Lexmark manual 5016-001 921 Error codes

5016-001

920 and 921 Error codes.

	FRU	Action
1	Thermistor	Be sure the thermistor is clean and positioned
		properly. Check the following resistances of the
		thermistor:
		• Hot: (CN18-1 and CN18-2) (engine board)
		should be approximately 2.0 - 2.5 k ohms.
		• Cold: Should be approximately 150k to 250k
		ohms.
		If incorrect, replace the thermistor.
2	Engine Board	Check the HCU cable and fuser to engine board
	HCU Cable	cable, to be sure the contacts in the HCU cable
		(the autoconnect) are not bent or damaged.
		• If damaged, replace the HCU cable.
		• If the no damage is detected, be sure the
		cable is installed correctly at CN18 on the
		engine board. If the cable is good, replace the
		engine board.
		Error codes 923 and 924 may display for a hot
		fuser failure.

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