Brother HL-1260 - Manual (Page 83)

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