MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 15
Invisible place holder
Figure 10. Typical Rack-Mounted External DC Power Supply
(with dual supplies)
4.4 Backup Battery
A single backup battery is normally installed in AC-powered master sta-
tions. To prevent battery discharge during shipment, the radio’s internal
Battery Backup switch is set to OFF at the factory. Set this switch to ON
during installation to activate the radio’s battery-backup feature.
Location of Battery Backup Switch
The BATTERY BACKUP control switch is located behind the front panel
to enable and disable the internal back-up battery. Access the switch by
removing the front panel (see Figure 11 on Page 16).
To remove the front panel, grasp it firmly along its bottom edge and pull
it away from the radio chassis (see Figure 8 on Page 13). Set the front
panel aside, using care not to damage the interconnecting cable.
In most cases, the radio begins transmitting as soon as power
is applied. Be sure that a proper load is attached to the radio’s
RF output connector before applying battery or mains power.
If AC power is disconnected, or the rear panel AC power
switches are set to OFF, the radio continues to operate on
battery power until the battery discharges (approximately
1 hour). When shipping or storing the radio, always set the
BATTERY BACKUP switch to OFF to prevent discharge.
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
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