GAI-Tronics 7245-003 24 V DC Remote Subset Amplifier Enclosure - Manual (Page 8)

Pub. 42004-261F
Model 7245-003 24 V DC Remote Subset Amplifier Enclosure Page 8 of 11
f:\standard ioms - current release\42004 instr. manuals\42004-261f.doc
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3. Using the No. 10440-003 Maintenance Cable, plug the amplifier into the connector in the enclosure.
Check, and if necessary, adjust the amplifier to maximize performance.
4. Reinstall the amplifier in the enclosure. Ensure that all gaskets and hardware are in place. Failure to
install the gaskets, which also act as spacers, can result in damage to the connectors on the amplifiers
and inside the enclosures and can cause system faults.
It may become necessary to re-terminate some or all of the enclosures in a system. If so, strip the wires
back to clean copper and connect only one wire to each connector to allow for easier future
troubleshooting.
Troubleshooting
The following table lists some hints to aid technicians in troubleshooting.
Problem Solution
Feedback
occurs only
during page. 1. If a speaker is close to the station, try using the muting feature in the amplifier
enclosure at the terminal blocks. Connect the violet wire at TB1-8 to TB1-7.
Refer to the wiring diagram.
2. Ensure that speakers attached to other stations located nearby are not pointed in
your direction. If changing the orientation of the other speakers has no effect,
mutual muting may be required. Mutual muting silences all the speakers within
proximity to the affected stations during a page from any one of the mutually
muted stations.
Connect the orange wire (spare) to the TB1-7 of all the stations to be mutually
muted. N
OTE : If too many stations are selected, paging coverage can be
adversely affected.
3. Check line terminations at the line balance assembly. Line balance assembly
connections are critical.
Remote subset
is inoperable.  Verify that the connector of the remote subset is securely connected to the subset
receptacle of the enclosure.
 Remove the amplifier from the enclosure. Re-install the amplifier ensuring the
enclosure connector and the amplifier connector are aligned properly.
Crosstalk
occurs. One or more system cable pairs may be improperly terminated. Visually inspect the
system cable connections for accidental crossing of the cable pairs or grounds.