Ricoh MP C6502SP Field Service Manual page 1424

5. Troubleshooting
3. If the problem does not resolve, replace the charge roller unit and execute DEMS
(SP3040-001).
Bands that appear in random pitch
1. Reset the PCDU and execute DEMS (SP3040-001).
2. Do the procedure: "Centering the axis of the Development roller" described on the next page.
3. Replace the charge roller unit and execute DEMS (SP3040-001).
4. Do the procedure: "Centering the axis of the Drum" described on the next page.
5. Replace the drum and execute DEMS (SP3040-001).
6. Replace the PCDU and execute DEMS (SP3040-001).
Centering the axis of the development roller
Ideally, the development roller and drum should revolve at the very center of the axis so that a
consistent gap is maintained between these components during the development process. This
however is not possible due to the margin of error.
To reduce the margin of error, center the axis of the development roller by fine adjusting the
engagement between the drive and coupling gears of the development roller.
1. Pull out the PCDU of the affected color.
2. Turn the coupling gear located at the rear side of the development unit 90 degrees
counterclockwise (viewed from rear).
3. Set the PCDU and execute DEMS (SP3040-001).
4. Print the test pattern and check the results.
5. Repeat the above steps, if improvement cannot be confirmed.
[A]: Joint of the development roller
[B]: Direction of rotation
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