Sony PHC-ZW770L User manual

– 1 –
CD Model Name Using Similar Mechanism PMC-D305L
Section CD Mechanism Type KSM-213CDM
Optical Pick-up Name KSS-213C
TC Model Name Using Similar Mechanism NEW
Section Tape Transport Mechanism Type MF-ZW750-117
SERVICE MANUAL
AEP Model
UK Model
E Model
PHC-ZW770L
PERSONAL AUDIO SYSTEM
MICROFILM
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
– Continued on next page –
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
Ver 1.0 1999. 03

– 2 –
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 PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
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)
(24 7/8 ×10 5/8 ×10 1/8 inches) (incl. projecting parts)
MassApprox. 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
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous 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 pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
This Compact Disc player is
classified as a CLASS 1
LASER product.
The CLASS 1 LASER
PRODUCT label is located
on the bottom exterior.

– 3 –
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 OPERATE button 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 Power Control circuit or
Optical Pick-up is broken.
Objective lens moves up and down three times for focus search.
S801
SERVICING NOTES

– 4 –
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. EXPLODEDVIEWS
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

– 5 –
SECTION 1
GENERAL This section is extracted
from instruction manual.

– 6 –

– 7 –
• The equipment can be removed using the following procedure.
2-2. POWER BOARD
SECTION 2
DISASSEMBLY
Set Cabinet assy, rear CD block assy
MD block assy and Record/
Playback Switch board
Power board
Main board
Control board
CD board Optical pick-up
section
Key board and Lamp board
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET ASSY, REAR
2 BVTP 3x10
3 BVTP 3x1
4
5 BVTP 3x14
4 BVTP 3x14
1 handle
7 cabinet assy, rear
6 CNP901
2 BVTP 3x10
5 POWER board
3 BVTP 3x10
4 BVTP 3x10 1 CNP902

– 8 –
2-3. CD BLOCK ASSY
2-4. MD BLOCK ASSY AND RECORD/PLAYBACK SWITCH BOARD
9 CD block assy
7 BVTP 3x12
6 BVTP 3x12
5 CNP310
4 CNP302
3 CNP30
3
1 CNP305
2 CNP304
8 BVTP 3x12
2 BVTP 3x10
6 +PTT 2.6x5
3 BVTP 3x10
1 BVTP 3x10
4 MD block assy
7 RECORD/
PLAYBACK
SWITCH
board
5 CNP301

– 9 –
2-5. MAIN BOARD
2-6. CD BOARD
6 BVTP 3x10
5 BVTP 3x10
7 MAIN board
3 CNP308
1 CNP704
4 CNP307
2 KH1
8
4 BVTP 3x10
3 BVTP 3x10
6 CD board
2 CNP701
5 CNP702
1 CNP703

– 10 –
2-7. OPTICAL PICK-UP SECTION
2-8. CONTROL BOARD
2 PWH 2.6x10 tapping
1 PWH 2.6x10 tapping
3 optical pick-up section
2 BVTP 3x10
1 BVTP 3x10
4 CONTROL board
3 connector

– 11 –
2-9. KEY BOARD AND LAMP BOARD
4 BVTP 3x1
0
1 KH806
3 KEY board
CONTROL board
5 LAMP board
2 BVTP 3x10

– 12 –
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 demagne-
tizer. (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 22.5 to 55 g • cm
(0.31 to 0.76 oz • inch)
Forward CQ-102C 2 to 5 g • cm
back tension (0.03 to 0.07 oz • inch)
Fast Forward 60 to 120 g • cm
and CQ-201B (0.83 to 1.67 oz • inch)
Rewind
TapeTension Measurement DECK A DECK B
Mode Tension meter Meter reading
Forward CQ-403A more than 150 g
(more than 5.29 oz)
SECTION 4
ELECTRICAL ADJUSTMENTS
SECTION 3
MECHANICAL ADJUSTMENTS
TAPE SECTION 0 dB = 0.775V
Standard Output Level
Output terminal SP OUT PHONES OUT
load impedance 6 Ω32 Ω
output signal level 0.775 V (0 dB) 0.25 V (–10 dB)
TestTape
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)
Deck Tape Adjustment Frequency
speed point counter
A Normal (playback) RV301 2,985 to 3,015 Hz
A HI-SPEED DUBBING
(confirmation) 5,700 to 6,500 Hz
(playback)
B HI-SPEED DUBBING ——— ———
(record)
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) –
0000
PHONES jack (J301)
digital frequency
counter
set
32
Ω
test tape
WS-48A
(3 kHz, 0 dB)
RV301
Adjust RV301 so that reading on digital frequency counter
becomes 3,000 Hz.
Specification Value:

– 13 –
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>
FMTRACKING 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>
MWTRACKING 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
LWTRACKING 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.
digital
voltmeter
100 k
Ω
TP (VT)
(JW17)
PHONES jack (J301)
set
32
Ω
level meter
(range: 0.5–5 V ac
)
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
FH1
Antenna terminal
FM RF signal
generator
0.01 µ F
set
TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
RADIO BAND switch: FM
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
• MW/LW Section
Setting:
RADIO BAND switch: MW or LW
30% amplitude
modulation by
400 Hz signal
• Connecting Level Meter (FM, MW and LW)
• Connecting DigitalVoltmeter (FM, MW and LW)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

– 14 –
TP (RFO)
TP (RFO)
Adjustment Location: main board
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)
π
Test Point:
RF level :
1.3
± 0.5 Vp-p
VOLT/DIV : 200 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope forAC range
and raise vertical sensitivity.
LW
TRACKING
ADJUSTMENT
FH1
ANTENNA
TERMINAL
TP (VT)
JW17
L2
FM
FREQUENCY
COVERAGE
ADJUSTMENT
L4
LW
FREQUENCY
COVERAGE
ADJUSTMENT
T1
MW IF
ADJUSTMENT
FM
TRACKING
ADJUSTMENT
CT1
L1
L3-2
CT5
MW
TRACKING
ADJUSTMENT
CT3
L3-1
– MAIN BOARD (COMPONENT SIDE) –
– CD board (conductor side) –

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
SECTION 5
DIAGRAMS
5-2. CIRCUIT BOARDS LOCATION
LAMP board
CD MOTOR board
CD board
MAIN board
KEY board
CONTROL board
BATTERY board
POWER board
BACK UP board
RECORD/PLAYBACK
SWITCH board
– 15 – – 16 –

PHC-ZW770L
– 17 – – 18 –
5-3. BLOCK DIAGRAM — CD SECTION —
M
38 33 35
18
11
10
12
13
14
79
23
20
21
22
26
25
24
• Signal path
• R-ch : same as L-ch.
: CD
27
PD1 RF AMP
FE AMP
39
36
37
PD2
LD
PD
E
F
VC
42
41
51
17
18 19
23
13
LD ON
SWITCH
Q701
LASER
DIODE
CONTROL SERIAL/
PARALLEL
CONVERTER
DECODER
RF O
FOK
C. OUT
SENS1
SENS2
IIL
TTL
DATA
XLT
CLK
XRST
TTL
IIL
TRACKING
PHASE FOCUS PHASE
COMMAND
6 16 7
574
5
617
15
21 8 9 62
65
67
TAO FEO
SLO
RF AMP & SYSTEM SERVO PROCESSOR
IC701 DIGITAL SIGNAL PROCESSOR
IC703
VREF
TRACKING
COIL
DRIVE
26
27 25
7
3
9
FOCUS
COIL
DRIVE
T+
F+
F-
T-
2
1
SLED
MOTOR
DRIVE
12
11
14
SPINDLE
MOTOR
DRIVE
SL+
SP+
SP-
SP0
SL-
TRACKING
COIL
FOCUS
COIL
A
C
B
D
E
F
LD
PD
OPTICAL PICK-UP
BLOCK
(KSS-213C)
TIN
FIN
MUTE
SLIN
SPIN
15
16
SPIN
VREF VREF
VREF VREF
-
+
OPTICAL PICK-UP
DRIVE
IC702
M702
SLED
MOTOR
M
M701
SPINDLE
MOTOR
9
C-RST
6
C-SEN2
5
C-SEN1
8
C-SQSO
7
C-SQCK
1
C-SOR/R-CNT
10
C-CLK
4
C-MUT
11
C-XLAT
12
C-DATA
RF
FOK
CNIN
SEIN
DATO
XLTO
CLKO
XRST
MDP SPOA XLON SENS SQSO SQCK SCOR DATA XLAT CLOK SYSM
XTAI XTAO
SERVO
AUT
SEQ.
EFM DEMODULATOR
SERIAL
INTERFACE
D/A
INTERFACE
SUB CODE
PROCESSOR
CPU INTERFACE
DIGITAL
CLV
S701
(LIMIT)
SYSTEM CONTROL
IC801 (1/2)
70•71
X701
16.9344MHz
DIGITAL
FILTER
&
D/A
CONVERTER
AOUT1
LOUT1
76
74
AOUT2
LOUT2
CD L-CH
R-CH
1MAIN
SECTION
R-CNT/ST-MO 2MAIN
SECTION
PWM
AMP
PWM
AMP
CD
04

– 19 – – 20 –
5-4. BLOCK DIAGRAM — MAIN SECTION —
PHC-ZW770L
M
23
78
6717 18 19 2021 68
2 4
31 32 29 30 66
38–41
76
12 3
CD L-CH
S301-1
REC
PB
R-CH
1
32
19
29
30
10 728
27
14
15
12 20
A-L
B-L
BIAS
BIAS
TR-C
BIAS
TR-B
TU-L
AGC-T
CD-L
REC EQ
BIAS
OSC LOGIC
MIC/HS A/B NOR/HI
FUNCTION
OUT-L
OUT-R
REC/PB
PRE AMP
IC301
RV301
TAPE
SPEED
Q306
M301
(CAPSTAN/REEL)
A
B
–+
ISS1
Q318
ISS3
Q319
Q316
Q307
Q304
T301
BIAS
OSC
Q317
MD
POWER
DETECTOR
Q340
R-CH
R-CH
R-CH
L-CH
HRP301
RECORD/
PLAYBACK
HEAD
(DECK B)
L-CH
R-CH
HP301
PLAYBACK
HEAD
(DECK A)
1
CD SECTION
R-CNT/ST-MO
2
CD SECTION
S304
(MD POWER)
DECK A
S307
(MD POWER)
DECK B 9V
9V
S301-3
REC
PB
REC
79 C-DOR
COM0 ROCK POP JAZZ CLUB MANUAL COM3
42–64
73•74
SEG0 SEG22 R-LATCH R-CLK
LCD801
LED
SWITCH
Q807
5 BAND
GRAPHIC
EQUALIZER D806-809
TUNER TUNER
POWER AMP
IC304
Q101
Q323
17
2 1 22 21 20
13
4
GRAPHIC
EQUALIZER
CONTROLLER
VOLUME/SOUND CONTROL
IC302
IC803
5 BAND PROCESSOR
IN2
OUT2
100 400
1K 4K
10K
VOL
SP901
SPEAKER
(L-CH)
R-CH R-CH J301
PHONES
Q301
Q302
Q305
Q303
S306
(MD PLAY)
DECK B
S801
CD DOOR
OPEN/CLOSE
22
S305
(MD PLAY)
DECK A
16
DUB
14
RADIO
3
CD
69
V-DATA/R-DATA
71
V-CLOCK
70
V-LATCH
15
TAPE
TC2 TC1
TUNER
TAPE
CD
X802
32.768KHz
X801
4.19MHz
CLOCK
SHIFT
Q801
CLOCK
SHIFT
Q802
RESET
IC802
B/UP +5V REM +B
RST B-MUTE
2
SIRCS
RECEIVER
IC811
RMC
13
PCON
80
REGCK INT/SFT-CLK
28
VERSION XTAL
EXCEPT EE
24
KEY1
25
KEY2
26
KEY3
27
KEY4 EXTL
TXE
TX
BL-CONT 77
A-MUTE
LAMP ON
SWITCH
Q334, 335
CD 5V
SWITCH
Q313, 314
TUNER 6V
SWITCH
Q311, 312
PL801–803
CD 5V
CD
TUNER
6V
TUNER
CE
CK
19
12 13 21 20 8
5
10
1314 17
19
20
2124
22 4 6
16 15 11
12
10
2
LP-OUT
AM-IN FM-IN
6 7
LW MW X-OUT ST-IND X-IN IF-IN MO/ST BAND
X1
75KHz
14 9
18
11
AM
OSC
FM
OSC
AM
MIX
FM
MIX
AM
RF-IN
AM
OSC
MIX
OUT
FM OSC
FM
RF-IN
FM RF- OUT
IF
BUFFER
LPF1/
MO/ST
LPF2/BAND
AM
DET
7FM
DET
AF
BUFFER FM
MPX MUTE R-CH
QUAD
R-OUT
MPX-
IN
DET-
OUT L-OUT
CF3
CF2
CF1
CF4
AM CERAMIC
FILTER
T1
IF
TRANSFORMER
AM
IF-IN
FM
IF-IN
D1 D2
CT1
L1
FM-RF L2
FM-OSC
CT3 -2
LW -1 MW
CT5
L3
MW/LW
FERRITE-ROD
ANTENNA
04
BPF
FL1
MW SW
Q40-42
LW SW
Q2,43,44
REG
Q61
ANT1
FM
TELESCOPIC
ANTENNA
D3
L4
MW/LW-OSC
FM/MW/LW
FRONT-END,
IF DET, FM STEREO
DEMODULATOR
IC1
SYSTEM CONTROL
IC801 (2/2)
PLL
IC2
S301-4
HIGH
NORMAL
3
1
OSC-
OUT
• Signal path
: FM
: AM
: PLAY (DECK A)
: PLAY (DECK B)
: REC (DECK B)
: CD
• R-ch : same as L-ch.
• Abbreviation
EE : East European model
SP : Singapore model
1
3
S301
ISS
3 2 1
9V
TUNER
6V TUNER 6V
TUNER
6V
TUNER
6V TUNER
6V
TUNER
6V
TUNER
6V
IF-OUT
ST-IND
3
DI
DO
LED
SWITCH
Q808-810
DUBBING
SWITCH
Q308-310
1KHz BAND
DETECTOR
Q315
5 BAND GRAPHIC EQUALIZER
RV401-405
MEGA BASS
DETECTOR
Q321, 322
S303
HIGH-SPEED
DUBBING
D906 D907
D908
D321
BACK UP
SWITCH
Q320, 324, 325,
327-329
POWER
SWITCH
Q338, 339
6V REG
(FOR AUDIO)
Q331
6.2V REG
(FOR CD)
Q333
REG. CHECK &
REM+B SWITCH
Q336, 337
J901
~ AC IN
D814
OPR/BATT
D810
MANUAL
T901
POWER
TRANSFORMER
23
IC305
BACK UP 5V IC
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
3PCS, 4.5V
(BACK UP)
DRY BATTERY SIZE "D"
(IEC DESIGNATION R20)
6PCS, 9V (POWER)
REM+B
B/UP
+5V
9V
VT 9V
CD 6.2V
R367 9V
6V
7.5V REG
(FOR B/L)
Q332 RECT
D905, 909-911
RECT
D901-904
5V REG
(FOR CD/TUNER)
Q330
TUNER 5V
9V
R901
F901
5A 125V (SP)
3.15A 250V (EXCEPT SP)
D811–813
6V
S824-827 S816-823 S808-815 S803-807
12
11
10
9
6
4
3
2
5
A06/10KHz
DATA
CLK
LAT
A05/4KHz
A04/1KHz
A03/400Hz
A02/100Hz
A01/VR
EQ10K
EQ4K EQ1K
EQ400 EQ100
6V
6V
VT9V
BAND
IF REQ
Q13
L2
FM
FREQUENCY
COVERAGE
CT3, L3-1
MW
TRACKING
CT5, L3-2
LW
TRACKING
L4
LW
FREQUENCY
COVERAGE
CT1, L1
FM
TRACKING
EXCEPT EE

1
A
B
C
D
E
F
G
H
234567891011
CD MOTOR BOARD
1-658-023-
S701
(LIMIT)
S701
(SPINDLE)
CNP707 16
M
M702
(SLED)
M
X201
C758
FB705
TP (RFO)
31
(31)
1-672-179-
21
(21)
04
5-5. PRINTEDWIRING BOARDS — CD SECTION — • Refer to page 16 for Circuit Boards Location.
PHC-ZW770L
– 21 – – 22 –
Note on Printed Wiring Boards:
•X: parts extracted from the component side.
•b: Pattern from the side which enables seeing.
Ref.No. Location
D701 D-8
D702 G-8
D703 C-6
IC701 F-4
IC702 C-3
IC703 F-7
Q701 F-2
• Semiconductor
Location
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
•U: B+ Line.
• Power voltage is dc 9 V and fed with regulated dc power
supply from battery terminal.
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD STOP
• Voltages are taken with aVOM(Inputimpedance10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
J: CD
(Page 30) (Page 25)
Note: The components identified by mark !or dotted line
with mark !are critical for safety.
Replace only with part number specified.

5-6. SCHEMATIC DIAGRAM — CD SECTION — • Refer to page 22 for Note on Schematic Diagram.
• Refer to page 41 for IC Block Diagrams.
– 23 – – 24 –
PHC-ZW770L
(Page 33) (Page 27)
Approx. 100mVp-p
IC701 $¶ (TEI)
• Waveforms (MODE:PLAY)
1
2
3
4
5
2.5V
1.3±0.5Vp-p
Approx. 200mVp-p
IC701 1(FEO)
2.5V
IC703 @¡ (MDP)
2Vp-p
7.6µsec
16.9344MHz
IC703 &¡ (XTAO)
2.2Vp-p
IC701 #£ (RFO)

5-7. PRINTEDWIRING BOARDS — CONTROL SECTION — • Refer to page 16 for Circuit Boards Location.
PHC-ZW770L
– 25 – – 26 –
1
A
B
C
D
E
F
G
H
I
2345678910111213
PRESET
R849
L802
(TEST A)
(TEST B)
D815
CNJ804
(EXCEPT EE)
(EE)
S801
(CD DOOR OPEN/CLOSE)
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
•C: panel designation.
•U: B+ Line.
• Power voltage is dc 9 V and fed with regulated dc power
supply from battery terminal.
• Voltage is dc with respect to ground under no-signal
(detuned) condition.
no mark : FM
( ) : PB (TAPE)
< > : DUBBING
[ ] : CD STOP
• Voltages are taken with aVOM(Inputimpedance10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Abbreviation
EE : East European model
Note on Printed Wiring Boards:
•X: parts extracted from the component side.
•b: Pattern from the side which enables seeing.
Ref. No. Location
D801 G-9
D804 E-5
D805 E-5
D806 D-4
D807 E-4
D808 E-4
D809 F-4
D810 F-4
D811 H-4
D812 I-4
D813 I-4
D814 H-2
D815 D-10
IC801 G-6
IC802 H-2
IC803 E-9
IC811 B-9
Q801 I-5
Q802 H-4
Q807 F-5
Q808 G-3
Q809 I-4
Q810 I-5
• Semiconductor
Location
(Page 22) (Page 29) (Page 30)
• Abbreviation
EE : East European model