Read Sony ICF-CD523 Service Manual online
26
ICFCD523
•
IC Block Diagrams
– MAIN Board –
IC1
CXA1238M-T6
IC51
BU2614FS
VCO
REGULATOR
FM FRONT-END
AM FRONT-END
MPX
REGULATOR
MONO/STEREO
SELECT
DECORD
AMP
MUTING
AUTO
BLEND
TUNING
INDICATOR
AM IF/
DET
FM IF/
DISCRI
RIPPLE
FILTER
BAND-PASS
MUTE
1
27
28
29
30
24
25
26
21
22
23
18
19
20
16
17
2
3
4
5
6
7
8
9
PLL LPF1
PILOT DET LPF2
PILOT DET LPF2
ST IND/VCO CHECK
L-CH OUT
VCC
R-CH OUT
RIPPLE FILTER
AGC AFC1
10
AGC AFC2
13
FM IF IN
14
AM IF IN
15
BAND SELECT
11
GND
12
TUNE IND
1/2
COUNTER
1/2
COUNTER
PD1
PD2
FM/AM FE OUT
FM GND
FM RF IN
AM RF IN
FM RF
REG
FM OSC
AFC
AM OSC
MUTE
FM DISCRI
GND
PLL LPF2
MPX REG
VCO
FM IN
PD1
VSS
VDD2
VDD1
AM IN
P2
IF-IN
XOUT
XIN
CE
CK
DA
CD
P0
P1
16
12
13
14
15
8
9
10
11
4
5
6
1
2
3
7
IF
COUNTER
OUTPUT
CONTROL
I/O CONTROL
REGISTER
MAIN CONTROL
PRESCALLER
PHASE
DETECT
1
CH2 OUTPUT
2
VCC
4
NC
11
NC
12
PRE GND
5
POWER GND
3
CH1 OUTPUT
OUTPUT
AMP
6
STBY
OUTPUT
AMP
INPUT
AMP
STANDBY
SWITCH
7
FILTER
RIPPLE
FILTER
8
P.P
9
CH1 INPUT
10
CH2 INPUT
POP NOISE
PREVENTION
BLOCK
REF
AMP
INPUT
AMP
TSD
PROTECTOR
IC351
LA4629
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