Ricoh MP C6502SP Field Service Manual page 1419

Cause
Vibration of the cleaning unit synchronizes with the vibration generated by the gears that rotate the
Cleaning Brush Roller, creating a resonance.
This occurs specifically when the Cleaning Brush Roller rotates in the following 2 speeds, which are
defined as "Environment Coefficient 7 & 8" based on the absolute humidity detected internally by
the machine.
Operation mode
Environment Coefficient 7
Environment Coefficient 8
Reference
Environment Coefficient 1-3: Low temperature and low humidity
Environment Coefficient 4-6: Optimum machine operational condition (laboratory)
Environment Coefficient 7-10: High temperature and high humidity
Solution
Enter the SP mode and modify the environment coefficient set for Environment Coefficient 7 and 8
as shown below.
SP2-225-038
Environment Coefficient 7
SP2-225-039
Environment Coefficient 8
Absolute humidity
3
15-17.5 g/m 1.63 (default)
3
17.5-20 g/m 1.76 (default)
1.63 (default)
1.76 (default)
Cleaning brush roller rotation speed
coefficient
1.90
1.90
Image Quality
1417