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Manuals
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Radio Shack Manuals
Printer
Daisy Wheel 410
Service manual
Table Of Contents - Radio Shack Daisy Wheel 410 Service Manual
For trs-80
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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Table of Contents
Contents
2
Introduction
3
Specifications
4
General
4
Location Of Components
7
Carriage Unit
8
Type Selector
8
Method Of Type Selection
8
Up And Down Of Print Wheel
9
Joint Mechanism
9
Print Wheel Mounting
9
Type Selection Assembly
9
Print Motion
10
Joint Assembly
10
Hammer Mechanism
10
Ribbon Feed Mechanism
11
Frame Unit
12
Carriage Movement - Space Motion
12
Tension Example
12
Line Feed
13
Line Feed Assembly
13
Platen Release
13
Carriage Base Movement
14
Motors And Sensors
15
Magnet Drive
15
Location Of Sensor For Selection Motor
15
Power Source And Power Source Monitoring
16
Power Source Specifications
16
Power Source Monitoring
16
Interface
17
Interface Configuration
17
Circuit Description
18
General Description
18
Printer Circuits
18
Block Diagram
19
Interface Control
20
Input/Output Pin Signals
20
Description Of Each Input Signal
20
Output Print Signals
21
Out Of Paper
21
Busy
21
Ack
21
Interface Signal Pin Assignments
22
Input-Output Interface Timing Considerations
23
Input-Output Interface Timing Diagram
23
Printer Sequence Control
24
Selection Motor
25
Ordinary Motions
25
Clock Detection And Reset During Motion
27
Restore Motion
29
Monitoring Of Restore Error
30
Space Motor
31
Clock Detection And Reset During Suspension Of Motion
34
Restore Motions
35
Second Motion
36
Detection Of Restore Error
37
Line Feed Motor
38
Blf Direction
38
Lf Output Waveforms
38
Ribbon Feed Magnet
38
Hammer Magnet
39
Hammer Magnet Drive Times
39
Shift Magnet
40
Others
40
Shift Magnet Timing Diagram
40
Power Monitoring Timing Diagram
40
Motor And Magnet Drive
41
Selection/Space Servo Drive
42
Photo Sensors And Amplifiers
42
Exploded View Of Sensor For Selection Motor
42
Outputs Of Photo Sensing Elements
43
Output Waveforms Of Photo Element
43
Motor Speed Change On Waveforms
43
Effects Of Motor Rotation On Photo Sensor Waveforms
44
Amplification Of Photo Sensor Output
44
Main Amplifier Waveforms
44
Compensation Of Outputs
45
Temperature Compensation
45
Servo Motor Control
46
Example Of Selection Motor Control
46
Speed Indicator X
47
Output X Waveform
47
Speed Variation Y
48
Comparison Of Y Waveform
48
Combining Of X And Y
49
Combining Of Forward And Backward Waveforms
49
Selection Motor Rotation
50
Selection Motor Drive
50
Feedback Pulses
51
Feedback Pulses Waveforms
51
Feedback Clock
51
Motor Stop
52
Motor Stop Circuit
52
Motor Stop Waveforms
52
Line Feed Drive
53
Lf Drive Circuit
53
Output Waveforms
53
Ribbon Feed/Shift/Hammer Drive
54
Print Wheel Shift Drive
54
Hammer Drive
55
Hammer Magnet Circuit Waveforms
55
Voltage Monitor And Servo Hold
56
Voltage Monitor Circuit
56
Servo Hold Circuit
56
Major Integrated Circuits
57
Power Supply Unit
62
General Description Of The Product
62
External Appearance
63
Dimensions And External Appearance Of Universal Power Supply Unit
63
External Appearance Of Control Board Assembly
63
Method Of Switching Of External Power Supply
64
Output Voltage
65
Output Voltage Rating
65
Output Terminal List
65
Output Dc Power Sequence
66
Description Of Circuit Operation
67
Filter Circuit
68
Rush Current Protective Circuit
68
Primary Side Rectifying And Smoothing Circuit
69
Primary Side Overcurrent Protective Circuit
69
Overcurrent Protective Circuit
69
Switching Power Circuit
70
Switching Operation
70
Secondary Side Rectifying And Smoothing Circuit
70
Overvoltage Protective Circuit
71
Pulse Length Control Circuit
72
Pin Arrangement
72
Stand-By Dc Stabilizing Power Supply
73
Circuit Diagram
74
Replacement Procedures
77
Replacement Of Carriage Assembly
77
Removal Of The Carriage
77
Mounting The Cartridge
78
Checks After Replacement
78
Carriage Mounting
78
Replacement Of Carriage Base
79
Removal Of The Carriage Base
79
Mounting The Carriage Base
80
Carriage Base Mounting
80
Replacement Of The Space Wire
81
Removal Of The Space Wire
81
Mounting Of The Space Wire
82
Space Wire Mounting
82
Replacement Of The Control Board
83
Removal Of The Control Board
83
Mounting The Control Board
84
Replacement Of The Power Supply Unit
85
Removal Of The Power Supply Unit
85
Mounting Of Power Supply Unit
86
Psu Mounting
86
Replacement Of The Space Motor
87
Removal Of The Space Motor
87
Mounting Of The Space Motor
87
Replacement Of Line Feed Motor
88
Removal Of Line Feed Motor
88
Mounting Of The Line Feed Motor
89
Replacement Of Hammer Assembly
90
Removal Of Hammer Assembly
90
Mounting Of Hammer Assembly
91
Adjustment Procedures
92
Adjustment Of Platen Gap
92
Vertical Adjustment Of The Carriage
93
Adjustment Of Backlash Of Line Feed Motor
94
Speed Adjustment Of Selection And Space Motor
95
Adjustment Using Sel/Sp Speed Tester
95
Adjustment Using Synchroscope
96
Troubleshooting
97
Faults At Power On Time
97
Faults In Operation
98
Printed Circuit Board
99
Wiring Diagram
107
Exploded Views
109
Parts List
109
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