Sony ICF-CD873 Service Manual page 22

ICF-CD873
• IC Block Diagrams
– MAIN Board –
IC1 CXA1238M-T6
28
30 29 27 26 25 24 23 22 21 20
FM FRONT-END
AM FRONT-END
REGULATOR
MPX
VCO REGULATOR
1/2
PD1
COUNTER
1/2
PD2
COUNTER
AUTO
BLEND
MONO/STEREO
MUTING
SELECT
DECORD RIPPLE
AMP FILTER
1 2 3 4 5 6 7
IC50 BU2614FS
16 15 14 13 12 11 10 9
MAIN CONTROL IF
PHASE
PRESCALLER COUNTER
DETECT
OUTPUT
I/O CONTROL
CONTROL
REGISTER
1 2 3 4 5 6 7 8
19 18 17 16
FM IF/
DISCRI
AM IF/
DET
TUNING
INDICATOR
BAND-PASS
MUTE
8 9 10 11 12 13 14 15
– 37 –
IC501 CXA1782CQ
36 35 34 33 32
LEVEL S
APC
RF IV AMP1
RF IV AMP2
TTL
FE BIAS 37
IIL
F
38
F IV AMP
E 39
E IV AMP
EI 40
TE AMP
VEE 41
TED 42
LPFI 43
TEI
44
DFCT
ATSC 45 WINDOW COMP
TZC 46
ATSC
TDFCT 47
DFCT
VC FS4
48
2 3
1
31 30 29 28
MIRR
DFCT
IIL DATA REGISTER INPUT SHIFT REGISTER
ADDRESS DECODER
OUTPUT DECODER
TOG1-3 FS1-4 TG1-2 TM1-7 PS1-4
BAL1-3
FZC COMP
TRACKING
HPF COMP LPF COMP
PHASE
COMPENSATION
TM6
TG1
TM5
TM4
FCS PHASE
TZC COMP
COMPENSATION
TM3
FS1
TM1
TM7
FS2
4 5 7 8 9
6 10
– 38 –
27 26 25
IIL
24 SENS
TTL 23 C.OUT
TTL
22 XRST
21 DATA
20
XLT
IIL
19 CLK
18 VCC
ISET 17 ISET
16 SL O
15 SL M
14 SL P
TM2
13 TA O
11
12