HL-5130/5140/5150D/5170DN SERVICE MANUAL
6-21
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
CN7 on the engine PCB good?
No
Reconnect the connector.
Blown thermal
fuse
2
Remove the fixing unit and
measure the resistance of the
thermal fuse. 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
Laser Unit failure
Possible cause
Step
Check
Result
Remedy
Harness
connection
failure (1)
1
Is connector CN3:
5130/5140/5150D, or CN1:
5170DN on the main PCB
secured correctly?
No
Reconnect the connector
securely.
Yes
Replace the laser unit.
Harness
connection
failure (2)
2
Is the connection of the
scanner motor connector CN6
on the engine PCB secure?
No
Reconnect the connector
securely.
Yes
Replace the laser unit.