Sony WX-C770 Service Manual ▷ View online
VT
CONTROL
Q3,4,99
8.5V REG
Q402,411
Q421
POWER
SWITCH
Q401
D1
FM 8V
AM 8V
L-CH OUT
R-CH OUT
AM DET
S-METER
SD
ST
ST
IFC AM
IFC FM
VCO
VT
LO/DX
SEEK
TUNER UNIT
TU1
18
16
12
19
1
5
3
13
20
22
22
11
21
21
6
5
4
13
35
37
38
33
16
CL
18
DI
17
26 25
60 59
27
CE
CL
DI
CE
TONE/
DBB
36
34
TUNER AMP
IC103
OFF
ON
S501
ELECTRONIC VOLUME
IC302
POWER AMP
IC901
CN900
J401
CN307
R-CH
R
MUTE
DRIVE
Q866
SIGNAL
DET
IC404
SUB OUT
AMP
IC403
X1
7.2MHz
X302
32kHz
X301
5MHz
SI
FM ST
SD IN
VSM
SO
PLL
CKO
CE
CE
XT1
XT2
X1
X2
FL
RL
1
3
5
FL+
FL–
1
9
21
20
L
R-CH
L
-6
-5
R
10 MUTE
2
STBY
11
7
9
RL+
RL–
10
2
4
12
3
11
13
14
7
15
5
6
R-CH
L
-4
-3
R
R-CH
L
-2
-1
R
Q412
Q413
Q403
Q414
BUZZER
DRIVE
Q507
POWER
CONTROL
Q8,9
START
MUTE
Q512,513
AM POWER
CONTROL
Q502
POWER
CONTROL
Q865
FM POWER
CONTROL
Q503
MUTE
CONTROL
Q510
R-CH
R-CH
TAPE SECTION
CD SECTION
3
2
1
TAPE L-CH
CD L-CH
S-METER
Q1
16
18
9
7
15
BATT
SUBL +B
SUBR +B
SA +B
AM IF
AM OSC
FM OSC
PD
LO/DX
SEEK
X1
X0
DO
DI
CLK
CE
1
20
72
69
6
5
4
2
PLL
IC1
8
9
9
10
11
73
70
VOL CLK
VOL CE
DATA
EQ CLK
EQ CE
SUB CE
SUB DATA
SUB CLK
MUT
25
26
24
23
24
23
22
51
52
52
53
27
46
28
36
37
35
2
3
4
7
5
6
6
8
9
10
11
31
66
65
64
32
BEEP
AMPON
TU ON
FM ON
PWR ON
TEL MUTE
DIMMER
ACC IN
TEST
SYSTEM CONTROL
IC301(1/2)
IC301(1/2)
3
2
1
7 8 9
DATA
CE
CLK
ELECTRONIC
VOLUME
IC402
1
+
+
TEL MUTE
CONTROL
Q514,599
16
ACC
CHECK
Q504
DIMMER
CONTROL
Q511
BATT
BACK-UP
CHECK
Q508
BATT
PON
04
TAPE
SECTION
MODE 2
MODE 1
STBY
AM 8V
AM 8V
FM 8V
FM 8V
VCC
BU +B
AMP +B
ANT +B
COM 8V
BATT
BU 5V
COM 8V
R-CH
FR+
FR–
RR+
RR–
AMP REM
ANT REM
TEL MUTE
ILL
ACC
TEST
POWER SUPPLY
IC501
BU5V
TU5V
SIG
TAPE
SECTION
J401
7
5
1
2
7
6
12
7
R-CH
EQUALIZER
IC303
BZ300
BUZZER
6
ANT FM
ANT AM
+B FM
+B TU
+B AM
1
2
8
9
10
D904
EQ AMP IC902
2
4
1
3
LINE
AMP
AMP
IC101
BATT
BATT
J1
ANT
BUS AUDIO IN
-2
-1
Signal Path
: FM
: AM
: PB(TAPE)
: CD
POWER
SELECT
SELECT
D511
(FRONT)
(REAR)
LINE OUT
SUB OUT
– 45 –
– 46 –
WX-C770
6-4. BLOCK DIAGRAM — MAIN SECTION —
(Page 43)
(Page 42)
(Page 43)
(Page 44)
– 47 –
DC/DC CONVERTER board
LIMIT SW board
SUB board
SERVO board
CD board
tuner unit
(TUX-006/2 (E))
(TUX-006/2 (E))
MAIN board
REEL SENSOR board
CONTROL board
LOAD SW board
IN SW board
SENSOR board
6-5. CIRCUIT BOARDS LOCATION
WX-C770
– 54 –
WX-C770
• Waveforms
(MODE:PLAY)
1
2
3
4
5
6
7
Approx. 620mVp-p
IC2
1
(FEO)
0V
IC2
#¡
(RFO)
1.2Vp-p
Approx. 200mVp-p
IC2
$™
(TEO)
0V
IC1
3
(MDP)
2.6Vp-p
7.6
µ
sec
IC1
@º
(LRCK)
5.8Vp-p
22.7
µ
sec
IC1
@™
(BCK)
5.7Vp-p
474nsec
16.89MHz
IC1
#¢
(XTAI)
3.2Vp-p
Note:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD PLAY
no mark : CD PLAY
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
J
: CD
– 80 –
• IC Block Diagrams
IC1 CXD2507AQ (SERVO board)
IC3 BA6796FP-T1
XLON
SPOD
SPOC
SPOB
SPOA
CLKO
VDD
CNIN
SEIN
CLOK
XLAT
XLTO
DATO
52
53
54
55
56
57
58
59
60
61
62
63
64
51
SERVO AUTO
SEQUENCER
SEQUENCER
33
34
35
36
37
38
39
40
41
42
43
45
46
47
48
49
50
44
DATA
XRST
SENS
MUTE
SQCK
SQSO
EXCK
SBSO
SCOR
VSS
WFCK
EMPH
DOUT
C4M
FSTT
XTSL
XTAO
XTAO
XTAI
MNTO
20 21 22 23 24 25 26 27
29 30 31 32
28
LRCK
PCMD
BCLK
GTOP
XUGF
XPCK
VDD
GFS
RFCK
C2PO
XROF
MNT3
MNT1
1
2
3
4
5
6
7
8
9
9
10
11
12
16
17
18
19
13
14
15
FOK
MON
MDP
MDP
MDS
LOCK
TEST
FILO
FILI
PCO
VSS
VSS
AVSS
CLTV
AVDD
RF
BIAS
ASYI
ASYO
ASYE
WDCK
5
14
CPU
INTERFACE
SUB CODE
PROCESSOR
DIGITAL
CLV
EFM
DEMODULATOR
DIGITAL
PLL
ASYMMETRY
CORRECTOR
CORRECTOR
5
D/A
INTERFACE
ERROR
CORRECTOR
3
6
3
16K
RAM
DIGITAL
OUT
CLOCK
GENERATOR
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
OPOUT
CH4-IN
CH4
CTL1
CTL2
FWD
REV
TRAY
GND
CH3 -
CH5 -
COM
CH4 +
CH3 +
CH3-IN
CH3
VREF
CH2
CH2-IN
VCC
VCC
CH1 -
CH2 -
CH1-IN
OP IN -
CH1
CH1 +
OP IN +
CH2 +
DRIVE
BUFFER
DRIVE
BUFFER
DRIVE
BUFFER
DRIVE
BUFFER
DRIVE
BUFFER
DRIVE
BUFFER
DRIVE
BUFFER
DRIVE
BUFFER
DRIVE
BUFFER
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
THERMAL
SHUT
DOWN
15
16
17
18
19
20
21
22
23
24
25
26
27
28
LOGIC
CTL1
CTL2
FWD
REV
V/I
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