M4 (Fixing) Control - Minolta Di551 Service Manual

[4] M4 (Fixing) Control

5V
P.GND
MAINM CONT
MAINM CLK
MAINM F/R
MAINM EM
PRCB
24V2
P.GND
DCPS
M4 (fixing) is controlled by PRCB (printer control
board) and the motor drive power is supplied
from DCPS (DC power supply unit).
1. Operation
M4 (fixing) is a motor driven by 24 VDC. It drives
the fixing roller.
M4 starts rotating when the START button is
pressed and stops when the last copied paper
has been ejected.
During the warm-up operation, M4 rotates to
rotate the fixing roller.
M4
MS1 MS2
2-B-3
2. Signals
a. Input signal
(1) MAINM_EM (M4 to PRCB)
M4 (fixing) rotation error detection signal
[H]: Rotation error (when motor speed changes
by 6.5% more or less than the motor speed
specified value)
[L]: Normal rotation
b. Output signals
(1) MAINM_CONT (PRCB to M4)
M4 (fixing) ON/OFF control signal
[L]: M4 ON
[H]: M4 OFF
(2) MAINM_F/R (PRCB to M4)
M4 (fixing) rotational direction switchover signal
[L]:CW rotation
[H]:CCW rotation
(3) MAINM_EM (M4 to PRCB)
M4 (fixing) rotational speed control clock signal
DRIVE SECTION