VI-5
Possible cause Step Check Result Remedy
Development
input signal
error
10 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 laser unit or
the harness.
Dirt on power
supply terminal
11 Is there any dirt on the cartridge side
development terminal of the transfer unit and
on the terminal of the high-voltage power
No Clean the contacts to
assure the continuity.
Failure in the
development
high-voltage
circuit
supply development unit? (is there continuity
between them?)
Yes Replace the high-voltage
power supply PCB assy.
I-2 Dark
Possible cause Step Check Result Remedy
Density setting 1 Does printed image improve when density
setting is changed on the control panel?
Yes Adjust the proper setting
on the control panel.
EP-ED HC
cartridge
2 Does printed image improve when the EP-ED
HC cartridge is replaced?
Yes Replace the EP-ED HC
cartridge.
Dirt on the
grounding
terminal
3 Does printed image improve when continuity
is improved by cleaning the EP-ED HC
cartridge grounding terminal and the printer
unit grounding terminal?
Yes Clean the contacts to
assure the continuity.
Charging input
signal error
4 Do the pins 1, 2 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?
P6-1 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.
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.
Dirt on power
supply terminal
5 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 terminal to
assure the continuity.
Failure in the
charging high-
voltage circuit
(is there continuity between them?) Yes Replace the high-voltage
power supply PCB assy.
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