Sharp VL-PD1U

WL-PDI U
ADJUSTING THE VIDEO I/O CIRCUIT SYSTEM
(Wiring board diagram: Main Side B)
-TL1402
AGC
1. I/O Filter adjustment
I
\
TL1407
TL1408
PC0 D/A-C
PC0 D/A-C
Mode 1 Colour 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 “80”.
Examples l During E*PROM replacement.
2. PC0 D/A-Y adjustment
Test point
Mode
Procedure
Examples
TLI 408 (connected to oscilloscope)
EE mode for any given video signal
1)
2)
3)
Call the adjustment mode (V-ADJ).
Set the address to “22”, and call the date.
(100% white signal is output.)
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
-____ -.
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 1.28 Vp-p + 0.05.
1.28 + 0.05
l During E*PROM replacement l During IC4401 replacement. l During IC1401 replacement.
0 During circuit board (Main or Sub) replacement.
l During circuit boards (Main and Sub) replacement.
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