Dirty Background - Ricoh FT7770 Service Manual

Dirty Background

Note: When the problem occurs after the drum conditioning is
performed, make several white copies or cycle the
development unit for 2 minutes using SP 1-1.
Make
a reduction copy with A3/11" x 17" paper.
Does the dirty background appear in the erased areas?
N
Y
I
o Clean the
surfaces.
o Clean the
o Clean the
If the problem was not resolved, readjust the lamp
regulator outputs according to the FSM procedure.
Note: Make sure maximum voltage does not exceed 79 volts.
If the problem was not resolved, check and adjust the
charge corona current.
o Clean
the erase unit.
o Clean the drum heater thermistor
Do wavy lines occur with the dirty
Y N
I
Does the toner supply clutch turn off?
Y N
Is the toner supply clutch (CN301-A6) continuously
supplied with +24 volts?
Y
drum heater thermistor and bias thermistor
charge corona wire.
optics.
N
Clean or replace the toner supply clutch.
and bias thermistor surfaces.
background?
13-19
30 April, '89