3M C860, Manual

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Food Service Trade Department
3M Commercial Care Division
3M Center, Building 551-1E-02
St. Paul, MN 55144-1000
4 19981103
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The C960 Battery Charger contains 3 or 6 independent charger modules. They share only the power
supply. Therefore, you may see several independent symptoms but seldom will it affect all slots.
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The C960 Battery Charger automatically discharges the battery for about 15 minutes or down to 1
volt, whichever comes first. However, it cannot remove more than about 20% of a full charge.
Therefore, to prevent memory build-up, as often as is practical, use the batteries until the low battery
alert sounds. It is OK to change the battery at shift change time most of the time as long as it
occasionally gets completely discharged in the headset. Otherwise, you may need to occasionally
press the Condition button with the cell in that slot. A rechargeable cell can typically be recharged
500 to 1000 times; the process of conditioning uses up two of those charge cycles, so it should not be
done indiscriminately.
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Some C960 mics are reported to be lower in volume than others. We noticed some returned mics
have the holes plugged with food. This can decrease or increase the power of the mic. Do not use
solvents; use a toothpick to clean the holes. Don’t forget to replace the foam mic cover; this is
probably how the holes got plugged in the first place.
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Since the C960 microphone is of a noise canceling type, it MUST be positioned at the corner of the
mouth…not below the chin, or low outbound audio will result.
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Older style C960 mics with the butt joint can be reinforced with a piece of clear shrink tubing. Place a
short piece of tubing over the butt joint where the plastic tip meets the rubber boom; then carefully
apply heat. Tubing can be purchased from Newark Electronics - Alpha, p/n FIT 295, 3/8” clear, semi-
rigid poly.
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Complaints of “loose fitting” C960 headsets may stem from not replacing the headband side pads
often enough. These compress with age resulting in discomfort and a loose fit.
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If a C760 system has been upgraded with C960 headsets, a symptom of delayed or no TALK LED has
been reported. Please call 3M FST Communications Products Technical Service (800-328-0033) for a
solution to this problem.