Ricoh G148, Service Manual

Page: 451 / 537

The drum motor [A] drives both the OPC drum and the cleaning unit. A flywheel [B] on the drum drive shaft
[C] reduces drum vibration. The other drive shaft [D] drives the cleaning unit. The drum drive shaft [C] drives
the drum at 362 mm/s.
Drum Charge
The charge power pack [A] provides an even negative charge to the two charge corona wires in the charge
corona unit [B]. (
 Photocopying Process> Charge> Corona Charge> Scorotron Method)
The PTL [C] makes better paper separation from the drum, and stops pick-off pawl marks on the leading
edges of copies. The PTL removes the charge at the leading edge when copying on plain paper or trans-
lucent paper. However, the PTL does not operate when copying with OHP, index sheets, or thick paper.
With SP2602 (PTL Setting), you can adjust the distance from the leading edge where the PTL turns on to
remove charge. There is an adjustment for the front side and one for the back side. For more, see section
“5. Service Tables, SP2602”.
6. Details
450
6