3M C860, Manual

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Acoustic Dampening Foam
Below is purchase information for acoustic dampening foam. This foam is recommended to enhance
duplex operation in
C960 speaker posts:
Illbruck Inc. Part #: LP200U 1.5" x 12" x 12"
3800 Washington Ave. N. Description: LP200U Charcoal foam, size:
1.5 x 12 x 12 inch
Minneapolis, MN 55412 Qty Price (EA)
Phone: 612-521-3555 100 $3.960
Fax 612-521-5639 250 $3.350
Website: www.illbruck-sonex.com 500 $3.240
4 - 6 weeks lead-time
C960 Cross-Lane System Installation
The C960 Cross-Lane System provides communication for facilities that have two menu signs. This
information has been rewritten in a clearer format. It is attached to this bulletin.
Tips and Tricks
•
When troubleshooting “short range” problems, don't overlook the physical location of the
C960/C760 Base Station. Remember, the left-hand side, containing the RF section, must be at
least 3 feet from large metal objects, such as refrigerators, ranges, coolers, etc., and other metal or
electrical devices. This also includes metal window frames, water pipes, and electrical conduits,
which could be hidden beneath the wall surface. The Installation Instructions recommend that you
move a powered Base Station around the desired mounting area as someone talks and listens on a
headset for the optimum range.
•
A high percentage of failed C960 Battery Chargers are returned for processor failure. This
component failure primarily stems from the power plug accidentally contacting the analyzer
terminals, located directly next to the power jack. This has the potential of ruining the processor!
Because of this potential problem and due to the lack of demand for the optional analyzer, we are
discontinuing putting the analyzer terminals on chargers. The terminal/port has been removed
from both chargers.
•
When replacing a boom microphone on a C960 headset, the mic boom base cover should also be
replaced. The self-tapping screw will hold better if it is installed in a new base cover. If this is not
possible, and the base must be re-used, place a very small drop of white wood glue on the threads
of the self-tapping screw before inserting it into the base cover.
•
A previous Technical Bulletin, dated 7/14/99, had an article listed under “Tips and Tricks” about
cleaning grease buildup from under the
C960 silicone switches. It mentioned cleaning the
switches and circuit board with a Q-tip moistened with alcohol.
We have found that alcohol will dissolve grease. The grease will get into some tuned components
in the multiple-layer circuit board. This could cause circuit board problems!
Do not use alcohol to clean the switch traces on the C960 circuit board! Use only a soft dry cloth.
Technicians in the 3M Repair Center have the best success with a 3M brand “Scotch-Brite High
Performance Cloth”. These cloths can be found in the FST Related Products Price Pages “CFM-
700” U.P.C. number 500-4811-25889-3 or, with cleaning supplies in most retail stores. You may