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3.0 GENERAL MAINTENANCE INFORMATION
3.1
MODULES
The WY-SO utilizes modular construction techniques.
This allows
the service technician to replace the failing module with a
minimum amount of down time.
The terminal consists of three major modules (see Figure 3-1),
these modules are described below:
MODULE NAME
1.
Monitor/Power Supply
2.
Keyboard
3.
Microcomputer PCB
FUNCTION
The monitor/power supply
performs two major functions;
it converts AC input voltage
to the required DC voltages
(+SV, +12V and -23V) and
contains the necessary logic
for the horizontal, vertical,
and video signals for display
on the CRT screen.
The keyboard is a scanned
matrix which, when a key is
pressed, flags the CPU so that
the appropriate key code can
be generated.
Key debouncing
is done by the CPU.
The microcomputer PCB contains
all of the electronics neces-
sary to generate the video
signals as well as all
I/O
signals.
All of the
control
logic resides on this printed
circuit board.
3-1
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