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40930701TH DRAFT Vesion 148 /
4 Fuser unit error (ERROR 71), (ERROR 72), (ERROR 73)
• Turn the power OFF/ON.
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• Does a fuser unit error occur immediately?
• Yes Is the thermistor open or shorted?
Measure the resistance between thermistor contacts.
(About 220 kΩ at room temperature, 25°C)
(See Chapter 7.3 for the measuring points.)
• Yes Replace the fuser unit.
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• No Is a cable of the thermistor connected to "CN8" connector on the
Power Supply Unit (High Voltage)?
Is there any flaw on the cable of the thermistor ?
• No Adjust the thermistor contact so as to touch the contact assembly
properly.
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• Yes Does appear the heat-on signal at pin 6 (HEAT ON signal: 0 V in heater on
state) of the POWER connector on the Main board?
• No Replace the Main board.
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• Yes Replace the Power Supply Unit (High Voltage).
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• No Does a fuser unit error occur after more than 120 seconds from the power-on?
• No Go to
A
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• Yes Turn the power OFF/ON.
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• Is the heater of the fuser unit turned on? (When the heater is turned on, heat is radiated.)
• • Yes Is a cable of the thermistor connected to "CN8" connector on the
Power Supply Unit (High Voltage)?
• No Is a cable of the heater connected to "CN2" connector on "Power
Supply Unit" (120V or 230V)
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To on the next page
B
.
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To on the next page
A
.
A
B