FleX-Net
TM
Installation and Operation Manual
99
Backup Amplifier
Any amplifier may be designated as a backup amplifier when backup is required. It should be installed in any audio
cabinet and in the right-most slot position of a QMB-5000B backplane.
Figure 68: QAA-5160-70/25 Amplifier (Backup Application)
Any amplifier may be designated as the
backup amplifier and this backup amplifier
must have the MD-789 molex connector
placed in the bottom left-hand corner of
the board as shown in the adjacent figure.
The QAA-5160-70/25 as backup amplifier
is inserted into the motherboard. No
connections are made to the backup
amplifier's terminals except for end-of-line
resistors which are to be placed directly on
the terminals in the audio cabinet.
Once the Backup Amplifier is installed, it
must be properly configured. Refer to the
Audio Configuration for details.
The number of backup amplifiers is limited
to one per node. Only the first failed
amplifier gets the backup. The distance
from the farthest audio cabinet to the
audio cabinet (which has the backup
amplifier) cannot be greater than four
cable lengths (approximately 208 inches
or 17 feet).
MOTHERBOARD
CONNECTOR
CAPACITORS
XMFR
HEAT SINKHEAT SINK
XMFR
SPEAKER
TERMINALS
RELAYS
MOLEX CONNECTOR
MD-789 MUST BE CONNECTED
ON BOARD HERE TO USE
AMPLIFIER AS A BACKUP
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