METRON QA-IDS, User & Service Manual

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6. Component Functions and Parts
This chapter provides a description of the functions of the QA-IDS
components, and a parts list for cross reference.
The QA-IDS consists of an independent primary switched power
supply, a keypad board, a processor board, a LCD display and an in-
dex transmitter mounted on the pump. The processor board, keypad
board and index transmitter are described in diagrams, contained in
Appendix A. One is a Component Location Diagram. Another,
F190.20.2000.10, is a schematic diagram describing the keyboard,
pressure sensor, and pump index. F190.20.1N00.10 diagrams the
Processor Board Main Part. Set F190.20. 1000.10 through
F190.20.1900.10 are schematic diagrams describing the processor
board by function. The boards are connected by 2 x 16-conductor
flat cables, 1 x 3-conductor and 1 x 2-conductor.
6.1 Theory of Operation
The QA-IDS is an infusion pump tester that runs on 110 - 230 V AC
mains voltage. The unit is based on a Motorola microprocessor.
Controls on the front panel of the unit allow testing of all the func-
tions of an infusion pump.
QA-IDS performs tests according to IEC Draft Standard 62.D and
IEC 601.2.24. Test results, which are shown in the QA-IDS LCD
display, may be printed out on an external printer. A serial port
(RS-232C) enables the unit to be controlled from a PC, simply by
using the PRO-Soft QA-IDS software program.
The program in QA-IDS is stored in RAM with battery backup, and
can be updated from a PC via the built-in serial port.
6.2 Power Supply
The power supply consists of a primary switched unit, mounted on
the backplane, that supplies 24 VDC, 2A to the processor board
(V24P). The processor board is equipped with a secondary switched
regulator that gen 5 VDC (Vcc). Via a passive filter, this is
used as the supply voltage to the measurement amplifier and A/D
converter (V5P). A capacitive switched supply generates - 5 VDC to
the measurement amplifier and A/D converter (V5N). A reference
voltage of 4.096 V is generated from V5P, which is used for the A/D
and pressure sensor. The supply voltages are monitored by a watch-
dog, and the unit is reset if V24P falls below 20 V. The contrast on
the display is regulated using R160. The stepper motor drivers are
supplied directly from V24P.
6.3 Printer Output
The QA-IDS has a printer output with a standard 25-pin D-sub con-
tact for Centronics interface. The drivers are built up with TTL in-
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