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1st August, 1994
Symptom: Uneven density in horizontal bands
Check
1. Does the xenon lamp
flicker?
2. Is there a clear boundary
between the bands?
Symptom: Thin vertical white lines
Check
1. Make a printer test (see
section 4-1-13). Is it OK?
2. Clean the grid plate, toner metering blade, and laser optics.
Clean or replace the corona wires.
Add toner if the toner supply is getting low.
Check for foreign objects around the master that could cause leakage of charge form
the belt.
3. Is the surface of the hot
roller scratched?
4. Is the master scratched?
5. Clean the white pressure plate above the exposure glass.
6. Are there any peaks in the
SBU white waveform
(see section 5-2-9)?
Symptom: Fuzzy vertical white lines
Check
Clean or replace the corona wires.
Symptom: Wavy vertical black lines or bands
Check
The cleaning blade or toner metering blade may be dirty or damaged.
Replace the hexagonal mirror motor.
COPY QUALITY TROUBLESHOOTING
Action if Yes
Change the lamp.
Clean the charge and
transfer corona units (there
could be a leak, so check if
any Auto Service Calls were
made).
Action if Yes
There may be a scanner
problem; go to step 5.
Replace the component that
is damaging the hot roller,
then replace the hot roller.
If the hot roller strippers are
badly stained with toner,
replace them, and the
thermistor (or FCU or PSU).
Replace the component that
is doing the damage, then
replace the master.
Change the SBU.
Action if Yes
Action if Yes
6-6
TROUBLESHOOTING
Action if No
Go to step 2.
Clean the development unit,
its bearings, and drive
mechanism. or replace the
master unit and/or
development unit.
Action if No
Go to step 2.
Go to step 4.
Finished
Change the FCU.
Action if No
Action if No
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Troubleshooting
