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

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 ).

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