4. CB90 Paper Pushing Plate Motor Abnormality
CB90 refers to the pusher plate (part number: 4402353400 PLATE) on the saddle stitch and
there can be various causes.
Check the condition of the pusher plate (see Figure 3); it should be completely flat
with no kinks or bends in the lead edge 'castle' areas.
Clean and check the pusher plate home sensor (PI15S) – do not exchange sensors
in these finishers as they are not the same (see Figure 4). If you suspect the sensor
is at fault, order and fit the correct sensor.
Cam Assembly and Spring
Check the condition of the cam assembly and that the spring is still attached (see
Figure 4). Also ensure that the bushings on both sides of the pusher plate assembly
are in good condition and not elongated (see Figure 4).