CHAPTER 2. BASIC OPERATION
2–58
B. Paper Feed Motor Control
1. Outline
The paper feed motor (M1) is a 2-phase stepping motor. It controls the rotation of the paper
feed roller. The paper feed motor is controlled by the engine controller. Its major functions are
shown below. Figure 2-502 is a block diagram of the paper feed motor control circuit.
[1] Paper feed motor ON/OFF control
[2] Paper feed motor rotation direction control
[3] Paper feed motor rotation speed control
[4] Paper feed motor supply current control
Figure 2-502
2. Operation
a. ON/OFF control
The feed motor is switched ON and OFF by the paper feed motor driver control signal (MTP
4 to 7) issued by the CPU to the paper feed motor driver on the engine controller.
When MTP 4 to 7 are "0", the paper feed motor (M1) rotates when the paper feed motor
driver generates the motor drive pulses (XMA, XMAN, XMB, XMBN) from the paper feed
motor drive control signal (MTP 4 to 7) input from the CPU.
When MTP 4 to 7 are "1", no motor drive pulses are generated and the paper feed motor (M1)
stops rotating.
+26V
M1
Paper feed
motor
Paper
feed
motor
driver
Current
control
circuit
Engine controller
C P U
D/A 0
MTP 1
MTP 2
MTP 3
MTP 4
MTP 5
MTP 6
MTP 7
Vref 1
Vref 2
XMA
XMAN
XMB
XMBN
Summary of Contents for BJ-W3000
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