Canon CLBP-460PS, Service Manual

Page: 118 / 566

e. Secondary transfer roller contact/separation control
Normally, the secondary transfer roller is detached from the intermediate transfer belt. This
operation presses paper against the intermediate transfer belt with the secondary transfer roller
at the time of secondary transfer. (See page 2-67 for details of secondary transfer.)
The DC controller sets the SECONDARY TRANSFER ROLLER CONTACT CLUTCH DRIVE sig-
nal (TR2CLON) to “L” and turns ON the CL4 at the specified timing. This timing is determined
based on the ITB HOME POSITION DETECTION signal (/ITBHP) detected right before the sec-
ondary transfer begins. When the CL4 is turned ON, the secondary transfer roller contact cam
pushes up the secondary transfer roller mount. This presses the secondary transfer roller
against the intermediate transfer belt with paper in between.
When the paper passes through the unit and the secondary transfer process completes, the
DC controller turns OFF the CL4 and separates the secondary transfer roller from the interme-
diate transfer belt.
Figure 2-4-16
2 - 60
CHAPTER 2
Intermediate transfer belt
Secondary transfer roller
Secondary transfer roller
contact cam
Secondary transfer roller mount
Print paper
CL4
Guide