Sony WX-GT77UI / WX-GT78UI / WX-GT78UIM Service Manual ▷ View online
WX-GT77UI/GT78UI/GT78UIM
WX-GT77UI/GT78UI/GT78UIM
17
17
• A : B+ Line.
• B : B– Line.
• Voltages and waveforms are dc with respect to ground
• B : B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• no mark : FM
( ) : AM
< > : CD PLAY
• Voltages are taken with VOM (Input impedance 10 M
( ) : AM
< > : CD PLAY
• Voltages are taken with VOM (Input impedance 10 M
Ω).
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.
J :
J :
CD
F :
FM
f :
AM
L :
AUX
c :
USB
g :
BUS
AUDIO
For schematic diagrams:
Note:
Note:
• All capacitors are in
μF unless otherwise noted. (p: pF)
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
specifi ed.
• f
: internal component.
• C : panel designation.
For Printed Wiring Boards:
Note:
• X : Parts extracted from the component side.
• Y : parts extracted from the conductor side.
• a :
• X : Parts extracted from the component side.
• Y : parts extracted from the conductor side.
• a :
Through
hole.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
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.
the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
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.)
• Waveforms
– MAIN Board –
• Indication of transistor.
C
B
These are omitted.
E
Q
C
B
These are omitted.
E
Note: The components identifi ed by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specifi ed.
0.04 Vp-p
4 MHz
1.2 Vp-p
32.768 kHz
0.05 V/DIV, 50 nsec/DIV
0.5 V/DIV, 20 μsec/DIV
IC001
RI (XTAL1)
IC501
RE (X_OUT)
1.5 Vp-p
7.92 MHz
0.5 V/DIV, 50 nsec/DIV
IC501
PE (OSC_OUT)
WX-GT77UI/GT78UI/GT78UIM
WX-GT77UI/GT78UI/GT78UIM
18
18
1
A
B
C
D
E
F
G
H
I
2
3
4
5
6
7
8
9
10
11
12
13
14
(CHASSIS)
SUB OUT
(MONO)
SUB BOARD CN2
A
CN401
CN701
(USB IN)
CD
MECHANISM
UNIT
(MG-101Z)
FRONT
AUDIO OUT
1
15
1
1
5
4
6
1
3
7
8
11
10
9
8
1
1
4
6
3
1
3
1
2
20
21
1
37
2
36
1
16
17
32
21
20
40
1
1
7
8
14
1
4
5
8
1
4
5
8
DD
G
S
D
D
D
G
S
DD
D
D
DD
G
S
D
D
D
1
100
30 31
81 80
50
51
C20
J701
C21
C22
R403
C23
R404
C24
C25
R211
R406
C26
R212
R407
C27
R213
R408
C28
R214
R409
R215
R216
R217
R218
R601
R602
R603
R604
CN201
R605
CN202
R606
CN203
R607
R220
R608
R221
R609
R801
R802
R803
R804
R610
R805
R806
R808
R809
R810
R811
R812
R813
R814
R815
R816
R818
C201
R819
C202
C203
C204
C205
C206
C207
C208
R820
R821
C209
R822
C401
R825
C402
R826
R827
JL001
C405
JL002
C406
JL003
C407
JL004
C408
JL005
C409
JL006
JL007
JL008
C601
JL009
C602
C603
C410
TH601
C411
C412
C413
JL010
C414
JL011
C415
JL012
C416
JL013
C417
JL014
C418
C801
C802
C803
C804
JL018
C805
C806
C807
C808
C809
C810
C811
C813
JL027
C814
C815
JL029
C817
C819
JL030
JL031
JL032
JL033
C820
JL034
JL035
C822
JL036
JL037
C823
JL038
C98
C824
C1
JL039
C99
C5
C6
C7
C8
JL040
C9
JL041
JL042
JL043
JL044
JW200
JL045
JL046
JL047
JL048
JL049
JL050
D201
JL051
US MODEL
EXCEPT
US
MODEL
JL052
D202
JL053
D203
JL054
D204
JL055
D205
JL056
JL057
JL058
JL059
Q501
Q502
Q503
IC001
D601
D603
D604
Q701
D605
Q702
D606
Q703
D607
D801
L501
D802
D803
D804
Q901
Q902
Q903
Q904
IC401
Q905
Q906
Q907
L701
L702
L703
L704
IC601
L901
JW10
IFM1
JW1
1
IFM2
JW12
IFM3
JW13
IFM4
JW14
IC801
IFM5
JW15
IC802
IFM6
JW16
IC803
IFM7
JW17
IFM8
JW18
JW19
JW20
JW22
JW23
JW24
JW25
JW26
JW27
JW28
JW30
R109
JW31
JW32
JW33
JW34
R301
J601
JW35
R302
JW36
R303
JW37
R110
R304
JW38
R
111
R305
JW39
R112
R306
R307
JW40
JW41
R502
JW42
R503
JW43
JW44
R505
JW45
JW46
R507
JW47
JW48
R509
L1
JW49
L2
R701
L6
R702
R703
L7
L8
R704
JW50
R705
JW51
R512
R706
JW52
R513
R707
JW53
R514
R708
JW54
R515
R709
JW55
R516
JW56
R517
JW57
R518
JW58
R519
JW59
R903
R710
R904
R71
1
CN501
R905
R906
R907
R520
R908
R521
R909
JW61
R522
JW62
R523
JW63
R524
JW64
R525
JW65
R526
JW66
R527
JW67
R528
R910
JW68
CN701
R529
R91
1
JW69
R913
R914
R915
R916
R917
R530
R918
JW70
C301
R919
R531
JR1
C302
R532
JR2
JW72
C303
R533
JR3
JW73
C304
R534
JR4
JW74
C305
CN901
R535
JR5
JW75
C306
CN902
R536
JR6
JW76
C307
R537
JR7
JW77
C308
R920
R538
JR8
JW78
C309
R921
R539
JR9
JW79
R922
R923
C503
C504
C310
R540
JW80
C311
C505
R541
JW81
C312
C506
JW82
C313
C507
R543
JW83
R10
C314
C508
R544
JW84
R11
C509
R545
JW85
R12
C316
JW86
R13
C317
R547
JW87
R14
C318
JW88
C701
R15
C319
JW89
C702
R16
C703
C704
C510
X501
C705
C511
X502
C706
C512
C707
C513
C708
C320
C514
R550
JW90
C321
R551
JW91
C322
R552
JW92
C323
R553
JW93
C324
R554
JW94
C901
C325
C902
R556
JW96
C903
R557
JW97
C904
C328
R558
JW98
C905
A001
C329
1
3
R559
JW99
C906
A002
C907
C908
C909
C330
C332
R562
C333
R563
C910
R564
C334
C911
R565
C912
R566
C913
R567
R568
R1
R2
R3
C917
C918
R4
R5
R5
C919
R6
R570
F801
C921
C922
C923
JW100
VR1
JW101
JW102
JW103
JW104
JW105
JW106
JW107
JW108
JW1
JW109
JW2
JW3
JW4
JW5
JW6
JW7
JW1
10
JW8
Q201
JW
111
JW9
JW1
12
JW1
13
JW114
JW115
JW1
16
JW1
17
JW118
JW1
19
D305
D306
D307
D308
JW120
D309
JW121
JW122
JW123
JW124
L201
JW125
L202
D502
JW126
L203
D503
JW127
D310
JW128
D505
D311
Q601
JW129
D312
L206
JW130
D701
L401
JW131
D702
L402
JW132
D703
D704
JR10
JW134
Q801
D705
JR11
JW135
Q802
D706
JR12
JW136
Q803
JW137
D707
JR13
Q804
JW138
D708
JR14
IC301
Q805
JR15
JW139
IC302
Q806
JR16
IC303
JR17
JR18
D901
JW140
W1
JW141
W2
JW142
JR20
JW144
IC501
JR21
JW146
JW147
JR23
JW148
JR24
L801
JR25
JW149
L802
JR26
L803
JR27
JR28
JR29
D913
D914
JW150
D915
X1
JW151
JW152
JW153
JR30
JW154
JR31
JR32
JR33
JR34
JR35
JR36
JR37
JR38
JR39
JR40
JR41
JR42
JR43
JR44
JR45
JR46
JR47
JR48
JR49
C12
C13
R201
R202
C16
R203
C17
R204
C18
JR50
R205
C19
JR51
R207
14
28
R208
R209
1-879-271-
(11)
11
MAIN BOARD
J1
(ANTENNA)
-1
L
R
-3
-4
J901
-2
-5
-6
L
R
L
L
R
R
BUS IN
REAR
1
9
8
16
1
1
2
4
3
4 5
8
(BUS CONTROL IN)
(REMOTO IN)
FU601
3
X501
4-3. PRINTED WIRING BOARD – MAIN Section –
•
: Uses unleaded solder.
Ref. No. Location
• Semiconductor Location
Ref. No. Location
D201
F-8
D202
D-7
D203
G-9
D204
H-9
D205
G-9
D305
B-6
D306
C-6
D307
B-6
D308
C-7
D309
C-8
D310
C-8
D311
C-8
D312
C-8
D502
H-5
D503
I-8
D505
F-4
D601
B-9
D603
B-9
D604
B-9
D605
C-9
D606
G-9
D607
G-9
D701
C-9
D702
C-8
D703
D-8
D704
C-8
D705
D-8
D706
C-8
D707
D-8
D708
B-9
D801
F-10
D802
F-10
D803
H-10
D804
F-9
D901
D-8
D915
H-3
IC001
E-2
IC301
B-5
IC302
E-6
IC303
F-7
IC401
D-4
IC501
F-6
IC601
G-8
IC801
E-9
IC802
H-8
IC803
F-9
Q201
D-6
Q501
G-10
Q502
G-7
Q503
H-7
Q601
G-9
Q701
D-8
Q702
D-8
Q703
C-8
Q801
E-10
Q802
E-10
Q803
F-9
Q804
H-9
Q805
H-10
Q806
H-9
Q901
B-4
Q902
B-4
Q903
B-3
Q904
B-4
Q905
D-3
Q906
D-8
Q907
D-8
(Page 22)
WX-GT77UI/GT78UI/GT78UIM
WX-GT77UI/GT78UI/GT78UIM
19
19
8
4
F
10
A
15
E
3
D
11
C
9
G
7
H
1
5
2
J
6
B
I
14
13
12
BOARD
(2/3)
MAIN
1
2
MAIN BOARD (3/3)
IC B/D
IC B/D
3.1
7.2
3.1
7.2
14.4
7.2
7.2
8.3
7.7
7.7
7.7
7.7
8.2
7.2
7.2
14.4
7.2
3.3
7.2
3
13.7
13.7
8.3
0 <3.3>
6.1
10.5
14.4
14
5.1
3.3
5.1
3.2
3.3
0
0
13.6
13.9
0.6
3
0.6
0
0
0
14.4
0
5.3
1.5
1.6
2.7
3.2
0
3.3
5.1
2.5
0.1
5.3
0
5.1
25V
22
C303
0
R302
0
R301
10V
C325
1000
0.22
C301
0.22
C302
0.22
C313
0.22
C312
0.22
C322
0.22
C323
0.22
C702
0.22
C703
250uH
L701
1
C305
1
C304
1
C307
1
C306
1
C309
1
C308
1
C31
1
1
C310
0.01
C316
0.01
C318
0.01
C320
0.01
C324
0.01
C330
16V
10
C319
16V
10
C321
16V
10
C317
0
R306
6.3V
330
C328
43
12
XC61CN2802NR
IC303
VOUT
VIN
NC
VSS
100k
R307
100k
R707
1k
R702
4.7k
R703
MAZ8180GMLS0
D705
MAZ8180GMLS0
D706
MAZ8180GMLS0
D704
MAZ8180GMLS0
D702
MAZ8180GMLS0
D703
4.7k
R701
1000p
C704
1000p
C705
16V
3300
C701
1N5404-C311-3
D701
1SS355WTE-17
D707
1SS355WTE-17
D901
10k
R705
10k
R706
2SC3052EF-T1-LEF
Q701
TEL-ATT DETECT
2SC3052EF-T1-LEF
Q702
ILL DETECT
2SC3052EF-T1-LEF
Q703
ACC DETECT
22k
R708
47k
R704
47k
R709
47k
R710
0.47
C707
0.47
C708
4.7k
R711
RT1N141C-TP-1
Q907
J701
(REMOTE IN)
L702
L703
L704
RT1P141C-TP-1
Q906
16V
47
C913
25V
470
C602
TH601
0
R605
0.1
C601
MAZ8180GMLS0
D601
MAZ8180GMLS0
D605
14
13
12
11
10
9
8
7
6
5
4
3
2
1
BA8271F-E2
IC601
BUS_ON
RST
BATT
CLK
VREF
DATA_I/O
GND DATA_OUT
DATA_IN
BU_CHECK
CLK_IN
BUS_IN
RST
VCC
100
R602
100
R606
100
R601
R
T1N141C-TP-1
Q601
MAZ8180GMLS0
D607
1k
R608
15k
R607
1k
R604
1k
R603
MAZ8180GMLS0
D603
0.01
C603
330k
R609
150
R303
47p
C332
0
R304
47k
R305
330k
R610
2.2
C333
TDA8588AJ/N2/R1
IC301
1
TA
B
2
I2C_SIO
3
OUT
-FL-
4
I2C_SCK
5
OUT
-FL+
6
VP2
7
OUT
-RL-
8
P-GND1
9
OUT
-RL+
10
SVR
11
IN-RL
12
IN-FL
13
S-GND
14
IN-FR
15
IN-RR
16
BEEP
17
OUT
-RR+
18
P-GND3
19
OUT
-RR-
20
VP1
21
OUT
-FR+
22
STB
23
OUT
-FR-
24
P-GND4
25
DIAG
26
RST
27
ANT
-REM
28
CRES
29
AMP-REM
30
AUDIO+B (8.5V)
31
SER
VO-3.3V
32
GND
33
MECHA-6V
34
PA
N
EL
+B
35
VP
36
CBU
37
BU+B
G
G
G
J601
(BUS CONTROL IN)
8P
7
8
4
5
6
5
6
1
2
3
2
3
I
VSS
O
XC6218P332PR
IC302
D309
1A4-A2
D307
1A4-A2
D310
1A4-A2
D308
1A4-A2
D311
1A4-A2
D306
1A4-A2
D312
1A4-A2
D305
1A4-A2
1
C314
W1
W2
MAZ8062GMLS0
D606
50V
4.7
C706
CN701
16P
1
FL+
2
RL+
3
RR+
4
FR+
5
AMP-REM
6
ANT-REM
7
ACC
8
GND
9
FL-
10
RL-
11
RR-
12
FR-
16
+B
13
TEL-ATT
14
ILL
15
TEST
17
+B
18
+B
19
+B
47
R913
0.1
C329
MAZ8068GMLS0
D708
MA2ZD140GLS0
D604
0.01
C334
IN-FR
IN-FL
IN-FL
HOT_GND
IN-RR
IN-RL
IN-RL
MUTE
8.5V
3.3V
A-GND
PANEL+B
RESET
STB
DIAG
AT
T
MECHA+6V
8.5V
+B
A-GND
SER
VO+3.3V
I2C_SCK_C,I2C_SIO_C
BUS_ON,SYS_RST
,BU_CHECK,
ACC_IN,BEEP_C,ILL_IN,
I2C_SCK_C,I2C_SIO_C
I2C_SIO_C
I2C_SCK_C
BEEP_C
TEL_ATT
ILL_IN
ACC_IN
RC_IN0
RC_IN1
RC_IN1
UNISI
UNISO
BU_CHECK
UNISCK
BUS_ON
SYS_RST
BUS INTERFACE
IC601
I2C BUS CONTROLLED
IC301
MAIN BOARD (1/3)
+3.3V REG
IC302
RESET
IC303
2
3
1
FU601
10A
Q601
BATTERY
CHECK
POWER AMP/MULTIPLE
VOLTAGE REGULATOR
MUTE DRIVE
Q906,907
RC_IN0,RC_IN1,TEL_A
TT
UNISCK,UNISI,UNISO
13
REAR
AMP REM
2
12
ILL
ACC
+
7
6
4
16
14
10
BATT
L-CH
+
15
-
R-CH
1
FRONT
3
-
-
5
L-CH
9
-
+
11
+
GND
R-CH
REAR
ATT
FRONT
8
ANT REM
4-4. SCHEMATIC DIAGRAM – MAIN Section (1/3) –
• See page 27 for IC Block Diagrams.
(Page 21)
(Page 20)
WX-GT77UI/GT78UI/GT78UIM
WX-GT77UI/GT78UI/GT78UIM
20
20
A
B
11
D
G
2
12
9
13
6
F
I
3
4
14
H
7
E
C
8
J
10
1
5
1
CN2
BOARD
SUB
A
BOARD
(1/3)
1
MAIN
3
MAIN BOARD (3/3)
IC B/D
IC B/D
8.3
(6.5)
8.3
(6.5)
8.3
1.2
0
0
2.6
(6.5)
(2.9)
(1.2)
(4)
(1.2)
2.2
5.6
8.3
6.9
3.4
3.1
3.1
6
6
(5)
(3.6)
(2)
3.8
3.8
(1.8)
8.3
(4.2)
(1.4)
(2.9)
(2.9)
0
0
3.1
3.1
0
0.4
3
3.9
(1.1)
0.8
4.1
4.1
4.1
4.1
3.7
3.7
3.5
3.4
3.8
3.8
3.8
3.8
3.8
3.8
4.1
4.1
4.1
4.1
0
0
0
4.1
4.1
4.1
4.1
4.1
8.3
3.1
3.1
3.7
0
0
0
0
0
0
0
0
0
0
1
*
2
(US)
*
(EXCEPT US)
(US)
(EXCEPT US)
2
*
2
*
*
1
*
2
0.1
C416
1
C922
1
C921
0
R109
0
R110
0
R111
1000p
C919
R112
10k
L901
470
R914
470
R915
3.3k
R406
3.3k
R408
4700p
C410
4700p
C413
4700p
C918
4700p
C917
0.033
C411
0.033
C412
50V
10
C414
50V
10
C909
50V
10
C910
50V
10
C911
100p
C902
100p
C903
100p
C904
100p
C905
100p
C901
100p
C906
1k
R903
1k
R904
10k
R905
10k
R906
220
R909
220
R911
1
C401
1
C402
1
2
3
4
5
5P
CN203
USB_SHIELD
GND(USB)
D-(USB)
D+(USB)
VBUS(USB)
GND(USB)
D-(USB)
D+(USB)
VBUS(USB)
ABSORBER, CHIP
SURGE
D914
ABSORBER, CHIP
SURGE
D913
12k
R917
12k
R916
220
R908
50V
10
C907
220
R907
50V
10
C908
1
C407
47p
C408
LTC614TKFP8T146
Q901
LTC614TKFP8T146
Q902
LTC614TKFP8T146
Q903
LTC614TKFP8T146
Q904
LTC614TKFP8T146
Q905
3.3k
R407
3.3k
R409
R218
0
MAZ8068GMLS0
D203
C912
4700p
1
C405
1
C406
MAZ8068GMLS0
D205
MAZ8068GMLS0
D204
CAM001
JL035
JL045
JL036
JL046
JL037
JL038
JL029
JL039
JL030
JL040
JL031
JL041
JL032
JL042
JL033
JL043
JL034
JL044
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
CN902
18P
DOOR-IND
DOOR-SW
+B(LCD-LED)
SIRCS
KEY0
LCD_DATA
RE1
RE0
LCD-CLK
LCD-CE
KEY1
GND(KEY)
AUX-L
AUX-GND
AUX-R
GND(LCD-LED)
GND(LCD-LED)
RESET
1
2
3
3P
CN901
SUB_OUT
GND
SUB_OUT
50V
2.2
C417
50V
2.2
C418
1
2
3
3P
CN202
D+(USB)
D-(USB)
GND(USB)
D-(USB)
GND(USB)
L401
L402
2.2k
R918
50V
2.2
C923
220
R910
JW200
D915
UDZSUSTE-176.8B
10k
R922
10k
R919
10k
R921
10k
R923
10k
R920
47k
R404
0.1
C409
1
2
3
4
L206
R221
22
R220
22
100p
C99
10V
220
C415
1.5k
R403
L1
G G
R1
L2
R2
R3
L3
J901
40
39
38
37
36
35
34
7
6
5
4
3
2
1
33
32
30
31
8
27
28
29
9
10
11
12
13
14
24
17
25
26
23
22
21
20
19
18
15
16
BD3447AFV-E2
IC401
BUS_LCH
BUS_RCH
TU_LCH
TU_RCH
CD_LCH
CD_RCH
AUX_LCH
AUX_GND
AUX_RCH
NCO
NCO
NCO
ZAP_BEEP
NCO
NCO
ZAP_BEEP
EBIAS
DS2_L
DS1_L
DS3_L
DS3_R
DS1_R
DS2_R
EBIAS
NCO
NCO
SA_CLK
SA_DA
SA_OUT
OUT_SRCH
OUT_SLCH
OUT_RRCH
OUT_RLCH
OUT_FRCH
OUT_FLCH
VCC(8.5V)
I2C_SCK
I2C_SIO
GND
FIL
JW113
C98
1000p
JW147
100
R13
C6
3.3uH
L1
VR1
JW148
0.01
C23
32
31
30
29
28
27
123456
26
25
24
789
23
22
21
20
10
11
12
19
18
17
13
14
15
16
IC001
AMRFIN
AMRFDEC
FMIN2
FMIN1
GNDRF
VCC2
AMRFAGC
LOUT
ROUT
GNDAUD
AMIFAGC2
MPXIN
MPXOUT
RSSI
XTAL2
XTAL1 GNDD
SCL
SDA
VREF
VREGSUP
VCC1
GND
VCODEC
PLL
PLLREF
TEST
AMSELIN1
AMSELIN2
AMIFAGC1
AMSELOUT1
AMSELOUT2
JW126
16V
47
C28
22
R12
0.01
C19
1
C21
JW137
JW102
0.1
C9
0.1
C27
R15
0.01
C8
0
R4
1000p
C1
4.7k
R11
0.01
C20
470k
R1
0.1
C24
0.1
C26
J1
0.01
C22
4MHz
X1
0.1
C17
33k
R10
100
R14
L6
1
2
3
4
6
0.1
C25
R3
1000p
C5
470k
R2
68k
R6
CAM002
2.2
C13
12p
C18
0.22
C12
6p
C7
0
R5
560uH
L8
560uH
L7
L2 2.2uH
R16
0.47
C16
JW138
A001
(CHASSIS)
PANEL+B
A-GND
3.3V
MUTE
8.5V
IN-RL
IN-RR
HOT_GND
IN-FL
IN-FR
HOT_GND
CD-RCH
CD-LCH
RESET
VBUS
3.3V
A-GND
A-GND
SA_CLK,SA_DA,SA_OUT
,
DA
VN,RDS_ON,VSM
I2C_SCK_C,I2C_SIO_C
DOOR_SW
,KEY_IN0,KEY_IN1,
LCD_CE,LCD_SCK,LCD_SO,
RE_IN0,RE_IN1,SIRCS
I2C_SIO_C
I2C_SCK_C
SA_OUT
SA_DA
SA_CLK
ZAPPIN_BEEP
DOOR_SW
SIRCS
LCD_SO
RE_IN1
RE_IN0
LCD_SCK
LCD_CE
VSM
I2C_SIO_C
I2C_SCK_C
KEY_IN1
KEY_IN0
DAVN
IC401
ELECTRONIC VOLUME
PHASE LOCKED LOOP(PLL)
IC001
MAIN BOARD (2/3)
FM MIX
(ANTENNA)
L
R
-1
-2
-4
-3
-6
-5
REAR
FRONT
AUDIO OUT
AUDIO IN
BUS
(CHASSIS)
SUB OUT
(MONO)
( )
Q901-905
MUTE
ZAPPIN_BEEP
TEF6607T/V4/S470,518
ABSORBER,CHIP SURGE
L
R
R
L
6P
(CHASSIS)
(USB)
(MG-101Z)
(1/2)
CD MECHANISM
UNIT
9p
C6
R3,15,16
10p
0
FERITE
FERITE
4-5. SCHEMATIC DIAGRAM – MAIN Section (2/3) –
• See page 17 for Waveforms. • See page 28 for IC Block Diagrams.
(Page 23)
(Page 21)
(Page 19)
Click on the first or last page to see other WX-GT77UI / WX-GT78UI / WX-GT78UIM service manuals if exist.