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Polka dots
I-5
Possible cause
Step
Failure in static-
1
charge eliminator
Static-charge
2
eliminator
grounding failure
Dirt on the
3
transfer roller
Dirt on back of paper
I-6
Possible cause
Step
Dirt on the
1
PF guide
Open the toner cartridge lid in the printer, pull
2
out the EP-ED cartridge and remove the paper
-
in the printer. Is there already dirt on the back
of the sheet thus removed?
Dirt on the
Is there any dirt on the transfer roller?
3
transfer roller
Transfer input
Does the voltage at the 6 pin (HVT1) of the
4
signal error
connector P6 on the main PCB change from
9V to 0V for about 0.8 seconds?
Dirt on power
Clean the transfer roller right end bearing, the
5
supply terminal
check continuity between the transfer roller
power supply spring and the terminal of the
Failure in the
high-voltage transfer unit. Is there continuity?
transfer high-
voltage circuit
Dirt the fixing
6
guide
Are the upper and lower rollers of the fixing
7
Fixing roller
unit securely connected to the chassis via the
grounding failure
diode?
Fixing unit failure
Check
Is there any dirt on the static-charge eliminator?
Is there continuity between the static-charge
eliminator and the chassis?
Does print quality improve when the transfer
roller is replaced?
Check
Is there any dirt on the back of the paper feed
guide and the jam remove cover near the static-
charge eliminator?
Is there any dirt on the fixing unit inlet guide?
Result
Yes
Yes
Yes
Result
Yes
No
Yes
No
No
Yes
Yes
No
Yes
VI - 7
Remedy
Clean the static-charge
eliminator.
Ensure the grounding of the
static-charge eliminator.
Clean the transfer roller [Use dry
lint-free paper (producing little
paper dust) to clean the transfer
roller. Never use solvents] and,
if the dirt remains, replace the
transfer roller assy.
Remedy
Clean the PF guide or the
jam remove cover.
Go to Step 6.
Clean the transfer roller and,
if the dirt remains, replace
the transfer roller assy.
Replace the main PCB assy
or the harness.
Clean the contact to assure
the continuity.
Replace the high-voltage
power supply PCB assy.
Clean the fixing unit inlet
guide.
Ensure the grounding.
Replace the fixing unit.
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Troubleshooting
