I have a Furuno 1720 radar unit that was functioning perfectly before I took the mast down. When the mast was stepped again, the units displayed all the screens properly but there was no scanning line. No echoes. No nothing but the normal screens on the displays without the scans. The wiring harness appears to be wired correctly.
However, during the stepping of the mast, the marina operators had the mast lift line impinging on the front of the radome while lifting the mast. The stress on the front of the radome flexed the housing in about an inch. After this was noticed, they lowered the mast and the dent came out. Could this mishap be the source of my problem?
I called Furuno and they were no help. The closest dealer only works on powerboats. I thought if anyone on this board was familiar with radars, he/she could offer some indications and maybe I could fix it.
Any ideas?
Thanks,
Ed Haley
s/v Mokita
CD330 #1
Kingston, ONT
eghaleyNOSPAM@twcny.rr.com
Radar Help
Moderator: Jim Walsh
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Mike Thorpe
Re: Radar Help
ED,
I had the same problem this spring. In my case the radar harness that exits at the base of the mast was crimped against the cabin sole.
I found that the signal lead had been severed. If you look at the wiring harnes there are several leads where the braid and the core have been seperated and pieces of wire spliced to them. I don't know if the color code is universal but in my case it was the core where a blue wire had been spliced on. You have to look carefully because this core is about the size of 3 human hairs.
While mine was at the splice located at the base of the mast I assume the same would apply at the Radome end.
Good Luck,
Mike
mthorpe@capecod.net
I had the same problem this spring. In my case the radar harness that exits at the base of the mast was crimped against the cabin sole.
I found that the signal lead had been severed. If you look at the wiring harnes there are several leads where the braid and the core have been seperated and pieces of wire spliced to them. I don't know if the color code is universal but in my case it was the core where a blue wire had been spliced on. You have to look carefully because this core is about the size of 3 human hairs.
While mine was at the splice located at the base of the mast I assume the same would apply at the Radome end.
Good Luck,
Mike
Ed Haley wrote: I have a Furuno 1720 radar unit that was functioning perfectly before I took the mast down. When the mast was stepped again, the units displayed all the screens properly but there was no scanning line. No echoes. No nothing but the normal screens on the displays without the scans. The wiring harness appears to be wired correctly.
However, during the stepping of the mast, the marina operators had the mast lift line impinging on the front of the radome while lifting the mast. The stress on the front of the radome flexed the housing in about an inch. After this was noticed, they lowered the mast and the dent came out. Could this mishap be the source of my problem?
I called Furuno and they were no help. The closest dealer only works on powerboats. I thought if anyone on this board was familiar with radars, he/she could offer some indications and maybe I could fix it.
Any ideas?
Thanks,
Ed Haley
s/v Mokita
CD330 #1
Kingston, ONT
mthorpe@capecod.net
-
Larry DeMers
Re: Radar Help
Hi Ed,
My experience is with a Raytheon RL72, but it may help just the same.
I suspect that the mast-mounted scanner has been disturbed, if not damaged by the launch. The printed circuit board in my Raytheon scanner goes from edge to edge in the dome's lower half, as does the rotating antenna elements. There is very little room for a deflection to occur without something being moved..not necessarily destroyed.
There is a terminal strip inside your scanner unit. The large cable terminates there, usually with spaded lugs, so that the cable can be removed and rerouted as needed. I would bet that your rig is the same as this. That being so, I will suppose that the cable may have been stretched when the scanner was deflected, and that the cable has pulled loose from the terminal strip. This is a relatively simple fix, and should be born entirely by the yard, as someone will need to go up the mast and do the rework. This will not take a genius, but he should be someone familiar with radar interconnects and installations, so to recognize what is normal and what is not. If all else fails, maybe talk a dock neighbor into sharing a beer or two with you, -after the mast has been climbed!
The symptoms tell me that the scanner is still connected or your display would warn that the scanner was not connected. Probably some logic signal is open, and that prevents the startup/warmup sequence.
Check your manual for the basic "No Display" troubleshooting steps if the mast climb provides little joy as to the reasons for the trouble. You may be able to gather an error code fromtheir procedures.
The symptom of the scanner being deflected during launching and the unit not working are quite intimately tied together it would seem. I would not expect that the fix would be too involved as long as the printed circuit board is not cracked from flexing, or the scanner antenna arm not broken or motor burned out due to stalling. Again, it sounds to me that the yard should be billed for the reworking.
Good Luck, and lets hear about the results of this please!
Cheers,
Larry DeMers
s/v DeLaMer
Cape Dory 30 Lake Superior
demers@sgi.com
My experience is with a Raytheon RL72, but it may help just the same.
I suspect that the mast-mounted scanner has been disturbed, if not damaged by the launch. The printed circuit board in my Raytheon scanner goes from edge to edge in the dome's lower half, as does the rotating antenna elements. There is very little room for a deflection to occur without something being moved..not necessarily destroyed.
There is a terminal strip inside your scanner unit. The large cable terminates there, usually with spaded lugs, so that the cable can be removed and rerouted as needed. I would bet that your rig is the same as this. That being so, I will suppose that the cable may have been stretched when the scanner was deflected, and that the cable has pulled loose from the terminal strip. This is a relatively simple fix, and should be born entirely by the yard, as someone will need to go up the mast and do the rework. This will not take a genius, but he should be someone familiar with radar interconnects and installations, so to recognize what is normal and what is not. If all else fails, maybe talk a dock neighbor into sharing a beer or two with you, -after the mast has been climbed!
The symptoms tell me that the scanner is still connected or your display would warn that the scanner was not connected. Probably some logic signal is open, and that prevents the startup/warmup sequence.
Check your manual for the basic "No Display" troubleshooting steps if the mast climb provides little joy as to the reasons for the trouble. You may be able to gather an error code fromtheir procedures.
The symptom of the scanner being deflected during launching and the unit not working are quite intimately tied together it would seem. I would not expect that the fix would be too involved as long as the printed circuit board is not cracked from flexing, or the scanner antenna arm not broken or motor burned out due to stalling. Again, it sounds to me that the yard should be billed for the reworking.
Good Luck, and lets hear about the results of this please!
Cheers,
Larry DeMers
s/v DeLaMer
Cape Dory 30 Lake Superior
Ed Haley wrote: I have a Furuno 1720 radar unit that was functioning perfectly before I took the mast down. When the mast was stepped again, the units displayed all the screens properly but there was no scanning line. No echoes. No nothing but the normal screens on the displays without the scans. The wiring harness appears to be wired correctly.
However, during the stepping of the mast, the marina operators had the mast lift line impinging on the front of the radome while lifting the mast. The stress on the front of the radome flexed the housing in about an inch. After this was noticed, they lowered the mast and the dent came out. Could this mishap be the source of my problem?
I called Furuno and they were no help. The closest dealer only works on powerboats. I thought if anyone on this board was familiar with radars, he/she could offer some indications and maybe I could fix it.
Any ideas?
Thanks,
Ed Haley
s/v Mokita
CD330 #1
Kingston, ONT
demers@sgi.com