Mitsubishi S290U, Service Manual, Page: 10 / 190

Adjustment purpose [A/D Pre-Amplification Circuit]
2. A/D Convertor
Symptom when
incorrectly adjusted
Measuring
instrument
Test point
EXT trigger
Measurement
range
Input signal
Input terminal
To set amplitude of a video signal to be entered to A/D converter.
Monochrome picture has a color tint.
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SVGA signal
(White 100%, No. 01)
COMPUTER IN terminal
* This adjustment must follow item 1 (Clamp Level).
* Enter the adjustment command in small alphanumeric letters.
1. Connect this PROJECTOR to a personal computer (with Microsoft

Windows

95 Operating System). (Refer to the figure on P.1)
2. Start Microsoft

Windows

95 in the personal computer.
3. Start the communication program [Hyper Terminal] in Microsoft

Windows

95
to open the window. (For setting, refer to Hyper Terminal setting on P.2)
RGB
4. Supply an SVGA signal (White 100%, No. 01).
5. Enter [00~5] (A/D adjustment command) to the Hyper Terminal window and
automatic adjustment will start.
6. The return command [00~5111] is displayed on the Hyper Terminal Window
after the adjustment. The last 3 figures of the return command indicate the
result of adjustment and each figure corresponds to R, G, and B. in order. The
figure, 1 means that the adjustment has been successful. The figure, 0 means
that the adjustment has failed caused by faults on PCBs, wrong signals or
wrong input selection.
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