Brother FAX-2820 Service Manual page 205

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 1
thermistor
harness
contact
Blown thermal 2
fuse
Blown 3
thermostat
Halogen 4
heater lamp
failure
M-7 Laser Unit failure
Possible cause Step
Harness 1
connection
failure (1)
Harness 2
connection
failure (2)
Check
Do any of the terminals on
the high-voltage contacts
have dirt or contact burns?
Check the connections of
the connector between the
high-voltage power supply
and the main PCB are
secured correctly?
Check
Is the contact of connector
CN19 on the main PCB
good?
Remove the fixing unit and
measure the resistance of
the thermal fuse. Is it open
circuit?
Remove the fixing unit and
measure the resistance of
the thermostat. Is it open
circuit?
Remove the fixing unit and
measure the resistance of
the halogen heater lamp. Is
it open circuit?
Check
Is connector CN6 on the
main PCB secured
correctly?
Is the connection of the
scanner motor connector
CN6 on the main PCB
secure?
9 -2 4
Result Remedy
Yes Clean the terminals.
Yes Replace the high-voltage power
supply PCB.
No Reconnect the connector
between the high-voltage power
supply and the main PCB.
Result Remedy
No Reconnect the connector.
Yes Replace the fixing unit.
Yes Replace the fixing unit.
Yes Replace the halogen heater
lamp.
Result Remedy
No Reconnect the connector
securely.
Yes Replace the laser unit.
No Reconnect the connector
securely.
Yes Replace the laser unit.
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