Tandy 1400LT - Page 7

4-22
4-23
4-24
4-25
4-26
4-27
4-28
4-29
4-30
4-31
4-32
4-33
4-34
4-35
4-36
4-37
4-38
4-39
4-40
4-4 1
4-42
4-43
4-44
4-45
4-46
4-47
4-48
4-49
4-50
A- 1
A-2
A-3
A-4
A-5
A-6
A-7
A-8
A-9
A-1
0
A-1 1
A-1 2
B-1
8-2
8-3
B-4
B-4-a
B-4-b
8-5
B-6
c- 1
c-2
c-3
c-4
c-5
C-6
c-7
C-8
The
FDD and Peripheral Circuitry Block Diagram ..................................................................................... 4-34
DMA Controller and Peripheral circuitry ...................................................................................................... 4-35
cpu Interface for FDC .................................................................................................................................. 4-36
FDD Interface Circuitry .................................................................................................................................. 4-37
VFO and FDC Interface ................................................................................................................................. 4-38
printer Interface Circuit
.................................................................................................................................. 4-40
Timing Diagram Between CPU and Printer
................................................................................................. 4-41
LCDC-CPU Interface
...................................................................................................................................... 4-42
VRAM-LCDC interface
................................................................................................................................... 4-43
VRAM-LCDC Timing Chart
............................................................................................................................ 4-44
Interface Signal Between LCDC and LCD Unit
.......................................................................................... 4-45
LCD Interface Timing Diagram
..................................................................................................................... 4-46
NTSC COMPOSITE Interface
....................................................................................................................... 4-47
IRGB Interface
................................................................................................................................................ 4-47
NTSC COMPOSITE Interface Timing Diagram
.......................................................................................... 4-48
Serial Interface Block Diagram
..................................................................................................................... 4-50
Pin Layout Definitions of UART
.................................................................................................................... 4-50
Switching Logic (RS232C. MODEM)
............................................................................................................ 4-51
RS232C Interface Circuit
............................................................................................................................... 4-52
Internal Modem Connector and Peripheral Circuitry
.................................................................................. 4-52
4-53
EL Output Waveform
..................................................................................................................................... 4-55
5V Equivalent Circuit
...................................................................................................................................... 4-57
R.C.C (Ringing Choke Converter)
................................................................................................................ 4-58
Power PCB Circuit Diagram-1
....................................................................................................................... 4-59
Power PCB Circuit Diagram-2
....................................................................................................................... 4-60
Power PCB Circuit Diagram-3
....................................................................................................................... 4-61
Block Diagram
................................................................................................................................................ A-1
VO Adjusting Circuit ....................................................................................................................................... A-4
LCD Screen
.................................................................................................................................................... A-5
Timing Chart
................................................................................................................................................... A-6
Timing Chart
................................................................................................................................................... A-8
Timing Chart
................................................................................................................................................... A-8
Optical Characteristics Measurement System
...........................................................................................
A-9
Definition of Responce Time
....................................................................................................................... A-9
Definition of
4 and 8 ..................................................................................................................................... A-10
Definition
of Contrast Ratio .......................................................................................................................... A-10
Operational Precautions
............................................................................................................................... A-13
Unsoldering EL Terminals (Bottom View)
.................................................................................................. B-1
Detaching EL (Right Side View)
.................................................................................................................. B-1
EL Removal
.................................................................................................................................................... 8-2
EL Insertion
.................................................................................................................................................... 8-3
Incorrect Insertion
......................................................................................................................................... B-3
Incorrect Insertion
......................................................................................................................................... B-3
Attaching EL (Right Side View)
...................................................................................................................
8-4
Soldering EL Terminals
................................................................................................................................ 8-4
Functional Diagram
....................................................................................................................................... C-3
Disk Chucking Mechanism
........................................................................................................................... C-5
Interface Connections
................................................................................................................................... C-6
Recommended Circuit
.................................................................................................................................. C-7
Step Pulse Timing
......................................................................................................................................... C-9
Write Data Timing (MFM)
.............................................................................................................................
C-9
Write Gate and Write Data Timing
..............................................................................................................
C-10
Index Signal Timing
....................................................................................................................................... C-11
IRGB Interface Timing Diagram
................................................................................................................... 4-49
RTC and Peripheral Circuitry
........................................................................................................................
Speaker Block Diagram ................................................................................................................................. 4-54
Dot Dimensional Drawing
............................................................................................................................. A-2
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