Section I. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
You must conduct periodic preventive maintenance checks and services (PMCS) of
the Medical Research Laboratories (MRL) Porta Pak 90 defibrillator/monitor to ensure its
CONTROLS AND STATUS INDICATOR CONTROLS
Review the functions of the following controls and status indicators to ensure that
you understand their purpose and how they function. Refer to figures 1-1 through 1-6.
The numbers in parenthesis correspond to the numbers in figures 1-1 through
a. Controls and Status Indicators for the Monitor. Refer to figure 1-1 for
paragraphs (1) through (11).
(1) Power control (1). The power control is the green push button switch for
the main power to the monitor module. The power light is lit when the unit is on. When
the monitor module is connected to the direct current (dc) defibrillator, turn the monitor on
by depressing the defibrillator power switch. This is done to save operator time in an
(2) Electrocardiograph monitor display (2). The nonfade electrocardiograph
(ECG) display moves from right to left.
(3) Quasi-Random Signal volume control (3). Turn the Quasi-Random Signal
(QRS) volume control (3)switch clockwise to increase the volume of the systole beeper.
For a 1 millivolt (mv) signal, push the switch and release it to activate the calibration signal
on the ECG monitor and chart recorder.
(4) Electrocardiograph size control (4). Turn the control clockwise to increase
the amplitude. Push the button to hold or freeze the trace on the monitor scope.
(5) Heart rate alarm control (5). Two rotary switches control the setting of the
heart rate alarm limits. Turn the controls counter clockwise for low and clockwise for high.
The Hi control provides a range of 100 to 240 beats per minute (bpm) and OFF. The Lo
control provides a range of 30 to 100bpm, and OFF. When the alarm limits are exceeded,
a steady tone is activated. When the chart recorder switch is in the AUTO mode, the chart
recorder starts automatically and runs for 15 seconds. To deactivate the alarm system,
turn both controls to OFF.