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TROUBLESHOOTING
COPY QUALITY TROUBLESHOOTING
Symptom: Black copies
Check
11. Does the FCU output the
power and drive signals
to the lamp driver?
12. Check the FCU - SBU
connection. Is there a
signal from the SBU
(AVIDEO)?
13. Does the problem only
occur when printing from
memory?
14. 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: Faint copy
Check
1. Make a printer test (see
section 4-1-13). Is it OK?
2. Try the following steps (a to f) to solve the problem. If they fail, check the connections
through the machine between the FCU, toner near-end sensor, and toner supply motor.
Then go to step 3.
a) Replace the master.
b) If the Add Toner indicator is lit, add toner.
c) Clean or replace the corona wires.
d) Clean the toner metering blade (soft cloth and alcohol).
e) If the copy paper is damp, replace it.
f) If the toner contains dirt or paper particles, replace it.
3. Has the toner run out
even though the Add
Toner indicator is not lit?
4. Does the toner supply
motor turn just after the
main power is switched
on?
5. Work through steps 4 to 12 of "Blank copies".
6. Change the varistor, FCU, or LD unit .
7. Clean the exposure glass and the white plate in the scanner.
Symptom: Faint copy at leading or trailing edge
Check
The paper in the cassette may be curled at the leading edge
The paper in the cassette may be damp.
The paper may be too thick or too thin.
Instruct the user how to store paper, and instruct them to use recommended types and
weights of copy paper.
Action if Yes
Change the xenon lamp or
the drive board.
Go to step 13.
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 7.
Check the sensor actuator
mechanism. Change the
sensor if necessary.
Go to step 5.
Action if Yes
6-3
1st August, 1994
Action if No
Change the FCU.
Light the xenon lamp. Align
the SBU (see section 5-2-9);
replace the FCU or SBU if
impossible.
Go to step 14.
Action if No
Go to step 2.
Go to step 4.
Change the toner supply
motor or the FCU.
Action if No
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Troubleshooting
