Service manual
Table Of Contents
- Revision Table
- Introduction
- Chapter 1
- Features and General Specifications
- Chapter 2
- Mechanism Configuration and Operating Principles
- Printer Mechanism Operating Principles
- Print mechanism unit
- Print head unit movement
- Wire movement when a single dot is printed
- Printing a character (9x9 font)
- Paper Feed Mechanism Unit
- Paper loading (semi-automatic loading)
- Paper feeding
- Ribbon Feed Mechanism Unit
- Ribbon feeding
- Detection Mechanism Unit
- Home position detection mechanism
- Paper detection mechanism
- Paper roll near-end detection mechanism (optional)
- Auto-cutter mechanism
- Ribbon Switch Mechanism Unit
- Electrical Circuitry Operating Principles
- Principles of Operation
- Printer Mechanism Driver Circuits
- Printer Mechanism Operating Principles
- Chapter 3
- Handling and Maintenance
- Chapter 4
- Troubleshooting
- Chapter 5
- Disassembly, Assembly, and Adjustment
- Small Part Specifications
- Disassembly
- Sub-assembly A
- Main Assembly 1
- Main Assembly 2
- Main Assembly 3
- Main Assembly 4
- Main Assembly 5
- Main Assembly 6
- Main Assembly 7
- Main Assembly 8
- Main Assembly 9
- Main Assembly 10
- Main Assembly 11
- Main Assembly 12
- Main Assembly 13
- Main assembly 14
- Main Assembly 15
- Main Assembly 16
- Main Assembly 17
- Main Assembly 1 (Case Unit)
- Main Assembly 2 (Case Unit)
- Main Assembly 3 (Case Unit)
- Main Assembly 4 (Case Unit)
- Main Assembly 5 (Case Unit)
- Main Assembly 6 (Case Unit)
- Main Assembly 7 (Case Unit)
- Main Assembly 8 (Case Unit)
- Main Assembly 9 (Case Unit)
- Main Assembly 10 (Case Unit)
- Main Assembly 11 (Case Unit)
- Main Assembly 12 (Case Unit)
- Adjustment
- Appendix
- Appendix
- Addendum 1
- Main Circuit Board Types and Maintenance
- Addendum 2
- Lower Plate Change and ROM Spacer Abolition
- Addendum 3
- Auto-Cutter Release Tab Change
Rev. B Mechanism Configuration and Operating Principles 2-27
TM-U200 Series (Type B) Service Manual
Confidential
Paper feed motor driver circuit
The paper feed motor (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, +24 V
(labeled +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.
Carriage motor driver circuit
The carriage motor (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, +24 V (labeled
+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 2-27 Paper feed motor driver circuit
Figure 2-28 Carriage motor driving circuit
RM2
87
65
43
21
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
87
65
43
21
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