Read Sony ICF-CD843L Service Manual online
ICF-CD843L
14
14
5-3. BLOCK DIAGRAM – MAIN Section –
60
POWER ON
52
BUZZER
61
A MUT
76
RESET
48
CD ON
RADIO ON 59
CD LED
RADIO LED
BUZZER LED
68
BACK LIGHT1
49
AC IN
SYSTEM CONTROLLER
IC401 (2/2)
L OUT 5
R OUT
STANDBY
3
8
NF R
13
R IN
12
NF L
10
L IN
11
AMP
Q102
BUFFER
Q108
AMP
Q101
MUTING
Q106
MUTING
Q405
B+ SWITCH
Q1
RV301
3.3V
R-CH
R-CH
R-CH
D303
Q301
VOLUME
S301
ON OFF
MEGA BASS
BASS BOOST
SWITCH
Q103
STANDBY
SWITCH
Q302, 303
+3.3V
REGULATOR
Q951
LIQUID CRYSTAL DISPLAY
LCD401
+6V
REGULATOR
Q952
+3.9V
REGULATOR
Q953
+3.9V
REGULATOR
Q955
POWER AMP
IC302
51
BUZZERMUTE
T901
POWER
TRANSFORMER
D601 – 603
LED 3.9V
D604 – 609
(LCD BACK LIGHT)
Q403,
Q404
Q404
SP101
(L-CH)
(L-CH)
SP201
(R-CH)
(AC IN)
RECT
D901, 902
VT
3.3V
MOTOR 6V
TU 3.3V
CD 3.3V
RECT
D905, 906
RECT
D907 – 910
B+ SWITCH
Q305
67
BACK LIGHT0
XT2
XT1
X2
X1
3.9V
LED 3.9V
RESET SIGNAL
GENERATOR
IC402
D402
70
71
X401
32.768kHz
74
75
X402
4.19MHz
78 – 80
KEY0 – KEY3
43 – 46
COM0 – COM3
6 – 9
SEG0 – SEG27
10 – 37
Q401,
Q402
Q402
Q401 – 404
LED DRIVE
LED DRIVE
S601 – 621
: CD PLAY
: FM
•
R-ch is omitted due to same as L-ch.
•
SIGNAL PATH
C
A
CD-L
TU-L
(Page 12)
(Page 13)
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