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26-3803
Tandy 26-3803 Manuals
Manuals and User Guides for Tandy 26-3803. We have
1
Tandy 26-3803 manual available for free PDF download: Service Manual
Tandy 26-3803 Service Manual (110 pages)
Brand:
Tandy
| Category:
Laptop
| Size: 12 MB
Table of Contents
Table of Contents
3
Part I. Introduction
7
System Overview
8
External View
8
Internal View
11
Specifications
13
Part 11. Disassembly Instructions
15
Cases
15
Keyboard and LCD Pcbs
15
Main PCB
16
Part III. Maintenance
17
To Clean the Body and LCD Display
17
Part IV. Theory of Operation
19
General
19
Block Diagram
20
Cpu
21
Memory
21
I/O Map
23
Keyboard
24
Cassette Interface Circuit
25
Printer Interface Circuit
26
Bar Code Reader Interface Circuit
27
Buzzer Control Circuit
28
System Bus
29
Clock Control Circuit
30
Serial Interface Circuit
32
Lcd
39
Power Supply Circuit
42
Part V. Troubleshooting
45
General Guidance
45
Troubleshooting Guide
45
Check List
55
Part VI. Exploded View/Parts List
57
Electrical Parts List
58
Mechanical and Assembly Parts List
67
PCB Views
71
Appendix A/ Installation
75
Installation of Optional RAM and ROM
75
Assignments and Character Code Table
77
B-1. Keyboard Layout
77
B-2. Connector Pin Assignments
78
B-3. Character Code Table
83
Appendix C/Technical Information
89
C-1. 80C85A
89
C-2. 81 C55
95
Internal Register of 81 C55
97
Reading the C/S Register
99
Bit Assignments to the Timer Counter
99
Functional Block Diagram
101
Pin Configuration of 6402
101
Transmitter Operation
105
Start Bit Detection Timing
106
C-4. Basic Construction of LCD
107
Construction of LCD Panel
107
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