Service manual

CA-10
CA CIRCUIT DESCRIPTIONS
<<Figure CA-9>>
ICX2200 powers its IF section using +9VPIF (pin 9) and +9VSIF (pin 48). The ICs main VCC is a
+9VF supply to pin 46. IF signal continues from pin 47 at nearly 2Vp-p to an FM trap where SIF is
separated from PIF. SIF reenters ICX2200 at pin 52, the limiter. From this, composite audio is developed
and transmitted from pin 2 of the video processor to the audio circuitry. The remaining PIF passes through
Q1202 for de-amplification to 1Vp-p. The resulting signal, denoted TVIN, is passed to both the Jungle IC
at pin 37 and pin 5 of IC2902 (refer to the jack-pack and switching section below).
AFT (automatic fine tuning) is also derived from the video processor at pin 44. This signal feeds the micro-
processor, IC6000, to generate minute tuning adjustments so as to maintain optimum channel quality.
Part Location Part # Notes
TU6000 175-02721 Refer to Service Manual
175-02771 for Corresponding Models
ICX2200 221-01165 All Models
<<Table CA-2>>
C
1
2
3
4
5
6
7
8
9
8
49
50
51
52
53
54
55
56
NC NC
SND-OUT
RF-AGC
SIF
AGC-FIL
PIFGND
PIF-IN
PIF-IN
PIF-VCC
SIF-VC
PIFTANK
PIFTANK
SIFGND
LIMITER
AUDIN
EXT-AUD
DE-EMPH
47
TV/DET
46
10
11
LOOPFIL
APCFIL VCC
ICX2200
TP1248 TP1245
C1214
C1213M
TP1201
+9VSW
L1203L1200
C1215M
+9VSIF
C1216
+9VPIF
R1225 R1200M C1200M
R1201M
3
2
1
L1202
R1210M
C1205M
C1206
R1231M
TP1200
1
2
4
5
3
U1200
R1211M
C1204M
R1209M
+9VPIF
R1206M
Q1200
L1201
C1202M
R1205M
R1204M
R1203M
C1201M
R1202M
IF
R1207M
R1208M C1203M
+9VSW
R1212M
C1208M
C1207
U1201
R1214M
C1217M
C1218M
L1204
R1215M
+9VPIF
C1209M C1210
C1212
R1213M
C1211M
Q1201
TP1202
R1216M
R1217M
R1218M
U1202
L1205
R1219M
Q1202
C2237M
R1221M
R1220M
TVIN
3
2
1
L1206
+9VSIF
C1219M
+9VSW +9VF
L1207
C1220M C1221M
C1222
6
4
AGC
Pin 1,
TU6000
Composite
Audio
4