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Service Guide OL830
Chapter 4 Failure & Repair Analysis
RAP 05: Engine Error - Fusing Problem Alarm
START
Turn the power OFF, then ON. Does a fuser unit alarm occur immediately?
NO Go to A
YES Is the thermistor open (the normal resistance should be about 100k ohms at room
temperature)? Measure between pins 1 and 2 of the cable connected to engine controller circuit
board J2.
YES Replace the fuser assembly.
NO Is the thermistor shorted? (See above)
YES Replace the fuser assembly.
NO Replace the engine controller circuit board.
END
A
Power OFF, then ON.
Does the fuser lamp glow? (Check this from the rear vents of the printer.)
YES Is the thermistor open? (See above)
NO Replace the engine controller circuit board.
YES Replace the fuser assembly.
NO Is the fuser lamp open? (With the upper cover open, lift the upper unit and measure
the
resistance between the heater AC connections.) (0 ohms is normal. Infinite resistance is
open.) Check for proper contact between the fusers AC contacts and the power supply.
YES Replace the fuser assembly.
NO Is the HEAT signal turned on? (HEAT signal at engine controller
circuit board IC3 pin 75.)
NO Replace the engine controller circuit board.
YES Replace the power supply unit.
END
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