166 Theory of operation ENWW
Secondary transfer roller engaging/disengaging control
This controls the engagement of the secondary transfer roller with the ITB to transfer toner on the
ITB to the paper.
The DC controller drives the secondary transfer roller engaging solenoid (SL4) when the power is
turned on, a door is closed, and a print is completed.
The following is the sequence of this control.
1 The secondary transfer roller is disengaged from the ITB since the engaging cam is pressing
the engaging arm down.
2 The DC controller sends a SECONDARY TRANSFER ENGAGING SOLENOID DRIVE signal
and turns on the secondary transfer roller solenoid (SL4) for 0.5 second.
3 As the SL4 is turned on, the feeder motor (M1) drives the secondary transfer roller engaging
cam and rotates it.
4 As the cam rotates, the secondary transfer roller engaging arm goes up and pushes the
secondary transfer roller up.
The secondary transfer roller disengages from the ITB when the DC controller turns the SL4 again
for 0.5 second and rotates the cam a half turn.
Figure 5-50 Secondary transfer roller engaging/disengaging control
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