Lexmark T522 Service Manual - Page 86

4520-xxx Hot Fuser Service Check Error Code 923: Indicates the fuser is too hot during printing or when the printer is idle. Error code 924: Indicates an open circuit has been detected in the fuser thermistor circuit. Note: Check the fuser sub error codes to help diagnose between a 923 and 924 error. CAUTION: The fuser may be hot, use caution before removing or servicing. FRU 1 Fuser Cover Assembly (Assembly includes Thermistor and Thermal Fuses.) 2 Fuser Control Board 3 Fuser to Engine Board DC Cable Action Check for damage to the thermistor assembly. If damage is found, replace the fuser top cover assembly. If no damage is found, check the resistance of the thermistor between pins J6-1 and J6-2 on the cable. • HOT = 2.5K ohms • COLD =150K ohms to 260K ohms If the resistance is incorrect, replace the fuser top cover assembly. If the resistance is correct, check each pin of J6 to ground. If there is continuity, replace the fuser cover assembly Check for continuity between J6-1 and J1-2 and between J6-2 and J1-3. If incorrect, replace the fuser control board. If correct, go to step 3. Check the continuity of the cable. If incorrect, replace the cable. If correct, go to step 4. 2-58 Service Manual