MSA OptimAir MM 2K - Page 24

TAL 0110 (L) Rev. 8 - 10020949
TEST METHOD FOR OPTIMAIR MM 2K
TESTING THE BATTERY PACK:
The electrical function of the battery
pack can be measured by using a mul-
timeter and measuring voltage and
resistance across the pins of the con-
nector.
Before Testing:
1. Examine the battery pack for cracks
or other physical damage. If any of
these conditions exists, replace the
battery pack.
2. Fully charge the battery before test-
ing. If the charger failed during the
charging process follow these steps
below to determine the cause.
a. Unplug the charger from the out-
let to reset the charger’s electron-
ics.
b. Plug the charger back in and
connect a different battery to the
charger.
c. If the charger fails again during
charging the charger is defective
and should be replaced. If the
charger completes a successful
charge the original battery is
defective and should be replaced.
3. Align connector/battery pack like
the diagram below.
Testing the Open Circuit Voltage
across the Switch:
1. Set the multimeter to measure volt-
age.
2. Turn the switch on the battery pack
to the "OFF" position.
3. Place the positive probe on pin 1
and the negative lead on to pin 2.
4. The voltage should read 0 Volts.
5. Turn the switch to "ON".
6. The voltage should now read above
4.8 Volts minimum.
Testing the Open Circuit Voltage
across the Recharge Circuit:
1. Set the multimeter to measure volt-
age.
2. The switch can be "ON" or "OFF".
3. Place the positive probe on pin 4
and the negative lead on to pin 2.
4. The voltage should read above 4.8
Volts minimum.
Testing the Thermistor for
Charger Control:
1. Set the multimeter to measure
resistance.
2. The switch can be "ON" or "OFF".
3. Place the positive probe on pin 3
and the negative lead on to pin 2.
4. The resistance should read between
7KΩ and 18KΩ. This measurement
is temperature dependent, so the
battery pack must be between 50˚F
and 85˚F.
A battery pack failing any of the
above tests is defective and should
be replaced.
Note: Attempting to charge a battery
pack which failed the test for "Open
Circuit Voltage Across the Recharge
Circuit" or the tests for "Thermistor
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2
4
3
A
B
C