the optical pick-up

moves to the most inward track.

3. Open the cover and set the laser power meter on the objective lens of the optical pick-up.

4. Press the N key, and set the laser MO read adjustment mode. (mode number 011)

5. Check that the laser power meter reading is 0.81 ± 0.08 mW.

6. Check that the voltage both ends of resitor R1005 at this time is below 44 mV.

7. Press the N key, and set the laser CD read adjustment

mode. (mode number 012)

8. Check that the laser power meter reading is 0.97 ± 0.10 mW.

9. Check that the voltage both ends of resitor R1005 at this time is below 44 mV.

10. Press the N key, and set the laser MO write adjustment mode. (mode number 013)

11. Check that the laser power meter reading is 4.95 ± 0.50 mW.

12. Check that the voltage both ends of resister R1005 at this time is below 80 mV.

13. Press the x key.

14. Release the test mode.

– 21 –

laser

power mete

digital voltmeter

R1005

SECTION 6

DIAGRAMS

6-1. EXPLANATION OF IC TERMINALS

• MAIN BOARD IC501 SN761056CDBT (RF AMP, FOCUS/TRACKING ERROR AMP) Pin No. Pin name I/O Description

1 TE O Tracking error signal output to the CXD2660GA (IC502) 2 REXT — Connected to the external resistor for the ADIP amplifier control 3 WPPLPF — Connected to the external capacitor for low-pass filter of the TPP/WPP 4 VREF11 O Reference voltage output terminal (+1.1V) 5 C I Signal input from the optical pick-up detector (C) 6 D I Signal input from the optical pick-up detector (D) 7 D-C I Signal input from the optical pick-up detector (D) (AC input) 8 IY I I-V converted RF signal IY input from the optical pick-up block detector

9 IX I I-V converted RF signal IX input from the optical pick-up block detector 10 JX I I-V converted RF signal JX input from the optical pick-up block detector 11 JY I I-V converted RF signal JY input from the optical pick-up block detector 12 A I Signal input from the optical pick-up detector (A) 13 A-C I Signal input from the optical pick-up detector (A) (AC input) 14 B I Signal input from the optical pick-up detector (B) 15 TON-C — Connected to the external capacitor for the TON hold 16 CIG — Connected to the external capacitor for low-pass filter of the NPP divider denominator 17 CDN — Connected to the external capacitor for low-pass filter of the CSL divider denominator 18 PD-NI I Light amount monitor input terminal (non-invert input) 19 PD-I I Light amount monitor input terminal (invert input) 20 PD-O O Light amount monitor output terminal 21 ADFG O ADIP duplex FM signal (22.05 kHz ± 1 kHz) output to the CXD2660GA (IC502) 22 DVDD — Power supply terminal (+2.4V) (digital system) 23 SBUS I/O Two-way SSB serial data bus with the system controller (IC801) 24 SCK I SSB serial clock signal input from the system controller (IC801) 25 XRST I Reset signal input from the system controller (IC801) “L”: reset 26 OFTRK I Off track signal input from the CXD2660GA (IC502) 27 DGND — Ground terminal (digital system) 28 BOTM O Light amount signal (RF/ABCD) bottom hold output to the CXD2660GA (IC502) 29 PEAK O Light amount signal (RF/ABCD) peak hold output to the CXD2660GA (IC502) 30 VREF075 — Connected to the external capacitor for the internal reference voltage 31 VC O Middle point voltage (+1.2V) generation output terminal 32 CCSL2 — Connected to the external capacitor for low-pass filter of the TPP/WPP 33 RF OUT O Playback EFM RF signal output to the CXD2660GA (IC502) 34 AGND — Ground terminal (analog system) 35 EQ — Connected to the external capacitor for the RF equalizer 36 LP — Connected to the external capacitor for the RF equalizer 37 PS — Connected to the external capacitor for the RF equalizer 38 OFC-2 — Connected to the external capacitor for the RF AC coupling 39 OFC-1 — Connected to the external capacitor for the RF AC coupling 40 AVCC — Power supply terminal (+2.4V) (analog system) 41 ABCD O Light amount signal (ABCD) output to the CXD2660GA (IC502) 42 FE O Focus error signal output to the CXD2660GA (IC502) 43 S-MON O Servo signal monitor output to the system controller (IC801) 44 ADIP-IN I ADIP duplex FM signal (22.05 kHz ± 1 kHz) input terminal Not used

–––––––––––

– 22 –

+ 50 hidden pages