Ricoh A151, Field Service Manual

Page: 59 / 397

1.4 OPTICS
1. The position of following parts are very difficult to adjust. Do not adjust
them.
a) 4th/5th Mirror Home Position Sensor
b) Lens Home Position Sensor
c) Lens and 4th/5th Mirror Guide Rails
NOTE: Before removing a sensor bracket to replace a sensor, mark the
position of the bracket. Check the copy image (magnification and
focus)to confirm that the sensor bracket has been properly
repositioned.
2. Clean the exposure glass with glass cleaner and a dry cloth to reduce
the amount of static electricity on the glass surface.
3. When reinstalling the exposure glass, make sure that the red mark on
the edge of the glass is positioned on the right hand side facing upward.
This side has received a special treatment to make it smoother and
generate less static electricity. This is especially important when the DF
is installed.
4. Clean the following parts with a dry cloth:
a) Lens and 4th/5th Mirror Guide Rails
b) Scanner Guide Plates
5. Only use a clean soft cloth damped with alcohol or water to clean the
mirrors and lens.
6. Do not touch the following parts with your bare hands:
a) Reflectors
b) Exposure Lamp
c) Mirrors and Lens
7. Whenever one of the actions listed below needs to be performed, all the
following actions must be done in order.
a) Optics cleaning
b) SP95 (V
L
Correction Reset)
c) SP48 (Light Intensity Adjustment)
d) SP56 (ADS Reference Voltage Adjustment)
8. Do not adjust VR401 on the AC drive board.
SER
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FSM 4-3 A151/A152