Sony SA-WCT370 Service Manual ▷ View online
SA-WCT370
SA-WCT370
13
13
SECTION 3
TROUBLESHOOTING
1. ON/STANDBY lamp LED fl ashes in red (PROTECT)
Note: When the volume level is “0”, power of amplifi er block is turned off, and amplifi er protect diagnosis is not performed.
Set the volume level than “1”.
2. ON/STANDBY lamp LED does not light up (Power is not turned on)
ON/STANDBY lamp LED flashes
in red.
(PROTECT)
in red.
(PROTECT)
IC104 on the SUB MAIN board is
burned out.
burned out.
ON/STANDBY lamp LED does not
flash in red, when removing the
speaker (SP1) and turning the
power on.
flash in red, when removing the
speaker (SP1) and turning the
power on.
No
Yes
Replace the IC104 on the SUB
MAIN board.
MAIN board.
Yes
Check and replace the speaker
(SP1).
(SP1).
Yes
OUT_D line (pin 28) and OUT_C
line (pin 31) of IC104 on the SUB
MAIN board do not short-circuits
or opens.
line (pin 31) of IC104 on the SUB
MAIN board do not short-circuits
or opens.
No
Replace the IC104 on the SUB
MAIN board.
MAIN board.
Yes
ON/STANDBY lamp LED does not
light up.
(Power is not turned on)
light up.
(Power is not turned on)
The voltage of the following is 4.1 V.
POWER board: CN901 pin 9
POWER board: CN901 pin 9
The voltage of the following is 3.3 V.
SUB MAIN board: IC100 pin 61, 62
SUB MAIN board: IC100 pin 61, 62
Yes
POWER board is damaged.
Yes
Yes
Vibrator (X100) on the SUB MAIN
board is oscillated after AC input.
board is oscillated after AC input.
Yes
Fuse (F900) on the POWER board
conduct the electricity.
conduct the electricity.
No
No
Replace the diode (D111) on the
SUB MAIN board.
SUB MAIN board.
No
Replace the IC100 or vibrator
(X100) on the SUB MAIN board.
(X100) on the SUB MAIN board.
The reset signal is inputted to pin 6
of IC100 on the SUB MAIN board
after AC input.
of IC100 on the SUB MAIN board
after AC input.
Check and repair the area
surrounding IC101 on the SUB
MAIN board.
surrounding IC101 on the SUB
MAIN board.
Yes
Yes
No
Replace the IC100 on the SUB
MAIN board.
MAIN board.
No
Replace the fuse (F900) on the
POWER board.
POWER board.
SA-WCT370
SA-WCT370
14
14
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAM
SYSTEM CONTROLLER
IC100
31 DATA
30 BCK
30 BCK
STREAM PROCESSOR
IC105
11
OUTL1
9
OUTL2
27
DAMP_SCDT
29 LRCK
6 PWM_A
DIGITAL POWER AMP
IC104
8
31
28
PWM_B
36 XFSIIN
X101
49.152MHz
14
XFSOOUT
21 SCDT
6
OUTR1
16 PWM_C
4
OUTR2
18 PWM_D
7 /RESET_AB
17 /RESET_CD
5 /SD
48
XFSOIN
25
DAMP_SHIFT
22 SCSHIFT
31
DAMP_LATCH
23 SCLATCH
29
DAMP_INIT
27 INIT
32
DAMP_SOFT_MUTE
30
DAMP_OVF
19
28
DRIVE_RESET(EN)
45
DRIVE_SD
43
DC_DET
6
SOFTMUTE
25 FLAGL
24 FLAGR
24 FLAGR
PRESCALER
IC103
DC DETECT
Q106
2 S-AIR_DATA
64 S-AIR_CLK
48 S-AIR_GPIO2
50 S-AIR_RESET
48 S-AIR_GPIO2
50 S-AIR_RESET
21 LED_GREEN
22 LED_RED
I
/ 1
S001
D901
(ON/STANDBY LAMP)
49 KEY_POWER
LINK
S002
51 KEY_PAIRING
LED DRIVE
Q109, 111
OUT_C
OUT_D
L001
L002
BUFFER
Q105
POWER DETECT
Q104
SP1
(SUBWOOFER)
AC1
(AC IN)
F900
LINE FILTER
LF001
36
AC_CUT
RESET
13
P_CONT1 (3.3V)
12
P_CONT2
14
P_CONT_PVDD
TH900
RECT
D900
42
PVDD_SD_EN
RECT
D940
RECT
D950
REGULATOR
Q923
ISOLATOR
PC901
RESET SWITCH
Q102
SHUNT
REGULATOR
IC950
ISOLATOR
PC902
ISOLATOR
PC903
SHUNT
REGULATOR
IC940
POWER VOLTAGE
CONTROL
Q961, 962
POWER ON/OFF
CONTROL
Q960
VOLTAGE
DETECT
IC101
T901
SUB POWER
TRANSFORMER
T902
MAIN POWER
TRANSFORMER
D911
D929
D924
D925, 926
D930
D928
TH920
D931
D111
E3.3V
3.3V
1.8V
+3.3V
REGULATOR
IC108
+1.8V
REGULATOR
IC106
4V
B+ SWITCH
Q113, 114
B+ SWITCH
Q110, 112
32V
12V
SHUT DOWN
SWITCH
Q103
OVER LOAD
PROTECT
Q921, 922
Q921, 922
+12V
REGULATOR
IC109
CLOCK
BUFFER
IC107
8 DRAIN
7 DRAIN
2 VCC
4 FB
POWER CONTROL
IC910
1 D
7 OCP/BD
4 VCC
5 OLP/SS
6 FB
POWER CONTROL
IC920
REGULATOR
Q920
B+ SWITCH
Q901
D902
D901
D112
POWER DETECT
Q108
7 Xout
9 Xin
X100
20MHz
: AUDIO (DIGITAL)
SIGNAL PATH
: AUDIO (ANALOG)
Abbreviation
: Canadian model
CND
(Except US, CND)
(US, CND)
RF1
RF MODULATOR
(SWA12-4V RX)
DOUT_RX
BCK0_RX
WCK0_RX
MCK_OUT_RX
INT
SCL_STX
SDA_STX
RESETN
Ver. 1.2
SA-WCT370
SA-WCT370
15
15
For Schematic Diagrams.
Note:
• All capacitors are in μF unless otherwise noted. (p: pF) 50
• All capacitors are in μF unless otherwise noted. (p: pF) 50
WV or less are not indicated except for electrolytics and
tantalums.
tantalums.
• All resistors are in Ω and 1/4 W or less unless otherwise
specifi ed.
• f : Internal component.
• 2 : Nonfl ammable resistor.
• 5 : Fusible resistor.
• C : Panel designation.
• 2 : Nonfl ammable resistor.
• 5 : Fusible resistor.
• C : Panel designation.
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
(In addition to this, the necessary note is printed in each block.)
• A : B+ Line.
• Voltages and waveforms are dc with respect to ground in
• Voltages and waveforms are dc with respect to ground in
wireless connection to the bar speaker (SA-CT370).
no mark : POWER ON
• Voltages are taken with VOM (Input impedance 10 M
• Voltages are taken with VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F :
F :
AUDIO
(ANALOG)
J :
AUDIO
(DIGITAL)
• Abbreviation
CND : Canadian model
CND : Canadian model
For Printed Wiring Boards.
Note:
• X : Parts extracted from the component side.
• Y : Parts extracted from the conductor side.
• f : Internal component.
•
• X : Parts extracted from the component side.
• Y : Parts extracted from the conductor side.
• f : Internal component.
•
: Pattern from the side which enables seeing.
(The other layers’ patterns are not indicated.)
Note:
The components identi-
fi
The components identi-
fi
ed by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specifi ed.
cal for safety.
Replace only with part
number specifi ed.
Note:
Les composants identifi és
par une marque 0 sont
critiques pour la sécurité.
Ne les remplacer que par
une pièce portant le nu-
méro spécifi é.
Les composants identifi és
par une marque 0 sont
critiques pour la sécurité.
Ne les remplacer que par
une pièce portant le nu-
méro spécifi é.
• Abbreviation
CND : Canadian model
CND : Canadian model
• Indication of transistor.
C
B
These are omitted.
E
Q
C E
B
These are omitted.
Caution:
Pattern face side:
(SIDE B)
Parts face side:
(SIDE A)
Pattern face side:
(SIDE B)
Parts face side:
(SIDE A)
Parts on the pattern face side seen
from the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
from the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
• Waveforms
– SUB MAIN Board –
Note: When the complete SUB MAIN board is replaced, re-
fer to “NOTE OF REPLACING THE IC104 ON THE
SUB MAIN BOARD AND THE COMPLETE SUB
MAIN BOARD” on page 4.
SUB MAIN BOARD AND THE COMPLETE SUB
MAIN BOARD” on page 4.
Note: When the complete SUB MAIN board is replaced, re-
fer to “NOTE OF REPLACING THE IC104 ON THE
SUB MAIN BOARD AND THE COMPLETE SUB
MAIN BOARD” on page 4.
SUB MAIN BOARD AND THE COMPLETE SUB
MAIN BOARD” on page 4.
1
IC100
7 (Xout)
1 V/DIV, 20 ns/DIV
50 ns
2 Vp-p
2
IC105
qf (XFSOOUT)
2 V/DIV, 20 ns/DIV
21 ns
4.5 Vp-p
20.8
Ps
3.3 Vp-p
3
IC105
wl (LRCK)
1 V/DIV, 10
Ps/DIV
4
IC105
e; (BCK)
1 V/DIV, 200 ns/DIV
326 ns
3.3 Vp-p
5
IC107
4
1 V/DIV, 20 ns/DIV
20.6 ns
3.2 Vp-p
6
IC103
9 (2Q)
2 V/DIV, 50 ns/DIV
81 ns
4.1 Vp-p
Ver. 1.2
SA-WCT370
SA-WCT370
16
16
4-2. PRINTED WIRING BOARD - SUB MAIN Board (Side A) -
•
: Uses unleaded solder.
Note: When the IC104 on the SUB MAIN board is replaced, refer to “NOTE OF REPLACING THE
IC104 ON THE SUB MAIN BOARD AND THE COMPLETE SUB MAIN BOARD” on page 4.
E
1
3
4
6
6
1
3
3
4
6
E
1
3
4 6
E
1 3
4
6
E
1 3
4
6
E
E
D
G
S
9
1
1
2
24
23
1
4
3
1
1
3
8
1
1
16
17
32
33
48
49
64
3
4
1
2
2
8
14
1
7
44
22
23
1
24
37
13
48
12
25
1
36
3
4
1 2
3
1
4
5
3
4
1
2
2
1
5
R216
R217
R219
R221
R222
R223
R224
R225
R230
R231 R232 R233
R234
R235
R236
C201
C203
C204
C205
R242
C206
R243
C207
C209
R249
C210
C211
CL100
CL101 CL102
CL103
CL104
CL105
CL106
CL107
CL108
CL109
CL110
CL111
CL112
CL113
CL114
CL115
CL116
CL117
CL119
CL120
CL121
CL122
CL125
CL126
CL127
CL128
CL129
CL130
CL131
CL132
CL133
CL134
CL135
CL136
CL137
CL138
CL139
CL140
CL142
CL143
CL145
CL146
Q102
Q103
CL147
Q104
Q105
CL149
Q106
Q108
SL100
Q109
SL101
SL102
CL150
CL151
CL152
CL153
Q110
CL154
Q111
CL155
Q112
CL156
CL157
Q113
CL158
Q114
CL159
CL160
CL161
CL162
CL163
CL164
CL165
CL166
CL168
CL169
SL122
CL170
CL171
CL172
CL173
CL174
CL175
CL176
FB100
FB101
FB102
FB103
FB104
FB105
R103
R104
R105
R108
R109
R110
R111
R112
R113
R114
R115
R117
R118
R119
CN102
R120
R121
CN107
R124
R125
CN109
R126
R127
R128
CN111
CN113
R130
CN114
R131
R135
C101
C102
C103
C104
C105
C106
C107
C108
C109
R148
R149
C110
X100
X101
C112
C113
C114
C115
R152
C116
R153
C118
R154
C119
R155
R156
R158
R159
C120
C122
R160
C125
R161
C126
C127
R164
C129
R165
R167
C130
C131
C132
C133
C134
R171
C135
R172
C136
R173
C137
R174
R175
R176
R177
R178
R179
C140
C141
R180
R181
R182
R183
R184
C148
R185
R186
R187
JL130
R188
JL133
JL134
JL136
C152
R190
JL138
C155
R191
R192
C157
R193
C158
R194
R195
R196
R197
R198
R199
JL141
JL143
C161
JL145
D101
JL146
C162
C165
C166
RB002
C167
RB003
L001
L002
C170
D111
D112
C172
C174
ET100
C175
C177
C178
C179
IC100
IC101
IC103
IC104
C184
C185
IC105
C186
IC106
IC107
C187
C188
IC108
C189
IC109
C191
C194
C195
C196
C197
C198
C199
C05
R200
R202
R203
R205
R206
R208
R209
SUB MAIN BOARD
(SIDE A)
1-889-802-
A
K
SUB KEY
BOARD
CN002
>01P
(NC)
(CHASSIS)
RF1
RF MODULATOR
(SWA12-4V RX)
FFC1
SP1
(SUBWOOFER)
K
A
K
POWER
BOARD
CN901
>03P
SUB LED
BOARD
CN901
>02P
A
B
C
D
E
F
G
1
2
3
4
5
6
7
8
9
10
11
12
11, 12
(11, 12)
(Page 22)
(Page 20)
(Page 22)
Ver. 1.1
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