Uneven Exposure Adjustment - Ricoh FT5580 Service Manual

12 June 1987

4. Uneven Exposure Adjustment

When
Purpose
Target
Measure
How
1. Clean the optics and the charge corona wires.
2. Place a test chart on the exposure glass and make three A3/LDG
copies.
3. I f t h e s i d e - t o - s i d e v a r i a t i o n s o f t h e g r a y s c a l e s i s n o t w i t h i n
specifications,
glass. (Refer to "Exposure Glass Removal.")
4. Position the adjusting plates [A] so that the copy image meets the
adjustment standard.
must be aligned [B] to avoid white streaks.
The exposure is uneven.
To maintain even exposure.
T h e s i d e - t o - s i d e v a r i a t i o n o f t h e g r a y s c a l e s o f t h e
test chart should be less than one level.
Exposure adjusting plate positioning.
T h e l i g h t i n t e n s i t y f r o m t h e e x p o s u r e l a m p i s m a d e
even across its length by changing the position of the
adjusting plates.
t u r n o f f t h e m a i n s w i t c h a n d r e m o v e t h e e x p o s u r e
The leading edges of the three adjusting plate
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