Video Board Schematic - Zenith ZCM-1490 Service Manual

BLANK
CLAMP
BRIGHTNESS
CONTRAST
+8VDC
RSI24
180
CRSIOI
'-:h.
CS112
1
S.IV
~"'
0.01
I
1121.'
~
2SV _
~
1IIi---
10
+8VDC
, -_ _ _ _ _ _ _ _ _ TD CJIS203
CRS207
CR52U
...--_ ....... 1 - - ,
L..
RSII9
22k
QSIOI
fpI
~
RSI20 >---
27k RSI21
3.3k
-:.-
RSI26
2.7k
+8VDC
1
:k
CSI21
I
I0/2sV
QSI04
1P
+8VDC
\b
RSI62
30k k::J\
QSI02
CR5104
'------.t-..---it:=Y
.. R5130 R5131 + C5114
CUTlFf' P\LSES
TO QS304B
1.3k 2.7k 1 22
=-
-==- _
2SV
RSI33
3.3k
+8VDC
+88VDC
R5204
8i!
R520S RS206
C5122
I
RSI38 RSIS9 +SVDC 820 100
[!]
RSI23 +8VDC
IJ1
I I
ISO
~
RSI22 ICSIOI +8VDC
~
q.
1L...-+ ____ ---It . . . .
6_8"'kllr---=-19'-jr--- 16
1
RSI34
3.3k
0.01:::1::
1
470 100 QS2Q2
~
I
21.'
,rpI
QS203
2SV
K
QSI06 . (
N
ii;
1\:6.
R5215
- : -
~r
ON
CR- ..
RSIIS T CSII8 I + CSII9
III
RS112 Ik
I
1000pF
I
10/2SV
RS226 1 :X:::o 5201 CS208
J
27
R5135 QS10S 1.8k _
u ~
CR-
~..
0.01
i
RS216
3.3k
fP
RS139 _ CRS203' 5202
RS301
1M
.~ CRS301
CS301
4.7
+
100V RS302
220
~
220 2 _ 2SV
1211--
+8VDC CSIII
ok
' b
J
910
a.UE
QS201
LL---~-4H('-9rtr'"
27
RSI36 RSI37 R5140
GAIN IP
C5201 QS204 CR5304
~r
CR5310
+8VDC
+88VDC
RS319
Ik,1I2'W
~q.
lIo\l
+8VDC
RSI57'
f
22/2SV 1
10
W
RSII3
13 39k
470 1003 500
:~I\"""HIOOPF/50V
F'RIII -:-
t:l
470 RS202 RS203
~
R5318
_
~
RSI42 I
~ ~
Q5101E
4
i
68 68 Q5301 (
"H--'>----.:i ~
-:r
Aa.
10k RSIII
O~
______
~_8~.2~k __ ~ ______ ~~11
-16VDC CS119
I
R5158 10/16V:::I::
1
30k NP
R5114
IPROV
~
-=- -
fd.I
CUTtFT
=-
R5315
+88VDC
R5303
150.
1/2'"
COMP
R5317
r-~
CUTDFT
R5316
r-'~
CUTOFT
R5110
220
21.'
+-__ -+ ____
~..:.7-1
CR5107 C5109 CS108
I
~ S.IV,~
10 2200PF:::I::
1
+8VDC R5212
8 2 2! R5213 R5214 R5304
2.2k CR5307
1121.'
~
L
1"""
+8V
Q5304
~.J-t---+--f-------I-------
0.01 :::1::1 470 100 Q5206 K 2 ' " Q5207 130
25V
»
RS215 CS302
-==-
1/21.' I' 2SV 1 16V
12]1.1- - -
CUTOFT P\LSE
FROM IeSID2
C5101 R5109
47~~OV
22r!3
lII..UE
VIDEO
l!J
I - - - - - - - p - - - i
i
lR5101 tRSI04
RSI16
18 Ik
lji;
CSI23
I
R5145 RSI60
~SVDC
820 100,1141.' 1M
,~CR5302 ~
R5314
-K
QSI08
~[
;g '"
CR-
. ) R5227 1:X
~
520S C5208 27 ;.;
Q5107 1.8k _ u
~
CR-, 0.01 -, R5216 +
1-+---'--------'lMr------+-+----,
fP
R5146 _ CR5207' 5206
/.CO
100V R530S RS306
,----_-H 910 ,... , ...- 27 220 ISO, 1121.'
~
GREEN VIDEO
RED VIDEO
75 10k
.CS104
~~f:f.:~
~I-------'---l'
IL
22~i
L
R51021
~RS105
75 10k
C5105
-:- -:- 0.0068
r~
4
~S;~~: RSI~Cf
1II1---------.-l
22~9l8
75 10k
RS201
Ik
8.2pF/SOV
17
IS
R5117
Ik
CS213
100pF ISOV 1:':::
C5116
8.2pF/SOV
14
12
C5214j"
100pF/50V 1
R5118
lk
1
R51031:RSI06
C5106 CSI17
~
QS205
~
L
QS208~
COMP I 'ES303
RS143 RSI44 RSI47
~
CS20S
..J
CRS30S~.
CRS309
1
~
/
470 100 4 240 100pF F'RIII -
t:l
1- &
_
~
RSI49
~~
Q5101E
~
680
i
RS210 RS211
~
r:-------,-----J .
5 68 68 QS30S
~~
=- -=-
_ ) d J
R Fl.AT TECINLOGY CRT
R5209
Ik
=-
1
7
l
Cz)
IGI
G2 ... GAP~
+88VDC
+8VDC
RS220
820
21.' RS221 RS222 R5307
R5161 +SVDC 820 100,114'" 1M
100 QS210
~ ~'"
Q5211
QSIIO
° ii;
RS223 C5303 RS309
RS228 1
"' U N '0-
5209 C5212 27
4. 7
COMP
0.01
~
RS224
t--t--'--------+----------''VIIi-------'
I1ES302
1
C5124
I
R51S2
0.01:::1::
1
470
2SV
CRS303
.!
C5306::l::
ES301
0. 01
1
RS311
2.2k
COMP
"*
2kV
TDGl
DEFLECTiON
BOARD
RS310
2.2k
COMP
1
~.~~04
I
2kV
' - - -
TD G2
DEFLECTION
BOARD
- - 0.0068 9 8.2pF ISOV
R~~17
~~ ~~II-C-52-IS-~~~--~
100pF/50V 1
QSI09
K
!p
R5153
'-------.---t\-l\bo
910
R51S0
'470
RSISI R51S4
~ r
-
N
CR-.~,
ISO, 1/21.'
1.8k - ci
;~~O ~
ioov
R5308
- CRSJII
fP
27 220
RED
QS209
~
L
Q5212"!:::,
GAIN IP
CS209 CRS306 ,. CRS308
C5307
100pF
T
15kV
: ~. ~
100pF
F'RIIM-:!'-
RSIS6
~~
II518IE
470
~
RS218 R5219
6 68 68
- -:!,- -
QS303
tlJ+-4-__ ---'
)dJ
=-
--
IDO~
500
-=-
Figure 8-4. Video Board Schematic
Schematics and Waveforms
Page 8·7