Ricoh D124-17 Service Manual page 612

6. Troubleshooting
SC521-01
SC521-02
SC522-01
SC522-02
610
• Vertical wheel sensor connection loose, broken, defective
• Vertical motor connection loose, broken, defective
• Check motor to confirm that the polarity of the harness connector is
correct
• Check the sensor to confirm that the polarity of the harness connection is
correct
D Roll Unit 1 Communication Error
No response from DSP (Digital Signal Processing) that controls intermittent
feed from the paper rollers.
• Roll Unit 1 is not connected
• Cycle the machine off/on
• Check the harness connections between the roll unit and the MCU
• MCU defective
D Roll Unit 1 Hardware Error
DSP (Digital Signal Processing) responded with a hardware error.
• Roll paper feed motor harness loose, broken, defective
• Encoder sensor harness or encoder wheel loose, broken, defective
• Motor defective
• MCU defective
D Roll 2 Communication Error
No response from DSP (Digital Signal Processing) that controls intermittent
feed from the paper rollers.
• Cycle the machine off/on
• Check the harness connections between the roll unit, RFDB, MCU
• MCU or RFDB defective
D Roll 2 Hardware Error
DSP (Digital Signal Processing) responded with a hardware error.