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I-11
Dropout
Possible cause
Step
Paper failure
1
Paper soaked
2
EP-ED cartridge
3
Transfer roller
4
failure
Transfer input
5
signal error
Dirt on power
6
supply terminal
Failure in the
transfer high-
voltage circuit
I-12
White vertical streaks
Possible cause
Step
Toner bias
1
Drum damage
2
Transfer roller
3
failure
Dirt on the
4
reflecting
mirror
Check
Is recommended paper used?
Is paper soaked?
Does printed image improve when the EP-ED
cartridge is replaced?
Is there any dirt on the transfer roller or is it
deformed?
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 a
sheet of paper is fed.
P6-8 pin (HVT3) --- Change in voltage from
9V approx. to 0V when the voltage at the
pin 7 changes from 0V to 15V.
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?
Check
Do white vertical stripes appear like a band?
Does print quality improve when the EP-ED
cartridge is replaced?
Is the transfer roller damaged or deformed?
Is the problem solved when the scanner unit
is replaced?
Result
No
Yes
Yes
Yes
No
No
Yes
Result
Yes
Yes
Yes
Yes
VI - 9
Remedy
Use recommended paper.
Store the paper in packing
paper to keep it from soaking.
Replace the EP-ED cartridge.
Clean or 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.
Remedy
Rock the cartridge, set it
again in the printer and
check again the print quality.
Replace the EP-ED cartridge.
Replace the transfer roller
assy.
Clean the reflecting mirror
with a cleaning tip or replace
the scanner unit.
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Chapters
Troubleshooting
