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3.2 Troubleshooting Image Defects
Yes
Possible cause Step Check Result Remedy
1
Yes
2
I-1
Yes3
Yes
Light
4
No
5
9
Yes
Toner shortage
Replace EP-ED cartridge.
Adjust the proper setting
on the control panel.
During a printing, open the toner cartridge lid
in the printer and pull out the EP-ED cartridge.
Go to the Step 9.
Paper failure
Does the print quality improve when fresh
paper is used?
Use recommended paper.
Does printed image improve when printed
density setting is changed on the control
panel ?
Printing
density setting
Does printed image improve when the EP-ED
cartridge is replaced?
Transfer input
signal error
Do the pins 7 and 8 of the connector P6
on the main PCB have the following value
respectively when a sheet of paper is fed from
the MP tray?
P6-7 pin (HVT2) --- Change in voltage from
15V approx. to 0V about 1 second after paper
feeding.
P6-8 pin (HVT3) --- Change in voltage from
9V approx. to 0V just when the voltage at the
7 pin changes from 0V to 15V.
Replace the main PCB assy
or the harness.
Dirt on power
supply terminal
Failure in the
transfer high-
voltage circuit
Clean the transfer roller right end bearing, the
check continuity between the transfer roller
power supply spring and the terminal of the
high-voltage transfer unit. Is there continuity?
Clean the contact to assure
the continuity.
Replace the high-voltage
power supply assy.
Insufficient LD
light
Does print quality improve when the scanner
unit is improved?
Replace the scanner unit or
the harness.
Yes
-
7
8
6
No
ECONOMY
mode
Is the ECONOMY mode active?
Yes
Cancel the ECONOMY
mode.
Transfer roller
failure
Yes
Does the print quality improve when print is
made with transfer roller changed?
Clean the transfer roller [Use
dry lint-free paper (producing
little paper dust) to clean the
transfer roller. Never use
solvents] and, if dirts subsist,
replace the transfer roller assy.
Open the drum shutter of the EP-ED cartridge
and check the toner image on the drum.
Is the toner image before transfer is light?
Continued to the following page