Ricoh M181-21 Field Service Manual page 196

6. Troubleshooting
SC204 C3
SC220 C4
194
The lock signal did not go HIGH (inactive) within 20 sec. after the
polygon motor turned off.
• Polygon motor I/F harness loose, broken, defective
• Motor driver board defective
• Motor defective
• Cycle the machine off/on
• Replace I/F harness
• Replace polygon motor
• Replace laser unit
D Polygon Motor Lock Signal Error
Four samplings within 200 ms revealed that the polygon motor lock signal
remained HIGH beyond the prescribed number of revolutions.
• I/F harness between the motor and driver board is loose, broken,
defective
• Driver board defective
• Motor defective
• Cycle the machine off/on
• Replace I/F harness
• Replace polygon motor
• Replace laser unit
D Beam Synchronization Error