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3-18
Setup and Operation
If a problem is suspected, the LED visible on top of the transponder is useful in troubleshooting.
During normal operations, it indicates the following:
The LED illuminates when the module is powered up
A flashing LED indicates two-way communication with the LL-CU control unit
A dark LED indicates loss of communication or power
Table 3-5 lists some common problems and possible solutions:
Table 3-5
Common problems
Fault/Indication
LED is off
LED is lit but not flashing
Spurious tamper alarms are
occurring
If problems persist, call for help or return the unit for repair using the instructions provided in
the documents associated with the LL-SG1-*/* transponder.
Cleaning the Optical Connectors
The design of the SG1000 optical connector interface enables you to easily clean the connectors
without removing the optical modules from the node.
DANGER!
The SG1000 contains a class IIIb laser. Do not look into the optical connector of the transmitter with power applied.
Laser output is invisible and eye damage can result.
To clean the optical connectors on the optics modules:
1
Remove the modules' optical connector from the bulkhead adapter located on the fiber tray
as illustrated in Figure 4-7.
2
Carefully clean the optical connector using a suitable optical connector cleaning kit. If a
cleaning kit is not available, wipe the end of the connector using pure isopropyl alcohol
(99%) and a lint-free wipe. Dry it with filtered compressed air. You can also clean the
bulkhead adapter with the same compressed air.
3
Reconnect the module's optical connector into the same bulkhead adapter from which it was
removed. The fiber tray is marked to assist you in making the proper connections.
SG1000 Split Third Port Installation and Operation Manual
Check/Suggested Action
Check the input power to the receiver.
Check the amplifier fuses and circuit breakers.
This indicates that there is no communication with the control system.
Check for proper installation of the control system.
Verify that the RF levels are correct and that there are no interfering
signals.
Check for a malfunctioning photo-optic diode.
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