3M C960, Service Information

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Model C960 Headset Intercom System
OperationandDiagrams
1-7
E
3M 2000 May
n
Note
The vehicle detect PULSE/PRESENCE jumper J4
must be set appropriately and its setting
programmed into the base station logic for correct
vehicle detection and alert tones to occur.For
further explanation of vehicle detect alert tones,
refer to the Vehicle Alert System, The vehicle
detect PULSE/PRESENCE jumper J4 must be set
appropriately and its setting programmed into the
base station logic for correct vehicle detection and
alert tones to occur.For further explanation of
vehicle detect alert tones, refer to the paragraphs
titled Vehicle Alert System and Vehicle Detector
Input in this section.
Menu Mic Input
Audio from the menu sign may come from one of two
sources: a combination speaker/microphone (the
MENU SIGN SPEAKER) or a separate dynamic
microphone (the MENU MIC). The MIC/SPKR
jumpers J1 and J2 must be set accordingly; both must
be set to the MIC position if a separate outside mic is
used, to the SPKR position if a combination outside
speaker/mic (OSM) is used. Depending on jumper
positions, mic input is routed to the mic amplifier,
through the amplifier and its Menu Mic Sensitivity
control and then:
S
To the monitor speaker amplifier via the MON IN
volume control, through the monitor speaker
amplifier and the Master Monitor volume control
to the monitor speaker
S
Through the transmit amplifier to the TXMT
&TXMT LOGIC for transmission to all headset
receivers, and to output connector pin 9 for use in
cross-lane applications
Base Station Configuration Jumpers and
Switches
Configuration Jumpers
Jumpers J1 and J2 are used to configure the base
station for use with either a separate outside
microphone or a combination outside speaker/mic
(OSM). Unlike jumpers J3, J4 and J5 which affect
logic input levels, jumpers J1 and J2 simply switch
the microphone amplifier inputs to either the
microphone or OSM. Set both jumpers to jumper pins
2 and 3 for use with a separate outside mic, or to
jumper pins 1 and 2 for a combination speaker/mic
(OSM).
Jumper J3 is used to configure the base station for use
in a cross-lane, dual-lane communications system. In
such a system, one base station must be set for lane 1
frequency communications, the other base station
must be set for lane 2 frequency communications.
Jumper J3 pins 1 and 2 (forcing the related logic input
high) for lane 1 configuration. Jumper J3 pins 2 and 3
(forcing the related logic input low) for lane 2
configuration. Whenever jumper J3 is changed, you
must press the base station RESET switch to program
the new jumper setting into the base station
microprocessor.
n
Note
It may also be necessary to re-program system
headsets, depending on system configuration.
Refer to the C960 Installation Instructions for more
information.
Jumper J4 is used to configure the base station for use
with either a presence type vehicle detector or a pulse
type vehicle detector. Jumper J4 pins 1 and 2 (forcing
the related logic input high) for a presence type
detector. Jumper J4 pins 2 and 3 (forcing the related
logic input low) for a pulse type detector. Whenever
jumper J4 is changed, you must press the base station
RESET switch to program the new jumper setting into
the base station microprocessor.
Jumper J5 is used to configure the base station so that
it can in turn, program the headsets for standard (talk,
then listen, then talk etc.) communications or for
duplex (simultaneous talk and listen)
communications. During standard communications,
headset receiver output is muted during talk
transmissions. During duplex communications,
headset receiver output is not muted during talk
transmissions. The headset receiver mute/not mute
(standard/duplex) command is sent to the headset
logic during headset programming—determined by
the jumper J5 setting. Whenever Jumper J5 is