Fuser Unit Error (Error 71), (Error 72), (Error - OKIDATA OL1200 Service Manual

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Fuser unit error (ERROR 71), (ERROR 72), (ERROR 73)

Turn the power OFF/ON.
Does a fuser unit error occur immediately?
Yes
A
Yes
Yes
No Does a fuser unit error occur after more than 90 seconds from the power-on?
No
Yes Turn the power OFF/ON.
Is the heater of the fuser unit turned on? (When the heater is turned on, heat is radiated.)
B
To on the next flow.
To on the next flow.
From on the preceding flow.
Yes
Is the thermistor open or shorted?
Measure the resistance between thermistor contacts.
(About 220 kW at room temperature, 25°C)
(See chapter 7.3 for the measuring points.)
Yes Replace the fuser unit.
No Does the thermistor contact touch the contact assembly properly when
the fuser unit is mounted in the printer? (See Fig. 6-5.)
No Adjust the thermistor contact so as to touch the contact assembly
properly.
Does appear the heat-on signal at pin 31 (HEAT ON signal: 0 V in normal state) of
the Control board?
No Replace the Control board.
Replace the Power/sensor board.
Go to
Yes Does the thermistor contact touch the contact assembly properly when
the fuser unit is mounted in the printer? (See Fig. 6-5.)
No Adjust the thermistor contact so as to touch the contact assembly
properly.
Replace the fuser unit.
Service Guide OL1200
Chapter 6 Troubleshooting Procedures
Page: 107