3M C960, Service Information

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Model C960 Headset Intercom System Troubleshooting
4-1
E
3M 1997 September
Analyzing Batteries
The battery analyzer is used in conjunction with the
battery charger to test the condition of headset
batteries. The analyzer performs five tests:
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Discharge
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Cycle 1
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Cycle 2
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Cycle 3
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Cycle 4
DISCHARGE Test
The DISCHARGE test discharges the battery to a
level of 1.0 volt. As the battery is discharged, the
LCD continually displays the milliampere value in
direct proportion to the amount of energy being
removed from the test battery. The value displayed at
the start of the test is the battery capacity from the
previous charge. Because this test leaves the battery
fully discharged, it is useful in testing other battery
chargers.
CYCLE 1 Test
The CYCLE 1 test is a 3-phase test that charges,
discharges, and then recharges the battery.
During the first phase, the battery is charged.
During the second phase, the battery is discharged to a
level of 1.0 volt. As the battery is discharged, the
LCD continually displays the milliampere value in
direct proportion to the amount of energy being
removed from the test battery.
During the third phase, the battery is fully charged.
After the battery is charged, the LCD displays the
actual capacity of the battery in milliampere hours
(mA hr). If the measured capacity is less than 80% of
the rated capacity of 1200 mA hr, another cycle
should be initiated. Another CYCLE 1 test can be
initiated without removing the battery.
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Note
When CYCLE 1 test is selected again for the same
battery, the test skips the first phase.
CYCLE 2, CYCLE 3, and CYCLE 4 Tests
These tests are variations of the CYCLE 1 test, and
are used to exercise a battery to bring back lost
capacity.
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The CYCLE 2 test performs two cycles of charge,
discharge, and recharge.
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The CYCLE 3 test performs three cycles of
charge, discharge, and recharge.
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The CYCLE 4 test performs four cycles of charge,
discharge, and recharge.
Following the discharge phase of the each cycle, the
LCD displays the number of cycles that remain.
The LCD messages are as follows for the a typical
CYCLE 4 test:
READY
CYCLE 4
(test initiated)
(Charge, discharge, recharge)
CYCLE 3
(Charge, discharge, recharge)
CYCLE 2
(Charge, discharge, recharge)
CYCLE 1
(Charge, discharge, recharge)
READY
CYCLE 4
(test complete)