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VL-RDl U
ADJUSTING THE VIDEO l/O CIRCUIT SYSTEM
(Wiring board diagram: AV I/O Side A)
TLI 408
PC0 D/A-Y
TL; 407
PC0 D/A-C
1. I/O Filter adjustment
1
Mode
1 Color bar input
EEmode
Procedure
1) Call the adjustment mode (V-ADJ).
2) Set the address to "2D", and call the date.
3) Set the date to "8C".
Examples
l
During E*PROM replacement.
2. PC0 D/A-Y adjustment
Test point
TLI 408 (connected to oscilloscope)
Mode
EE mode for any given video signal
Procedure
Examples
1) Call the adjustment mode (V-ADJ).
2) Set the address to "22", and call the date.
(100% white signal is output.)
3) Vary the date with the FF and REW keys to set the signal appearing at TL1408 to 1 .OVp-p + 0.05.
___-___-___
U-I
1 .o & 0.05
_-B-B _.
l
During E*PROM replacement.
l
During IC4401 replacement.
l
During ICI401 replacement.
l
During circuit board (Main or Sub) replacement.
l
During circuit boards (Main and Sub) replacement.
3. PC0 D/A-C adiustment
Test point
Mode
Procedure
Examples
TLI 407
No input
1) Call the adjustment mode (V-ADJ).
2) Set the address to "23", and call the data.
.
3) Vary the data with the FF and REW keys to set the signal appearing at TL1407 to 1.34Vp-p & 0.05.
l
During E*PROM replacement.
l
During IC4401 replacement.
l
During ICI401 replacement.
l
During circuit board (Main or Sub) replacement.
l
During circuit boards (Main and Sub) replacement.
10-10
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