Read Sony ICF-CD873 Service Manual online
ICF-CD873
– 19 –
– 20 –
– 21 –
6-3.
BLOCK DIAGRAM – MAIN Section –
POWER AMP
(FOR MEGA BASS SPEAKER)
IC351
POWER AMP
(FOR FRONT SPEAKER/HEADPHONE)
IC350
CD/TUNER SELECT SWITCH
IC320
CSV (COMPUTER SOUND VOICE)
PROCESSOR
IC601
05
A
(Page 16)
T901
POWER
TRANSFORMER
AC IN
•
SIGNAL PATH
: CD PLAY
: TUNER (FM/AM)
SHIFT CK
Q402
Q401, 402
SHIFT CLOCK
Q401
X402
4.194MHz
CD 5V
(CD SECTION B+)
TUNER SECTION B+
5V
VT B+
RESET
POWER AMP
(IC350, 351) B+
SW
X2
X1
60
59
58
68
CD ON
36
AC IN
38
8
12
3
CD
L-CH/R-CH
L-CH/R-CH
CD L-CH
CD R-CH
B+
(CD 5V)
TUNER
L-CH/R-CH
L-CH/R-CH
TUNER
L-CH
L-CH
TUNER R-CH
TUNER ON
C
(Page 18)
D
(Page 18)
MAIN BOARD (3/3)
LED BOARD
KEY BOARD
VOLUME BOARD
POWER BOARD
+5V
REGULATOR
Q901
+6V
REGULATOR
Q902
RECT
D905 – 908
LINE
FILTER
LF901
CD B+
SWITCH
Q903
RESET SIGNAL
GENERATOR
IC402
MUTING
Q120
MEGA BASS
MUTE
Q321
VOICE
MUTE
Q350, 351
10
5
CN301
(1/2)
1
2
CN302
(1/2)
7
6
CN303
(1/2)
4
2
CN401
3
5
7
9
CN402
8
6
4
2
CN302
(2/2)
5
2
3
1
J301
(HEADPHONE)
2
HEADPHONE
BOARD
CN303
(2/2)
6
7
9
3
5
CN304
(2/2)
5
4
D911
D415
X401
32.768kHz
XT2
XT1
56
55
SEG1 – SEG21
LIQUID CRYSTAL DISPLAY
LCD401
70 – 80, 1 – 10
COM0 – COM2
21 – 23
SYSTEM CONTROLLER
IC401 (2/2)
MUTING CONTROL
SWITCH
Q320
Q353
SPEAKER SWITCH
MUTE
MUTING
Q220
CSV (IC601): US model only
Q151
Q151, 251
SPEAKER ON
SWITCH
Q251
IN+
IN–
OUT
OUT
IN2
IN1
POWER ON
BUZZER
V MUTE
BASS ON
VOL OUT
VOL IN
R-CH
L-CH
–1
–2
D321
D320
D417
8
10
OUT2
OUT1
3
1
11
8
1
4
10
9
2
3
12
6
13
5
D350
D351
B+
(
µ
5V)
D422 – 424
(LCD BACK LIGHT)
D419 – 421
(LCD BACK LIGHT)
Q602
Q403
Q404
Q403 – 405
LED DRIVE
Q601
Q405
B+
(
µ
5V)
B+
(
µ
5V)
Q601, 602
ATTENUATE
SWITCH
X601
4.19MHz
XT
A MUTE
V MUTE
52
2
3
35
53
MEGA BASS ON
DRIVE
Q406
D416
MUTING CONTROL
SWITCH
Q407
MAIN
CLOCK
CT401
CT401
BASS ON
POWER ON
49
BUZZER
46
DATA
47
CLK
48
LAT
50
51
NAR
61
15
23
14
8
17
22
20
BUSY/COLOR
SO
AOUT
(US)
(EXCEPT US)
(EXCEPT US)
(US)
(US)
SI
NAR
20
KEY MATRIX
S401 – 420
D401
D404
KS0 – KS3
VERSION1
KS0
KS1
KS2
KS3
D403
D402
17
ALARM
19
CN301
(2/2)
3
6
5
7
POWER ON
MUTE DRIVE
Q904
HEADPHONE
MUTE DRIVE
MUTE DRIVE
Q352
HEADPHONE
MUTE
Q150, 250
SPEAKER
SWITCH DRIVE
Q354, 355
CN306
4
1
3
2
CN304
(1/2)
6
8
10
9
2
1
RV301
VOLUME
RV302
MEGA BASS
+
+
+
SP201
R-CH FRONT
SPEAKER
SP101
L-CH FRONT
SPEAKER
KH301
1
2
CN305
1
2
3
4
6
SP301
MEGA BASS
SPEAKER
BUSY
RST
ST
XT
S422
SOUND LEVEL
S423
BRIGHTNESS
LOW
MID
HIGH
S421
SOUND MODE
RIVER
BIRD
BUZZER
LOW
HIGH
13 – 16
KEYRET0 – KEYRET4
63 – 67
D408 – 411, 418
(Refer to NOTE 1.)
D408
D409
D410
D411
D411
D418
NOTE 1
D405
D406
D407
10
8
6
4
1
3
5
7
KR0
KR1
KR2
KR0
KR1
KR2
KR3
KR4
KR0
KR1
KR1
KR2
Australian model
Italian model
Italian model
US model
Canadian model
All models
All models
KR3
2
9
KR4
RECT
D903, 904
RECT
D901, 902
µ
5V
SYSTEM CONTROLLER (IC401),
CSV (IC601) B+
CD 6V
MOTOR/COIL
DRIVER (IC503) B+
BP
(CD TEST AUTO)
V-RESET
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