Technician Troubleshooting Guide Model 481BA (D-20)
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Intracom D-20
VOLUME
OFF ON
SP-205A
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76
5
41
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Figure 1. Operating Controls
Key ControlName Function
1 Power Switch Provides power to mainstation.
2 PowerIndicator Light Indicatespower is on and the system is ready to operate.
3 VolumeContro l Adjusts INCOMING audio level.
NOTE: Volume level adjustments for alert tone and outside
speakers are set by the installer.
4 ChannelSelecto r Switches( 1-6) These switchesco ntrol talk/listen communicationfor
numbered channels. Operator touches switch to talk and
releasesswitch to listen.
5 IndicatorLights Redindicates T ALKmode.
Greenindicates LISTEN mode.
Yellow(steady) indicates channelon "HOLD."
Yellow(flashing) indicates incoming call WAIT ING.
6 Hold Switch Places selected channelin "HOLD" mode.
7 AllCall Switch Controls conversatio nwith all channels simultaneously.
8 Standby Switch Silences incoming audio to eliminate undesired background
noise pickup when unit is not in use. Touching any
CHANNELSELECTOR SWITCH releasesST ANDBY
mode.
9 StandbyIndicator Light Indicatesunit is in STANDBY mode.