Read Sony ICF-CD873L Service Manual online
ICF-CD873L
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– 18 –
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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
05
A
(Page 14)
T901
POWER
TRANSFORMER
AC IN
•
SIGNAL PATH
: CD PLAY
: TUNER (FM/MW/LW)
SHIFT CK
Q401
CT401
Q401, 402
SHIFT CLOCK
Q402
X402
4.194MHz
CD 5V
(CD SECTION B+)
TUNER SECTION B+
5V
VT B+
RESET
POWER AMP
(IC350, 351) B+
SW
X1
X2
60
58
59
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 16)
D
(Page 16)
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
XT1
XT2
55
56
SEG1 – SEG21
LIQUID CRYSTAL DISPLAY
LCD401
MAIN
CLOCK
70 – 80, 1 – 10
COM0 – COM2
21 – 23
SYSTEM CONTROLLER
IC401 (2/2)
MUTING CONTROL
SWITCH
Q320
Q353
SPEAKER SWITCH
MUTE
MUTING
Q220
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)
Q403
Q404
Q403 – 405
LED DRIVE
Q405
B+ (
µ
5V)
A MUTE
V MUTE 52
35
53
MEGA BASS ON
DRIVE
Q406
D416
MUTING CONTROL
SWITCH
Q407
BASS ON
POWER ON
49
BUZZER
61
COLOR
20
KEY MATRIX
S401 – 420
D401
D404
KS0 – KS3
VERSION1
VERSION2
•
KS0
KS1
KS2
KS3
D403
D402
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
CN307
1
2
CN305
1
2
3
4
6
SP301
MEGA BASS
SPEAKER
S423
BRIGHTNESS
LOW
HIGH
13 – 16
KEYRET0 – KEYRET4
63 – 67
17, 18
D412, 413
10
8
6
4
1
3
5
7
KR0
KR1
KR2
KR3
2
9
KR4
RECT
D903, 904
RECT
D901, 902
µ
5V
(SYSTEM CONTROLLER (IC401) B+)
CD 6V
MOTOR/COIL
DRIVER (IC503) B+
BP
(CD TEST AUTO)
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