Tandy 1400LT Manuals

Manuals and User Guides for Tandy 1400LT. We have 2 Tandy 1400LT manuals available for free PDF download: Service Manual, User Manual

Tandy 1400LT Service Manual

Tandy 1400LT Service Manual (301 pages)

Brand: Tandy | Category: Laptop | Size: 10.94 MB

Table of Contents

Table of Contents
2
Part 1 . Introduction
10
System Overview
11
External View
11
- Front View
  12
- Rear View
  12
Hardware Specifications
16
- DISASSEMBLY I NSTR Uctlo NS
  20
Case Screw Removal
20
- Lever Disengagement
  20
- Top Case Removal
  21
- Cable Removal
  21
Top Case
20
Battery Cover and Rear Cover
22
LCD Frame. Buttons. and LCD
22
- Battery Cover and Rear Cover Removal
  22
- Lever Spring Removal
  22
- Top Cover Removal
  23
- Exploded View of LCD Assembly
  24
- Cable Cover and LCD Removal
  24
LED PCB and Keyboard
25
Arm Assembly Removal
25
Battery Pack
26
Base Frame
26
- Battery Connector Removal
  26
Right Side of Base Frame
26
- Left Side of Base Frame
  27
Connector Locations
27
Fdd
28
- Power Switch Cord Removal
  28
- FDD Removal
  28
Power Source PCB. Power Source PCB Cover and Power Source PCB BOX
29
Contrast Knob
31
Speaker
31
Contrast Knob Removal
31
Speaker Removal
31
Main PCB. Keyboard Shield Plate. Rear Panel and Rear Panel Cover
32
- Exploded View of Main PCB Assembly
  32
Pedestals. Handle and Bottom Case
33
- Bottom Case Dismantling
  33
Battery Pack Replacement
34
Theory of Operation
38
General
38
Organization of Section
38
Block Diagram
39
IV-3. Description of Block Diagram
40
Cpu
40
IV-5. Clock Generator (Custom IC)
41
- Clock-Gen.1
  41
Clock-Gen.2
42
Clock-Gen.3
42
Clock-Gen.4
43
IV-6. Memory Map
44
Memory-Map
44
DIP-SW Location
44
IV-7. RAM Control Circuit
45
IV-8. Memory Card Specification
47
- Memory-Card
  47
IV-9. ROM Control Circuit
48
- ROM Address Decoder Circuit
  48
ROM and Peripheral Circuitry
48
I/O Address Map
49
IV-10. I/O Address Map
49
Clock Speed
50
- Interrupt
  52
- IV-12. Keyboard
  53
- External Keyboard
  53
KEYBOARD-2 (Internal Keyboard Character Codes)
62
KEYBOARD-4 (Enhanced Keyboard Character Codes)
68
KEYBOARD-5 (Numeric Lock States)
70
- Floppy Disk Drive
  71
  - DMA Control
    72
  - FDD Control
    73
- Cpu Interface for FDC
  73
- FDD Interface Circuitry
  74
- VFO and FDC Interface
  75
External FDD Connector Pin Assignments
76
- IV-15. Printer Interface
  77
- Printer Interface Circuit
  77
- Timing Diagram between CPU and Printer
  78
- IV-16. LCD Controller
  79
  - CPU Interface
    79
- LCDC-CPU Interface
  79
  - VRAM-CPU Interface
    80
- VRAM-LCDC Interface
  80
- VRAM-LCDC Timing Chart
  81
  - LCD Unit Interface
    82
- Interface Signal between LCDC and LCD Unit
  82
- LCD Interface Timing Diagram
  83
  - NTSC Composite and IRGB Interface
    84
- NTSC COMPOSITE Interface
  84
- IRGB Interface
  84
- NTSC COMPOSITE Interface Timing Diagram
  85
- IRGB Interface Timing Diagram
  86
- IV-17. Serial Interface
  87
- Serial Interface Block Diagram
  87
- Pin Layout Definitions of UART
  87
- Switching Logic (RS232C. MODEM)
  88
Baud Rate Generator (1.8432Mhz)
88
- RS232C Interface Circuit
  89
- Internal Modem Connector and Peripheral Circuitry
  89
- RTC and Peripheral Circuitry
  90
- IV-19. Speaker Circuit
  91
- Speaker Block Diagram
  91
- IV-20. Power Supply
  92
- EL Output Waveform
  92
  - Power Source
    93
  - Battery Voltage Warning
    93
  - Power Save Mode
    93
  - Output Voltage Circuit
    94
  - Output Voltage Circuit
    95
- Power PCB
  96
- Power PCB Circuit Diagram-2
  97
- Power PCB Circuit Diagram-3
  98
- IV-21. Option
  99
  - Expansion Bus
    99
Expansion 1/0 Connector
99
- Internal MODEM Connection
  101
Modem
101
Part V . Troubleshooting
110
- FDD Disassembly. Assembly and Parts
  146
- FDD Motor Spindle Parts Location
  148
- FDD PCB Control Parts Location
  149
- Parts List
  150
  - MAIN PCB Assembly
    150
Dip-Sw
152
- POWER PCB Assembly
  157
- SUB PCB Assembly
  160
- MEMORY PCB Assembly
  161
- LED PCB Assembly
  162
- LCD Unit Assembly
  163
- Fdd
  164
- Keyboard Unit Assembly
  171
- Circuit Diagrams
  176
- Main PCB Circuit Diagram
  176
Pcb Views
198
- VIII-1 MAIN PCB Views
  198
Main PCB
199
- Vlll-2 POWER PCB Views
  200
- Vlll-5 MEMORY PCB Views
  202
Appendices
203
- Lcd Specifications
  204
  - Appendix A . LCD SPECIFICATIONS
    204
  - Application
    204
  - Composition
    204
- Block Diagram
  204
  - Mechanical Specifications
    205
- Dot Dimensional Drawing
  205
  - Electrical Specifications
    206
- VO Adjusting Circuit
  207
- Timing Chart
  211
  - Optical Characteristics
    212
- Optical Characteristics Measurement System
  212
  - Definition of and
    213
- Definition of Contrast Ratio
  213
  - Operational Precautions
    215
- Operational Precautions
  216
- Unsoldering el Terminals (Bottom View
  218
- Detaching el (Right Side View
  218
- EL Removal
  219
- EL Insertion
  220
- Attaching el (Right Side View)
  221
- Soldering el Terminals
  221
- Functional Diagram
  224
  - Disk Chucking Mechanism
    226
- Interface Connections
  227
  - Recommended Circuit
    228
Input and Output Level
228
- Step Pulse Timing
  230
- Write Data Timing (MFM
  230
  - Write Gate and Write Data Timing
    231
- Index Signal Timing
  232
- Track 00 Signal Timing
  232
- Read Data Timing
  232
Timing of the Spindle Motor Rotation
235
Power Supply and Current
235
- VCC Detector
  236
- Cable Connections
  237
Signal Connector Pin Assignments
238
Mechanical Dimensions
239
- Recommended Mounting Direction
  240
- Mounting Angle
  240
- Cartridge Loading
  241
Allocation of the Track Format
243
Appendix D . 3.5 Inch FDD MAINTENACE
246
Tools and Measuring Instruments
246
Trouble Shooting
247
- Cat's Eye Pattern
  249
- Index Phase
  250
Parts Replacement
253
- Replacement
  253
- Front Panel Replacement
  254
- Carrier Replacement
  255
Adjustment
258
- Head Alignment
  258
- Index Alignment
  258
Appendix E . CHARACTER CODE TABLE
260

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Tandy 1400LT User Manual

Tandy 1400LT User Manual (86 pages)

1200 bps Modem

Brand: Tandy | Category: Modem | Size: 1.33 MB

Table of Contents

Table of Contents
5
Chapter 1 Introduction

9
- Make
  10
- Use Your
  10
- Easy to Use
  11
- Introduction
  11
- How
  11
- To Use
  11
Chapter 2

13
- Installation
  13
- Connecting Your
  13
- Telephone Line
  14
- Connecting Your
  14
- Installation
  15
- Auto Answer
  18
- Testing Your
  19
  - Testing Your Modern
    19
  - Testing the
    19
Chapter 4 Introduction to

25
- Direct Entry
  25
- Functional States
  25
- Changing of
  26
- Command
  29
- Speed of
  32
- Auto Answer
  39
  - Command
    40
- A - Answer
  41
- A/ - Repeat
  42
- C - Carrier Signal Control
  43
  - Dialing
    44
- E - Echo Back
  45
- F - Set
  45
  - Hook Control
    46

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