Canon GP160, Service Manual

Page: 57 / 797

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2 BASIC OPERATION
2-5
IV. MAIN MOTOR
1. Overview
The rotation and stopping of the main motor (M601) is controlled by the drive signal
output from DC controller PCB.
The DC controller PCB changes the speed in accordance with the print resolution.
2. Rotation operation
The unit’s main motor has a Hall element built-in 3 phase DC brushless motor, and
is integrated with the motor drive circuit.
When the main motor drive signal (MMD*) from the DC controller PCB is “0”, the
main motor begins to rotate, and when it reaches the designated rotation, the main
motor ready signal (MRDY*) signal changes to “0”.
The DC controller PCB’s CPU (IC301) judges that there is a motor malfunction when
the following situations occur, and displays the error code “##325”.
1) When the MRDY* does not change to “0” 100ms after the main motor’s drive has
started.
2) When the MRDY* signal has changed to “0”, but does not revert to “1” after 0.1s of
continuous rotation.
Figure 2-401
Drive
control
circuit
+24V
MMD*
J304-9
0V
-6 MRDY*
Driver
circuit
Rotation speed
detection
Reference
signal
generation
Main motor
(M601)
DC controller PCB
Main motor driver PCB
Related error code
###325: Main motor / exhaust fan malfunction
Related service mode
The print status is displayed by pressing TEST>6:FACULTY TEST>6-3:SENSOR> on
the input numeric key 7. Check the condition of the main motor malfunction using the
status 35 feeding unit malfunction detailed status Bit 6.