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The primary transfer rollers engage back with the drums when the M5 is turned
counterclockwise and the cam pushes the holder up.
Figure 5-50.
Primary transfer roller engaging/disengaging control
NOTE
The opposite photosensitive drums (Y, M, and C) stop when the primary transfer rollers are
disengaged.
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.
172 Chapter 5 Theory of operation ENWW