Minolta Di 620 Manual page 269

11) C0500 : Warming-up Failure
C0510 : Abnormally Low Fusing Temperature
C0520 : Abnormally High Fusing Temperature
C0540 : Fusing Roller Thermistor Loading Failure
C0550 : Hard Protect Detected
Upper Fusing Roller Heater Lamp H1
Lower Fusing Roller Heater Lamp H2
Upper Fusing Roller Thermistor TH1
Lower Fusing Roller Thermistor TH2
Upper Fusing Roller Thermal Fuse TF1
Lower Fusing Roller Thermal Fuse TF2
Upper Guide Plate Resistor R1
Lower Guide Plate Resistor R2
<Metric Areas>
Relevant Electrical Parts
Upper Fusing Heater Lamp SSR1 SSR1
Lower Fusing Heater Lamp SSR2 SSR2
Upper Fusing Heater Lamp SSR3 SSR3
Lower Fusing Heater Lamp SSR4 SSR4
Main Relay (RY1)
Master Board PWB-A
Power Supply Board PWB-C
T-54
1155C26TAB