8. Component Functions and Parts
This chapter provides a description of the functions of the main com-
ponents of the QA-1290, as well as a parts list for cross-reference.
8.1 System Overview
QA-1290 consists of three different modules inside the cabinet: proc-
essor and keypad board in the front of the cabinet; the QA-1290
board located on the left side of the cabinet bottom, and; the power
supply located on the middle of the cabinet rear wall. There are also a
number of pneumatic parts to generate pressure and pulses for the
simulations and tests. The processor and keypad boards, with two
modifications, are the same as those on the QA-90. The QA-1290
board contains drivers for valves, the step motor, the compressor and
the pressure measurement circuit. It also generates the supply volt-
ages needed in addition to +5V and +24V. Communication between
the processor and QA-1290 boards is by a 16-conductor ribbon cable.
8-1
The following block diagram shows the hardware used in the QA-
1290. The electronic components are found on the QA-1290 board,
as well as the processor and keypad boards.
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