Symptom: Stray toner flecks fused into the copy
Check
Action if Yes
Action if No
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
Action if Yes
Action if No
1. Does the quenching lamp
operate correctly?
Clean or replace the master.
Check the connections
between the FCU and lamp.
Go to step 2.
2. Does the FCU send
constant power and drive
signals to the lamp?
Replace the quenching
lamp.
Replace the FCU.
Symptom: Density changes gradually across the printout
Check
Action if Yes
Action if No
1. Make a printer test (see
section 4-1-13). Is it OK?
There may be a scanner
problem; go to step 3.
Go to step 2.
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)?
Change the FCU.
Change the SBU.
Symptom: Uneven density in vertical bands
Check
Action if Yes
Action if No
1. Make a printer test (see
section 4-1-13). Is it OK?
There may be a scanner
problem; go to step 3.
Go to step 2.
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)?
Change the SBU.
Change the FCU.
T
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TROUBLESHOOTING
1st August, 1994
COPY QUALITY TROUBLESHOOTING
6-5