Drum And Drum Drive Section; Main Motor; Doctor Roller; Drum Master Clamper - Ricoh C231 Service Manual

DRUM AND DRUM DRIVE SECTION

4.1.3 DRUM AND DRUM DRIVE SECTION

1. Main Motor

When the motor pulley has been removed from the motor and then reinstalled, be
careful of the position of the pulley on the motor shaft. (See "6.9.8 Main Motor
Pulley Position Adjustment")

2. Doctor Roller

Normally the doctor roller gap is not adjusted or changed. It tends to be difficult to
adjust in the field. If the gap becomes narrower, an uneven image may appear on
the prints. If it becomes wider, too much ink will be applied to the drum screens,
resulting in ink leakage from the drum.

3. Drum Master Clamper

1) When installing the drum master clamper, be sure to position the two springs in
the drum master clamper correctly.
2) Do not allow the inside of the clamping plate to become dirty with ink.
3) Do not use alcohol or other solvents to clean the inside of the clamping plate.
Use a cloth dampened with water.

4. Ink Roller Unit

Do not disassemble the ink roller unit. Each part between the front and rear side
plates of this unit has been precisely adjusted on the production line to keep the
doctor and ink rollers parallel against the drum shaft.

5. Ink Pump

When the ink pump has been removed and reinstalled, be sure to adjust the
plunger position. (See "6.9.6 Ink Pump Removal and Plunger Position Adjustment")
When removing the ink pump, do not lose the small metal valve. When reinstalling
the pump, first set the valve on the joint side as shown, then install the ink pump on
the two joints. (See "6.9.6 Ink Pump Removal and Plunger Position Adjustment")
C231/C237/C238
4-2
SM