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1st August, 1994
Symptom: Blank copies
Check
13. Is the laser diode unit
screwed in properly?
14. Do the interlock switches
close when the cover is
closed, and do they pass
power to the LDDR?
15. Check the FCU - SBU
connection. Is there a
signal from the SBU
(AVIDEO)?
16. Does the problem only
occur when printing from
memory?
17. If the problem only occurs during communication, check the FCU - NCU - line
connections. Check for severe line problems. If the problem cannot be found, replace
the NCU or FCU.
Symptom: Black copies
Check
1. Make a printer test (see
section 4-1-13). Is it OK?
2. Are the charge corona
unit and wire correctly
installed?
3. Does the FCU output the
power and corona trigger
signal to the power pack?
4. Does the problem go
away if you change the
power pack?
5. Is the varistor shorted?
6. Is the master grounded
properly?
7. Does the development
bias terminal reach the
correct voltage
(about -530 Vdc)?
8. Does the FCU output the
power and bias trigger
signal to the power pack?
9. Does the problem go
away if you change the
power pack?
10. Check the connections
from the FCU to the
xenon lamp. Does the
lamp work?
COPY QUALITY TROUBLESHOOTING
Action if Yes
Go to step 14.
Change the LD unit, FCU,
master unit, or varistor.
Go to step 16.
Check the connection to the
memory card. Change the
memory card, FCU, or MBU.
Action if Yes
There may be a scanner
problem; go to step 10.
Check the connections
between the corona wire
and the FCU. Go to step 3.
Clean the charge corona
unit. Go to step 4.
Finished.
Change the varistor.
Go to step 7.
Go to step 10.
Clean the area around the
bias terminal. Go to step 9.
The laser beam may always
be on. Change the FCU or
LD unit.
Go to step 12.
6-2
TROUBLESHOOTING
Action if No
Install it properly.
Change them.
Light the xenon lamp. Align
the SBU (see section 5-2-9);
replace the FCU or SBU if
impossible.
Go to step 17.
Action if No
Go to step 2.
Correct the problem.
Change the FCU.
Go to step 5.
Go to step 6.
Check the grounding wire,
terminal and plate. Clean or
replace if necessary.
Go to step 8. Do not adjust
the variable resistors on the
power pack.
Change the FCU.
Clean the development
roller. Go to step 10.
Go to step 11.
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Troubleshooting
