4Fusing unit error (ERROR 71) (ERROR 72) (ERROR 73)

Turn the power off, then back on.

Does the fusing unit error occur immediately?

• Yes

Is the thermistor open or shorted?

 

Measure the resistance between

 

thermistor contacts (about 220kΩ at

 

room temperature) (see Fig. 6-2 or

 

see 7.3).

• Yes Replace the fusing unit.

Heater contacts

Themistor contacts

Figure 6-2

• No

Do the thermistor contacts touch the contact assembly properly when the

 

 

fusing unit is mounted in the printer (see Fig. 6-4 contact F )?

 

• No

Adjust the contact.

 

Replace the Main Control PCB or power supply board.

• Yes

 

 

• No

Does the fusing unit error occur about 60 seconds after the power is turned on?

• No

Check the thermistor for poor contact or replace the Main Control PCB.

Turn the power off, then back on.

• Yes

• Is the heater of the fusing unit turned on (when the heater is turned on, light is emitted)?

• Yes

Check thermistor contacts or replace the Main Control PCB or the fuser unit.

 

 

• No

Is the heater or the thermostat open?

 

Measure the resistance between the heater contacts (normal resistance: about 0Ω)

 

(see Fig. 6-2 or see 7.3).

• Yes

Replace the fusing unit.

 

 

• No

Is the AC voltage being supplied to the contacts for the heater of the contact assembly?

 

(Refer Fig. 6-2)

 

• No

Replace the Main Control PCB or the power supply board.

Check the heat contact of the fusing unit and the contact assembly for poor contact

• Yes

(see Fig. 6-4 contact G ).

6 - 34

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Image 134
Oki 6ex, 6E specifications Fusing unit is mounted in the printer see -4 contact F ?, Adjust the contact