Specifications

9.2 UNEVEN EXPOSURE ADJUSTMENT
When: The exposure is uneven.
Purpose: To maintain even exposure.
Adjustment
Standard:
The side-to-side variation of the gray scales on
the test chart should be less than one level.
Measure: Move the exposure adjustment plates.
How: Changes the position of the adjustment plates to
make the light intensity from the exposure lamp
even across its length.
NOTE: Do not adjust the charge corona wire height to correct the uneven
image density on the copy.
When adjusting the wire height, use the drum shoe. (See Charge
Corona Current Adjustment.)
1. Clean the optics components and the charge corona wire.
2. Place a test chart on the expsure glass and make a A3/LDG copy.
3. If the side-to-side variations of the gray scales is not within the adjust-
ment standard, turn off the main switch and remove the exposure glass.
(See Exposure Glass Removal.)
4. Position the adjusting plates [A] so that the copy image meets the adjust-
ment standard. The leading edges of the three adjustment plates must be
aligned [B] to avoid white streaks.
[A]
[B]
1 December 1990
5-92