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1st August, 1994
Symptom: Part of the copy missing at the left or right edges
Check
1. Does the problem only
occur during copying?
2. Check the scanner optic path.
Change the SBU or FCU.
3. Check the laser optic path.
Change the FCU.
Symptom: Distorted printout
Check
1. Does the problem only
occur during copying?
2. Check that the document feed mechanism is operating smoothly.
3. Poorly installed or defective hexagonal mirror motor.
Blockage in the paper path.
Check that the main motor, gears, rollers, and drive belts are moving smoothly.
Symptom: Fuzzy copy
Check
1. Does the problem only
occur during copying?
2. Does the ozone fan turn
on?
3. Does the fan receive the
power and drive signals?
4. Change the ozone filter.
Check for obstructions between the transfer unit and the fusing unit.
Check that the master is grounded properly.
Change the master unit.
Clean or replace the corona wires.
Clean the laser optics carefully with a blower brush or soft dry cloth.
If the problem remains, go to step 5.
5. Does the development
bias terminal stay at a
constant voltage
(about -530 Vdc)?
6. Does the FCU output the
power and bias trigger
signal to the power pack?
7. Does the problem go
away if you change the
power pack?
8. Clean the scanner optics and the xenon lamp.
Check the SBU waveforms, especially MTF and reduction rate (section 5-2-9).
COPY QUALITY TROUBLESHOOTING
Action if Yes
Go to step 2.
Action if Yes
Go to step 2.
Action if Yes
Go to step 8.
Go to step 4.
Replace the fan.
Go to step 8.
Clean the area around the
bias terminal. Go to step 7.
Finished.
6-10
TROUBLESHOOTING
Action if No
Go to step 3.
Action if No
Go to step 3.
Action if No
Check the connections
between the ozone fan and
the FCU. Go to step 2.
Go to step 3.
Replace the FCU (or PSU).
Go to step 6. Do not adjust
the variable resistors on the
power pack.
Change the FCU.
Clean the development
roller.
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Troubleshooting
