Checks / troubleshooting:
1. Check error history from "Test7: Record" of self-
diagnosis function.
2. Set the number of endurance running cycles to 50 or
more from "Life: PF motor" of self-diagnosis function,
and check if "PF encoder error" occurs.
3. Check "Encoder: PF" from "Test5: Encoder" of self-
diagnosis function.
4. Is the area around PF encoder contaminated?
5. Check if MAIN Power Board normally supplies DC24V.
6. PF motor Assy may be damaged.
7. MAIN board Assy may be defective.