Sony WALKMAN WM-GX680, Service Manual

Page: 14 / 32

WM-GX680/GX688
SECTION 6
DIAGRAMS
— 13 — — 14 — — 15 —
6-1. BLOCK DIAGRAM
• Waveform
Note on Printed Wiring Board:
• Y
: parts extracted from the conductor side.
•
b
: Pattern from the side which enables seeing.
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
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
C
: panel designation.
• A : B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
Main board (1/3)
no mark : FM/AM, TAPE STOP
(
) : FM
[ ] : AM
< > : TAPE PB
Main board (2/3), (3/3)
no mark : REC / PB
(
) : REC
[ ] : PB
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
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.
E
: PB
a : REC
F
: FM
51.7kHz
1
TP32
20
µ
sec/div
5V/div
2
IC2
!¶
VCO 5
µ
sec/div
50mV/div
3
IC801
5
PLAY BACK mode
75kHz
4
IC3
&¢
XOUT 5
µ
sec/div
0.5V/div
5
µ
sec/div
1V/div
14
B+1.5V
16
: FM
: PB (TAPE)
: REC (TAPE)
L-CH
1
RF
AMP
MIX
7
VCC
OSC
6
5
8
MIX OUT
IC1
FM RF/MIX
Q1,4
BUFFER
IF
AMP
Q7,14
L1
FM RF
D3
D2 D1
L2
FM OSC
FM
FREQUENCY
COVERAGE
Q3
LOCAL/DX
CF1
10.7MHz
3
IF AMP/
FM DET
X1
10.7MHz
7
IC2
IF AMP/MPX
22
AF
CF2
450KHz
6
IF AMP/
AM DET
T2
AM IF
5
4
VCC RF OUT
MIX
OSC
RF OUT
T1
AM OSC
Q10
RF
AMP
L5
AM FERRITE-ROD
ANTENNA
LPF
Q5,6
2
24
21
20
MPX
PILOT
MPX
L
15
R
7
19 LP2B
18 LP2A
11 IF REQ
16 LPF1
Q11
Q9
Q13
Q12
17
RV1
FM VCO
RF OUT
10
IF OUT
Q18(2/2)
BUFFER
Q18(1/2)
BUFFER
MIC
J501
R-CH
REV
R-CH
L-CH
FWD
FWD
REV
Q508
HP901
Q503 Q502
ISS
1
2
3
S501
RF OUT
Q514 Q510
BIAS
OSC
Q501
Q504-507
Q511,512
V
✤
REF
T501
MIC
REG
CONT D
27
43
CONT C 28
42
41
44
3
17
15
14
L
R
23
MIC IN L
21
RADIO IN L
20
MIC IN R
18
RADIO IN R
46
MONITOR L
47
MONITOR L
35
REC MUTE
32
REC/PLAY
33
FWD/REV
Q515
34
MIC/RADIO
IC501
REC AMP
OSC
6
BIAS REG
5
BIAS
7
VCC1
8
REG
Q509
VCC2
45
B+2.5V
B+1.5V
Q513
5
1
4
2
44
12
10
IC301(1/2)
PB AMP
ANS IN
F/R SW
Q304
Q19
+2.5V
VCC 14
4
11
5
10
IC302
DOLBY
CONTROL
Q305 Q303
V REF
Q302
IC3
SYSTEM CONTROL
Q2
BUFFER
DOLBY VCC CTL AVLS CTL
23 54
BAND AM/FM 30
MONO/ST 68
IF IN
64
AM IN 71
RV CTL 56
IMB/GRV CTL 57
AMP CTL 58
FM IN 70
DO
66
LOCAL/DX
65
F/R CTL(PLAY) 29
REC CTL 53
DOLBY CTL 59
F/R CTL(REC) 26
RADIO/MIC 25
M DATA I/O 47
SW 13
MUTE CTL 28
AMS IN 37
BEEP 49
PRE CTL 27
BST CTL 55
R DATA OUT 31
PW SW
42
IC301(2/2)
POWER AMP
PW IN L
28
REF OUT 3
BST OUT 33
PW NF L 29
PW IN C
28
PW IN R
27
PW NF R 26
VOL
RV301
PW OUT L
20
PW OUT R
22
PW OUT C
21
AGC IN 35
MT SW
41
AMS OUT
40
BEEP
39
PRE SW
45
BST SW
43
VCC 19
BIAS 18
RF OUT 17
M/N SW
46
REG
Q1352
RF OUT
IC4
EEPROM
DI 3
DO 4
SK 2
CS 1
M CLOCK 48
CS 46
XOUT 74
XIN 75
X2
75kHz
F TUME
S902
ATS SWITCH
R TUME
B+1.5V
TAPE SWITCH
U
V
W
MOTOR
M601
CAPSTAN/REEL
U 19
W 3
V 1
V REF 7
IN+ 10
CONTROL
IC601
MOTOR
START 8
OSC
5
DR 6
S901
Q601
TAPE SPEED
ADJ
RV601
Q16,17
D4
B+1.5V
PM901
PH1
PR-20
B+2.5V
Q15(1/2)
Q15(2/2)
REV
STOP
FWD
S1
HOLD
S3
ON
OFF
F/R SW 44
PHOTO CTL 38
PHOTO IN 39
HOLD SW 41
REPEAT
RADIO
OFF
FF
S4 S6
MENU
S5 S8 S7
SET
S9 S11
REC S10
S2
HOLD SENS 35
BATT DET 42
KEY IN 43
IC6
REG 3 2
B+2.5V
1
3
4 WAKE UP 67
IC5
CONP.
ND1
LCD
COM1
COM4
1
4
S1
S18
5
22
DC/DC
CONV.
IC801
1
2
5
D801
Q20
OR
Ni-Cd
(NC-6WM)
1.2V
IPC 1.5V
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
Q804,805
DC/DC
CONV.
T801
Q801-803
D804
D803
D802
B+2.5V
B+VD
B+1.5V
DDC2 CTL 61
DDC1 CTL 40
REMO
DATA
VCC
GND
L-CH
COM
R-CH
D201
D301
D101
D302
D303, 304
F1
B+1.5V
REMOTE
J701
• Signal Path
R DATA IN 34
F TUME 32
TAPE 52
R TUME 33
S 1/2 CTL 24
MOTOR CTL 50
OSC CTL 36
MOTOR DIR 51
PM CTL 60
16
REW
PRESET- BAND
RADIO ON/ ENTER/
COUNTER
RESET
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Side A) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side B) the parts face are indicated.