Kongsberg Seatex AIS 100, Инструкция по эксплуатации

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Seatex AIS 100 Instruction Manual, rev. 5 Troubleshooting
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9 TROUBLESHOOTING
If the initialisation process fails, the alarm LED will turn red. Mobile
station failure can be divided into two categories:
•
Hardware problems
•
External interface problems
9.1 Hardware problems
Hardware problems can be divided into the following categories:
•
Power supply failing
•
GPS receiver failing
•
VHF transceiver failing
•
GPS and VHF antennas and cables
•
Interface cables
9.1.1 Power supply failing
If the lamp PWR on the front of the mobile station does not light
green, the unit does not receive power. First check the fuse in the
connection box. If the fuse is OK, check that external power has been
connected to terminal screws 37 to 40 in the AIS 100 connection box
as stated in section 5.4 and that the supplied power is in accordance
with technical power specifications, section 4.3. If the transponder
outputs an alarm, the alarm condition can be read from the display.
9.1.2 GPS and VHF antenna cable connections
Typical problems when no GPS signal is received is that the GPS
antenna cable and/or connectors are damaged as well as loose or that
the cables are not properly connected. In order to check for antenna
cable problems, ensure that the GPS antenna is disconnected. The
Ohm reading between the centre and the shelf should be infinite if
there is no short-circuit in the cable. Make a short-circuit in the
opposite end of the cable and measure the resistance. Now the reading
should be approximately 0 Ohm.
9.1.3 GPS and VHF antenna malfunction
Disconnect the GPS antenna cable at the rear side of the mobile
station. Measure the resistance between the centre pin and shield in
the cable (with the antenna connected). The GPS antenna does not
have a defined resistance that can be measured. Therefore, before
measurements can be carried out, the antenna end of the cable needs