VI-7
I-5 Polka dots
Possible cause Step Check Result Remedy
Failure in static-
charge
eliminator
1 Is there any dirt on the static-charge
eliminator?
Yes Clean the static-charge
eliminator.
Static-charge
eliminator
grounding
failure
2 Is there continuity between the static-charge
eliminator and the chassis?
Yes Ensure the grounding of
the static-charge
eliminator.
Dirt on the
transfer roller
3 Does print quality improve when the transfer
roller is replaced?
Yes 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.
I-6 Dirt on back of paper
Possible cause Step Check Result Remedy
Dirt on the
PF guide
1 Is there any dirt on the back of the paper feed
guide and the jam remove cover near the
static-charge eliminator?
Yes Clean the PF guide or the
jam remove cover.
2 Open the toner cartridge lid in the printer, pull
out the EP-ED HC cartridge and remove the
paper in the printer. Is there already dirt on
the back of the sheet thus removed?
No Go to Step 6.
Dirt on the
transfer roller
3 Is there any dirt on the transfer roller? Yes Clean the transfer roller
and, if the dirt remains,
replace the transfer roller
assy.
Transfer input
signal error
4 Does the voltage at the 6 pin (HVT1) of the
connector P6 on the main PCB change from
9V to 0V for about 0.8 seconds?
No Replace the main PCB
assy or the harness.
Dirt on power
supply terminal
5 Clean the transfer roller right end bearing, the
check continuity between the transfer roller
power supply spring and the terminal of the
No Clean the contact to
assure the continuity.
Failure in the
transfer high-
voltage circuit
high-voltage transfer unit. Is there continuity? Yes Replace the high-voltage
power supply PCB assy.
Dirt the fixing
guide
6 Is there any dirt on the fixing unit inlet guide? Yes Clean the fixing unit inlet
guide.
Fixing roller
grounding
7 Are the upper and lower rollers of the fixing
unit securely connected to the chassis via the
No Ensure the grounding.
failure
Fixing unit
failure
diode? Yes Replace the fixing unit.
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