12/20/11 888-2595-001 6-7
WARNING: Disconnect primary power prior to servicing.
Section 6 Troubleshooting
ZX Series
PA MODULE
SHUTDOWN alarm
One or more PA modules have shut down. This could be due to several
conditions:
> PA module has been removed from socket. Check module insertion.
> Corresponding PS module has been removed from socket. Check module
insertion.
> PA REVERSE POWER alarm has been reported. Verify by checking red
LEDs behind PA modules. Consult entry on this alarm in
Table 6-3.
> PA TEMPERATURE alarm has been reported. Verify by checking red LEDs
behind PA modules. Consult entry on this alarm in
Table 6-3.
> PA CURRENT alarm has been reported. Verify by checking red LEDs
behind PA modules. Consult entry on this alarm in
Table 6-3.
> DC supply cable(s) from PS module to PA backplane have come loose
during shipment or transmitter maintenance. Switch transmitter off, open rear
door, and inspect red & black DC cables for affected PA module.
It is normal for this alarm to be present when transmitter is switched off.
RF MUTE ACTIVE
alarm
Transmitter is receiving an RF mute command from either pin 8 of rear panel
REMOTE CONTROL connector (ground = mute) or from FlexStar exciter
while switching modes (where applicable).
INTERLOCK LOOP
OPEN alarm
Transmitter external interlock open due to no connectivity between pins 2 and 3
of rear panel REMOTE CONTROL connector on single PA chassis transmitter
or INTERLOCK A-B terminals of remote terminal board in larger model
transmitters. Verify supplied dummy plug with jumper between pins 2 and 3 is
connected to transmitter if new installation of a single PA chassis transmitter or
INTERLOCK A-B pins are jumpered on larger model transmitters. If external
interlock has already been connected to station load, coax switch, or patch
panel, inspect these devices to determine where loop is being broken.
Table 6-2 Controller Board Alarm LEDs
Symptom Cause and Solution
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