Ricoh Pro C901 Technical Bulletin page 257

Reissued:23-Feb-12
Model:
Aries-P1.5/C1.5
Cause
After shaping the GEAR:DEVELOPMENT ROLLER Z29, the plastic around the gear
shrinks. Refer to figure 1 below
The plastic around the gear breaks (refer to the red lines in figure 2) and creates a
backlash. Then, the development roller does not rotate uniformly, which creates the 8mm
pitch banding.
JOINT (Development Roller
Drive)
SHAFT:AUGER:COLLECT:JOINT
JOINT (Auger Drive)
GEAR:IDLER:Z31:ASS'Y
STEPPER
MOTOR:MM56:O/C
Figure 1: Layout of gears inside the drum drive unit
Plastic around the gear breaks
Broken Area
The bearing is pressure fit
Figure 2 Composition of GEAR : DEVELOPMENT ROLLER Z29
T
echnical
GEAR:DEVELOPMENT ROLLER:Z29:
Gear is created by Sintering
Blue area is plastic created by monolithic molding
Parallel Pin: Prevent the gear to rotate
The plastic physically contact the bearing
B
ulletin
Date:
23-Jan-12
GEAR:DEVELOPMENT
ROLLER:Z29
GEAR:IDLER:Z66:LOWER:ASS'Y
GEAR:IDLER:Z57:DEVELOPMENT:ASS'Y
GEAR:IDLER:Z66:LOWER:ASS'Y
COVER
PAGE: 2/9
No.:
RM077058a