Ricoh FT7770 Service Manual page 536

30 April, '89
2. Uneven density appears
in bands.
Does the darker area move with the image
copies?
Y N
I
o Clean
o Check
Note :
o Check
o Clean
o Clean
o Clean
Are any of the following parts stained or dirty?
o Toner Shield Glass
o Brush Sea
o Exposure Glass
o Mirrors, Lens, Reflectors
Y N
Are the exposure lamps stained black?
Y N
I
If the uneven area match any of the lamp positions,
correct using the adjusting plates.
Note: The position of the adjusting plates is very
Replace the exposure lamp unit.
Clean them.
the charge corona wire.
and readjust the charge corona current.
Make sure it is even across the drum.
the charge ventilation fan, and correct it.
the quenching lamp filter.
the transfer corona wire.
the erase unit.
critical. Mark the original position before
moving them.
when making reduced
13-12