Brother HL-820 Service Manual page 91

M-5 Insufficient output from high-voltage power supply unit
Possible cause Step
High-voltage 1
contact
High-voltage 2
power supply
PCB
M-6 Fixing heater temperature failure
Possible cause Step
Poor thermistor 1
harness contact
Blown thermal 2
fuse
Thermistor 3
failure
Halogen heater 4
lamp failure
M-7 BD failure
Possible cause Step
Harness 1
connection
failure
Check
Do any of the terminals on the
high-voltage contacts have dirt
or contact burns?
Check the connections of the
harness between the high-
voltage power supply and the
panel sensor PCB are secured
correctly.
Check
Are the connectors on the
erase lamp PCB and the high-
voltage power supply PCB
secured correctly?
Remove the fixing unit and
measure the resistance
between the input connectors.
Is it open circuit?
Is the thermistor installed
properly?
Remove the fixing unit and
measure the resistance of the
fixing unit lamp. Is it open
circuit?
Check
Is connector P2 on the panel
sensor PCB secured correctly?
IV-24
Result Remedy
Yes Clean the high-voltage contact.
Yes Replace the high-voltage
power supply PCB.
No Reconnect the harness
between the high-voltage
power supply and the panel
sensor PCB.
Result Remedy
No Connect the connectors
securely.
Yes Replace the fixing unit.
Yes Replace the fixing unit.
No Reinstall the thermistor
properly.
Yes Replace the halogen heater
lamp.
Result Remedy
No Connect it securely.