Oki 10i, Maintenance Manual

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4 Fusing unit error (ERROR 71) (ERROR 72) (ERROR 73)
• Turn the power off, then back on again.
• Yes Is the thermistor open or shorted? Measure the resistance between thermistor contacts (heater
contacts 120V/3
Ω
or 240V/10
Ω
, and thermistor contacts 220K
Ω
at room temperature) (see
Figure 6-2 or Section 7.3).
• Yes Replace the fusing unit.
• No Do the thermistor contacts touch the contact assembly properly when the fusing unit is
mounted in the printer?
• No Adjust the contacts of the contact assembly.
• Yes Is the heater of the fusing unit turned on (when the heater is turned on, light is emitted)?
• Yes Check the thermistor contacts or replace the main control board or the fusing unit.
• No Is the AC voltage being supplied to the contacts for the heater of the contact assembly?
(see Figure 6-2)
• No Replace the main control board or the power supply/sensor board.
• Yes Check the heat contacts of the fusing unit and the contact assembly for poor contact
(see Figure 6-4 contact G ).
Heater contacts
Themistor contacts
Figure 6-2