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Adjustment procedures
[A/D pre-amplification circuit]
Adjustment purpose
1. ADC offset/gain
Symptom when
incorrectly adjusted
Measuring
---
instrument
Test point
---
EXT trigger
---
Measurement
---
range
Input signal
Shown in the table below
Input terminal
D-SUB input terminal
No.
Pattern
White/black signal
29
30
SMPTE (white)*
* Though the signal generator supplies
this signal as a green signal, the
projector receives it as Y/C
signal. Therefore, this signal is
projected as a full white SMPTE
signal.
To adjust the DC level and amplitude of the video signal at the time of
ADC input.
Solid black, solid white, or incorrect color phase appear in the projected
image.
* Enter the adjustment commands in capital alphanumeric letters.
1. Connect the projector with a personal computer running Microsoft
95/98/Me/XP operating system. (Refer to the figure on page 31.)
2. Start Microsoft
3. Start the communication program [Hyper Terminal] on Microsoft
95/98/Me/XP to open the Hyper Terminal window. (Refer to Hyper Terminal
Setting on page 32 for the settings.)
Offset adjustment with the RGB signal supplied
4. Supply an SVGA signal (White/black, No. 29).
5. Enter [00 ~ 5] (the command for RGB input clamp adjustment) on the Hyper
Terminal window, and the adjustment proceeds automatically.
6. When the adjustment finishes, the return command [00 ~ 5111] is displayed on
the Hyper Terminal window. The last three digits of the return command
indicate the adjustment results of R, G, and B respectively from the left by 1 or
0. When the adjustment has succeeded, 1 is displayed. When it has failed, 0
is displayed. Possible causes of failures in the adjustment are errors on the
/C
B
R
PCBs, wrong signals, and wrong input selection.
Offset adjustment with the component video signal supplied
7. Supply an NTSC signal (SMPTE (White), No. 30).
8. Enter [00 ~ AC1] (the command for video input clamp adjustment) on the Hyper
Terminal window, and the adjustment proceeds automatically.
9. When the adjustment finishes, the return command [00 ~ AC111] is displayed on
the Hyper Terminal window. The last two digits of the return command indicate
the adjustment results of C
the adjustment has succeeded, 1 is displayed. When it has failed, 0 is
displayed. Possible causes of failures in the adjustment are errors on the
PCBs, wrong signals, and wrong input selection.
Windows
95/98/Me/XP.
and C
respectively from the left by 1 or 0. When
R
B
DPX-530
Windows
Windows
33
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