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The life span of the radar depends on its use. There are consumables inside, mainly the Magnetron and the scanner motor assembly, the life of which depend on running hours. The life of Display is high compared to these two. The TR cell is located in the wave path before the receiver(detector/MIC) Most Radars have a menu function for 'Test".
I know this question is very basic, but did you check your gain and clutter settings? That echoes show in short range, disappear, reappear, and are not consistent on long range sounds normal to me. Auto settings sometimes also can get a bit mad, then manula settings makes sense.
If you have no radar targets, go to longest range 24 miles, gain full, rain and sea minimum, do you have noise, if so, need magnetron, if not, need cable from display to dome.
Go to longest range and full Gain
min Rain and Sea Clutter
Do you have speckle?
Yes = Receive OK, Wiring OK,No transmit (magnetron or modulator)
No = Most likely a broken wire
There is a very tiny coax (shielded wire) that is know to lose its' center conductor, which is very delicate
i have a furuno 1700 radar ,when i switch it on it goes to stand by ,when i press the standby button you can see it scanning but no land appears cheers alan
yes the cable should be replaced
if you are lucky, the unit is still OK (display)
Try the new cable, draped across the boat before rigging. If fault exists with new cable, replace system, or find a new display on ebay
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