Lexmark 4059-XXX manual XXX Hot Fuser Service Check

4059-XXX

Hot Fuser Service Check

Error codes 923 and 924 may display for a hot fuser failure.

CAUTION: The fuser may be hot, use caution before removing or servicing.

	FRU	Action
1	Fuser Cover Assembly	Check for damage to the thermistor
	(Assembly includes	assembly. Check the resistance of
	Thermistor and Thermal	the themistor:
	Fuses.)	HOT - J2-1 to J2-2 = 2.5K ohms
		COLD =150K ohms to 260K ohms
		Check the continuity from each pin
		of J2 to ground. If there is continuity,
		replace the fuser cover assembly
2	Engine Board	Error code 924 indicates the engine
		board detects an open circuit in the
		thermistor circuit for the fuser
		assembly. The voltage on J2-6 on
		the engine board measures
		approximately +5 V dc. If incorrect,
		replace the engine board. If correct,
		check the continuity of the DC fuser
		cable connected between J2 on the
		engine board and J1 on the fuser
		control board. In there is no
		continuity, replace the cable. If there
		is continuity, check the voltage on
		J2-2 on the fuser control board. It
		measures approximately +5 V dc. If
		incorrect, replace the fuser control
		board.
3	Fuser Hot Roll	Examine the fuser assembly for
	Backup Roll Bearings	signs of overheating or damage.
		Check the hot roll and backup roll for
		signs of excessive toner, label glue,
		labels or other contaminants. If any
		are found, repair as necessary or
		replace the fuser assembly.

Diagnostic Information 2-50