Clear-Com SB-704 - Manual (Page 10)

S B - 7 0 4 M A I N S T A T I O N 1 - 4
providing separate short-circuit-protected power sources to each of
the four intercom lines. A short on one intercom line will not bring
the whole system down. Short-circuit indicators are provided on the
front panel for each channel.
NORMAL OPERATION
Once installed and operational, the SB-704 is easy to operate. The following
sections describe normal operation of the unit, use of controls available under
the access panel, and abnormal operation of the power distribution system.
Normal operation of the SB-704 requires access only to the front-panel
controls. The following is a brief description of how to use the front-panel
controls in day-to-day operation.
There are option DIP switches and adjustment controls behind the access
panel on the lower portion of the front panel. To gain access to the switches
and controls, pull on the two latches on either end of the access panel and
remove it.
This section discusses the following subjects:
• Intercom power status lights
• Selecting microphones and enabling the speaker
• Listening to intercom channels
• Monitoring main program
• Talking on intercom channels
• The all-talk function
• Sending and receiving call signals
• Linking intercom channels together
• The announce function
• Channel assignments using the slide switch matrix
Intercom Power Status Lights
The four red short lights are failure indicators for each of the four intercom
lines. These lights will assist in locating a shorted or overloaded channel.
Within as little as ½ second of automatically cutting off power to an
overloaded intercom line, the SB-704 will attempt to turn power on again.
This allows momentary short or overload conditions to clear automatically.
Shorts are normally caused by miswiring or damaged cables. Overloads are
generally caused by connecting too many beltpacks and stations to an
intercom line.
Clear-Com’s advanced fail-safe design can sense the difference between a
short or an overload to optimally protect itself. Power is restored in as quickly