Brother HL-1070 Service Manual page 88

M-5
Possible cause
High-voltage
contact
M-6
Possible cause
SR bias contact
Ditto
M-7
Possible cause
Poor thermistor
harness contact
Blown thermal
fuse
Thermistor
failure
Halogen heater
lamp failure
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Insufficient output from high-voltage power supply unit
Step
1 Do any of the terminals on the
high-voltage contacts have dirt
or contact burns?
2 Check the connection of the
harness between the high-
voltage power supply and the
driver PCB is OK.
SR PCB failure
Step
1 Do any of the terminals on the
SR contacts have dirt or
contact burns?
2 Check the connection of the
harness between the SR PCB
and the driver PCB.
Fixing heater temperature failure
Step
1 Are the connectors on the
erase lamp PCB and the high-
voltage power supply PCB
secured correctly?
2 Remove the fixing unit and
measure the resistance
between the input connectors.
Is it open circuit?
3 Is the thermistor installed
properly?
4 Remove the fixing unit and
measure the resistance of the
fixing unit lamp. Is it open
circuit?
Check Result
Yes
Yes
No
Check Result
Yes
Yes
Check Result
No
Yes
Yes
No
Yes
IV-24
Remedy
Clean the high-voltage contact.
Replace the high-voltage
power supply PCB.
Reconnect the harness
between the high-voltage
power supply and the driver
PCB.
Remedy
Clean the SR bias contact.
Replace the SR PCB.
Remedy
Connect the connectors
securely.
Replace the fixing unit.
Replace the fixing unit.
Reinstall the thermistor
properly.
Replace the halogen heater
lamp.