JRC 1000 Mk2 radar doesn't work

[ErikKiekens]

My dear fellow sailormen,
in my newly acquired Dufour the radar doesn't work. When I turn the unit on, a normal screen appears but without any echoes. The previous owner - prior to the sale - explained to me that this was due to the fact that the installer cut the cable and re-connected it as shown on the picture. Do you think this is a viable explanation?
I try to attach pictures
Erik the lucky*******whonowownstheboatofhisdreams

 

[Heckler]

My dear fellow sailormen,
in my newly acquired Dufour the radar doesn't work. When I turn the unit on, a normal screen appears but without any echoes. The previous owner - prior to the sale - explained to me that this was due to the fact that the installer cut the cable and re-connected it as shown on the picture. Do you think this is a viable explanation?
I try to attach pictures
Erik the lucky*******whonowownstheboatofhisdreams

Both my boats have had the cable cut (to facilitate dropping the mast) and joined as yours is. It worked OK. Check your wires are connected properly, most radars have a self check facility, if the scanner isnt working it will tell you.
Stu

 

[NB Willawaw]

Its quite possible.

You need to ensure that the multicore cable between radome and display is jointed at the terminal strip correctly - JRC usually supply an installation manual and the wiring should be there - pay attention to any screening on the cables.

The self test won't normally cover the transceiver in the radome, but correct wiring is the first step.

My dear fellow sailormen,
in my newly acquired Dufour the radar doesn't work. When I turn the unit on, a normal screen appears but without any echoes. The previous owner - prior to the sale - explained to me that this was due to the fact that the installer cut the cable and re-connected it as shown on the picture. Do you think this is a viable explanation?
I try to attach pictures
Erik the lucky*******whonowownstheboatofhisdreams

 

[misterg]

My dear fellow sailormen,
in my newly acquired Dufour the radar doesn't work. When I turn the unit on, a normal screen appears but without any echoes. The previous owner - prior to the sale - explained to me that this was due to the fact that the installer cut the cable and re-connected it as shown on the picture. Do you think this is a viable explanation?
I try to attach pictures
Erik the lucky*******whonowownstheboatofhisdreams

I have the same radar with the cable joined in the same way and it works OK.

Do you have the manual for the radar?

Andy

 

[FullCircle]

Are you sure you are pressing the XMIT button? The radar only works in Standby mode until you press XMIT.
To stop transmitting, press it again, and it goes into Standby.
It does this, as the current draw is high.

There is also an internal fuse of5a I think

There is a (3 minute?) warmup time.. sometmes for some reason the contrast gets adjusted.. have you tried to "increase" the contrast during the warmup time? You should see the countdown timer for warm up...

I have the JRC 1800.


Try sending a PM to |BurnhamBob on here. He had a manual a couple of years ago in PDF format.

 

[Piddy]

I have the same radar with the cable joined in the same way and it works OK.

Do you have the manual for the radar?

Andy

Me too.

I would check all the terminations one by one making sure the coax is connected to its mate. I think (but haven't looked for ages) there may be more than one.

Cheers

Piddy

 

[Icarus39]

I had the same problem on a Furuno unit. I turned out to be the signal line - exactly the same symptoms, no echoes.
From looking at your pic, I would say the signal line is the 4th wire from the left in the plastic tube shield. This wire is extremely fine, what I had to do is get some data wire (RS-232 / cat 5 data wire) and solder it on to the end of each end of the signal wire so you have a nice bridge between the 2 ends of the fine wire. All soldered and heat shrinked. When you next take your mast down you can simply snip the thicker wire and next time you could connect either end to the chock block or solder in a new piece.
Worked a treat for me. I think the signal wire is too fine to go through a strip connector ?

 

[ErikKiekens]

I have the manual but it doesn't help me. The most important element in your replies is that it is not just a matter of replacing the cable. I will have a detailed look at the connections instead.
Thanks for your advice
Erik

 

[Billjratt]

Can you hear the scanner spinning if you press your ear to the mast?
Possibly someone with a working unit could take voltage measuremets at the jointing block to assist you and for their own future reference. (remember to record the settings of all the controls and the meter type as well).