Tandy 1400LT Service Manual page 3

I V - I 1
.
Interrupt
...................................................................................................................
IV.12
.
Keyboard
.................................................................................................................
IV.13
.
External Keyboard
................................................................................................
I V - I 4
.
Floppy Disk Drive
..................................................................................................
DMA Control
...........................................................................................................
FDD Control
............................................................................................................
IV.15
.
Printer Interface
.....................................................................................................
IV.16
.
LCD Controller
.......................................................................................................
CPU Interface
.........................................................................................................
VRAM-CPU Interface
.............................................................................................
LCD Unit Interface
.................................................................................................
NTSC Composite and IRGB Interface
..............................................................
IV.17
.
Serial Interface
.......................................................................................................
RS232C Interface Circuit
.....................................................................................
IV.19
.
Speaker Circuit
.......................................................................................................
Power Source
.........................................................................................................
Battery Voltage Warning
.....................................................................................
Power Save Mode
.................................................................................................
5V Output Voltage Circuit
...................................................................................
12V Output Voltage Circuit
.................................................................................
EXPANSION BUS
...................................................................................................
Internal MODEM Connection
..............................................................................
EXPANSION BUS PCB Mechanical Drawing
...................................................
MODEM PCB Mechanical Drawing
.....................................................................
IV.18
.
RTC
...........................................................................................................................
IV.20
.
POWER Supply
.......................................................................................................
IV.21
.
OPTION
....................................................................................................................
PART V
.
TROUBLESHOOTING
...................................................................................
PART VI
.
EXPLODED VIEW and Parts List
.........................................................
VI-I
.
Exploded View
.......................................................................................................
Overall Assembly Diagram
..................................................................................
LCD Unit. Parts Locati0n.A. .B.
.........................................................................
FDD Motor Spindle Parts Location
...................................................................
FDD Disassembly. Assembly and Parts
...........................................................
4-1 5
4-16
4-30
4-34
4-35
4-36
4-40
4-42
4-42
4-43
4-45
4-47
4-50
4-52
4-53
4-54
4-55
4-56
4-56
4-56
4-57
4-58
4-62
4-62
4-64
4-65
4-70
5-1
6-1
6-1
6-1
6-3
6-5
6-7
FDD PCB Control Parts Location
......................................................................
6-8