5.11.4. Adjustment
1. White Level
•
Fit the adjustment knobs [A] through the SBU slots as shown.
•
Loosen the SBU securing screws [B].
•
Remove any test charts that are on the exposure glass.
•
Ensure that the complete white level waveform can be seen on the oscil-
loscope.
•
Adjust the waveforms so that A and B in the oscilloscope display
meet the requirements.
•
Carefully tighten the SBU securing screws.
The waveform may have irregular patches if the lens, mirror, exposure
glass, white pressure plate, or CCD is dirty.
The xenon lamp may be wearing out if the waveform level is lower at the
ends than in the middle.
The CCD may be defective if the waveform has sharp peaks or dropouts.
H515R552.wmf
A
≤
1.26 V
B
≥
0.46 V
(A
-
B)/A
≤
0.3
[A]
[B]
H515R043.wmf
REPLACEMENT AND ADJUSTMENT
December 21st, 1995
SBU ADJUSTMENT
5-36
