Pc Drum Phase Control - Konica Minolta magicolor 8650 Service Manual

Theory of Operation Ver. 2.0 Nov. 2007
9.3.2

PC drum phase control

• The drive source of the PC drum/K is the transport motor.
• The drive source of the PC drums/Y, M, C is the PC motor. The three PC drum drive
gears/Y, M, C are connected by gears to each other and the PC drums/Y, M, C is always
in the same phase.
• The PC drum/K and the PC drums/Y, M, C use a different drive source to rotate them-
selves.
• Drive to the PC drums is provided by PC drum drive gears/Y, M, C and the PC drum drive
gear/K. If these eccentric gears can not synchronize with each other in their eccentric
rotation, rotational speed variations between the PC drums may happen. By synchroniz-
ing the eccentric rotation of the PC drum drive gears/Y, M, C with that of the PC drum
drive gear/K, rotational speed variations between the PC drums/Y, M, C and the PC
drum/K can be eliminated.
• The PC drum phase control system synchronizes the phase of all PC drum drive gears
by adjusting the rotation start timing of the drive gears/Y, M, C and the PC drum drive
gear/K when the PC drums start rotating.
• The phases of the gears are detected by Color PC drive sensor (Main/Sub) and the black
PC drive sensor (Main/Sub) which are located on the PC drum drive gear/C and PC
drum drive gear/ K, respectively.
* Back view
PC drum drive gear/K
Black PC drive
sub sensor
(PS30)
Black PC drive main sensor (PS29)
Color PC drive sub
sensor (PS28)
Color PC drive main sensor (PS27)
9. Photo conductor section
PC drum drive gear/C
A02ET2C524AA
29