Code :

Code: 923
Description: Fuser Error
Fuser is too hot during printing or when printer is idle.
Remedy: 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 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 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.

Code: 924
Description: Fuser Error
An open circuit has been detected in the Fuser Thermistor Circuit.
Remedy: 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 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 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.

Code: 925
Description: Fuser Error
Remedy: Wrong fuser lamp installed. Check the fuser lamp for the correct type of lamp that should be installed.

Code: 928
Description: Erase Lamps
Indicates that the engine has detected that either the erase lamp assembly is missing or disconnected.
Remedy: 1 Cable, Front Harness Check the connection of the front harness to connector J10 on the engine board for correct installation. If incorrect, repair as necessary. Check the front harness to erase lamp assembly for correct installation. If incorrect, repair as necessary. 2 Engine Board Remove the controller board and toner cartridge from the machine. Ground pin J10-15. The erase lamps turn on. The lamps can be observed through the front of the machine with the cover open and print cartridge removed. If the lamps do not turn on, measure the voltage on J10-14. The voltage reads approximately +24 V dc. If incorrect, replace the engine board. If correct, check the voltage at J10-15. The voltage reads between +15 V dc to +20 V dc. If incorrect, check the continuity of the erase lamp lines in the main harness. If incorrect, replace the cable harness. If correct, replace the erase lamp assembly.

Code: 929
Description: Toner Sensor
The toner sensor is not operating properly, the developer drive assembly is not operating properly or the print cartridge is defective.
Remedy: 1 Developer Drive Assembly Incorrect operation of the developer drive assembly can cause the printer to display a 929 error code (Toner Sensor). Check the developer drive assembly for correct installation, any sign of worn, loose or broken parts. 2 Toner Sensor Cable Check the toner sensor assembly cable to make sure it is properly seated into the toner sensor. If correct at both the sensor and engine board (J10), check the continuity of the cable. If incorrect, replace the cable. 3 Toner Sensor The toner sensor cable is part of the front harness and part of connector J10 on the engine board. Check the voltage at J1-011. It reads approximately +5 V dc. If incorrect, replace the engine board. If correct, check the voltage at J10-12. It reads approximately +5 V dc with the controller board removed from the printer. If incorrect, replace the engine board. If correct, replace the toner sensor assembly. A bad ground connection between J10-13 on the engine board and pin 3 on the toner sensor results in a 929 service error.

Code: 931
Description: Printhead: no first Hsync
These errors represent a problem with the printhead.
Remedy: 1 Error Code 931 No first HYSNC Signal Error Code 932 Lost HYSNC These errors usually indicate a failure in the HYSNC signal to the printhead. Check the continuity of the cables connected to J3 and J8 on the engine board. If incorrect, replace the defective cable. The voltage at J8-4 measures approximately +5 V dc. If incorrect, replace the engine board. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the printhead assembly. 2 Error Code 934 Mirror Motor Lost Lock Error Code 935 Mirror Motor unable to reach operating speed These error codes indicate a problem with the mirror motor circuit in the printhead assembly or the mirror motor cable to the engine board cable or engine board assembly. Check the continuity of the mirror motor cable connected to J3 on the engine board. If incorrect, replace the cable. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the FRUs in the following order: engine board printhead assembly

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