Sony SA-WCT770 Service Manual ▷ View online
SA-WCT770
13
2-12. BOTTOM PANEL BLOCK
Note 1: Please spread a sheet under a unit
not to injure top panel.
total six bosses
3 All bosses are removed while
moving jig in the direction of
the arrow, and bottom panel
block is removed.
3 All bosses are removed while
moving jig in the direction of
the arrow, and bottom panel
block is removed.
1 Insert a flat-head screwdriver in
two slits behind a unit, and lift
the bottom panel block a little.
4 bottom panel block
Note
Note
3:
When installing the bottom panel block,
remove the used bond and use a new
bond to fix the bottom panel block.
2 Insert the jig into a space and raise
bottom panel block.
Note
2:
When using a jig, please work
so as not to injure bottom panel
block.
2 Insert the jig into a space and raise
bottom panel block.
Note
2:
When using a jig, please work
so as not to injure bottom panel
block.
– Rear bottom view –
SA-WCT770
14
2-13. LOUDSPEAKER (16 cm) (SP1)
4 loudspeaker (16 cm)
(SP1)
loudspeaker (16 cm)
(SP1)
(SP1)
1 four screws
(BVTP4
u 14)
1 four screws
(BVTP4
u 14)
2 Remove the loudspeaker
(16 cm) (SP1) in the
direction of the arrow.
3
terminal (red)
(wide
side)
3
terminal (black)
(narrow
side)
Note 1: Please spread a sheet under
a unit not to injure top panel.
– Rear bottom view –
red
(wide side)
(wide side)
black
(narrow side)
(narrow side)
:ire VettiQJ
rear side
front side
terminals position
Note 2: When installing the loudspeaker (16 cm) (SP1),
make sure that there is a position of the speaker
terminal to the position shown in the figure below.
– Bottom view –
SA-WCT770
SA-WCT770
15
15
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-WCT770
SA-WCT770
16
16
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
: Taiwan model
TW
(Except US, CND, TW)
(US, CND, TW)
RF1
RF MODULATOR
(SWA12-4V RX)
DOUT_RX
BCK0_RX
WCK0_RX
MCK_OUT_RX
INT
SCL_STX
SDA_STX
RESETN
Ver. 1.1
Click on the first or last page to see other SA-WCT770 service manuals if exist.