13/19" Video Block Diagram - Zenith TVBR1342Z Service Manual

1 2
G
F
This schematic
applies to the
following models
only:
TVBR1342
TVBR1942
E
CP4001
2 SP-CH2 (L)
CYL SP COM
3
4
SP-CH1 (R)
MICON/IN/OUT/
D
OPERATION/
DECK
COMP
CP4003
1 FE HEAD (HOT)
FE HEAD
FE HEAD (GND)
C 2
CP4002
6 AUDIO PB
B
5 AUDIO REC
4
CTL+
A/C HEAD
3 CTL-
2 AE HEAD(-)
1 AE HEAD(+)
A
CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE SYMBOL
REPLACE ONLY WITH PART NUMBERS SPECIFIED.

13/19" Video Block Diagram

3 4
X4001
3.579545MHz
Y/C/AUDIO/CCD/
HEAD AMP IC
IC4001
LA71067M-MPB
62 51
61
PULL
VX01
TIMMING
L
NC 85
H.SW
REC
H FM-EQ
84
AGC KIL
AMP
83
C-LPF
H
P R
82
NC H.AMP
SW
GCA
88
L
R
P
FM
89
AGC
90
DELAY
H
PB
H.SW
FM-EQ
91
L
PB
DOUBLE
94
PHASE-EQ
LIM
7 REC AMP
5
6
AUTO BIAS
EQ
AMP
4
PB.EE
99 1
3 2
T4001
Q4005
5 2 BIAS CTL
6 3
Q4006
BIAS OSC P. CON+5V
4 1
Q4003
Q4001, Q4002
AUDIO PB SW SW
.
5 6
Q4009
BUFFER
NC
49
53 47
OUT
CLAMP
DRIVER CCD
NL
FM WC DETAL
MOD DC EMPHA ENH
V/I
CONV
P
Y-LPF
R
3.58M YNR/
B-UP Main
COMB
AMP CONV BPF2
P N.L.
ACC
DEEM
3.58M
AMP
BPF1
R
KIL NC1
PB
B.D.
AMP
Y/C MIX
P
FM
SUB
DEM
LPF
R
V-AGC
P
R
LINE
AMP ALC
MUTE
SYNC
SEP
42 38
100 96 98 97 80 76
5-4 P/L = See parts list for part description
7 8
59
55
30
19
CLAMP 25
P
28
R
VCA 46
CLAMP
44
Y/C R/P 16
AUDIO R/P
17
C ROT 14
1/2
13
RF SW IN
AUDIO
12
FBC
MUTE
H.A R/P 11
ENV DET 93
Chara
31
INS.
Q4007
6dB
35 BUFFER
34
2 3
L4004
PROV = Provisional
9 10
SP/LP/EP-H
MICON/IN/OUT/
INPUT_SEL
OPERATION/
TRICK_PB-H/EE-H
DECK
DOC_XO_CTL
REC/EE/PB
C.ROTARY
H.SW
VCR_A_MUTE
MICON/IN/OUT/
V.REC_ST-H
OPERATION/
DECK
ENV.DET
DUMMY_V.SYNC
SD_VIDEO
H.SYNC
TV
MICON/IN/OUT/
FRONT_AUDIO
OPERATION/
DECK
FRONT_VIDEO
TU_VIDEO
TU_AUDIO
TV
CHROMA_VIDEO
Y/C_AUDIO
MICON/IN/OUT/
CTL+
OPERATION/
CTL-
DECK
TVBR2000 SHEET 4