Lexmark Optra S 4059 Series, Service Manual

Page: 77 / 347

Diagnostic Information
2-50
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
(Assembly includes
Thermistor and Thermal
Fuses.) Check for damage to the thermistor
assembly. Check the resistance of
the themistor:
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
approxi5 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 approxi5 V dc. If
incorrect, replace the fuser control
board.
3 Fuser Hot Roll
Backup Roll Bearings Examine the fuser assembly for
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.