Ricoh FT4480 Field Service Manual page 214

2. UNEVEN DENSITY
IN BANDS.
- Possible Causes -
• Exposure lamp misaligned
• Dirty quenching lamp
• Dirty corona wire
• Incorrect corona current
- Action -
Does the darker area move with the image when making reduced copies?
Y N
I
• Clean the charge corona wire.
• Check and adjust the charge corona current. Make sure it is even
across the drum.
• Clean the quenching lamp.
• Clean the transfer corona wire.
• Clean the erase unit.
Are any of the following parts stained or dirty?
• T o n e r S h i e l d G l a s s
• Exposure Glass
• Mirrors, Lens, Reflectors
Y N
I
Is the exposure lamp stained?
Y N
I
Correct using the
exist?
Y
I
Align the filament
Replace the exposure
Clean them.
APPEARS
adjusting plates. Does the problem still
of the exposure lamp.
lamp.
9-9
15 March 1987