Ricoh D124-17 Service Manual page 624

6. Troubleshooting
SC680-02
SC680-03
SC680-04
SC685
622
Correct startup of DSP (Digital Signal Processing) could not be confirmed after
three attempts. The CHOPIN module on the MCU handles the digital signal
processing (DSP) for the operation of the vertical feed motor (paper feed),
horizontal motor (carriage movement), and roll paper motor (roll units).
• Cycle the machine off/on
• MCU defective (replace MCU).
D DSP Initialization Error
Communication link between CPU and DSP could not be established because
DSP did not start up correctly.
• Cycle the machine off/on
• MCU defective
D DSP Communication Error
Communication between DSP and MCU was lost during machine operation.
• Cycle the machine off/on
• MCU defective
D PWM Control Error
PWM which controls operation of the motors locked at LOW or HIGH due to
damage to the FPGA IO terminal.
• Replace MCU
C Ink Collector Tank Communication Error
There was an error in communication with the ID Chip on the ink collector
tank. Five retries were attempted and failed.
• Tank ID data corrupted or chip damaged
• Spurious noise
• Cycle the machine off/on
• Remove the tank and set it again
• Switch the machine on
• If the problem persists, replace the ink collector tank