JVC TV-20F242 Service Manual page 65

[SYSCON PCB HIFI CIRCUIT DIAGRAM]
A B
HIFI SCHEMATIC DIAGRAM
8
(SYSCON PCB)
7
6
5
4
3
2
1
A B
No.51768
C
34
AUDIO_OUT_R
ST_SELECT
35
AUDIO_OUT_L
L5506
P.CON+9V
100uH
NORMAL_A
Y/C_AUDIO
NOTE: THE DC VOLTAGE AT EACH PART WAS
MEASURED WITH THE DIGITAL TESTER
DURING PLAYBACK
C
TV-20F242 TV-20F242
D E
C5514
0.33 B
C5561
100P
C5560
R5512 HIFI AUDIO/H.AMP/DEM
100P
IC5501
2.7M CH
AN3662FBP
NC
2.2 2.1 3.9 0 2.4 1.8 0.3
48 47 46 45 44 43 42
C5506 0.1 B
DEM_BLK
3.9 PILOT LOGIC
DET
C5507 0.1 B
INPUT MUTE
75uS
VCA CTL
SL
3.8 DE-EMPH
STEREO PLL
FILTER
LPF
5.4
L.R
C5508 0.1 B
SAP DEMOD
DEMOD
2.9
R5526
C5516 (L.R)/SAP
R5503 10M
SWITCH
4.6
2.2K 16V 10 KA
C5509 MUTE
2.0
50V 2.2 KA
AMP
SW19
R L
0
MUTE
L
1.8
R5525
C5552
SW17
AMP
L
R
4.5
2.2K 16V 10 KA
RFC
L
9.0 MIX
SAP
C5510
NC
DET
16V 47 KA SW22 R
4.6
NC
0.2
C5512
DBX
NOISE REDUCTION
2.6
16V 10 KA
R5501 C5513
L
INPUT_SW(L)
1.1
15K 1/4W 0.1 B
MATRIX
R
R5502
INPUT_SW(R)
0.7
5.6K
C5556
0.4 VREF1
0.0022 B
1 2 3 4 5 6 7
2.6 NC 0.1 2.6 NC 0.1 2.2 2.6 2.0 0.4
W930
NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME
OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE
D E
2-23 2-24
F G
CH
NC
0 5.2 0 0 1.8 0 2.6 0.7 2.6
41 40 39 38 37 36 35 34 33
C5540 0.015 B
ZZ-PROM
2.6
HIFI ENV
C5541 0.22 B
VCO-F0
TP5501
ADJ
2.6
LOGIC
S/N
SW12
2.0
PNR RCH
D5501
SW NOISE PB REC
V.REC_ST_H
SW21
2.0
1SS133
RCH
SW9
HIFI_ENV
VCO
AUDIO
3.9 C5549 0.1 B
FROM 1PIN
LIMIT
REC LPF
HIFI_H.SW
R SW18
BS
PC PB LPF 3.5
HPF
HIFI C5542 0.1 B
NOISE
MIX
HIFI_H.SW
DET 0
RCH BPF
TP5502
SW16 FM UM
LINER
SW10
SW 5.3
MIX LCH BPF
C5543 0.01 B
HIFI
HOLD
BS
TIMING 0 C5553
PC PB LPF
FROM 3PIN 470PCH
0 C5554
AUDIO CURR
LIMIT AMP 470PCH
-
SW14
0.7 C5544 0.01 B
SW4
-
SW NOISE +
SW2
0
PNR LCH
C5551
C5545 0.1 B
S/N
MIX DET 2.7
SW15 0.01 B
H C5546 0.015 B
REC LPF
AGC
2.6
LCH VCO SW11
L
C5547 16V 10 KA
C5550 L5505
2.6
C5548 16V 10 KA
22uH
6.3V 47 KA
0.7 0305
8 9 10 11 12 13 14 15 16
0 0.1 0 2.2 2.6 0 0.1 2.6
W948
AUDIO SIGNAL(REC)
AUDIO SIGNAL(PB)
F G
No.51768
H
8
FROM/TO I/O
7
FRONT_AUDIO_IN_R
FRONT_AUDIO_IN_L
REAR_AUDIO_IN_R
REAR_AUDIO_IN_L
AUDIO_OUT_R
AUDIO_OUT_L
FROM/TO SOUND AMP
AUDIO_OUT_L
AUDIO_OUT_R
6
FROM/TO CHROMA/IF
TU2_AUDIO
TU1_AUDIO_A
W855_1
FROM/TO
Y/C/A/H.AMP
HF1
FSC
5
Y/C_AUDIO
HF2
HF_COM
NORMAL_A
GND
FROM/TO POWER
P.CON+5V
P.CON+9V
GND 4
FROM/TO MICON
V.REC_ST_H
HIFI_ENV
HIFI_H.SW
SCL
SDA
ST_SELECT
3
VCR_A_MUTE
2
PCB010
VMX188
1
H