Error code C0500

Fuser Unit not heating up.

C0500: Warming-up Failure C0510: Abnormally Low Fusing Temperature C0520: Abnormally High Fusing Temperature Relevant Electrical Parts Fusing Roller Heater Lamp H1 Fusing Roller Thermistor TH1 Fusing Roller Thermostat TS1 Fusing Roller Heater Lamp Fuse TF1 Side Cover Interlock Switch 2 S3 Power Supply Unit 1 PU1 Master Board PWB-A
Step Check Item Result Action 1 Does H1 turn ON after the malfunction is reset? YES Check TH1 for contamination or installation. 2 Is there continuity across CN3-1 and 2 on the Fusing Unit end with CN3 (2P) disconnected? NO Check H1, TS1, and TF1 for continuity. 3 Is there continuity across 1A and 1B, and across 2A and 2B, of S3 when S3 is turned ON? NO Change S3. 4 Is the resistance of TH1 (across CN5-2 and 3 on the Fusing Unit end) infinity? YES Change TH1. 5 Is Fuse F2 on PU1 conducting? YES Change PU1 or PWB-A. NO Change the fuse. Step Check Item Result Action 1 Is TH1 installed properly? NO Install TH1 correctly. 2 Is TH1 dirty? YES Clean or change TH1. 3 Is the circuit across CN5-2 and 3 on the Fusing Unit end closed when CN5 (4P) is disconnected? YES Change