Ricoh MP 7503SP Field Service Manual page 1298

7. Troubleshooting
SC543-00
SC544-00
SC545-00
1296
A Fusing lamp overheat error 1 (software)
The center thermistor (NC sensor) detected a temperature of 240°C at the
center of the hot roller. Fusing temperature control software error
• PSU defective
• IOB defective
• BICU defective
• Replace PSU
• Replace IOB
• Replace BICU
A Fusing lamp overheat error 1: Hardware
The center thermistor (NC sensor) or an end thermistor detected a
temperature of 250°C on the hot roller.
• PSU defective
• IOB defective
• BICU defective
• Replace PSU
• Replace IOB
• Replace BICU
A Fusing lamp overheat error 2: Center lamp
After the hot roller reached warm-up temperature, the fusing lamps
remained on at full capacity for 11 samplings (1.8 s. duration) while the hot
roller was not rotating.
• Thermistor damaged, or out of position
• Fusing lamp disconnected
• Pull the fusing unit out of the machine.
• Inspect all thermistor connections, harnesses.
• Inspect fusing lamp connections, harnesses.