Develop QC 2235 Plus Service Manual page 68

Transfer Corona section
C. Retraction mechanism
• At the same time that the pressure position is changed, the Retraction Roller moves up
and down to change the position of the image transfer on the surface of the Transfer Belt
to suit the specific mode, either monochrome or color.
• Like the pressure position changing mechanism, the position at which the pressure cam
is stopped is changed to move the Retraction Lever, which results in the Retraction
Roller being moved up and down.
Retracted Position
Retraction Roller
Driven Roller
Monochrome Mode
D. Backup mechanism
• Since the Retraction Roller changes the belt path so that the Transfer Belt does not touch
the PC Drum/Y, M, C in the monochrome mode, the nip width between the Transfer Belt
and PC Drum/Bk at the 1st Image Transfer Roller/Bk will become smaller, thus resulting
in possible void images. To prevent this from occurring, there is Lifting Mylar installed
before the 1st Image Transfer Roller/Bk to help maintain a good nip width.
Retraction Roller
QC 2235plus Theory of Operation Ver.1.0 Feb. 2004
Cam Position C
4036ma2162c0
Retraction Lever
4036ma2165c0
Y M
Lifting Mylar
1st Image Transfer Roller/Bk
2-38
Color Mode
Transfer Belt
Lifting Mylar
C
Bk
4036ma2163c0
PC Drum/Bk
4036ma2164c0
4036ma2166c0