3M Food Services Trade Department
3M Center
St. Paul, MN 55144-1000
© 3M August 2000
20000824
Wireless Intercom Systems
Model C960/C860
Technical Bulletin 8/24/00
3M Loop Detectors, Models A200 and A201 on Hold
The 3M Loop Detectors, Models
A200 and A201
are on hold until further notice. A problem with the
sensitivity has been discovered that causes some units to fail to detect cars that are very close together in
the drive-thru lane.
We are supplying our former Model 917-1 Loop Detector (78-8028-9317-8) as an alternate until this
problem is corrected. Pricing for this unit will be the same as the current new external unit. We
recommend against installing any Models A200 and A201 Detectors that you might have in your
inventory. You will be notified when corrected units are in stock and we will exchange them at that time.
There is no alternate unit available for the internal base station unit. You will have to use an external unit.
You may return any previously installed units that are not operating satisfactorily. We apologize for any
inconvenience and hope to have corrected units in stock shortly.
New C860 Headsets Low Outbound Volume
The new
C860
“Type 2” (78-8117-3964-4) headset was released in March 2000. Early units have lower
microphone output than C960 headsets. To correct this problem, replace the 2.2k Ohm resistor across the
microphone, located under the ear cup cover, with a 4.7k Ohm resistor. The microphone output will then
match that of the C960. The microphone output on all units in our stock has been corrected.
All new “Type 2” C860 headsets have lower inbound volume than C960 units. This should not be a
problem if all units in a system consist of C860 “Type 2” headsets. The Menu Mic Sensitivity may be
increased on the Base Station to compensate for this. If C860 “Type 2” headsets are mixed with C960
units the inbound volume must be increased by three steps on each C860 beltpack. This will compensate
for the lower inbound volume.
3M
“Internal”
Noise Reduction Module, Model A125
We have identified a problem in some of our early
internal
noise reduction modules, pn: 78-9236-6453-2.
The symptom you may experience is a “clicking” or “motorboating” sound on outbound audio,
particularly on hard consonants. This is primarily evident when the unit is turned “Off”. The only way to
eliminate this is to disconnect the unit from the base station. Shipments made after July 21, 2000 have
been screened and tested and are good. If you have some earlier units that exhibit this problem please
return them to us for replacement.
Summary of Contents for C860
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