Sharp VL-SD20U - Adjusting the Video I;O Circuit System

VL-SD20U
ADJUSTING THE VIDEO I/O CIRCUIT SYSTEM
(Wiring board diagram: VIDEO l/O Side A)
1. PC0 D/A-Y adjustment
F
Test point
Mode
Procedure
TL6724 (connected to oscilloscope)
EE mode
1) Connect the AV cable and then connect it to the monitor (TO).
2) Call the adjustment mode (V-ADJ).
3) Set the address to “22”, and call the date.
(100% white signal is output.)
4) Vary the date with the FF and REW keys to set the signal appearing at TL6724 to 1 .OVp-p + 0.05.
IIIX
Examples l During E*PROM replacement. l During IC4401 replacement. l During IC1401 replacement.
A. 2. PC0 D/r
Test point
E
Mode
Procedure
-C adjustment
TL6725
EE mode
1) Connect the AV cable and then connect it to the monitor (TO).
2) Call the adjustment mode (V-ADJ).
3) Set the address to “23”, and call the data.
4) Vary the data with the FF and REW keys to set the signal appearing at TL6725 to 0.64Vp-p + 0.05.
0.64310.05
l----
Examples l During E2PROM replacement. l During IC4401 replacement. l During IC1401 replacement.
1 O-8