User's Manual

Manual 7-9386-1 Page 20TX RX Systems Inc. 09/30/04
61-68-50 UserMan page 20 of 25
verify that DC power is flowing properly. Check
all hardware for tightness.
3) Compare system performance to initial perfor-
mance levels measured when the system was
first installed. The lack of signal can be traced to
a malfunctioning amplifier by progressive signal
monitoring from the output (far end) to the input
end of the system noting the area where the
signal returns to normal level. The next amplifier
toward the output end of the system will proba-
bly be the one that failed.
or
Measure the gain at any convenient frequency
in the working frequency band to verify that the
performance is still within specifications.
Power Amplifier Replacement
The SB II power amplifiers are field replaceable.
Follow the steps listed below in sequential order.
The required tools are a #1 Phillips screwdriver
and a 5/16 open-ended wrench.
Figure 10
: Remove 14 mounting screws to detach amplifier assembly from cabinet.
Remove Screws
Remove Screws
Remove
Screws
Remove
Screws
Figure 11
: Slide amplifier towards bottom of cabi-
net to remove upper cable.