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TROUBLESHOOTING
COPY QUALITY TROUBLESHOOTING
6. TROUBLESHOOTING
6.1. COPY QUALITY TROUBLESHOOTING
If there is a copy quality problem that cannot be solved easily, try using the
following troubleshooting flow chart, while referring to the point-to-point dia-
gram. The flow chart may not be exhaustive, but it may help you to find the
problem.
Symptom: Blank copies
Check
1. Make a printer test (see
section 4-1-13). Is it OK?
2. Is the master installed cor-
rectly?
3. Does the master rotate
correctly during the copy
cycle?
4. Is the master grounded
properly?
5. Are any of the laser opti-
cal components broken,
blocked, or misaligned?
6. Are the transfer corona
unit and wire correctly in-
stalled?
7. Does the FCU output the
power and corona trigger
signal to the power pack?
8. Does the problem go
away if you change the
power pack?
9. Does the development
bias terminal reach the
correct voltage
(about -530 Vdc)?
10. Does the FCU output the
power and bias trigger
signal to the power pack?
11. Does the problem go
away if you change the
power pack?
12. Does the development
roller attract toner?
Action if Yes
There may be a scanner
problem; go to step 15.
Go to step 3.
Go to step 4.
Go to step 5.
Correct the problem.
Check the connections
between the corona wire
and the FCU. Go to step 7.
Clean the transfer corona
unit. Go to step 8.
Finished.
Go to step 12.
Clean the area around the
bias terminal. Go to step 11.
Finished.
Check all LDDR - FCU -
interlock switch
connections. Go to step 13.
6-1
1st August, 1994
Action if No
Go to step 2.
Install it properly.
Correct any problems with
the mechanism.
Check the grounding wire,
terminals and plates. Clean
or replace if necessary.
Go to step 6.
Correct the problem.
Change the FCU.
Go to step 9.
Go to step 10. Do not adjust
the variable resistors on the
power pack.
Change the FCU.
Clean the development
roller. Go to step 12.
Replace the roller.
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Troubleshooting
