V20 Chassis Technical Training
and Troubleshooting Guide
4-6
IC7A00 Microprocessor Outputs
PIN#
ABBREV.
DESCRIPTION
DESTINATION
10
CLR KILLER
Color Killer
Î
(JB-14)
Î
IC2M00-79
21
YS
OSD insert timing
Î
IC2V00-2
22
YM
Transparent gray bckgrnd.
Î
IC2V00-2
23
S480PSYNC
Sub Sync Switch Control
Î
(JB-6)
Î
IC2P00-9&IC2P01-9
24
M480PSYNC
Main Sync Switch Control
Î
(JB-8)
Î
IC2P00-10-11
25
SUB CONTRAST
Reduces Y amplitude (S-Contr-adj)
Î
Q2X31
27
ASIC RESET
Doubler Reset
Î
(EB-17)
32
R
OSD Red Signal
Î
IC2V00-6
33
G
OSD Green Signal
Î
IC2V00-5
36
B
OSD Blue Signal
Î
IC2V00-4
42
ENABLE CRT
Disables CRT Blanking circuit
Î
Q2W02
50
P-ON
Power On command
Î
(KE-14)
Î
(KH-6)
Î
Q9A51
52
ASIC CS
Doubler Chip Select
Î
(EB-19)
53
FON
Horizontal scan freq. Logic
Î
IC2V00-23
54
F1
Horizontal scan freq. Logic
Î
IC2V00-24
56
F31K
Adjusts Horiz DC Supply
Î
(KD-3)
Î
Q5A35&Q5A07
57
DEFL MUTE
Reduces Horiz DC during sweep changes
Î
(KD-4)
Î
Q5A08
74
VCHIP RST
V-Chip Reset
Î
IC2VO1-4
78
AUDIO RESET
Audio Reset
Î
IC3A01-16
79
3D RESET
3DYC Reset
Î
(JB-19)
Î
IC2MOO-57
80
MUTE SPKR
Speaker Mute
Î
(KD-19)
Î
IC3E01
81
ANT-A
Ant-A select
Î
Q7S02
83
SWCCDMAIN
Controls Main-Y selection, NTSC or COMP
Î
(JB-20)
Î
IC2P00-11
84
SWCCDSUB
Controls Sub-y selection NTSC or COMP
Î
(JB-21)
Î
IC2P00-10
85
VARIABLE
Selects Variable or Fixed Monitor Outputs
Î
(JB-17)
Î
IC3K00-3&IC3K01-3
86
MUTE MON.
Mutes Sound Monitor Outputs
Î
(JB-18)
Î
Q3K02
88
LED
Front Panel LED drive
Î
Q7C20
Î
(RF-1)
( ) = Connector
Table 2: Parallel Outputs
Summary of Contents for VS-50111
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