13/19" Head Amp Circuit - Zenith TVBR1342Z Service Manual

1 2
G
F
TO SHEET 9
1 REC/PB
PLAYBACK LUMINANCE SIGNAL
0.5V 20µs/div
PLAYBACK VIDEO SIGNAL
AUDIO SIGNAL(REC)
AUDIO SIGNAL(PB)
E
TUNER VIDEO SIGNAL
RECORD LUMINANCE SIGNAL
RECORD COLOR SIGNAL
2 REC/PB
D
100mV 0.5µs/div
C
3 PB
100mV 5ms/div
B
4 REC
20V 10µs/div
A
CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE SYMBOL
REPLACE ONLY WITH PART NUMBERS SPECIFIED.

13/19" Head Amp Circuit

3 4
FROM TV POWER
GND
W826
P.CON+5V
C4046
0.01 uF
C4051
0.01 uF
L4001
P.CON+5V
100uH 0305
FROM/TO MOTOR
CP4001_1 TOC-C04X-B1
4 SP-pF1 (R)
C4001 C4011
3 SP COM
50V 1 uF
2 SP-pF2 (L) 6.3V uF 47
ENV_DET
1 C4009 0.1 uF
W864 R4009 P/L
COMP
C4002
15.6KHZ TRAP
R4007
L4004 2623003
Y/C_AUDIO 0.01 uF
NC
680
R4008
12K
R4013
P.CON+5V
FROM/TO A/C HEAD
CP4002
IMSA-9604S-06Z14
6 AUDIO PB
R4001 820
5 AUDIO REC
BIAS CTL
5.2
CTL+ SW
Q4005
4 CTL+
V.REC_ST_H 0
Q4003
CTL- 2SA1318
3 CTL- DTA124ES
COIL,BIAS OSC
5.3
2 AE HEAD(-) T4001
1626007
1 AE HEAD(+) 0
AUDIO
R4002 6 1
0.7
PB SW
5 2
Q4001
10K
2SC3331
0 4 3
AUDIO
PB SW 0
R4003
Q4002 0.7
4
2SC3331
10K
0
TO F/E HEAD
CP4003
TMC-T02X-E1
2 FE HEAD(GND)
1 FE HEAD(HOT)
.
5 6
L4002
TRICK PB SWITpF 100uH
Q4011 0305
DTC144EuF
1.1
L4008
0
100uH 0305
0
R4053
6.8K
R4070
R4014
10M 1/4W
1.8K
TP4001
3
NC NC
NC NC
HEAD AMP IC 2.4 2.4 2.4 0 2.4 5.0 2.3 2.3 2.8 2.3 1.5 2.0 0 0 1.4 4.0 2.3 2.2 3.0 4.1 3.4 4.9 3.4 5.0 5.0
IC4001
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62
LA71077BM-MPB
0 A-Vcc
C-GND
KIL REG
H.A GND
VX01
DET
1.8
pF4
1.8
Vref KIL
REC EP
1.8 2.3V BEFORE
H
OUT BGA
KIL
P
L
1.8 ALC AFTER
BGA
PB KIL R
pF3
H.AMP
0
AMP B.D. P
H.A GND H SW
R
P
5.1
C-LPF
L
H.A VCC
R
ACC
1.8 pF2 BGA DET
GCA
P R
1.8
AGC
+
AMP 4.21M Main B-UP ACC
REC SP
1.8
OUT BPF CONV AMP AMP
H R
1.8 BALANCER
H.AMP
L Sub 3.58M
pF1
SW
0 CONV BPF2
REC AGC SUB
FILT
LPF
FM
1.0
ENV DET AGC NOMAL
FM
REC FM DETAIL
MOD
4.6
FM-EQ
COMP OUT DEM
R P
DELAY S-EQ
0
R-EQ WC
A.GND MUTE LINE FM-EQ DOUBLE
DC
TEST
C4016 AMP PB LIM EMPHA
2.8 ALC-LEVEL
FM-EQ
AUTO
R4012 25V 4.7 uF
0.3
BIAS
PB
PHASE-EQ SQPB
22K
0 Vref
PB
REC
5.1 /EE VHS
AMP
PB/EE REC:
CTL
EQ EP/LP
2.4
AMP
AMP PB:EP
10K
11 2 3 4 5 6 7 8 9 0 11 12 13 14 15 16 17 18 19
C4010
2.4 2.4 2.4 2.4 0 2.4 2.4 1.5 5.0 5.0 0 0 0.8 0.8 0.8 0 0 4.9 0 1.6
6.3V 47 uF NC
R4011 R4020
22K 10K
5.2
R4036
5.2
0
47K
R4025
330K
C4020
3.4
0.01uF
0.4
0
BIAS OSC
C4075
Q4006
2SD734 330pF
5-13 P/L = See parts list for part description
7 8
W836 W896
2
C4073
NC
2.5 5.0 4.2 2.3 0.1
47P pF
61 60 59 58 57 56 55 54 53 52 51
CLOCK 0 2.6
ALWAYS C-VCC VDD 4Fsc
SLD 5V PULL BuFFER
320FH
2.2 2.2
VCO TIMMING Q4009
OUT
OUT
2SA1037K
0 0
DRIVER AUTO-BIAS
REC PR R4060
2.7
APC CCD CLAMP
IN
PB REC C4058 220K R4062
2.5
APC AFC
6.3V 22 uF C4059 220K
3.0
C.SYNC VCA
25V 4.7 uF
C4060
3.2
C4061
3.58M CLAMP
BPF1 50V 4.7 uF
50V uF 1
2.8
VCP
N.L.
C4007
2.8
YNR/COMB R4063 3.3M TU_VIDEO
DEEN
P
C4052 50V uF 1
4.9
SYNC
Y-LPF
NC1
R4056
DET
0.01 uF
2.8
PB-Y
P R R4057 C4062
Y/C NC
1M
2.2K 50V uF 1
MIX 3.5
V/I
PB-C AFC
CONV P R
2.5
13 2 C4053 0.01 uF FRONT_VIDEO
R P
C4071
C4057 16V 10 uF
AGC 1.5
ENH
R 50V 1 uF
1/2
P TC2 D4005
SYNC
8.2K
1.0
SEP V-AGC R4055
NL
R MTZJ6.8B
FBC
R4078 100 CHROMA_VIDEO
VIDEO OUT 3.0
6DB
CLAMP
pFara 4.3
H.SYNC
INS.
C4054 C4082
R
4.4
NC 0.047 uF R4052
P TEST 0.047uF
0 33 1/4W
W815
4.6
DUMMY_V.SYNC
Y-Vcc Y-GND L4009
100uH
20 21 22 23 24 25 26 27 28 29 30
P.CON+5V
0305
R4016
5.0 1.0 0.2 2.0 3.4 2.8 0 2.1 1.0 4.8 Y/C_VIDEO
NC
100
1
SD_VIDEO
2.6
2.0
0
BuFFER
L4007 C4047
Q4007
2SA1037AK
100uH 22P pF
R4049
EP SW.
Q4008
1K
2SC2412K
4.2 5.0
4.8
R4024
10K
PROV = Provisional
9 10
This SCHEMATIC
applies to the
following models
only:
TVBR1342
TVBR1942
FROM/TO IN/OUT
FRONT_AUDIO
FRONT_VIDEO
TO SHEET 17
Y/C_AUDIO
Y/C_VIDEO
FROM/TO MICRO
SP/LP/EP-H
TRICK_PB-H/EE-H
V.REC_ST_H
C_ROTARY
VCR_A_MUTE
REC/EE/PB
DUMMY_V.SYNC
CTL- TO SHEET 11
CTL+
DOC_XO_CTL
INPUT_SEL
COMP
ENV_DET
H.SW
SD_VIDEO
FROM/TO CHROMA
TU_VIDEO
TU_AUDIO
CHROMA_VIDEO
TO SHEET 12
Y/C_AUDIO
H.SYNC
TVBR2000 SHEET 13