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Manuals
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Radio Shack Manuals
Printer
Daisy Wheel 410
Service manual
Radio Shack Daisy Wheel 410 Service Manual
For trs-80
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Contents
Introduction
Specifications
General
Location of Components
Carriage Unit
Type Selector
Method of Type Selection
Up and down of Print Wheel
Joint Mechanism
Print Wheel Mounting
Type Selection Assembly
Print Motion
Joint Assembly
Hammer Mechanism
Ribbon Feed Mechanism
Frame Unit
Carriage Movement - Space Motion
Tension Example
Line Feed
Line Feed Assembly
Platen Release
Carriage Base Movement
Motors and Sensors
Magnet Drive
Location of Sensor for Selection Motor
Power Source and Power Source Monitoring
Power Source Specifications
Power Source Monitoring
Interface
Interface Configuration
Circuit Description
General Description
Printer Circuits
Block Diagram
Interface Control
Input/Output Pin Signals
Description of each Input Signal
Output Print Signals
Out of Paper
Busy
Ack
Interface Signal Pin Assignments
Input-Output Interface Timing Considerations
Input-Output Interface Timing Diagram
Printer Sequence Control
Selection Motor
Ordinary Motions
Clock Detection and Reset During Motion
Restore Motion
Monitoring of Restore Error
Space Motor
Clock Detection and Reset During Suspension of Motion
Restore Motions
Second Motion
Detection of Restore Error
Line Feed Motor
BLF Direction
LF Output Waveforms
Ribbon Feed Magnet
Hammer Magnet
Hammer Magnet Drive Times
Shift Magnet
Others
Shift Magnet Timing Diagram
Power Monitoring Timing Diagram
Motor and Magnet Drive
Selection/Space Servo Drive
Photo Sensors and Amplifiers
Exploded View of Sensor for Selection Motor
Outputs of Photo Sensing Elements
Output Waveforms of Photo Element
Motor Speed Change on Waveforms
Effects of Motor Rotation on Photo Sensor Waveforms
Amplification of Photo Sensor Output
Main Amplifier Waveforms
Compensation of Outputs
Temperature Compensation
Servo Motor Control
Example of Selection Motor Control
Speed Indicator X
Output X Waveform
Speed Variation y
Comparison of y Waveform
Combining of X and y
Combining of Forward and Backward Waveforms
Selection Motor Rotation
Selection Motor Drive
Feedback Pulses
Feedback Pulses Waveforms
Feedback Clock
Motor Stop
Motor Stop Circuit
Motor Stop Waveforms
Line Feed Drive
LF Drive Circuit
Output Waveforms
Ribbon Feed/Shift/Hammer Drive
Print Wheel Shift Drive
Hammer Drive
Hammer Magnet Circuit Waveforms
Voltage Monitor and Servo Hold
Voltage Monitor Circuit
Servo Hold Circuit
Major Integrated Circuits
Power Supply Unit
General Description of the Product
External Appearance
Dimensions and External Appearance of Universal Power Supply Unit
External Appearance of Control Board Assembly
Method of Switching of External Power Supply
Output Voltage
Output Voltage Rating
Output Terminal List
Output DC Power Sequence
Description of Circuit Operation
Filter Circuit
Rush Current Protective Circuit
Primary Side Rectifying and Smoothing Circuit
Primary Side Overcurrent Protective Circuit
Overcurrent Protective Circuit
Switching Power Circuit
Switching Operation
Secondary Side Rectifying and Smoothing Circuit
Overvoltage Protective Circuit
Pulse Length Control Circuit
Pin Arrangement
Stand-By DC Stabilizing Power Supply
Circuit Diagram
Replacement Procedures
Replacement of Carriage Assembly
Removal of the Carriage
Mounting the Cartridge
Checks after Replacement
Carriage Mounting
Replacement of Carriage Base
Removal of the Carriage Base
Mounting the Carriage Base
Carriage Base Mounting
Replacement of the Space Wire
Removal of the Space Wire
Mounting of the Space Wire
Space Wire Mounting
Replacement of the Control Board
Removal of the Control Board
Mounting the Control Board
Replacement of the Power Supply Unit
Removal of the Power Supply Unit
Mounting of Power Supply Unit
PSU Mounting
Replacement of the Space Motor
Removal of the Space Motor
Mounting of the Space Motor
Replacement of Line Feed Motor
Removal of Line Feed Motor
Mounting of the Line Feed Motor
Replacement of Hammer Assembly
Removal of Hammer Assembly
Mounting of Hammer Assembly
Adjustment Procedures
Adjustment of Platen Gap
Vertical Adjustment of the Carriage
Adjustment of Backlash of Line Feed Motor
Speed Adjustment of Selection and Space Motor
Adjustment Using SEL/SP Speed Tester
Adjustment Using Synchroscope
Troubleshooting
Faults at Power on Time
Faults in Operation
Printed Circuit Board
Wiring Diagram
Exploded Views
Parts List
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