Service manual

IMAGE TRANSFER AND PAPER SEPARATION

G130/G131 6-56 SM

Transfer belt speed control

This machine uses two devices (Rotation encoder and transfer belt mark sensor) to

control the transfer belt speed.

Rotation Encoder

An encoder [C] is on one of the rollers. This encoder checks the rotation speed of

the transfer belt. The controller analyzes the signals from the encoder. Then it

adjusts the rotation speed of the transfer belt.

The encoder contains a disk that has 300 notches on its surface [B]. These

notches are read by the sensor [A]. The controller counts the number of notches

that the sensor has read in the unit of time. If the sensor has read an unusually

large number of notches or an unusually small number of notches, the controller

ignores such unusual signals. Therefore, incorrect reading does not affect the

rotation speed.

Filter H: The number of notches read by the sensor when the rotation speed of the transfer belt is

at its highest possible value.

Filter L: The number of notches read by the sensor when the rotation speed of the transfer belt is

at its lowest possible value.

G130D550.WMF

G130D584.WMF

[C]

Number of notches

(read by the sensor)

Time

Filter H

Filter L

Ignored

[A]

[B]