10.3 Operation; Pc Drum Drive Mechanism; Pc Drum Phase Control - Konica Minolta bizhub C250 Service Manual

10. Photo conductor section

10.3 Operation

10.3.1

PC drum drive mechanism

• Two independent PC drum motors (for color and monochrome) are used for the drive
mechanism to suppress incorrect color registration and uneven pitch.
• The color PC drum motor drives the PC drums/Y, M, and C, while the main motor drives
the PC drum/K.
• Drive is transmitted to each of the PC drums when the triangular-prism-shaped shaft is
engaged with the mating coupling part.
Color PC drum motor (M2)
Coupling
10.3.2

PC drum phase control

• Uneven eccentricity of the gears, a drive source of PC drums, causes unstable rotation of
the coupled PC drums. For phases control of PC drums, when the PC drums start rotat-
ing, change the rise timing between the color developing motor and the main motor to
adjust phase between both.
36
Main motor (M1)
Shaft
Theory of operation ver. 3.0 Aug. 2006