Ricoh A250 Service Manual page 290

SERVICE CALL CONDITIONS
SC502: 2nd Tray Lift Malfunction
SC503: 3rd Tray Lift Malfunction
Definition: [C]
The paper lift sensor is not activated after the tray lift motor has been on for 13
seconds.
Possible Causes:
• Tray upper lift sensor defective
• Tray lift motor defective
• Poor tray lift motor connection
• Too much load on the drive mechanism
SC506: Paper Tray Motor Lock (Optional Paper Tray Unit Only)
Definition: [C]
A motor lock signal is not detected for more than 1.5 s after the motor starts
rotation, or the lock signal is not detected for more than 1.0 s after the last lock
signal detection.
Possible Causes:
• Paper tray motor defective
• Too much load on the drive mechanism
SC542: Fusing Temperature Warm-up Error
Definition: [A]
After the main switch is turned on, the fusing temperature either does not reach
130°C within 50 seconds, or does not reach the printing temperature within 70
seconds.
Possible Causes:
• Fusing thermistor defective or out of position
• Fusing lamp open
• Fusing thermofuse open
• Power supply unit defective
• Poor connection of the fusing unit
SC543: Fusing Overheat Error
Definition: [A]
A fusing temperature of over 231°C is detected for 1 second by the fusing
thermistor.
Possible Causes:
• Fusing thermistor defective
• Power supply unit defective
A250 7-6 SM