VI-6
I-3 Completely blank
Possible cause Step Check Result Remedy
EP-ED HC
cartridge
1 Does printed image improve when the EP-ED
HC
cartridge is replaced?
Yes Replace the EP-ED HC
cartridge.
Development
input signal
error
2 Do the pins 3, 4 and 5 of the connector?
P6 on the main PCB have the following value
respectively when a sheet of paper is fed from
the MP tray?
P6-3 pin (DBAC) --- Change in voltage from
6V approx. to 0V just when a sheet of paper is
fed from the registration unit.
P6-4 pin (DBDC) --- Change in voltage from
9V approx. to 0V just when a sheet of paper is
fed from the registration unit.
P6-5 pin (DNSTY) --- Change in voltage to
2.5V just when a sheet of paper is fed.
No Replace the main PCB
assy or the harness.
Failure in power
supply terminal
3 Is there any dirt on the cartridge side
development terminal of the transfer unit and
on the terminal of the high-voltage power
supply development unit? (is there continuity
between them?)
No Clean the terminal to
assure the continuity.
LD failure 4 Does print quality improve when the laser
unit is improved?
Yes Replace the laser unit or
the harness.
Failure in
development
high-voltage
circuit
No Replace the high-voltage
power supply PCB assy.
I-4 All black
Possible cause Step Check Result Remedy
Beam detection
error
1 Is the printer hung up with the PRINT message
remaining on the display even after a printing
when only a copy is printed?
Yes Replace the laser unit or
the harness.
EP-ED HC
cartridge
2 Does printed image improve when the EP-ED
HC
cartridge is replaced?
Yes Replace the EP-ED HC
cartridge.
Charging input
signal error
3 Do the pins 1 and 2 of the connector P6 on the
main PCB have the following value
respectively when a sheet of paper is fed from
the MP tray?
P6-1 pin (HV1AC) --- Change in voltage from
6V approx. to 0V just when a sheet of paper is fed.
P6-2 pin (HV1DC) --- Change in voltage from
9V approx. to 0V just when a sheet of paper is fed.
No Replace the main PCB
assy or the harness.
Dirt on power
supply terminal
4 Is there any dirt on the cartridge side charging
terminal of the transfer unit and on the terminal
of the high-voltage power supply charging unit?
No Clean the contact to
assure the continuity.
Failure in the
charging high-
voltage circuit
LD failure
(is there continuity between them?) Yes Replace the high-voltage
power supply PCB assy
and, if the problem is not
resolved, replace the laser
unit or the harness.
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