OKIDATA OL400e Series, Service Manual

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Service Manual for OL400e/OL410e/OL410e-PS
Chapter 4 Failure & Repair Analysis
RAP 06: Fusing Unit Error (ERROR 71)
START
Power OFF the printer, then power ON the printer.
Does a fusing unit error occur immediately?
YES Is the resistance between the thermistor contacts correct?
It should read 220k ohms at room temperature.
YES Replace the fusing unit.
NO Does the thermistor contact touch the contact assembly properly when the
fusing unit is mounted in the printer?
NO Adjust the contact.
YES Replace the main controller board.
If the problem is not resolved, replace the power supply board.
NO Does the fusing unit error occur about 60 seconds after powering ON the printer?
NO Check the thermistor for poor contact.
If the problem is not resolved, replace the main controller board.
YES Power OFF the printer. Then, power ON the printer.
Is the lamp of the fusing unit ON? When the lamp is ON, light can be seen at
the fuser.
YES Replace the fusing unit.
If the problem is not resolved, replace the main controller board.
NO Is the fuser or thermistor open?
Measure the resistance between the fuser contacts. Normal resistance is about
zero Ohms.
YES Replace the fusing unit.