Sony HCD-EC55 / HCD-EC77 / HCD-GX99 / MHC-EC55 / MHC-EC77 / MHC-GX99 Service Manual ▷ View online
37
37
HCD-EC55/EC77/GX99
HCD-EC55/EC77/GX99
7-8. SCHEMATIC DIAGRAM — MAIN SECTION (2/2) —
3.9
3.9
17
2.2
2.8
1.3
0.7
5.3
5.3
0
0
0
5.6
1.9
17
9
5.6
0.7
3.3
6.2
3.9
0
3.9
0
0
0
0
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
7.8
3.9
3.9
3.9
No mark : CD PLAY
No mark : CD PLAY
1
2
3
4
5
6
7
8
8P
CN604
RELAY ON/OFF
V STBY
AC DETECT
VH(AC)
VL(AC)
GND
VL(AC)
VH(AC)
TB602
100V
C621
0.1
100V
C623
0.1
1N5402-F46
D607
1N5402-F46
D608
1N5402-F46
D610
1N5402-F46
D609
1N4002B
D612
1N4002B
D611
C626
C622
25V
2200
C627
25V
1000
C628
MC2838-T112-1
D602
MC2836
D606
2SC3052F-T1-LF
Q606
2SC3052F-T1-LF
Q605
2SC3052F-T1-LF
Q604
R646
100
R652
100
R614
10k
R613
10k
R648
47k
R649
2.2k
1uH
L603
1uH
L604
10
R615
10
R612
10
R611
10
R647
0.1
C607
0.1
C617
0.1
C608
0.1
C618
47
R642
47
R641
47
R638
D605
MC2838-T112-1
D601
4.7k
R610
4.7k
R609
1N4002B
D615
2SC3052F-T1-LF
Q619
0.022
C642
2.2k
R693
56k
R686
10k
100k
R729
2SA1235TP-1EF
Q618
10k
R677
10k
R676
D616
28
27
26
25
24
23
22
7
6
5
4
3
2
1
21
20
16
17
18
19
13
12
11
10
8
9
15
14
R2S15904SP
IC602
TUNER-R
AUDIO-R
TAPE-R
TAPE-L
AUDIO-L
TUNER-L
CD-L
OUT
-L
VOL-L
OUT
-R
VOL-R
BASS-R
BASS-R
BASS-L
BASS-L
NC
NC
TRE-L
TRE-R
D-GND
CLK
D
ATA
REF
VCC
A-GND
R-OUT
L-OUT
CD-R
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
21P
CN608
AVDD
R-OUT
DAC-GND
L-OUT
A-GND
RST
BUS0
BUS1
BUS2
BUS3
BUCK
CCE
REQ
SBSY
D-GND
D-OUT
DVDD
VM7V
M-GND
M-MUTE
ZDET
1N4002B
D619
1N4002B
D620
16V
100
C631
KTC3203Y-AT
Q624
10V
220
C669
100
R722
1k
R716
2SC3052F-T1-LF
Q622
22k
R720
10V
470
C673
16V
100
C667
100
R715
50V
1
1
C663
50V
1
1
C664
220
R707
R732
R732
R731
R731,
220
R706
220p
C660
220p
C659
50V
10
C661
8.2k
R681
8.2k
R684
0.1
C662
50V
1
C676
50V
1
C675
1
C658
1
C656
C654
1
C652
1
1
C650
1
C648
C651
100p
C645
220p
1k
R697
C653
100p
C666
220p
1k
R709
C635
1
C643
1
2SC3052F-T1-LF
Q617
2SC3052F-T1-LF
Q616
4.7k
R679
4.7k
R680
2SC3052F-T1-LF
Q608
D614
R667
47k
10V
47
C630
1k
R666
D604
MA111-TX
MA111-TX
MA111-TX
MA111-TX
10V
100
C620
C609
C610
10k
R691
R692
4700p
C639
4700p
C640
10k
R682
10k
R694
2.7k
R683
2.7k
R695
1
2
3
4
5
6
7
8
9
CN605
9P
AUDIO-L
A-GND
AUDIO-R
HP-GND
HP-L
HP-R
AMP-ON
SP-RELAY
GND
50V
1
C644
50V
1
C636
50V
1
C646
50V
1
C665
TP615
TP616
TP617
TP618
TP619
TP620
TP621
TP622
TP623
TP624
TP625
TP626
TP627
TP628
TP629
TP630
TP631
TP632
TP633
TP634
TP635
TP636
TP637
TP638
TP639
TP640
TP641
TP642
TP643
TP644
TP645
TP646
TP647
TP648
TP649
TP650
TP651
TP652
TP653
TP654
TP655
4.7k
R700
4.7k
R704
R622
33k
R617 10k
R623
10k
R624 10k
R618 10k
R625
33k
R616
R616,
R619
R619
D618
1
2
3
4
5
6
7
8
9
10
CN603
10P
OUT-L
-VH
+VH
OUT-R
PA-GND
PROTECT
AMP-ON
IN-L
A-GND
IN-R
63V
C677
3300
63V
C678
3300
10k
R696
10k
R708
C649
220p
C655
220p
68
R717
68
R718
68
R719
0.068
C634
0.068
C633
0.068
C638
0.068
C637
10V
C671
100
C641
C641
R645
4.7k
R643
50V
4.7
C632
2.2k
R690
27k
R689
33k
R710
33k
R711
820
R712
0.1
C691
0.1
C693
0.1
C694
470p
C689
47k
R685
220k
R687
C850
0.1
R701
0
R702
0
1k
R644
1PS226-115
D623
C684
C684
C685
C686
C686
C685
C687
1000p
C688
1000p
2200p
C680
2200p
C682
R620
4.7k
R621
4.7k
C611
0.22
C612
0.22
100k
R639
100k
R640
MC2838-T112-1
D617
0uH
FB601
Relay
RY602
R650
4.7k
R651
4.7k
R727
4.7k
R728
4.7k
47k
R678
R688
1
C695
1
C696
C702 0.01
C701 0.01
C704 0.01
C703 0.01
0.1
C668
100p
C670
W612
W611
C698
C699
C700
1000p
1/2W
100
R658
1/2W
100
R660
1/2W
100
R661
1/2W
100
R662
1/2W
100
R663
1/2W
100
R664
1/2W
100
R668
1/2W
100
R671
47
R674
47
R675
3P
W609
1
IN
2
GND
3
OUT
3P
W610
1
1
IN
2
2
GND
3
3
OUT
PROTECT
A-GND
AMP-R
A-GND
AMP-L
AMP-STBY
FAN
I-P-
MONI
CD-A
VR
AUDIO-L
AUDIO-R
HP-L
HP-R
O-CD-SBSY
O-CD-CCE
I/O-BUS3
I/O-BUS1
O-CD-RST
O-CD-REQ
AMP-ON
HP-R
O-FUNC-CLK
O-FUNC-DA
TA
AMP-R
AMP-L
HP-L
OUT-R
CD-L
TUNER-R
TUNER-L
OUT-L
REC-R
AUDIO-L
AUDIO-R
CD-R
CD-L
O-CD-ON
O-POWER
TP-REC-MUTE
CD-A
VR
OUT-L
OUT-R
O-CD-BUCK
I/O-BUS2
O-CD-M-MUTE
I-CD-ZDET
I/O-BUS0
PB-L
PB-R
SP-RELAY
PROTECT
CD-R
PROTECT
SW-OUT
AMP-STBY
REC-L
A-GND
O-POWER
SP RELAY
DRIVER
DRIVER
Q605,Q606
AC MONITOR
AC MONITOR
CD MONITOR
POWER RELAY
DRIVE
AMP CONTROLLER
AUDIO SELECTOR
TONE CONTROLLER
CD POWER
SWITCH
SWITCH
+3.3V REG
REC MUTE-L
REC MUTE-R
1 2 3 4
5
6
7
8
9 10
11
12 13
14
15
16 17 18
IC B/D
LOW-AMP BOARD
CN101
(Page 44)
SPEAKER
LOW FREQ.
IMPEDANCE :
USE 8
PT (U) BOARD
PT BOARD
CN051
CN051
(Page 47)
(Page 46)
MAIN BOARD
(2/2)
BD90 BOARD
CN201
(Page 34)
JACK BOARD
FFC404
(Page 45)
A
J
Ω
D
L
K
E
3.9K : EC55
10K : EC77: E51,E2,E3,MX,AR,AUS
15K : EC77 : US,CND/GX99
8.2K : EC77 : AEP,RU
10K : EC77: E51,E2,E3,MX,AR,AUS
15K : EC77 : US,CND/GX99
8.2K : EC77 : AEP,RU
IC601
REG BOARD
+9V REG
TA7809S
C629
0.1 25V
EC77/GX99
EC77/GX99
EC77/GX99
EC77/GX99
10p : EC55:EXCEPT AEP,UK,RU
EXCEPT
AEP,UK,RU
AEP,UK,RU
22p : EC77:EXCEPT AEP,RU/GX99
EXCEPT US,CND
EXCEPT US,CND
US,CND
EC77/GX99
HI-AMP BOARD
CN101
(Page 42)
EC55
1
MAIN BOARD (1/2)
(Page 36)
2
MAIN BOARD (1/2)
(Page 36)
SPEAKER
IMPEDANCE :
USE 6
Ω
EC55
EC77/GX99
EC55 : US,CND
EC55 : US,CND
EXCEPT
L
R
-
+
+
-
*
*
*
*
*
*
*
R692
4.7k:EXCEPT US,CND,AEP,UK,RU
4.7k:EXCEPT US,CND,AEP,UK,RU
10k:US,CND,AEP,UK,RU
*
*
*
*
*
*
*
*
*
(CHASSIS)
(CHASSIS)
1000P
1000P
AEP,UK,RU
GX99
No Mount AEP,UK,RU
10p : EC55:EXCEPT AEP,UK,RU
22p : EC77:EXCEPT AEP,RU/GX99
22p : EC77:EXCEPT AEP,RU/GX99
No Mount AEP,UK,RU
10p : EC55:EXCEPT AEP,UK,RU
22p : EC77:EXCEPT AEP,RU/GX99
22p : EC77:EXCEPT AEP,RU/GX99
470p : AEP,UK,RU
0.01
0.01
0 EXCEPT AEP,UK,RU
100 AEP,UK,RU
2.2/50V EXCEPT AEP,UK,RU
3.3/50V AEP,UK,RU
3.3/50V AEP,UK,RU
EXCEPT AEP,UK,RU
*
R645
2.2k:EC77,MX
4.7k:EC55/EC77:
EXCEPT MX/GX99
2.2k:EC77,MX
4.7k:EC55/EC77:
EXCEPT MX/GX99
*
EC55:EXCEPT
AEP,UK,RU
AEP,UK,RU
2200uF/50V : EC55
3300uF/63V : EC77: US,CND,AEP,RU/GX99
Not Used : EC77: EXCEPT US,CND,AEP,RU
3300uF/63V : EC77: US,CND,AEP,RU/GX99
Not Used : EC77: EXCEPT US,CND,AEP,RU
EC77: EXCEPT US,CND,AEP,RU
*
*
*
C622,C626
MAZ8039GHLS0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
A
B
C
D
E
F
G
H
I
J
•
See page 48 for IC Block Diagram.
Ver. 1.2
38
38
HCD-EC55/EC77/GX99
HCD-EC55/EC77/GX99
7-9. PRINTED WIRING BOARD — PANEL BOARD —
•
See page 29 for Circuit Boards Location.
:Uses unleaded solder.
IC302
IC301
1
3
1
2
C342
C341
C340
C332
C330
C321
C320
C319
C317
C313
C312
C311
C310
C308
C304
C301
JR319
JR313
JR311
JR310
JR306
JR301
JR321
JR320
JR318
JR317
JR316
JR315
JR314
JR312
JR309
JR308
JR307
JR305
JR304
JR303
JR302
R399
R397
R396
R393
R392
R390
R389
R388
R387
R386
R385
R384
R383
R382
R381
R380
R379
R378
R377
R376
R375
R374
R373
R372
R371
R370
R369
R368
R367
R366
R365
R364
R363
R362
R361
R360
R359
R358
R357
R356
R355
R354
R353
R352
R351
R350
R349
R348
R347
R346
R345
R344
R343
R342
R341
R421
R340
R339
R338
R337
R336
R335
R334
R333
R332
R331
R330
R329
R328
R326
R325
R324
R323
R322
R321
R320
R319
R318
R317
R316
R315
R314
R313
R312
R311
R310
R309
R308
R307
R306
R305
R304
R303
R302
R301
R420
R419
R413
R412
R406
R405
R402
R401
R400
Q318
Q303
Q312
Q308
Q307
Q313
Q304
Q310
Q317
Q305
Q315
Q314
Q306
Q316
Q301
Q311
D303
D302
D305
D304
D301
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
x
TUNING –
l m
l m
TUNING +
M L
FUNCTION
TUNER/BAND
VOLUME
CD u
1-872-055-
12
(12)
R327
S301
JW353
JW335
JW390
JW348
JW342
JW369
JW368
JW367
JW366
JW365
JW364
JW363
JW362
JW361
JW360
JW359
JW358
JW357
JW356
JW355
JW354
JW352
JW351
JW350
JW349
JW346
JW345
JW343
JW341
JW340
JW339
JW338
JW337
JW336
JW334
JW333
JW332
JW331
JW330
JW329
JW328
JW327
JW326
JW325
JW324
JW323
JW322
JW321
JW320
JW319
JW318
JW316
JW315
JW314
JW313
JW312
JW311
JW310
JW309
JW308
JW307
JW306
JW305
JW304
JW303
JW302
JW301
X302
X301
C309
C307
C306
C305
C303
C343
C302
CN302
CN301
SW313
SW312
W306
SW311
W305
W304
SW305
SW304
SW303
LED301
LCD301
JW397
JW395
JW394
JW393
JW392
JW391
JW389
JW388
JW387
JW386
JW385
JW384
JW383
JW382
JW381
JW380
JW379
JW378
JW377
JW376
JW375
JW374
JW373
JW372
JW371
JW370
Q309
Q302
(LIQUID CRYSTAL DISPLAY)
MAIN BOARD
CN607
(Page 35)
CD MECHANISM
DECK
PANEL BOARD
(BACK LIGHT)
US,CND
EXCEPT
EC55 US
EXCEPT AEP
,UK
EXCEPT US,CND
I
KEY-LEFT
BOARD
CN401
(Page 40)
F
KEY-CD
BOARD
W402
(Page 40)
G
KEY-RIGHT
BOARD
CN403
(Page 40)
H
1
2
A
B
C
D
E
F
G
H
3
4
5
6
7
8
• Semiconductor
Location
Ref. No.
Location
D301
E-5
D302
F-4
D303
E-4
D304
C-5
D305
E-5
LED301
B-2
IC301
B-4
IC302
B-6
Q301
B-2
Q302
D-5
Q303
D-5
Q304
E-5
Q305
E-5
Q306
F-4
Q307
E-5
Q308
F-5
Q309
E-5
Q310
E-5
Q311
E-2
Q312
E-3
Q313
E-3
Q314
E-3
Q315
E-2
Q316
E-3
Q317
E-3
Q318
E-3
39
39
HCD-EC55/EC77/GX99
HCD-EC55/EC77/GX99
7-10. SCHEMATIC DIAGRAM — PANEL BOARD —
•
See page 48 for Waveforms.
•
See page 54 for IC Pin Function Description.
0
3.2
3.2
8.3
5.3
7.3
0
5.1
8
7.3
5.3
8
0
5.1
0
5.1
0
0
0
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
0
0.7
0
6.6
4
8.4
4.5
7.7
0.7
4
0
0
3.4
3.2
3.2
1.2
1.3
3.2
1.4
3.2
0
0
3.4
0
0
0
3.2
0
0
0
1.3
1.2
3.2
0
0
0
0
0
0
3.4
3.4
3
3
3.2
3.2
0
3.2
2.1
2.1
2.1
3.2
1.4
2.7
0
0
0
3.2
3.2
3.2
0
3.4
3
3.2
1.6
3.4
3.4
0.9
0
3.4
3.4
0
3.2
0.9
3.4
2
0
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
No mark: CD PLAY
KEY-RIGHT
KEY-LEFT
KEY-CD
BOARD
BOARD
BOARD
CN401
(Page 40)
(Page 40)
(Page 40)
W402
CN403
CD MECHANISM
DECK
MAIN BOARD(1/2)
CN607
(Page 36)
1
2
*
*
*
*
*
*
*
2SC3052F-T1-LF
Q304
2SC3052F-T1-LF
Q303
R332
10k
C301
0.1
MC2836
D303
2SC3052F-T1-LF
Q305
Q306
RT1N441C-TP-1
R335
10k
R337
0
C342
0.1
R338
2.2
R339
2.2
R340
4.7k
R342
R421
220k
C308
0.1
Q307
2SA1235TP-1EF
R343
470k
Q308
RT1N441C-TP-1
Q310
2SC3052F-T1-LF
C309
22
50V
C343
22
50V
R346
47k
10k
R347
470
R354
47k
R355
470
R348
47k
R349
470
R350
47k
R351
470
R352
47k
R353
470
R358
47k
R359
470
R360
470
R361
47k
R356
470
R357
47k
R362
22k
R364
22k
R363
22k
R366
22k
R368
22k
R367
22k
R365
22k
R397
470
C319
22p
C320
22p
32.768kHz
X301
R396
0
C321
0.1
R382
10k
C340
0.047
R327
100
R326
100
R325
10
Q301
2SC3052F-T1-LF
R328
10k
R381
10k
C313
0.22
R380
470
R383
10k
R384
10k
R402
100k
R378 47k
R379 100k
R376
22k
R377
22k
100
R301
R302 100
R303 100
R304 100
R305 100
R306 100
R307 100
R308 100
R309 100
R310 100
R311 100
R312 100
R313 100
R314 100
R315 100
R316 100
R317 100
R318 100
R319 100
R320 100
R321 100
R322 100
R323 100
C310
0.1
C311
0.1
C312
0.1
C330
0.1
1
7
8
9
10
11
12
5
6
14
19
18
17
13
16
20
15
23
24
27
21
28
26
25
22
31
33
35
30
32
36
34
29
2
3
4
LCD301
1L0341Y23E0CA602
LED301
Q309
KTA1273-Y-AT
R341
33k
Q317
2SC3440-T12-1F
Q315
2SC3440-T12-1F
Q318
2SC3440-T12-1F
Q316
2SC3440-T12-1F
Q313
2SA1365-T112-1EF
Q311
2SA1365-T112-1EF
Q314
2SA1365-T112-1EF
Q312
2SA1365-T112-1EF
S301
R399
10k
2.2k
R406
2.2k
R413
1k
R405
1k
R412
MA111-TX
MA111-TX
MA111-TX
D302
KTA1271Y-AT
Q302
R334
10k
R331
100k
C302
10
50V
R345
4.7k
R344
2.7k
R324 100
R333
100k
R336
10k
C304
0.1
C307
470
6.3V
C305
10
50V
C303
10
50V
C317
1000p
R401
0
R400
0
R369
1k
R370
1k
R371
1k
R372
1k
R373
1k
R374
1k
R375
1k
R385
1k
R386
1k
R387
1k
22k
R419
100k
R420
D304
C332
0.01
C306
6.3V
470
R389
R392
R390
R393
TP301
TP302
TP303
TP304
TP305
TP306
TP307
TP308
TP309
TP310
TP311
TP312
TP313
TP314
TP315
TP316
TP317
TP318
TP319
TP320
TP321
TP322
TP323
TP324
TP325
TP326
TP327
TP328
TP329
TP330
TP331
TP332
TP333
TP334
TP335
TP336
TP337
TP38
TP339
TP340
TP341
TP343
TP344
5MHz
X302
NJL24H400A
IC302
R329
2.2k
MAZ8043GMLS0
D301
D305
TP342
1
2
3
4
5
6
7
8
9
10
11
12
13
13P
CN302
M2-
M2+
M1-
M1+
SW-COM
SW3
SW1
SW7
SW2
SW6
SW5
SW8
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
27P
CN301
M-GND
V-STBY
D-GND
O-CD-ON
I-P-MONI
O-CD-RST
I/O-BUS0
I/O-BUS1
I/O-BUS2
I/O-BUS3
O-CD-BUCK
O-CD-CCE
O-CD-REQ
O-CD-SBSY
O-AMP-ON
O-CD-M-MUTE
I-CD-ZDET
O-POWER
O-TP-REC-MUTE
O-FUNC-CLK
I-TP-STATE
O-FUNC-DATA
I-TU-DO
I-TU-ANSD
O-TU-CLK
O-TU-DI
O-TU-CE
R330
680
12345678
91
0
1
11
21
31
41
51
61
71
81
92
0
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
IC MB90803PF-G-130E1
IC301
O-POWER
O-AMP-ON
O-FUNC-CLK
O-FUNC-DATA
I-CD-SW3
I-CD-SW2
I-CD-SW1
O-CD-M1+
I-RMC
O-CD-M1-
O-CD-M2+
O-CD-M2-
XOA
X1A
VCC
VSS
I/O-CD-BUS0
I/O-CD-BUS1
I/O-CD-BUS2
I/O-CD-BUS3
I-CD-CHACK
I-CD-CLOSE
I-CD-STOCK
I-CD-OPEN
O-CD-BUCK
O-CD-CCE
O-CD-RST
O-LED-STBY
I-CD-ZDET
O-CD-M-MUTE
O-CD-REQ
A
VCC
I-TU-DO
O-TP-REC-MUTE
A
VSS
I-P-MONI
I-KEY1
I-KEY2
I-TU-ANSD
I-TP-ST
A
TE
I-KEY
-W
AKE
I-HOLD
O-CD-SBSY
GND
O-LED
I-MODEL
I-SUFFIX
I-RE-VOL
O-CD-ON
NC
MD2
MD1
MD0
RESET
O-TU-CE
O-TU-CLK
O-TU-DI
VLCD
COM0
COM1
CMO2
CMO3
SEG0
SEG1
VCC
VSS
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
VCC
VSS
X1
X0
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
0
R388
SW303
FUNCTION
SW304
SW305
TUNER/BAND
SW311
SW312
SW313
W304
4P
1
KEY-0
2
GND
3
AVCC
4
STBY-LED
W305
2P
1
KEY-1
2
GND
W306
2P
1
KEY-2
2
GND
C341 0.1
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
I/O-BUS0
I/O-BUS1
I/O-BUS2
I/O-BUS3
O-CD-BUCK
O-CD-CCE
O-CD-REQ
O-CD-SBSY
O-AMP-ON
O-CD-M-MUTE
I-CD-ZDET
O-POWER
O-TP-REC-MUTE
O-FUNC-CLK
I-TP-STATE
O-FUNC-DATA
I-TU-DO
I-TU-ANSD
O-TU-CLK
O-TU-DI
O-TU-CE
I-P-MONI
O-CD-RST
I-STOCK
I-CLOSE
I-SW2
I-CHACK
I-SW1
I-SW3
COM0
COM1
COM2
COM3
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
M2-
M1+
M1-
O-M2+
O-M1-
O-M1+
I-OPEN
SEG31
I-RST
I-HOLD
O-POWER
O-AMP-ON
O-FUNC-CLK
O-FUNC-DATA
I-RMC
I-VOL
O-TP-REC-MUTE
O-CD-SBSY
O-LED
I-MODEL
I-SUFIX
O-TU-DI
O-TU-CLK
O-TU-CE
O-CD-ON
I-TU-DO
I-KEY1
I-KEY2
I-TU-ANSD
I-KEY
-W
AKE
I-HOLD
I-VOL
I-KEY-WAKE
I-KEY1
I-KEY2
O-CD-M-MUTE
I-SUFIX
I-MODEL
O-M1+
O-M1-
O-M2+
O-M2-
O-CD-BUCK
O-CD-CCE
O-CD-RST
I-SW3
I-SW2
I-SW1
I/O-BUS0
I/O-BUS1
I/O-BUS2
I/O-BUS3
I-CHACK
I-CLOSE
I-STOCK
I-OPEN
I-CD-ZDET
O-CD-ON
M2-
M2+
M1-
M1+
I-P-MONI
STBY_LED
STBY_LED
I-RST
MD2
COM3
COM1
SEG0
COM2
COM0
SEG1
MD0
I-TP-ST
A
TE
I-RMC
O-LED
M2+
O-CD-REQ
Q307~Q310
CD MOTOR
CONTROLLER
CD MOTOR
CONTROLLER
Q311~Q318
DRIVER
MOTOR
LED DRIVER
+3.6VREG
RESET
SWITCH
+3.6VREG
RESET
RESET
(LIQUID CRYSTAL DISPLAY)
US,CND
VOLUME
SYSTEM CONTROLLER
REMOTE
CONTROL
RECEIVER
RECEIVER
1
2
3
TUNING +
TUNING –
M
L
M
L
CD u
x
F
G
H
I
PANEL BOARD
EC55
EC77
GX99
US
US
US,CND
US,CND
AEP, UK,RU
E2
E3
E51
MX
R392
R393
R389,
R389
R390
R390
1K :
1K
1K
22K
100K
100K :
10K
10K
10K :
10K : EXCEPT AEP,UK
39K :
2.2K :
4.7K
47K
(BACK LIGHT)
EXCEPT
US,CND
EXCEPT
3.3K
1
2
1
2
Not Used : AEP,UK
Not Used : US,CND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
A
B
C
D
E
F
G
H
I
J
K
L
Ver. 1.3
40
40
HCD-EC55/EC77/GX99
HCD-EC55/EC77/GX99
7-11. PRINTED WIRING BOARDS — KEY SECTION —
•
See page 29 for Circuit Boards Location.
:Uses unleaded solder.
1-872-058-
1-872-058-
1-872-056-
1
STANDBY
DISPLAY
+
–
DSGX
EQ
12
(12)
R407
R408
R409
R410
R411
DISC 2
DISC 3
DISC 1
R418
R417
R416
R415
R414
12
(12)
R407
R408
R409
R410
R411
DISC 2
DISC 3
DISC 1
DISC SKIP/
EX-CHANGE
R418
R417
R416
R415
R414
1-872-057-
12
(12)
PANEL BOARD
W304
(Page 38)
PANEL BOARD
W306
(Page 38)
F
H
PANEL BOARD
W305
(Page 38)
G
SW310
SW318
SW316
SW314
PLAY MODE/
TUNING MODE
KEY-RIGHT BOARD
SW310
SW309
SW308
SW307
SW306
W402
SW318
SW317
SW315
SW314
CN403
PLAY MODE/
TUNING MODE
KEY-RIGHT BOARD
KEY-CD BOARD
SW302
SW301
R404
LED302
CN401
KEY-LEFT BOARD
1
2
A
B
C
D
E
F
G
H
3
4
5
6
7
7-12. SCHEMATIC DIAGRAM — KEY SECTION —
KEY-RIGHT BOARD
KEY-LEFT BOARD
KEY-CD BOARD
F
PANEL
BOARD
W304
(Page 39)
G
PANEL
BOARD
W305
(Page 39)
H
PANEL
BOARD
W306
(Page 39)
R404
1k
T P409
T P410
T P411
T P412
SLR-325VCT31P
LED302
SW301
SW302
DISPLAY
1
2
3
4
4P
CN401
KEY- 0
GND
AVCC
STBY-LED
STANDBY
R409
10 k
R410
22 k
R407
2.2k
R408
4.7k
R411
47k
TP413
TP414
SW306
DISC 1
SW307
DISC 2
SW308
DISC 3
SW309
SW310
2P
W402
1
KEY- 1
2
GND
DISK SKIP/
EX-CHANGE
EX-CHANGE
R416
10 k
R417
22 k
R414
2.2k
R415
4.7k
R418
47k
TP415
TP416
SW314
SW315
SW316
SW317
DSGX
SW318
EQ
1
2
2P
CN403
KEY- 2
GND
PLAY MODE
/TUNING MODE
/TUNING MODE
1
2
3
4
5
A
B
C
D
E
Click on the first or last page to see other HCD-EC55 / HCD-EC77 / HCD-GX99 / MHC-EC55 / MHC-EC77 / MHC-GX99 service manuals if exist.