Read Sony ICF-CD843V Service Manual online
ICF-CD843V
13
13
25
22
20
16
18
12
19
20
11
FM
RF AMP
FM/TV
LPF
MPX
DECODER
TV/FM
OSC
AM/FM: 1/2
TV: 1/8
PHASE DETECTOR
CHARGE PUMP
DATA SHIFT REGISTER
LATCH
FMIN
MPXI
R-CH
ARFI
150kHz
DETO
45kHz
FMRO
TVRO
AMLO
FTLO
FMIN
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
AMIN
29
IFCT
12
BAND
1
VCO
TV/FM/AM RF AMP,
MIX, OSC, DET, MPX
IC1
FM/AM PLL
IC51
SYSTEM CONTROLLER
IC401 (2/2)
RV2
AM IF
RV1
FM STEREO
D4
VT
AM
OSC
FM
LMT
FM
DET
AGC
AMP
AM
BPF
19
REGV
24
TV
RF AMP
TVIN
ANT1
(FM/TV)
CT3, L3
TV(7 – 13ch)
WEATHER(1 – 7ch)
TRACKING
CT2, L2
CT1, L5
L2
FM RF
CT2
BPF1
AM TRACKING
BPF
L5
AM
FERRITE-ROD
ANTENNA
L1
AM OSC
X51
75kHz
AM
RF AMP
26
CT1
L3
TV RF
CT3
D3
D2
(1/2)
D2 (2/2)
D5
+
+
35
LOUT
3
L OUT 5
R OUT
STANDBY
3
8
NF R
13
R IN
12
NF L
10
L IN
11
36
AMP
Q102
OSC BUFFER
Q2
AM VCO
VOLTAGE
FM/TV(2-6ch)
TRACKING
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
LOW-PASS
FILTER
Q52, 53
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
CD-L
T901
POWER
TRANSFORMER
D601 – 603
LED 3.9V
D604 – 609
(LCD BACK LIGHT)
Q403,
Q404
Q404
SP101
(L-CH)
(L-CH)
SP201
(R-CH)
PSN
REGULATOR
VCO
BAND SELECT
Q51
15
PD
5
BO1
6
BO2
PSN
SWALLOW
COUNTER
1/16, 1/17, 4BITS
12BITS
PROGRAMMABLE
DIVIDER
CCB
I/F
(AC IN)
RECT
D901 – 903
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
CLK
2
3
1
DI
XIN
XOUT
CE
CLK
DI
DI, CLK, CE
CE
70
71
X401
32.768kHz
74
75
X402
4.19MHz
A
(Page 12)
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
B
(Page 12)
: CD PLAY
: FM
: TV
: AM
• R-ch is omitted due to same as L-ch.
• SIGNAL PATH
5-2.
BLOCK DIAGRAM – MAIN Section –
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