Canon D78-5311, Руководство по обслуживанию

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[B-Pedestal adjustment]
8. Connect an oscilloscope to test point "TP201B" (+) and chassis ground (-).
9. Select item no. "16" of group no. "3" and change data value to adjust the pedestal
level and black level to be same level.
2.5 NRS Adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER mode.
3. Connect an oscilloscope to test point "TP3551" (+) and chassis ground (-).
4. Enter the service mode and select item no. "7" of group no. "3" and change data value
to adjust it so that waveform "a" is 5.5 ± 0.1 V.
2.6 Signal Center Adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER mode.
3. Enter the service mode.
[R-signal center adjustment]
4. Connect the digital voltmeter to test point "TP25R1" (+) and chassis ground (-).
5. Select item no. "0" of group no. "3" and change data value to adjust it so that the
voltage value is 7.30 ± 0.05 V.
[G-signal center adjustment]
6. Connect the digital voltmeter to test point "TP25G1" (+) and chassis ground (-).
7. Select item no. "1" of group no. "3" and change data value to adjust it so that the
voltage value is 7.30 ± 0.05 V.
Part 3: Adjustment
3-11
(a)
Fig. 3-3
Pedestal level = Black level
(a)
Fig. 3-2