Main Unit Feed Motor Control Circuit - Printronix L5000 Series Maintenance Manual

Main Unit Feed Motor Control Circuit

The main unit feed motor is the motor that drives the transmission shaft that rotates
the transfer belt. It has the role of pulling the paper that is sent at the speed controlled
by the tractor motor or drum motor. Therefore, in cut–sheet mode, the rotation is
878.90625 rpm, the same as the drum motor driving the pre–drum roller. However, in
fan–fold paper mode, since paper tends to go slack near the perforation, the rotation
is set about 5% faster than that of the tractor motor or drum motor.
In order to realize this type of control, this machine has two types of rotary encoders,
20 pulse and 19 pulse. The CPU selects one of the encoders according to the mode
that has been selected, and sends the output signal to the PLL circuit.
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Electrical and Wire Data