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Manuals
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TRS-80
Service manual
Radio Shack TRS-80 Service Manual
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Also See for TRS-80
:
Reference manual
(274 pages)
,
User manual
(236 pages)
,
Service manual
(199 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Introduction
System Overview
Disassembly/Reassembly
Disassembly
Reassembly
Cpu Circuit Board
Technical Description
Video Sync Circuits
Processor
Ram
Address Decoding
Memory Map
10 Port Description
Video
Keyboard
Cassette Interface
Line Printer and Real Time Clock
10 Bus
Adjustments and Jumper Positions
Model 111 10 Bus Detailed Description
Model 111 PO RT Bits
CPU Module Parts List
Floppy Disk Interface
Technical Description
Control and Data Buffering
Non-Maskable Interrupt Logic
Drive Select Latch and Motor on Logic
Wait State Generation and WAITIMOUT Logic
Clock Generation Logic
Disk Bus Selector Logic
Read/Write Data Pulse Shaping Logic
Disk Bus Output Drives
Write Precompensation and Clock Recovery Logic
Floppy Disk Controller Chip
Adjustments and Jumper Options
Floppy Disk Interface PC Board Parts List
Vrs-232C Circuit Board
RS-232C Technical Description
Brg Programming Table
Pin-Out Description
Port and Bit Assignments
RS-232C PC Board Parts List
Power Supply
Functional Specifications
Troubleshooting
Set-Up Procedures
Visual Inspection
Section VI - Power Supply
Start-Up
No Output
Load Board Values
Performance Test
Voltage and Ripple Specifications
Power Supply Component Values
Video Monitor
Functional Specifications
Service Adjustments
Illustrated Parts Catalog
Illustrated Parts Catalog Parts List
Mini-Disk Drive
General Description
Introduction
Important Notice
Physical Description
Functional Description
Interface Connections
Physical Checkout
Mounting the Disk Drive
Resistor Termination
Flat Ribbon Cable Assembly
Theory of Operation
Introduction
Organization of the Disk Drive
Functional Block Diagram Description
Index Pulse
Write Protect
Track <.30 Switch
Spindle Drive
Positioner Control
Data Electronics
Data Recording
Data Reproduction
Operation
Interface Electronics Specifications
Input Control Lines
Select Lines (Ds1* - Ds4*)
Drive Motor Enable (MOTORON)
Direction and Step (DIR*) (STEP*)
Compensated Write Data (CWD)
Write Enable (WG*)
Track 00 (Trk0*)
Interface Connector Pin Assignments
Power Connector Pin Assignments
Side Select (Sdsel)
Output Status
Index Pulse (Ip*)
Write Protect (WPRT*)
Read Data (RD*)
Maintenance
Physical Description of the PC Boards
Circuit Board Test Points
Option Select
Input Line Terminations
Preventive Maintenance
Cleaning the Head
Alignment A~D Adjustment
Drive Motor Maintenance
Carriage Movement Check
Head Radial Alignment/Ce Alignment
Track <.30 Alignment
Index Sector Adjustment
Head Amplitude/Compliance Check
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1tad1e lhaeK
■
erv1ce
@Jffil[U]@J
TRS-BD®
MOD.
E Lm
MICROCOMPUTER
Catalog
Numbers
26-1061/1062/1063
I
.
CUSTOM
MANUFACTURED IN U.S.A. BY RADIO
SHACKMA
DIVISION
OF TANDY CORPORATION
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This manual is also suitable for:
26-1061
26-1062
26-1063
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