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TROUBLESHOOTING
COPY QUALITY TROUBLESHOOTING
Symptom: Stray toner flecks fused into the copy
Check
1. Clean the inside of the machine, especially around the development and transfer unit.
Clean the cleaning blade.
Clean the rollers in the fusing unit.
2. Replace the master unit or CTM.
Symptom: Previous copy shows faintly
Check
1. Does the quenching lamp
operate correctly?
2. Does the FCU send
constant power and drive
signals to the lamp?
Symptom: Density changes gradually across the printout
Check
1. Make a printer test (see
section 4-1-13). Is it OK?
2. Check that the charge corona wire is clean and that it is installed correctly.
Check that none of the laser optic components are out of position.
Check that toner is being distributed evenly across the development unit. If it is not,
change the CTM, development unit, or toner supply motor.
Try changing the master unit, quenching lamp, or the charge corona wire.
3. The xenon lamp may need to be changed.
4. Is the SBU scan line
alignment is correct (see
section 5-2-9)?
Symptom: Uneven density in vertical bands
Check
1. Make a printer test (see
section 4-1-13). Is it OK?
2. Clean or change the charge corona wire.
Clean or change the quenching lamp.
Clean the laser optic components with a blower brush or dry cloth.
Check that toner is being distributed evenly across the development unit. If it is not,
change the CTM, development unit, or toner supply motor.
3. Clean the exposure glass, white plate, and scanner optics.
Change the xenon lamp, especially if bands appear on the sides of copies made using
copy mode.
4. Are there any bands in
the SBU white waveform
(see section 5-2-9)?
Action if Yes
Action if Yes
Clean or replace the master.
Replace the quenching
lamp.
Action if Yes
There may be a scanner
problem; go to step 3.
Change the FCU.
Action if Yes
There may be a scanner
problem; go to step 3.
Change the SBU.
6-5
1st August, 1994
Action if No
Action if No
Check the connections
between the FCU and lamp.
Go to step 2.
Replace the FCU.
Action if No
Go to step 2.
Change the SBU.
Action if No
Go to step 2.
Change the FCU.
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Troubleshooting
