Lexmark X644E Service Manual - Page 174

7002-xxx 924.xx-Hot fuser service check Error Code 923.xx, 924.xx, and 925.xx may display for a hot fuser failure. CAUTION The fuser may be hot, use caution before removing or servicing. CAUTION There is a danger from hazardous voltage in the area of the product where you are working. Unplug the product before you begin, or use caution if the product must receive power in order to perform the task. Service tip: Set the Fuser Temperature to NORMAL before starting this service check. In Diagnostics mode, In Diagnostics mode, select EP SETUP, and Fuser Temp. FRU Action 1 Fuser assembly Fuser to system board cable Check the thermistor cable for correct installation to J5 on the fuser card. If installed correctly, check for correct installation of J10 on the system board. If all cables are installed correctly, go to step 2. 2 Fuser top cover assembly Turn the printer off and disconnect the thermistor cable from J5 on (thermistor/thermistor cable the fuser board. Measure the resistance between the two pins on the assembly) thermistor cable, if the resistance measures infinity (open circuit), replace the fuser top cover assembly. 3 Fuser to system board cable. System board Fuser assembly Reconnect the thermistor cable to J5 on the fuser board. Disconnect the fuser to system board cable from J10 on the system board and measure the resistance between J10-3 and J10-4 on the cable. If the resistance measures infinity (open circuit) check the continuity of pins 3 and 4 of the cable. If correct, replace the fuser assembly. See "Fuser assembly removal" on page 4-79. If incorrect, replace the fuser to system board cable. Note: If the error code still displays, replace the system board. See "System board and inner shield removal -models X644e/ X646e" on page 4-131. 2-136 Service Manual