Tandy 1400LT Service Manual 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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