3M C860, Manual

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ü
Avoid setting the width adjustment tab too tight for a large head. This will stretch the headband over
time.
ü
Change all headband pads regularly for hygienic reasons and to assure a comfortable fit. New pads can
tighten the headband by 3/4 inch.
ü
Cut a piece of 1/16" to 3/16" thick, double-stick foam tape to 1" long by 1/4" wide. Apply this tape to
the folding headband arm directly under the width adjustment tab. This method will work on the old
style as well as the new style headbands with the two raised width adjustment stops molded onto the
folding arm.
ü
Apply a heat gun to both sides of the folding headband arm for approximately 30 seconds. This should
soften it enough to allow it to be bent to a tighter arc. If enough heat is not applied, the nylon might
return to its original arc after cooling.
•
C960 headsets with low or no listen volume may merely have the speaker hung up on the magnet. This is
generally the result of a drop. Many times this can be corrected in the field. Place a small dowel rod, such
as a wooden Q-tip handle or a toothpick, through one of the speaker cover holes and gently push the speaker
back over the magnet.
•
If extra pressure on C960 or C760 headset buttons is needed to activate the base station TALK or PAGE
LEDs the problem may be grease buildup under the headset buttons. Disassemble the case and clean the
bottom of the silicone switches and the circuit traces with a Q-tip and alcohol. If this is not done, the extra
pressure will flex the circuit board and fracture components.
•
Replace C960 and C760 microphone windscreens regularly. If the windscreen is torn or missing, dirt and
grease can plug the holes in front or back of the microphone. Sometimes the holes can be cleaned with a
toothpick. Solvents will ruin the mic.
•
The C960 charger automatically discharges cells that are placed in it. However the left two slots can only
remove 10% of a full charge and the right hand slot can only remove 20% of a full charge. Therefore, as
often as is practical, leave the batteries in the headset/beltpack until the low battery alert sounds.
•
An improved C960 Outer Case is now available from spare parts. The part number has not changed (78-
8095-0525-4). It has threaded brass inserts for the case screws and it includes the screws. Avoid over-
tightening the screws to prevent the screw ends from protruding through the Inner Case.
To prevent the plastite screws from loosening on the old-style case place a VERY small drop of white wood
glue on the screw threads before tightening.
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