Brother HL-2060 Service Manual page 88

I-3 Completely blank
Possible cause Step
EP-ED HC 1
cartridge
Development 2
input signal
error
Failure in power 3
supply terminal
LD failure 4
Failure in
development
high-voltage
circuit
I-4 All black
Possible cause Step
Beam detection 1
error
EP-ED HC 2
cartridge
Charging input 3
signal error
Dirt on power 4
supply terminal
Failure in the
charging high-
voltage circuit
LD failure
Check
Does printed image improve when the EP-ED
HC
cartridge is replaced?
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.
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?)
Does print quality improve when the laser
unit is improved?
Check
Is the printer hung up with the PRINT message
remaining on the display even after a printing
when only a copy is printed?
Does printed image improve when the EP-ED
HC
cartridge is replaced?
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.
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?
(is there continuity between them?)
Result
Result
VI-6
Remedy
Yes Replace the EP-ED HC
cartridge.
No Replace the main PCB
assy or the harness.
No Clean the terminal to
assure the continuity.
Yes Replace the laser unit or
the harness.
No Replace the high-voltage
power supply PCB assy.
Remedy
Yes Replace the laser unit or
the harness.
Yes Replace the EP-ED HC
cartridge.
No Replace the main PCB
assy or the harness.
No Clean the contact to
assure the continuity.
Yes Replace the high-voltage
power supply PCB assy
and, if the problem is not
resolved, replace the laser
unit or the harness.