M-5 - Page 211

Confidential

9-23

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. 

Yes  Replace the high-voltage power 

supply PCB. 

High-voltage 
power supply 
PCB 

2 

Check the connections of 
the connector between the 
high-voltage power supply 
and the main PCB are 
secured correctly? 

No 

Reconnect the connector 
between the high-voltage power 
supply and the main PCB. 

M-6 

Fixing heater temperature failure 

Possible cause 

Step 

Check 

Result

Remedy 

Poor 
thermistor 
harness 
contact 

1 

Is the contact of connector 
CN19 on the main 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. 

Blown 
thermostat 

3 

Remove the fixing unit and 
measure the resistance of 
the thermostat.  Is it open 
circuit? 

Yes  Replace the fixing unit. 

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 

No 

Reconnect the connector 
securely. 

Harness 
connection 
failure (1) 

1 

Is connector CN6 on the 
main PCB secured 
correctly? 

Yes  Replace the laser unit. 

No 

Reconnect the connector 
securely. 

Harness 
connection 
failure (2) 

2 

Is the connection of the 
scanner motor connector 
CN6 on the main PCB 
secure? 

Yes  Replace the laser unit.