25" Main Ic Block Diagram - Zenith TVBR1342Z Service Manual

1 2
G
Y/C/AUDIO/CCD/HEAD AMP IC
IC4001
LA71067M-MPB
This schematic
F
applies to the
following model
only:
TVBR2542
E
CP4001
2 SP-CH2 (L)
CYL
3 SP_COM
4 SP-CH1 (R)
D
CP4003
FE HEAD (HOT)
1
FE HEAD
2 FE HEAD (GND)
C
CP4002
AUDIO PB
6
5 AUDIO REC
B
4
CTL+
HEAD AUDIO
CONTROL
3 CTL-
2 AE HEAD(-)
1 AE HEAD(+)
A
CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE SYMBOL
REPLACE ONLY WITH PART NUMBERS SPECIFIED.

25" Main IC Block Diagram

3 4
X4001
3.579545MHz
NC
62 61 51 53
PULL
VX01
TIMMING DRIVER
L
85
H.SW
REC
H
FM-EQ
84
AGC KIL
AMP
83
C-LPF
H
P R
82
H.AMP
SW
GCA
88
L
R
P
FM
89
AGC
90
DELAY
H
PB
H.SW
FM-EQ
91 L
PB
DOUBLE
PHASE-EQ
LIM
7 REC AMP
5
6
AUTO BIAS
EQ
AMP
4
PB.EE
99 2 1
3 100
T4001
Q4005
5 BIAS CTL
2
6 3
Q4006
BIAS OSC P. CON + 5V
1
4
Q4001, Q4002 Q4003
AUDIO PB SW SW
.
5 6 7
Q4009
BUFFER
49
47
OUT
CCD CLAMP
NL
FM WC DETAL
EMPHA
MOD DC ENH
V/I
CONV
P P
Y-LPF
R R
YNR/
B-UP Main 3.58M
COMB
CONV BPF2
AMP
P N.L.
ACC
DEEM
AMP 3.58M
BPF1
R
NC1
KIL PB
B.D.
AMP
Y/C MIX
P
FM SUB
DEM LPF
R
V-AGC
P
R
LINE
ALC
AMP
MUTE
SYNC
SEP
42 38
96 98 97 80 76
2
J4201
2 3 Q4203
MUST SW
2
5-6 P/L = See parts list for part description
8 9
59
55
30
19
CLAMP 25
28
VCA 46
CLAMP
44
Q4008
36 EP SW.
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
Q4212 Q4210
INS.
BUFFER MUTE SW
Q4007
6dB
35 BUFFER
34 SW
Q4010
3
L4004
PROV = Provisional
10
SP/LP/EP-H
MICON/
INPUT_SEL
OPERATION/
DECK
TRICK_PB-H/EE-H
DOC_XO_CTL
REC/EE/PB
C. ROTARY
H. SW
VCR_A_MUTE MICON/
OPERATION/
V. REC_ST-H
DECK
ENV. DET
DUMMY_V. SYNC
EXT_MUTE
SD_VIDEO
TV
H. SYNC
TU_VIDEO
TU_AUDIO
TV
CHROMA_VIDEO
Y/C_AUDIO
MICON/
CTL+
OPERATION/
CTL-
DECK
TVBR2000 SHEET 6