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1. Receive the 1 dot black & white pattern computer sig-
nal.
2. Set to COMPUTER mode.
3. Enter the service mode.
4. Project only green light component to the screen.
5. Select group no. “3”, item no. “8” and change data
value to obtain the minimum flicker on the screen.
6. Project only blue light component to the screen.
7. Select group no. “
3”, item no. “9” and change data
value to obtain the minimum flicker on the screen.
8. Project only red light component to the screen.
9. Select group no. “3”, item no. “10” and change data
value to obtain the minimum flicker on the screen.
Electrical Adjustments
. Common Center adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to COMPUTER mode.
3. Enter the service mode.
4. Connect an oscilloscope to test point “TP25R1”(+)
and chassis ground (-).
5. Select group no. “2”, item no. “3” and change data
value to adjust waveform “a” to be minimum ampli-
tude.
6. Connect an oscilloscope to test point “TP25G1”(+)
and chassis ground (-).
7. Select group no. “2”, item no. “4” and change data
value to adjust waveform “a” to be minimum ampli-
tude.
8. Connect an oscilloscope to test point “TP25B1”(+)
and chassis ground (-).
9. Select group no. “2”, item no. “5” and change data
value to adjust waveform “a” to be minimum ampli-
tude.
121m PC Gain adjustment
1. Receive the 16-step gray scale video signal.
2. Set to VIDEO mode.
3. Enter the service mode.
4. Connect an oscilloscope to test point “TP25R1”(+)
and chassis ground (-).
5. Select group no. “2”, item no. “3” and change data
value to adjust waveform “a” to be minimum ampli-
tude.
6. Connect an oscilloscope to test point “TP25G1”(+)
and chassis ground (-).
7. Select group no. “2”, item no. “4” and change data
value to adjust waveform “a” to be minimum ampli-
tude.
8. Connect an oscilloscope to test point “TP25B1”(+)
and chassis ground (-).
9. Select group no. “2”, item no. “5” and change data
value to adjust waveform “a” to be minimum ampli-
tude.
, AV Gain adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to COMPUTER mode.
3. Enter the service mode.
4. Connect an oscilloscope to test point “TP25R1”(+)
and chassis ground (-).
5. Select group no. “3”, item no. “11” and change data
value to adjust the waveform “a” (black portion ) to
be maximum amplitude.
6. Connect an oscilloscope to test point “TP25G1”(+)
and chassis ground (-).
7. Select group no. “3”, item no. “12” and change data
value to adjust the waveform “a” (black portion ) to
be maximum amplitude.
8. Connect an oscilloscope to test point “TP25B1”(+)
and chassis ground (-).
9. Select group no. “3”, item no. “13” and change data
value to adjust the waveform “a” (black portion ) to
be maximum amplitude.
