Sanyo PLC-XF12N/NL Service Manual page 31

Electrical Adjustments
PSIG ADJUSTMENT
1. Receive the 16-step gray scale computer signal.
2. Set to COMPUTER mode.
3. Connect an oscilloscope to test point "TP581" (+) and
chassis ground (-).
4. Enter to the service mode, Select data no. "004" and
change data value to adjust "a" to be 0.5 ±0.1Vp-p.
5. Select data no. "003" and change data value to adjust
"b" to be 10.0 ±0.1Vp-p.
OFFSET ADJUSTMENT-[CG]
1. Receive the 16-step gray scale computer signal.
2. Set to COMPUTER mode.
[R-OFFSET ADJUSTMENT]
3. Connect an oscilloscope to test point "TP501" (+) and
chassis ground (-), "TP1501" (+) and chassis ground
(-).
4. Enter to the service mode, select data no. "17A" and
change data value as both of waveforms become the
same amplitude.
[G-OFFSET ADJUSTMENT]
5. Connect an oscilloscope to test point "TP531" (+) and
chassis ground (-), "TP1531" (+) and chassis ground
(-).
6. Select data no. "17B" and change data value as both
of waveforms become the same amplitude.
[B-OFFSET ADJUSTMENT]
7. Connect an oscilloscope to test point "TP561" (+) and
chassis ground (-), "TP1561" (+) and chassis ground
(-).
8. Select data no. "17C" and change data value as both
of waveforms become the same amplitude.
Waveform-A
PEDESTAL ADJUSTMENT-[CG]
Presetting
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
[R-PEDESTAL ADJUSTMENT-1]
3. Connect an oscilloscope to test point "TP501" (+) and
4. Enter to the service mode, select data no. "005" and
[G-PEDESTAL ADJUSTMENT-1]
5. Connect an oscilloscope to test point "TP531" (+) and
(a)
(b)
6. Select data no. "007" and change data value as the
[B-PEDESTAL ADJUSTMENT-1]
7. Connect an oscilloscope to test point "TP561" (+) and
8. Select data no. "009" and change data value as the
Waveform-B
-31-
chassis ground (-).
change data value as the pedestal and black level
become the same level.
chassis ground (-).
pedestal and black level become the same level.
chassis ground (-).
pedestal and black level become the same level.
Pedestal level = Black level