Pioneer PD-J900M Service Manual page 72

'PD-Z74T
As shown in Fig. 3-14, the second level gear of the main
cam and the clamp cam gear engage just before the
movements of tray I and tray II are completed, and the
clamp cam starts to rotate again. The right and left follow
gears face the non—toothed sections of the main cam, and at
the same time the rotation stops.
Main cam
Follow gear (left)
Tray Il
14