Sony PHC-ZW770L Service Manual

PHC-ZW770L

SERVICE MANUAL

Ver 1.0 1999. 03

CD

Section

TC

Section

AEP Model

UK Model

E Model

Model Name Using Similar Mechanism PMC-D305L
CD Mechanism Type KSM-213CDM
Optical Pick-up Name KSS-213C
Model Name Using Similar Mechanism NEW
T ape Transport Mechanism T ype MF-ZW750-117

CD player section

System

Compact disc digital audio system

Laser diode properties

Material: GaAlAs
Wave length: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 µW
(This output is the value measured at a distance of
about 200 mm from the objective lens surface on
the optical pick-up block with 7 mm aperture.)

Spindle speed

200 r/min (rpm) to 500 r/min (rpm) (CLV)

Number of channels

2

Frequency response

20 - 20,000 Hz +1/–2 dB

Wow and flutter

Below measurable limit

Radio section

Frequency range

FM: EE and CET model

65 - 74 MHz

87.5 - 108 MHz
Except EE and CET model

87.5 - 108 MHz
MW: 531 - 1,602 kHz
LW: 153 - 279 kHz

IF

FM: 10.7 MHz
MW/LW: 450 kHz

Aerials:

FM: Telescopic antenna
MW/LW: Built-in ferrite bar antenna

SPECIFICATIONS

Cassette-corder section

Recording system

4-track 2 channel stereo

Fast winding time

Approx. 120 s (sec.) with Sony cassette C-60

Frequency response

TYPE I (normal): 80 - 12,500 Hz

General

Speaker

Full range: 10 cm (4 in.) dia.,
6 ohms, cone type (2)

Outputs

Headphones jack (stereo minijack)
For 16 - 68 ohms impedance headphones

Maximum power output

4.5 W + 4.5 W

Power requirements

For personal audio system:
230 V AC, 50 Hz
9 V DC, 6 R20 (size D) batteries
For memory back-up:

4.5 V DC, 3 R6 (size AA) batteries
For remote controller:
3 V DC, 2 R6 (size AA) batteries

Power consumption

AC 28 W

– Continued on next page –

PERSONAL AUDIO SYSTEM

MICROFILM

– 1 –

Battery life

For personal audio system:

FM recording

Sony R20P: approx. 3.5 h
Sony alkaline LR20: approx. 10 h

Tape playback

Sony R20P: approx. 1.5 h
Sony alkaline LR20: approx. 5 h

CD playback

Sony R20P: approx. 1.5 h
Sony alkaline LR20: approx. 4 h
For memory back-up: approx. 1 year

Dimensions

Approx. 630 × 268 × 256 mm (w/h/d)

7/8 × 10 5/8 × 10 1/8 inches) (incl. projecting parts)

(24

Mass

Approx. 7.9 kg (17 lb. 7 oz.) (incl. batteries)

Supplied accessories

AC power cord (1)
Remote controller RMT-CZW750AD (1)

Design and specifications are subject to change without
notice.

• Abbreviation
EE : East European model
CET : East European & CIS model

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

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 dam-

aged by heat.

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

The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown 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

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick­up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY P ARTS WHOSE
P ART NUMBERS APPEAR AS SHOWN IN THIS MANU AL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

– 2 –

SERVICING NOTES

CHUCK PLATE JIG ON REPAIRING

On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.

• Code number of Chuck Plate Jig: X-4918-255-1

LASER DIODE AND FOCUS SEARCH OPERATION
CHECK

1. Turn on OPERA TE b utton and press CD button to CD position.

2. Open the CD lid.

3. Turn on S801 as following figure.

4. Press the ( P (CD) button.

5. Confirm the laser diode emission while observing the objecting
lens. When there is no emission, Auto Po wer Control circuit or
Optical Pick-up is broken.
Objective lens moves up and do wn three times for focus search.

S801

– 3 –

TABLE OF CONTENTS

1. GENERAL

Playing a CD ........................................................................... 5

Listening to the radio............................................................... 5

Playing a tape .......................................................................... 6

Recording on a tape ................................................................. 6

2. DISASSEMBLY

2-1. Cabinet Assy, Rear .............................................................. 7

2-2. Power Board........................................................................ 7

2-3. CD Block Assy....................................................................8

2-4. MD Block Assy and Record/Playback Switch Board......... 8

2-5. Main Board ......................................................................... 9

2-6. CD Board ............................................................................ 9

2-7. Optical Pick-up Section .................................................... 10

2-8. Control Board.................................................................... 10

2-9. Key Board and Lamp Board.............................................. 11

3. MECHANICAL ADJUSTMENTS............................... 12

4. ELECTRICAL ADJUSTMENTS

Tape Section .......................................................................... 12

Tuner Section......................................................................... 13

CD Section ............................................................................ 14

5. DIAGRAMS

5-1. IC Pin Description............................................................. 15

5-2. Circuit Boards Location .................................................... 16

5-3. Block Diagram –CD Section–........................................... 17

5-4. Block Diagram –Main Section–........................................ 19

5-5. Printed Wiring Boards –CD Section– ............................... 21

5-6. Schematic Diagram –CD Section–.................................... 23

5-7. Printed Wiring Boards –Control Section–......................... 25

5-8. Schematic Diagram –Control Section– ............................. 27

5-9. Printed Wiring Board –Main Section– .............................. 29

5-10. Schematic Diagram –Main Section (1/2)– ........................ 31

5-11. Printed Wiring Boards –Power Supply Section– .............. 34

5-12. Schematic Diagram –Power Supply Section–................... 37

5-13. Schematic Diagram –Main Section (2/2)– ........................ 39

6. EXPLODED VIEWS

6-1. Cabinet (Rear) Section ...................................................... 45

6-2. Cabinet (Front) Section ..................................................... 46

6-3. CD Section ........................................................................ 47

6-4. Tape Mechanism Section-1 ............................................... 48

6-5. Tape Mechanism Section-2 (Deck A) ............................... 49

6-6. Tape Mechanism Section-3 (Deck A) ............................... 50

6-7. Tape Mechanism Section-4 (Deck B) ............................... 51

6-8. Tape Mechanism Section-5 (Deck B) ............................... 52

6-9. Optical Pick-up Section .................................................... 53

6-10. Speaker Section ................................................................. 54

7. ELECTRICAL PARTS LIST......................................... 55

– 4 –

SECTION 1

GENERAL

This section is extracted
from instruction manual.

– 5 –

– 6 –

SECTION 2

4

DISASSEMBLY

• The equipment can be removed using the following procedure.

Set

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

2-1. CABINET ASSY, REAR

Cabinet assy, rear CD block assy

MD block assy and Record/
Playback Switch board

Power board

6

CNP901

2

BVTP 3x10

Main board

Control board

1

handle

7

cabinet assy, rear

CD board

Optical pick-up
section

Key board and Lamp board

2-2. POWER BOARD

2

BVTP 3x10

4

BVTP 3x14

5

BVTP 3x14

3

BVTP 3x1

5

POWER board

3

BVTP 3x10

4

BVTP 3x10

– 7 –

1

CNP902

2-3. CD BLOCK ASSY

3

8

BVTP 3x12

9

CD block assy

7

BVTP 3x12

6

BVTP 3x12

2

CNP304

1

CNP305

3

CNP30

5

CNP310

4

CNP302

2-4. MD BLOCK ASSY AND RECORD/PLAYBACK SWITCH BOARD

6

+PTT 2.6x5

3

2

BVTP 3x10

7

RECORD/
PLAYBACK
SWITCH
board

5

CNP301

BVTP 3x10

1

BVTP 3x10

4

MD block assy

– 8 –

2-5. MAIN BOARD

6

BVTP 3x10

5

BVTP 3x10

7

MAIN board

3

CNP308

1

CNP704

4

CNP307

2

KH1

8

2-6. CD BOARD

4

BVTP 3x10

3

BVTP 3x10

6

CD board

2

CNP701

1

CNP703

– 9 –

5

CNP702

2-7. OPTICAL PICK-UP SECTION

2

PWH 2.6x10 tapping

1

PWH 2.6x10 tapping

3

optical pick-up section

2-8. CONTROL BOARD

2

BVTP 3x10

4

CONTROL board

3

connector

1

BVTP 3x10

– 10 –

2-9. KEY BOARD AND LAMP BOARD

0

3

KEY board

5

LAMP board

4

BVTP 3x1

2

BVTP 3x10

1

KH806

CONTROL board

– 11 –

SECTION 3

MECHANICAL ADJUSTMENTS

SECTION 4

ELECTRICAL ADJUSTMENTS

PRECAUTION

1. Clean the following parts with a denatured alcohol-moistened
swab :

record/playback head pinch roller
erase head rubber belts
capstan idlers

2. Demagnetize the record/playback head with a head demagne­tizer. (Do not bring the head demagnetizer close to the erase
head.)

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the
parts adjusted.

5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

6. Power supply voltage: 9 V dc.

Torque Measurement DECK A DECK B

Mode Torque meter Meter reading

Forward CQ-102C

Forward
back tension (0.03 to 0.07 oz • inch)

Fast Forward
and CQ-201B
Rewind

Tape Tension Measurement DECK A DECK B

Mode Tension meter Meter reading

Forward CQ-403A

CQ-102C

22.5 to 55 g • cm

(0.31 to 0.76 oz • inch)

2 to 5 g • cm

60 to 120 g • cm

(0.83 to 1.67 oz • inch)

more than 150 g

(more than 5.29 oz)

TAPE SECTION 0 dB = 0.775 V

Standard Output Level

Output terminal SP OUT PHONES OUT

load impedance 6 Ω 32 Ω

output signal level 0.775 V (0 dB) 0.25 V (–10 dB)

Test T ape

Tape Signal Used for

WS-48A 3 kHz, 0 dB tape speed adjustment

Tape Speed Adjustment DECK A DECK B

Procedure:

• Perform normal speed adjustment before high speed check.
Mode: playback (deck A)

record (deck B)

test tape
WS-48A
(3 kHz, 0 dB)

set

PHONES jack (J301)

Adjust RV301 so that reading on digital frequency counter
becomes 3,000 Hz.

Specification Value:

Deck

A Normal (playback) RV301 2,985 to 3,015 Hz
A HI-SPEED DUBBING

B HI-SPEED DUBBING

Tape Adjustment Frequency

speed point counter

(playback)

(record)

(confirmation)

——— ———

digital frequency
counter

Ω

32

0000

5,700 to 6,500 Hz

Frequency difference between the beginning and the end of the
tape should be within ± 1.5% (both Normal and Hi-speed).

Adjustment Location: – main board (component side) –

– 12 –

RV301

)

TUNER SECTION 0 dB = 1 µV

• FM Section

Setting:

RADIO BAND switch: FM

FM RF signal
generator

FH1

0.01 µF

75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible

• MW/LW Section

Setting:

RADIO BAND switch: MW or LW

AM RF signal
generator

30% amplitude
modulation by
400 Hz signal

• Connecting Level Meter (FM, MW and LW)

Ω

32

set

PHONES jack (J301)

Antenna terminal

set

Put the lead-wire
antenna close to
the set.

level meter
(range: 0.5–5 V ac

FM FREQUENCY COVERAGE

ADJUSTMENT

Frequency Display 87.5 MHz 108 MHz
Reading on Digital voltmeter 1.6 ± 0.2 V 3.6 ± 0.2 V
Adjustment Part L2 <confirmation>

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1 (CT1)

87.5 MHz 108 MHz

( ) : Except East European model

MW FREQUENCY COVERAGE

CHECK

Frequency Display 531 kHz 1,611 kHz
Reading on Digital voltmeter 0.85 ± 0.05 V 5.0 ± 0.4 V
Adjustment Part <confirmation> <confirmation>

MW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3-1 CT3

621 kHz 1,404 kHz

MW IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1

450 kHz

LW FREQUENCY COVERAGE

ADJUSTMENT

Frequency Display 153 kHz 279 kHz
Reading on Digital voltmeter 0.6 ± 0.1 V 4.8 ± 0.4 V
Adjustment Part <confirmation> L4

• Connecting Digital Voltmeter (FM, MW and LW)

digital
voltmeter

100 k

Ω

TP (VT)

(JW17)

• Repeat the procedures in each adjustment sever al times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

L W TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3-2 CT5

162 kHz 261 kHz

Note: Adjustment procedure

1LW frequency coverage adjustment

µ

MW frequency coverage check

2MW tracking adjustment

µ

LW tracking adjustment

µ

MW tracking check

Adjustment Location: See page 14.

– 13 –

Adjustment Location: main board

– MAIN BOARD (COMPONENT SIDE) –

ANTENNA

TERMINAL

MW

TRACKING

ADJUSTMENT

FREQUENCY

COVERAGE

ADJUSTMENT

FM

TRACKING

ADJUSTMENT

FH1

CT3

L3-1

FM

CT1

L2

L1

TP (VT)
JW17

L3-2
CT5

LW
TRACKING
ADJUSTMENT

L4
LW
FREQUENCY
COVERAGE
ADJUSTMENT

T1
MW IF
ADJUSTMENT

CD SECTION

CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.

FOCUS BIAS CHECK

1. Connect the oscilloscope between IC701 pin #£ (TP RFO) and
GND on CD board.

2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)

3. Press the ^ button.

4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.

• RF signal reference waveform (eye pattern)

VOLT/DIV : 200 mV (10 : 1 probe in use)
TIME/DIV : 500 nS

RF level :

1.3

±

0.5 Vp-p

When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.

π

Test Point:

– CD board (conductor side) –

TP (RFO)

TP (RFO)

– 14 –

SECTION 5
DIAGRAMS

5-1. IC PIN DESCRIPTION

• IC801 CXP83516-601Q (SYSTEM CONTROL)

Pin No. Pin Name I/O Pin Description

1 C-SCOR/R-CNT I CD SCOR input
2 RMC I Sircs receiver input
3 CD O CD function output
4 C-MUT O CD block mute output
5 C-SEN1 I CD SENSE-1 input
6 C-SEN2 I CD SENSE-2 input
7 C-SQCK O CD Sub-Q read clock output
8 C-SQSO I CD Sub-Q data input

9 C-RST O CD reset output
10 C-CLK O CD serial clock output
11 C-LAT O CD serial latch output
12 C-DATA O CD serial data output
13 PCON O System power control output
14 RADIO O LED (RADIO BAND) drive signal output/Tuner switch
15 TAPE O LED (TAPE) drive signal output/Tape switch
16 DUB. O LED (TAPE) drive signal output/Dubbing switch
17 CLUB O LED (CLUB) drive signal output
18 JAZZ O LED (JAZZ) drive signal output
19 POP O LED (POP) drive signal output
20 ROCK O LED (ROCK) drive signal output
21 MANUAL O LED (MANUAL) drive signal output
22 TC1 I Deck A tape play switch input
23 TC2 I Deck B tape play switch input

24 – 27 KEY-1 – 4 I Key input

28 VERSION I Tuner destination band select input
29 INT/SFT-CLK O Shift clock output
30 RST I System reset input
31 EXTL I Oscillation input (4.19 MHz)
32 XTAL O Oscillation output (4.19 MHz)
33 VSS — GND
34 VL O LCD drive port ON/OFF output

35 – 37 VLC-3 – 1 O LCD drive voltage terminal
38 – 41 COM0 – 3 O LCD drive common output
42 – 64 SEG0 – 22 O LCD drive segment output

65 VL2 O LCD Bias control output
66 B-MUTE O Tuner mute signal output
67 R-LATCH O Tuner latch output
68 R-CLK O Tuner clock output
69 V-DATA/R-DATA I Tuner data input
70 V-LATCH O Graphic equalizer latch output
71 V-CLOCK O Graphic equalizer clock output
72 VDD — Power supply pin (+5 V)
73 TX O Oscillation output (32.768 kHz)
74 TXE I Oscillation input (32.768 kHz)
75 NC — Not used.
76 BL-CONT O LCD back light control signal
77 A-MUT O Audio mute output
78 REC I Tape record signal input
79 C-DOR I CD door open/close switch input
80 REGCK I Regulator check

5-2. CIRCUIT BOARDS LOCATION

LAMP board

CONTROL board

POWER board

RECORD/PLAYBACK
SWITCH board

CD MOTOR board

CD board

MAIN board

KEY board

BATTERY board

BACK UP board

– 15 – – 16 –

PHC-ZW770L

5-3. BLOCK DIAGRAM — CD SECTION —

A

C

B

D

LD

PD

E

F

OPTICAL PICK-UP

BLOCK

(KSS-213C)

TRACKING

COIL

FOCUS

COIL

M702
SLED

MOTOR

RF AMP & SYSTEM SERVO PROCESSOR

PD1

38

PD2

39

LD ON

SWITCH

Q701

VREF

M

LASER

LD

DIODE

36

CONTROL

PD

37

TRACKING

COIL

DRIVE

FOCUS

COIL

DRIVE

SLED

MOTOR

DRIVE

FE AMP

E

42

F

41

VC

51

T+

17

T-

18

F+

26

F-

27

SL+

2

SL-

1

RF AMP

IC701

SERIAL/

PARALLEL

CONVERTER

DECODER

COMMAND

VREF

23

TIN

19

FIN

25

MUTE

SLIN

TRACKING

PHASE

13

7

3

TAO

RF O

33 35

FOK

27

C. OUT

IIL

TTL

TTL

IIL

FOCUS
PHASE

FEO
6 16 7

VREF

SENS1
SENS2

DATA

XLT
CLK

XRST

24
25
26

22
21
20

23

SLO

RF

FOK

18

CNIN

11

SEIN

10

DATO

12

XLTO

13

CLKO

14

79

XRST

DIGITAL

CLV

MDP

21

EFM DEMODULATOR

SERVO

AUT

SEQ.

SPOA

15

S701

(LIMIT)

INTERFACE

XLON

DIGITAL SIGNAL PROCESSOR

D/A

SUB CODE

PROCESSOR

CPU INTERFACE

SENS

SQSO

SQCK

SCOR

574

617

5

DATA

IC703

SERIAL

INTERFACE

XLAT

CLOK

8 9 62

SYSM

DIGITAL

FILTER

CONVERTER

70•71

X701

16.9344MHz

R-CNT/ST-MO

D/A

XTAI

&

XTAO

PWM

AOUT1

AMP

PWM

AMP

MAIN

2

SECTION

LOUT1

AOUT2

LOUT2

65

67

76

74

CD L-CH

R-CH

MAIN

1

SECTION

M701

SPINDLE

MOTOR

04

M

SP+
SP-

SP0

SPINDLE

MOTOR

DRIVE

OPTICAL PICK-UP

DRIVE
IC702

SPIN

9

SPIN

15

­+

VREF

16

VREF

9

C-RST

SYSTEM CONTROL

IC801 (1/2)

1

5

8

7

6

C-SEN1

C-SEN2

C-SQCK

C-SQSO

CD

11

12

C-DATA

C-SOR/R-CNT

10

C-CLK

C-XLAT

4

C-MUT

• Signal path
: CD

• R-ch : same as L-ch.

12
11

14

– 17 – – 18 –