Sanyo PLC-EF12B, Service Manual

Page: 34 / 112

-34-
Electrical Adjustments
[B-VIDEO ADJUSTMENT-2]
11. Connect an oscilloscope to test point “TP2513” (+)
and chassis ground (-).
12. Select data no. “01C” and set data value to “3FF”.
13. Select Data no. “01B” and change data value to
adjust “a” to be 4.0 ±0.05Vp-p.
14. Select Data no. “01C” and change data value to
adjust “b” to be 2.1 ±0.05Vp-p.
(a)
(b)
black level
white level
white level
[CG WHITE BALANCE]
1. Receive the 16-step gray scale computer signal.
2. Set to COMPUTER mode.
3. Select data no. “014” (Red) or “016” (Blue), and
change data values respectively to make a proper
white balance.
Confirm the withe balance in VIDEO and COMPUTER
mode.
[AV WHITE BALANCE]
1. Receive the 16-step gray scale video signal.
2. Set to VIDEO mode.
3. Select data no. “01A” (Red) or “01C” (Blue), and
change data values respectively to make a proper
white balance.
Confirm the withe balance in VIDEO and COMPUTER
mode.
WHITE BALANCE ADJUSTMENT-[AV]
WHITE BALANCE ADJUSTMENT-[CG]
1. Receive the 1-line black/white computer signal.
2. Set to COMPUTER mode.
[R-COMMON CENTER ADJUSTMENT]
3. Project only red light component on the screen.
4. Select data no. “020” and change data value to obtain
the minimum flicker on the picture.
[G-COMMON CENTER ADJUSTMENT]
5. Project only green light component on the screen.
6. Select data no. “021” and change data value to obtain
the minimum flicker on the picture.
[B-COMMON CENTER ADJUSTMENT]
7. Project only blue light component on the screen.
8. Select data no. “022” and change data value to obtain
the minimum flicker on the picture.
COMMON CENTER ADJUSTMENT
1. Receive the 16-step gray scale video signal.
2. Set to VIDEO mode.
[R-OFFSET ADJUSTMENT]
3. Project only red light component on the screen.
4. Select data no. “023” and change data value to disap-
pear the vertical stripes on the screen.
[G-OFFSET ADJUSTMENT]
5. Project only green light component on the screen.
6. Select data no. “024” and change data value to disap-
pear the vertical stripes on the screen.
[B-OFFSET ADJUSTMENT]
7. Project only blue light component on the screen.
8. Select data no. “025” and change data value to disap-
pear the vertical stripes on the screen.
Project all lights and conform that the no vertical stripes
are observed on the screen.
OFFSET ADJUSTMENT-[AV]