Lexmark M410 Service Manual - Page 51

4045-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 1 Fuser Thermistor 2 Engine Board 3 Fuser Hot Roll Backup Roll Bearings Action Check for damage to the thermistor assembly. Check the resistance of the themistor: HOT - 1K ohms COLD =150K ohms to 475K ohms With the cable connected, check the continuity from J8-6 and J8-7 to ground. If there is continuity, replace the fuser thermistor. Error code 924 indicates the engine board detects an open circuit in the thermistor circuit for the fuser assembly. The voltage on J8-6 on the engine board measures approximately +5 V dc. If incorrect, replace the engine board. 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. Input Sensor Service Check Service Tip: Run the Base Sensor Test. Check the input sensor for proper operation. The display changes from open to closed as the sensor flag is manually moved in and out of the sensor. Diagnostic Information 2-25