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check for physical damage to the cables (such as fraying) and for any loose connections
check for water damage to the radiator or to the cables between the radar components
check that the tuning is adjusted correctly
check the magnetron and replace if necessary (see the Service Manual)
check the modulator circuit and replace if necessary (see the Service Manual)
check the receiver circuit and replace if necessary (see the Service Manual)
check for interruptions in the pulse switching signal
If an image appears on the display but the direction of the radar image is not stable:
the direction standard signal (BZ) is being interrupted (see the Service Manual)
check for water damage to the radiator or cables between the radar components.
16.3 If the scanner fails to turn
If the scanner fails to turn, it is possible that there has been a breakdown of either the motor unit
inside the scanner or the safety switch of the scanner unit.
Turn the power OFF and investigate as follows:
1. Visually check for, and remove, any external obstruction.
2. If there is no external obstruction, check that the remote power connections or relay in the
junction box are sound.
3. Check the motor fuse in the radar processor box.
4. Open the scanner dome or array and perform an internal inspection.
5. Check to make sure that nothing is interfering with the motor and gears, is binding, or
preventing the antenna from turning.
6. Check for any disconnected, pinched or broken wires.
7. Check for worn or broken motor brushes.
8. Verify that the scanner cable is correctly pinned, all wires are in the correct locations and the
connectors are correctly locked to the mating connectors on the modulator board.
9. Check the motor and the safety switch and replace any faulty component. (See the Service
Manual for information on replacing the motor or safety switch.)
10. Check the wiring of the interconnection cable between the scanner and the radar processor.
11. Checking these connections is especially important if the installer removed the connectors
for easy routing when installing the scanner cable.
16.4 How to reduce noise and interference
If other electronic equipment on the vessel is being affected by noise interference from the radar,
check that the radar is actually the source of the problem by switching it off, running the other
electronic equipment for a while to see if the noise interference has disappeared, and then switching
the radar on again.
If the radar is causing the noise interference, check that:
Northstar 25 kW Radar Installation Manual
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