Tandy 1400LT - Page 6

Figure
Number
List of Illustrations
DESCRIPTION
Page
Number
1-1
1-2
1-3
1-4
1-5
1-6
2- 1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-1
0
2-1 1
2-1 2
2-1 3
2-1 4
2-1
5
2-1 6
2-1 7
2-1 8
2-1 9
2-20
2-2 1
2-22
2-23
2-24
3-1
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-1
0
4-1 1
4-1 2
4-1 3
4-1 4
4-1
5
4-1 6
4-1 7
4-1 8
4-1 9
4-20
4-21
Front View
....................................................................................................................................................... 1-3
Rear View
........................................................................................................................................................ 1-3
Main PCB
......................................................................................................................................................... 1-4
Power PCB
...................................................................................................................................................... 1-5
Memory PCB
................................................................................................................................................... 1-6
Case Screw Removal
.................................................................................................................................... 2-1
Top Case Removal
........................................................................................................................................ 2-2
Cable Removal
............................................................................................................................................... 2-2
Battery Cover and Rear Cover Removal
.................................................................................................... 2-3
Lever Spring Removal
................................................................................................................................... 2-3
Top Cover Removal
....................................................................................................................................... 2-4
Exploded View of LCD Assembly
................................................................................................................. 2-5
Cable Cover and LCD Removal
................................................................................................................... 2-5
Arm Assembly Removal
................................................................................................................................ 2-6
LED PCB and Keyboard Removal
............................................................................................................... 2-6
Battery Connector Removal
.......................................................................................................................... 2-7
Right side of Base Frame
............................................................................................................................. 2-7
Left Side
of Base Frame ............................................................................................................................... 2-8
Connector Locations
...................................................................................................................................... 2-8
Power Switch cord Removal
......................................................................................................................... 2-9
FDD Removal
................................................................................................................................................. 2-9
Exploded View
of Power Source Assembly ................................................................................................ 2-10
Bottom View of Base Frame
........................................................................................................................ 2-11
Contrast knob Removal
................................................................................................................................. 2-12
Speaker Removal
........................................................................................................................................... 2-12
Exploded View
of Main PCB Assembly ....................................................................................................... 2-13
Bottom Case Dismantling
.............................................................................................................................. 2-14
Battery Pack Replacement
........................................................................................................................... 2-15
Frequency Adjustment
................................................................................................................................... 3-1
Organization of Section IV
............................................................................................................................ 4-1
Block Diagram
................................................................................................................................................. 4-2
CLOCK-GEN.1
................................................................................................................................................ 4-4
CLOCK-GEN.2
................................................................................................................................................ 4-5
CLOCK-GEN.3
................................................................................................................................................ 4-5
CLOCK-GEN.4
................................................................................................................................................ 4-6
MEMORY-MAP
............................................................................................................................................... 4-7
DIP-SW Location
............................................................................................................................................ 4-7
DIP-SW
............................................................................................................................................................ 4-7
RAM-1
.............................................................................................................................................................. 4-8
RAM-2
.............................................................................................................................................................. 4-8
RAM-3
.............................................................................................................................................................. 4-9
MEMORY-CARD
............................................................................................................................................. 4-10
LCD PCB
......................................................................................................................................................... 1-6
Lever Disengagement
.................................................................................................................................... 2-1
ROM Address Decoder Circuit
..................................................................................................................... 4-11
ROM and Peripheral Circuitry
....................................................................................................................... 4-11
71 059C and Peripheral Circuitry
................................................................................................................... 4-15
KEYBOARD-1 (The Block Diagram in the GATE 4)
.................................................................................. 4-16
KEYBOARD-2 (IC50 and Peripheral Circuitry)
............................................................................................ 4-16
KEYBOARD-3 (Internal Keyboard Specification)
....................................................................................... 4-17
KEYBOARD-4 (Position, Layout and Matrix)
.............................................................................................. 4-18
KEYBOARD-5 (The External Keyboard Interface Circuit and Timing Diagram
...................................... 4-30
V