3M 478DA (D-15) 用户手册
Technician Troubleshooting Guide
Model 481BA (D-20)
2
3
Intracom D-20
VOLUME
OFF ON
SP-205A
9
8
7
6
5
4
1
2
3
Figure 1. Operating Controls
Key
Control Name
Function
1
Power Switch
Provides power to mainstation.
2
Power Indicator Light
Indicates power is on and the system is ready to operate.
3
Volume Control
Adjusts INCOMING audio level.
NOTE: Volume level adjustments for alert tone and outside
speakers are set by the installer.
speakers are set by the installer.
4
Channel Selector Switches (1-6)
These switches control talk/listen communication for
numbered channels. Operator touches switch to talk and
releases switch to listen.
numbered channels. Operator touches switch to talk and
releases switch to listen.
5
Indicator Lights
Red indicates TALK mode.
Green indicates LISTEN mode.
Yellow (steady) indicates channel on "HOLD."
Yellow (flashing) indicates incoming call WAITING.
Green indicates LISTEN mode.
Yellow (steady) indicates channel on "HOLD."
Yellow (flashing) indicates incoming call WAITING.
6
Hold Switch
Places selected channel in "HOLD" mode.
7
All Call Switch
Controls conversation with all channels simultaneously.
8
Standby Switch
Silences incoming audio to eliminate undesired background
noise pickup when unit is not in use. Touching any
CHANNEL SELECTOR SWITCH releases STANDBY
mode.
noise pickup when unit is not in use. Touching any
CHANNEL SELECTOR SWITCH releases STANDBY
mode.
9
Standby Indicator Light
Indicates unit is in STANDBY mode.