Canon ImageRunner iR8500 Series, Service Manual, Page: 457 / 1122

Chapter 9
9-53
The position of paper is detected with reference to the start position and by finding out the difference between the start position and the actual paper position
from the number of drive pulses (1 pulse = about 0.16 mm) of the motor.
F-9-81
9.8.12 Controlling the Horizontal Registration Motor (M15)
0007-0541
iR105i/iR105+ / iR9070 / iR85+ / iR8070
Table shows the functions of the reversal motor control circuit, and the Figure is a block diagram of the circuit.
T-9-36
Item Description
Power supply 24 V is supplied by the no-stacking feeding driver PCB.
Drive signal Signal (SREGI_HOLD) from the DC controller PCB.
Operating/drive
assembly See Figure.
Control ON/OFF control
Rotation control
Stop position retention
Error detection Error code "E051"
Main power switch ON
Duplexing reversal
motor (M11)
Horizontal registration
motor (M15)
Horizontal registration
sensor (PS18)
Post-confluence
sensor (PS15)
Lower feeding middle
clutch (CL16)
Lower feeding rear
clutch (CL17)
: moves to the rear.
: moves to the front.
Home position
Start position
Start po 2 mm
Paper about 10 mm from the
registration sensor.
Start position
detection
Paper position detection
Paper position detection