Brother HL-1070 - B/W Laser Printer, Руководство по обслуживанию

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IV-18
I-20 Horizontal lines
Possible cause Step Check Result Remedy
HV.GND
contacts
(Fig.4-5,
4-6)
SR electrode 1 Are the SR electrodes between
the printer body and the drum
unit dirty? Yes Clean both
electrodes.
➈
SR connection
failure 2 Are the SR electrodes between
the printer body and the drum
unit connected correctly? No Check the SR
connection.
Feed roller 3 Are the feed roller shaft and
the ground contact connected
correctly? No Check the
connection between
the shaft and the
ground contact.
➉
I-21 Light rain
Possible cause Step Check Result Remedy
Drum unit failure 1 Is the problem solved after
replacing the drum unit which
contains no more starter
sheet**? Yes Replace the drum unit.
SR PCB failure 2 Is the problem solved after
replacing the SR PCB? Yes Replace the SR PCB.
High-voltage
power supply
PCB failure 3 Is the problem solved after
replacing the High-voltage
power supply PCB? Yes Replace the High-voltage
power supply PCB.
**Note: Make sure to use the used drum unit which has already ejected the starter
sheet. It is not possible to find the drum unit failure if you use a new drum unit
with the starter sheet.
Note: Make the printer in the light rain test mode as follows before
checking;
1. Turn on the power switch and open the top cover.
2. Hold down the panel switch until all the lamps are on, and
then release the switch.