Tandy 1400LT - Page 3

IV-I 1 . Interrupt ...................................................................................................................
IV.12 . Keyboard .................................................................................................................
IV.13 . External Keyboard ................................................................................................
IV-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
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4-62
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5-1
6-1
6-1
6-1
6-3
6-5
6-7
FDD PCB Control Parts Location
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6-8