2-26
Mechanism Configuration and Operating Principles
Rev.B
Motor, paper feed drive circuit
The Motor, paper feed (stepping motor) possesses an accurate angle of rotation and permits
speed control. It is driven with 2-2 phase excitation. By turning P53 of the CPU to Low, +24V
(+24C signal in the figure below) is applied to the COM terminal of its coil, and it is made to run
by changing P90, P91, P92 and P93 to High and Low. Its speed is determined by the speed of
changing P90, P91, P92 and P93 between High and Low. At the end of paper feeding, P53 of the
CPU is once again set to High.
Motor, carriage drive circuit
The Motor, carriage (stepping motor) possesses an accurate angle of rotation and permits speed
control. It is driven with 2-2 phase excitation. By turning P52 of the CPU to Low, +24V (+24B
signal in the figure below) is applied to the COM terminal of its coil, and it is made to run by
changing P20, P21, P22 and P23 to High and Low. Its speed is determined by the speed of
changing P20, P21, P22, and P23 between High and Low. At the end of paper feeding, P52 of the
CPU is once again set to High.
Figure 2-25 Motor, paper feed drive circuit
Figure 2-26 Motor, carriage driving circuit
RM2
8
7
6
5
4
3
2
1
Q18
9
7
5
3
8
6
4
2
1
1
0
QM4
1
2
3
1
2
3
CN6
4
5
4
5
Q20
Q19
Q21
PF A/DSW5
PF C/DSW7
PF B/DSW6
PF D/DSW8
PF A
PF C
PF COM
PF B
PF D
+24C
D10
(ROTOR)
+5V
+5V
+24C
U5
56
58
57
59
P90/M10
P92/M12
P91/M11
P93/M13
Paper feed motor
D35
D33
D34
D37
CR A/DSW1
CR C/DSW3
CR B/DSW2
CR D/DSW4
RM1
8
7
6
5
4
3
2
1
Q14
9
7
5
3
8
6
4
2
1
1
0
QM3
1
2
3
1
2
3
CN5
4
5
4
5
Q16
Q15
Q17
CR A
CR C
CR COM
CR B
CR D
+24B
D9
(ROTOR)
+5V
+24B
U5
52
54
53
55
P20/M00
P22/M02
P21/M01
P23/M03
Carriage motor
D29
D30
D31
D36
Summary of Contents for TM U200D - B/W Dot-matrix Printer
Page 2: ...technical manual TM U200D U200PD EPSON English 4005680 ...
Page 4: ...EPSON SEIKO EPSON CORPORATION Printed in Japan E9608130 0000SE ...
Page 145: ...Rev B Disassembly Assembly and Adjustment 5 49 TM U200D U200PD Technical Manual ...
Page 146: ...5 50 Disassembly Assembly and Adjustment Rev B ...
Page 147: ...Rev B Disassembly Assembly and Adjustment 5 51 TM U200D U200PD Technical Manual ...
Page 148: ...5 52 Disassembly Assembly and Adjustment Rev B ...
Page 154: ...Appendix A 6 Rev B Main Circuit Board A Parts Layout ...
Page 155: ...Rev B Appendix A 7 TM U200D U200PD Technical Manual Main Circuit Board C Parts Layout ...
Page 156: ...Appendix A 8 Rev B RS 232 Serial Interface Circuit Board Parts Layout ...
Page 169: ...Rev B A 21 TM U200D U200PD Technical Manual Case Unit Lubrication Points Diagram ...