Block Diagram - Zenith H19F34DT Series Service Manual

1 2
G
F
RF AGC
OUT 59
63
SAW VIF
IN
64
E IF IN
2
AFT
OUT
45
46
D
This schematic refers to
CH Chassis models
ACL/ABCL
H19F34DT
33
H20F34DT
H25F34DT
Y-SW OUT
H25F39DT
31
H27F34DT
C
H27F39DT
H25F36DT
H27F36DT
H32F36DT
B
A
SR25-3828VD0171B
3 4
62 61 60
DELAY ADJ VIF VCO ADJ
VCO
IF AGC
RF AGC VCO
ADJ
VIDEO
VIF
DET
AMP
APC
DET
AFT
DEFEAT
AFT OUT
NC
NC
VIDEO
MUTE
GAMMA
DET
REF
BLACK STRETCH VIDEO
ADJ FILTER
GAMMA
MUTE
BLACK
CLAMP
STRETCH
SHARPNESS
VIDEO
CHROMA
TONE TAKE OFF
BPF
DL
Y SW
TIME
DELAY
LPF
DL
TIME
ACC
SW
HPF
F. TRAP
LPF
CHROMA
TRAP
X2
38
41
CLOCK
CONTROL
TV IN/Y IN
EXT IN/C IN
1Vp-p
1Vp-p
CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER ìXî IN TH EIR
COMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.

Block Diagram

5 6
11V
VIDEO
OUT
MCU V
DD
1.2Vp-p
5V
8.7V
RESET
to MCU
30
55 58 42 32 47 49
5.7V
8.7V
RESET
5.7Vreg
POWER ON
US/JPN
CONTROL
P-ON-ON
LOCK
WHITE
DET
BLUE
BACK
COLOR
BRIGHT
DEMODULATOR
RGB
MATRIX BRIGHT
CONTRAST
TINT ANGLE
CONTRAST
KILLER
DET
KILLERB
HVCO ADJ
ACC
DET
CLK CONT
CHROMA
VCXO
APC
DET
VIDEO/CHROMA VIDEO/CHROMA
Vcc GND
37 39 40 29 35 36
25 34
3.58 MHz
5V
fsc
5V OUT 1
6-12
7 8
Vcc 8V
DIRECT OUT
5V
Vcc 5V
from MCU
INTER LIMITER
CARRIER IN
OUT
28 50 4 57 54
48 3 56 52
VIF Vcc
VIF GND
AF
FM
AMP
LIMITER DET
AUDIO SW
MUTE
FM
HPF
R EXT
INPUT
G EXT
INPUT
DRIVE B EXT
R B
INPUT
DRIVE HV
CLAMP
AMP
BLK
V SYNC
SYNC
TRIG G B
R
DEP
CUT OFF
SYNC
SLICE VERTICAL
EQ
ELIMINATE
COUNT DOWN
V. COINB V. SHIFT
BGP
NORIZONTAL
GEN
COUNT DOWN
H STOP
VCO
AFC GAIN
ADJ I I VCO
AFC 2
AFC I
I I
COINCI.
INV
Hi Vcc
H COINB
7
19
17 10 44
8 9
DEF
GND
FBP
INV
OUT
FBP
IN
ALL SYMBOLS WITH ìMî ON TH E DESIGNATOR
INDICATE SURFACE MOUNTED COMPONENT.
9 10
EXT AUDIO IN
53 43
ATT
AUDIO
51
ATT
OUT
26 SDA
BUS
I/F SCL
27
FAST BLK
24
R IN
23
G IN
22
21
B IN
R
14
OUT PUT
G
15
B
16
SERVICE SW
V. OUT
5
VERTICAL
V. RAMP
6
20
V. SIZE
V. PULSE
OUT
DY
1
Intelligent
Monitoring 18
Intelligent Monitoring
I I-pHASE
8V
NC
13
12
DEF
Vcc
11
H. OUT PUT