Audio Amplifier Wiring
96
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 64: 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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