Brother 1270N - Manual (Page 142)

CHAPTER 6 TROUBLESHOOTING
6-20
M-5 Insufficient output from high-voltage power supply unit
Possible cause Step Check Result Remedy
High-voltage
contact 1 Do any of the terminals on the
high-voltage contacts have dirt
or contact burns? Yes Clean the terminals.
High-voltage
power supply
PCB 2 Check the connections of the
connector between the high-
voltage power supply and the
engine PCB are secured
correctly. Yes Replace the high-voltage
power supply PCB
No Reconnect the connector
between the high-voltage
power supply and the engine
PCB.
M-6 Fixing heater temperature failure
Possible cause Step Check Result Remedy
Poor thermistor
harness contact 1 Is the contact of connector P6
on the engine PCB good? No Reconnect the connector.
Blown thermal
fuse 2 Remove the fixing unit and
measure the resistance of the
thermistor. Is it open circuit? Yes Replace the fixing unit.
Thermistor
failure 3 Is the thermistor installed
properly? Yes Replace the fixing unit.
No Reinstall the thermistor
properly.
Halogen heater
lamp failure 4 Remove the fixing unit and
measure the resistance of the
halogen heater lamp. Is it
open circuit? Yes Replace the halogen heater
lamp.
M-7 BD failure
Possible cause Step Check Result Remedy
Harness
connection
failure 1 Is connector P10 on the main
PCB secured correctly? No Reconnect the connector
securely.
Yes Replace the laser unit.