Troubleshooting Image Defects - Brother HL HL-1060 Service Manual

3.2

Troubleshooting Image Defects

The following procedures should be followed in the event of specific image defects.
See subsection 3.3 for information about the location of the high-voltage contacts and
grounding contacts.
I-1 Light
Possible cause Step
Density dial
Toner sensing
failure
(printer side)
Toner sensing
failure
(toner cartridge
side)
Drum
connection
failure
High-voltage
power supply
PCB failure
Driver PCB or
main PCB failure
Scanner unit
failure
Check
1 Is the density dial in the center
of the click position?
2 Can printing be started with the
drum unit removed?
3 Is the problem solved when 4 or
5 pages are printed after the
toner cartridge is replaced with
a full one?
4 Is all the contacts (HV, GND)
connected with electrode when
the drum unit is installed?
5 Check the harness connection
between the high-voltage
power supply PCB and the
driver PCB.
6 Perform the same check as
step 5 above and also between
the driver PCB and the main
PCB.
7 Is the problem solved by
repealing the scanner unit?
CHAPTER IV -5
Result Remedy
No Set it to the center
detect position.
Yes Toner sensor failure.
Check if the toner
sensor needs
cleaning and check
the toner sensor
connection.
Yes The wiper of the toner
cartridge is defective.
Replace the toner
cartridge.
No Clean contact
electrodes both in the
printer body and on
the drum unit.
No If the connection is
normal, replace the
high-voltage power
supply PCB.
No Replace the driver
PCB or the main
PCB.
Yes Replace the scanner
unit.
HV.GND
contacts
(Fig.4-5)
c