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Part 3: Adjustment
2.5 PSIG Adjustment
1. Input 1 Receive the 16-step gray scale computer signal in COMPUTER mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "TP2551" (+) and ground (–).
4. Select item no. "6" of group no. "5" and change data value to adjust it so that
waveform "a" is 3.8 ± 0.1 V.
5. Select item no. "8" and change data value to adjust it so that waveform "b" is 3.1 ±
0.1 V.
2.6 Black Level Adjustment
1. Input 1 Receive the 16-step gray scale computer signal in COMPUTER mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "TP531" (+) and ground (–).
4. Select item no. "4" of group no. "5" and change data value to adjust it so that
waveform amplitude "a" is 10.0 ± 0.1 V.
5. Connect the oscilloscope to test point "TP501" (+) and ground (–).
6. Select item no. "3" and change data value to adjust it so that waveform amplitude "a"
is 10.0 ± 0.1 V.
7. Connect the oscilloscope to test point "TP561" (+) and ground (–).
8. Select item no. "5" and change data value to adjust it so that waveform amplitude "a"
is 10.0 ± 0.1 V.
(b)
(a)
Fig. 3-4
black level
(a)
black level
Fig. 3-5
3-12
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