Sony CFDZW-750, CFDZW-770 Service manual
CFD-ZW750/ZW770
SERVICE MANUAL
Ver 1.0 1999. 01
Photo : CFD-ZW770
SPECIFICATIONS
AUDIO POWER SPECIFICATIONS (US Model)
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION
CFD-ZW750:
With 3.2-ohm loads, both channels driven
from 150 - 8,000 Hz; rated 2 W per channelminimum RMS power, with no more than
10% total harmonic distortion in AC
operation.
CFD-ZW770:
With 6-ohm loads, both channels driven
from 150 - 8,000 Hz; rated 3.6 W per channelminimum RMS power, with no more than
10% total harmonic distortion in AC
operation.
CD
Section
TC
Section
US Model
Canadian Model
Model Name Using Similar Mechanism PMC-D305
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
Other Specifications
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: 87.6 - 108 MHz
AM: 530 - 1,710 kHz
Antennas
FM: Telescopic antenna
AM: Built-in ferrite bar antenna
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
– Continued on next page –
CD RADIO CASSETTE-CORDER
MICROFILM
– 1 –
General
Speaker
CFD-ZW750:
Full range: 10 cm (4 in.) dia.,
3.2 ohms, cone type (2)
CFD-ZW770:
Full range: 10 cm (4 in.) dia.,
6 ohms, cone type (2)
Outputs
Headphones jack (stereo minijack)
For 16 - 68 ohms impedance headphones
Power output (excluding US model)
CFD-ZW750:
2.3 W + 2.3 W (at 3.2 ohm, 10% harmonic
distortion in AC operation)
CFD-ZW770:
3.8 W + 3.8 W (at 6 ohm, 10% harmonic
distortion in AC operation)
Power requirements
For CD radio cassette-corder:
120 V AC, 60 Hz
9 V DC, 6 size D (R20) batteries
For memory back-up:
4.5 V DC, 3 size AA (R6) batteries
For remote controller:
3 V DC, 2 size AA (R6) batteries
Power consumption
CFD-ZW750: AC 15 W
CFD-ZW770: AC 28 W
Battery life
For CD radio cassette-corder:
FM recording CFD-ZW750 CFD-ZW770
Sony R20P: approx. 7.5 h approx. 3.5 h
Sony alkaline LR20: approx. 22 h approx. 10 h
Tape playback
Sony R20P: approx. 7 h approx. 1.5 h
Sony alkaline LR20: approx. 20 h approx. 5 h
CD playback
Sony R20P: approx. 3 h approx. 1.5 h
Sony alkaline LR20: approx. 10 h 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
CFD-ZW750:
Approx. 6.7 kg (14 lb. 12 oz.) (incl. batteries)
CFD-ZW770:
Approx. 7.9 kg (17 lb. 7 oz.) (incl. batteries)
Supplied accessories
AC power-cord (1)
Remote controller (1) (RMT-CZW750A)
Design and specifications are subject to change without
notice.
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.
ATTENTION AU COMPOSANT A YANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES
DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
– 2 –
SERVICING NOTES
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a V OM
or battery-operated A C v oltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale. The
Simpson 250 and Sanwa SH-63Trd are examples of a passive
VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
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 POWER 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 Po wer Control circuit or
Optical Pick-up is broken.
Objective lens moves up and do wn three times for focus search.
To Exposed Metal
Parts on Set
0.15
µ
F
1.5k
Ω
Earth Ground
AC
voltmeter
(0.75V)
Fig. A. Using an AC voltmeter to check AC leakage.
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, REC 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, 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–
(for CFD-ZW750/ZW770) ............................................... 21
5-6. Schematic Diagram –CD Section–
(for CFD-ZW750/ZW770) ............................................... 23
5-7. Printed Wiring Boards –Control Section–
(for CFD-ZW750/ZW770) ............................................... 25
5-8. Schematic Diagram –Control Section–
(for CFD-ZW750/ZW770) ............................................... 27
5-9. Printed Wiring Board –Main Section–
(for CFD-ZW750) ............................................................ 29
5-10. Schematic Diagram –Main Section (1/2)–
(for CFD-ZW750) ............................................................ 31
5-11. Printed Wiring Boards –Power Supply Section–
(for CFD-ZW750) ............................................................ 35
5-12. Schematic Diagram –Power Supply Section–
(for CFD-ZW750) ............................................................ 37
5-13. Printed Wiring Board –Main Section–
(for CFD-ZW770) ............................................................ 39
5-14. Schematic Diagram –Main Section (1/2)–
(for CFD-ZW770) ............................................................ 41
5-15. Printed Wiring Boards –Power Supply Section–
(for CFD-ZW770) ............................................................ 44
5-16. Schematic Diagram –Power Supply Section–
(for CFD-ZW770) ............................................................ 47
5-17. Schematic Diagram –Main Section (2/2)–
(for CFD-ZW750/ZW770) ............................................... 49
6. EXPLODED VIEWS
6-1. Rear Cabinet Section.........................................................55
6-2. Front Cabinet Section........................................................ 56
6-3. CD Section ........................................................................ 57
6-4. Tape Mechanism Section-1 ............................................... 58
6-5. Tape Mechanism Section-2 (Deck A) ............................... 59
6-6. Tape Mechanism Section-3 (Deck A) ............................... 60
6-7. Tape Mechanism Section-4 (Deck B) ............................... 61
6-8. Tape Mechanism Section-5 (Deck B) ............................... 62
6-9. Optical Pick-up Section .................................................... 63
6-10. Speaker Section .................................................................64
7. ELECTRICAL PARTS LIST......................................... 65
– 4 –
SECTION 1
GENERAL
This section is extracted
from instruction manual.
– 5 –
– 6 –
SECTION 2
y
4
DISASSEMBLY
• The equipment can be removed using the following procedure.
Set
Cabinet assy, rear CD block assy
MD block assy, REC board
Main board
CD board
Optical pick-up
section
Power board
Note : Follow the disassembly procedure in the n umerical order given.
2-1. CABINET ASSY, REAR
6
CNP901
Control Board
2
BVTP 3x10
1
handle
Ke
board, Lamp board
7
cabinet assy, rear
3
BVTP 3x1
2-2. POWER BOARD
5
POWER board
3
BVTP 3x10
2
BVTP 3x10
4
BVTP 3x14
5
BVTP 3x14
4
BVTP 3x10
– 7 –
1
CNP902
2-3. CD BLOCK ASSY
8
BVTP 3x12
9
CD block assy
7
BVTP 3x12
6
BVTP 3x12
2
CNP304
1
CNP305
3
CNP303
5
2-4. MD BLOCK ASSY, REC BOARD
6
+PTT 2.6x5
7
REC board
5
CNP301
CNP310
4
CNP302
2
BVTP 3x10
3
BVTP 3x10
1
BVTP 3x10
4
MD block assy
– 8 –
2-5. MAIN BOARD
d
6
BVTP 3x10
3
CNP308
4
CNP307
2
KH1
5
BVTP 3x10
7
MAIN boar
2-6. CD BOARD
4
BVTP 3x10
3
BVTP 3x10
6
CD board
1
CNP704
1
CNP703
2
CNP701
5
CNP702
– 9 –
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, LAMP BOARD
0
3
KEY board
2
BVTP 3x10
1
KH806
5
LAMP board
4
BVTP 3x1
– 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
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)
TAPE SECTION 0 dB = 0.775 V
Standard Output Level
Output terminal SP OUT PHONES OUT
load impedance 3.2 Ω <6 Ω> 32 Ω
output signal level 0.775 V (0 dB) 0.25 V (–10 dB)
< >: CFD-ZW770
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
digital frequency
counter
32
Ω
0000
Tape Tension Measurement DECK A DECK B
Mode Tension meter Meter reading
Forward CQ-403A
more than 150 g
(more than 5.29 oz)
PHONES jack
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
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) –
Tape Adjustment Frequency
speed point counter
(playback)
(record)
(confirmation)
——— ———
5,700 to 6,500 Hz
– 12 –
RV301
)
TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
RADIO BAND button: FM
FM RF signal
generator
µ
F
0.01
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
• AM Section
Setting:
RADIO BAND button: AM
FH1
set
FM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display 87.5 MHz 108 MHz
Reading on Digital voltmeter 1.6 ± 0.2 V 3.8 ± 0.3V
Adjustment Part <confirmation> L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 CT1
87.5 MHz 108 MHz
AM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display 530 kHz 1,710 kHz
Reading on Digital voltmeter 0.85 ± 0.05 V 5.1 ± 0.3V
Adjustment Part <confirmation> <confirmation>
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Put the lead-wire
antenna close to
the set.
• Connecting Level Meter (FM and AM)
level meter
(range: 0.5–5 V ac
32
Ω
set
PHONES jack
• Connecting Digital Voltmeter (FM and AM)
digital
voltmeter
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 CT2
620 kHz 1,400 kHz
• For AM adjustment, fix the ferrite-rod antenna (L3) as shown
below and then perform tracking adjustment at L4 and CT2.
Lastly check the voltage.
3.0 ± 1.0 mm
L3
FERRITE-ROD
ANTENNA
Adjustment Location: See page 14.
100 k
Ω
TP (VT)
(JW13)
• Repeat the procedures in each adjustment se veral times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
– 13 –
Adjustment Location: main board
TRACKING
ADJUSTMENT
TRACKING
ADJUSTMENT
FH1
ANTENNA
TERMINAL
L3
CT2
AM
L4
CT1
FM
L1
– MAIN BOARD (COMPONENT SIDE) –
L2
FREQUENCY
COVERAGE
ADJUSTMENT
FM
TP (VT)
JW13
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
π
Test Point:
– CD board (conductor side) –
TP (RFO)
TP (RFO)
RF level :
±
0.5 Vp-p
1.3
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
– 14 –
SECTION 5
DIAGRAMS
5-1. IC PIN DESCRIPTION
• IC801 CXP83620-001Q (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 (CFD-ZW770 only)/Tuner switch
15 TAPE O LED (TAPE) drive signal output (CFD-ZW770 only)/Tape switch
16 DUB. O LED (TAPE) drive signal output (CFD-ZW770 only)/Dubbing switch
17 CLUB O LED (CLUB) drive signal output (CFD-ZW770 only)
18 JAZZ O LED (JAZZ) drive signal output (CFD-ZW770 only)
19 POP O LED (POP) drive signal output (CFD-ZW770 only)
20 ROCK O LED (ROCK) drive signal output (CFD-ZW770 only)
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 –
CFD-ZW750/ZW770
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
COMAND
VREF
23
TIN
19
FIN
25
MUTE
SLIN
TRACKING
PHASE
7
3
13
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
2
MAIN
SECTION
PWM
AMP
PWM
AMP
AOUT1
LOUT1
AOUT2
LOUT2
R-CH
CD L-CH
1
MAIN
SECTION
65
67
76
74
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 –
5-4. BLOCK DIAGRAM — MAIN SECTION —
CFD-ZW750/ZW770
HP301
PLAYBACK
HEAD
(DECK A)
HRP301
RECORD/
PLAYBACK
HEAD
(DECK B)
S304
(MD POWER)
DECK A
S307
(MD POWER)
DECK B
ANT1
FM
TELESCOPIC
ANTENNA
04
R-CH
L-CH
L-CH
R-CH
S301-3
REC
PB
S801
CD DOOR
OPEN/CLOSE
MANUAL
5 BAND
GRAPHIC
EQUALIZER
ZW750
DETECTOR
D810
CT2
MD
POWER
Q340
9V
9V
R-CH
R-CH
ISS3
Q319
Q317
LED
SWITCH
Q807
6V
D3
L3
AM
FERRITE-ROD
ANTENNA
TUNER
BPF
FL1
CD SECTION
1
ISS1
Q318
3 2 1
78
REC
79
C-DOR
MANUAL
ZW770
L4
AM-OSC
TUNER
6V
6V
CD L-CH
Q316
S301
ISS
CLUB
D806-809
FM-RF
JAZZ
6V
L1
S301-1
PB
(CAPSTAN/REEL)
9V
ROCK
POP
AM
RF-IN
22
FM
RF-IN
2
TUNER
6V
REC
T301
BIAS
OSC
A
M
B
COM0
38–41
19
FM
CT1
M301
–+
COM3
LCD801
LP-OUT
AM
RF-
OUT
CD-L
12
A-L
1
B-L
32
BIAS
19
BIAS
TR-C
29
30
BIAS
OSC
BIAS
TR-B
Q306
RV301
TAPE
SPEED
TUNER
SEG0
SEG22
R-LATCH
R-CLK
6717 18 19 2021 68
42–64
2 4
CE
CK
AM-IN
FM-IN
12 13 21 20 8
20
OSC
AM
OSC
AM
MIX
D1
FM
D2
FM
MIX
FM
OSC
2124
OSC
OSC-
19
OUT
TUNER
6V
FM-OSC
20
AGC-T
REC EQ
LOGIC
MIC/HS
TU-L
10
7
S301-4
HIGH
Q307
NORMAL
SYSTEM CONTROL
IC801 (2/2)
EXTL
31 32 29 30 66
X801
4.19MHz
CLOCK
SHIFT
Q802
PLL
IC2
X-OUT
ST-IND
MO/ST
14 9
X1
75KHz
18
FM/AM FRONT-END,
LPF1/
MIX
OUT
L2
MO/ST
IF DET, FM STEREO
DEMODULATOR
ST-IND
CFT1
6V
TUNER
6V
D10
AM IFT
CF1
4 6
TUNER
REC/PB
PRE AMP
IC301
OUT-R
OUT-L
FUNCTION
A/B
NOR/HI
28
XTAL
CLOCK
SHIFT
Q801
X-IN
IC1
TUNER
15
14
27
Q304
23
6V
HIGH-SPEED
DUBBING
S305
(MD PLAY)
DECK A
(MD PLAY)
TC2
RST
INT/SFT-CLK
3
RESET
IC802
1
B/UP +5V
AM
IF-IN
7
FM
IF-IN
S303
Q305
DUBBING
SWITCH
Q308-310
R-CH
X802
32.768KHz
S306
DECK B
TUNER
11
17
IF-OUT
IF
BUFFER
IF-IN
73•74
22
TC1
B-MUTE
S824-827 S816-823 S808-815 S803-807
BAND
BAND
1314
LPF2/BAND
AM
DET
FM
DET
QUAD
10
CF2
TUNER
6V
69
71
70
TX
TXE
V-LATCH
V-CLOCK
V-DATA/R-DATA
KEY1
24
DI
DO
3
7
5
AF
BUFFER
KEY2
25
Q1
DET-
OUT
16
5 BAND PROCESSOR
4
DATA
3
CLK
2
LAT
Q303
Q301
Q302
KEY3
26
IC803
16
14
DUB
R-CNT/ST-MO
MPX-
IN
15
A06/10KHz
A05/4KHz
A04/1KHz
A03/400Hz
A02/100Hz
A01/VR
TAPE
3
15
CD
RADIO
KEY4
27
FM
MPX
12
11
10
TUNER
TAPE
RECEIVER
CD SECTION
1KHz BAND
DETECTOR
Q315
9
6
5
MEGA BASS
DETECTOR
Q321, 322
CD
ZW770
LED
SWITCH
Q808-810
BL-CONT
A-MUTE
RMC13PCON80REGCK
2
1
SIRCS
IC811
3
REM +B
2
R-OUT
MUTE
L-OUT
5 BAND GRAPHIC EQUALIZER
RV401-405
EQ4K
EQ1K
EQ400
EQ100
2 1 22 21 20
100
CONTROLLER
IC302
PL801–803
CD 5V
CD
TUNER
6V
TUNER
TUNER 5V
ZW770
CD 6.2V
B/UP
+5V
REG. CHECK &
Q336, 337
400
Q313, 314
TUNER 6V
Q311, 312
GRAPHIC
17
EQUALIZER
IN2
VOLUME/SOUND CONTROL
76
77
REM+B
R-CH
REM+B SWITCH
11
12
1K
4K
LAMP ON
SWITCH
Q334, 335
ZW770
CD 5V
SWITCH
SWITCH
6V
9V
VT 9V
BACK UP
SWITCH
Q320, 324, 325,
327-329
(IEC DESIGNATION R6)
EQ10K
10K
OUT2
VOL
D321
IC305
BACK UP 5V IC
DRY BATTERY
SIZE "AA"
3PCS, 4.5V
(BACK UP)
13
4
Q323(ZW770)
Q332(ZW750)
Q811–813
ZW770
ZW770
7.5V REG
(FOR B/L)
Q332
9V
5V REG
(FOR CD/TUNER)
Q330
6V REG
(FOR AUDIO)
Q331
POWER
SWITCH
Q338, 339
6.2V REG
(FOR CD)
Q333
23
DRY BATTERY SIZE "D"
(IEC DESIGNATION R20)
6PCS, 9V (POWER)
D814
OPR/BATT
D908
D906
12 3
Q101
6V
RECT
D901-904
D905, 909-911
D907
POWER AMP
IC304
RECT
ZW750
TUNER
5V
F901
R901
R367
R-CH
R-CH
T901
POWER
TRANSFORMER
ZW770
5V REG
(FOR CD/TUNER)
Q330
9V
• Signal path
J301
PHONES
SP901
SPEAKER
(L-CH)
9V6V
6V REG
(FOR AUDIO)
Q331
: FM
: AM
: PLAY (DECK A)
: PLAY (DECK B)
: REC (DECK B)
: CD
J901
~ AC IN
• R-ch : same as L-ch.
– 19 – – 20 –
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