Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 12-03-2016, 14:36   #1
Registered User

Join Date: Mar 2016
Location: Oshawa Ontario canada
Boat: Grew 18' stern drive
Posts: 2
JRC Radar problem-need help

My Radar model 1000 has given me 484 hours of reliable service but now it has become unresponsive. I have observed the following: The screen lights up, the screen responds when I turn up the sensitivity, the GPS indicators on screen work while connected to my GPS, The wires are all good-have checked with an ohmmeter, the antenna turns, fuses are fine feeds and grounds are ok. Could it be the Magnetron? If so where can I purchase one and how much do they cost? I have the manuals with the basic wiring diagram but no diagram for the circuit board.
__________________

__________________
massey1010 is offline   Reply With Quote
Old 12-03-2016, 16:49   #2
Registered User

Join Date: Jan 2016
Posts: 429
Re: JRC Radar problem-need help

I've got a Mk.II but it's just a spare and it's buried in a locker atm.

Had to replace the scanner connector on the display - both the 10-pin chassis plug and the cable socket. Also had to rework some cracked tracks on the display board nearby. Suspected it would be a common failure because of cable flexing.

Before I found the problem the scanner rotated, screen showed "no signal" or similar after warm-up, first thought was magnetron.

Was a few years back & annoyingly can't remember the make/model of those plugs/sockets but can check back if you need it. They were available but I had to look hard.

I've very limited radar experience because of regulations & safety but don't magnetrons usually fail slowly? Don't know typical life either, sorry.

I'll see if there's a schematic in the manual I found way back then, memory's useless nowadays
__________________

__________________
unclemack is offline   Reply With Quote
Old 12-03-2016, 17:09   #3
Registered User

Join Date: Jan 2016
Posts: 429
Re: JRC Radar problem-need help

Sorry, manual must be on old pooter that's in storage somewhere.

Found this though from member JRC Support to another member:

Please email any questions you have to marineservice"at"jrcamerica.com.

We try to answer all questions the same day if possible
__________________
unclemack is offline   Reply With Quote
Old 12-03-2016, 17:54   #4
Registered User

Join Date: Jan 2016
Posts: 429
Re: JRC Radar problem-need help

JRC 1000 Radar plugs/sockets are made by JAE, they're SRCN series size 16.

uk.farnell.com stock them, Japan Aviation Electronics has a US website.

Posting this in the hope later searches might find it. Had a hell of a job finding them myself.
__________________
unclemack is offline   Reply With Quote
Old 12-03-2016, 18:10   #5
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35 14ft.Whitehall pulling skiff.
Posts: 7,708
Images: 5
Re: JRC Radar problem-need help

I'm afraid I have some bad news for you. It probably is the magnetron. I have the same model. It worked fine all down the cost to Cabo, then started fading out. I would shut it off for awhile and have a few minutes of life, followed by fading out again. Called JRC and told them the symptoms and they told me, probably the magnetron. This was a year ago and they told me they had no more magnetrons since the unit is obsolete.
I was turned onto Richardson electronics Magnetrons and bought their last one as Japan was not making the magnetron anymore. But who knows, give them a try and let us know.
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Old 13-03-2016, 09:58   #6
Registered User

Join Date: Jun 2012
Posts: 6
Re: JRC Radar problem-need help

I have a 1000 MK II also. Went to the service outlet in Seattle a couple of years ago and the service guy helped me with mine and took the very last core off the shelf and exchanged it for mine. No charge. He said all service and parts were discontinued about four year ago. Sorry
__________________
stepsmit is offline   Reply With Quote
Old 13-03-2016, 12:04   #7
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35 14ft.Whitehall pulling skiff.
Posts: 7,708
Images: 5
Re: JRC Radar problem-need help

Quote:
Originally Posted by stepsmit View Post
I have a 1000 MK II also. Went to the service outlet in Seattle a couple of years ago and the service guy helped me with mine and took the very last core off the shelf and exchanged it for mine. No charge. He said all service and parts were discontinued about four year ago. Sorry
When you say core, what are you referring to?
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Old 13-03-2016, 15:49   #8
Registered User
 
deblen's Avatar

Join Date: Oct 2014
Location: Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 1,152
Images: 1
Re: JRC Radar problem-need help

I'm an old ret'd Marine Electronics Tech. The Jrc 1000 came on the market about the time I was retiring,so I never had any personal experience with them. I did replace several of the 1st version (not the JRC 1000 MKII) with Furuno or Koden because the 1000 failed early & comm. fishermen don't/can't waste time on troublesome eqpt.
However,they were probably fine for occasional recreational use. I found that magnetrons don't last as long as 3KW & up in most of the little 1.5 & 2KW radars of all brands in comm. use. Like everything,they are built down to a price.

You need to check one more thing before you call it a defective mag. & that is Tuning.

If you have lighted screen (raster),range rings, that proves the display OK.

If you also have noise speckles on screen on long range,with STC(Sea Clutter) turned OFF,FTC (Rain) turned OFF & Gain turned UP, & a heading flash-your antenna is turning & receiver/IF board in the dome is working. The video coax built into the display to dome cable is also OK. A clean screen with rings but no speckle indicates an open video coax. Note: Turning the Gain up & down should make the speckle come & go.

If you still have no targets & no "fuzzy thick donut" rings in the first mile or less,check the tuning bar graph at top of screen on long range. It should be going up & down some as the antenna turns & hits targets. The closer the target the higher the graph-it is measuring the strength of echos rec'd.
If tuning indicator is low & not fluctuating, you can try manual tuning per your owner/installation manual.

If manual tuning doesn't produce targets it's a good indication mag. is not transmitting. The driver ckt board (Modulator) could be defective but you need a Tech for this. Caution!! 5Kvolts at mag-modulator board will burn a nice deep hole in your poking finger.

Having to manually tune usually means the mag. is getting tired & will soon quit.
Fuzzy donut rings are another indication of a mag. on it's way out.
Turning radar to standby & waiting for a few minutes for mag. heater to cool,& then switching back to transmit will sometimes shock a dying mag. into working for bit but it is dying.
The magnetron is a tube-the last tube still in use probably-& they wear out. They are rated for 1000 hrs but some go much longer though usually at poorer performance-more sea clutter & less distance.

I Googled for a JRC1000 manual/diagram to identify the mag. used but no joy. Lots of MKII manuals but I don't know if mags were the same.

Remove the dome cover & ID the mag.
Here is a x-ref list,but it won't surprise me if it's NA as JRC also make mags & have discontinued others Radar Replacement Guide
JRC built small radars for Raytheon for yrs & some of those are mags are NA.
Best to stick with Furuno or Koden-they build the majority of small radars regardless of whose logo is on them.

I can't recommend you drop $US500 for a new mag for that radar-it is quite a gamble. Shop Ebay.

Cheers/ Len
__________________
My personal experience & humble opinions-feel free to ignore both
deblen is offline   Reply With Quote
Old 13-03-2016, 18:22   #9
Registered User

Join Date: Jan 2016
Posts: 429
Re: JRC Radar problem-need help

Did have a look around earlier, many sources say that the 1000 and 1500 use a magnetron designated M1516 and that they're no longer manufactured.

Bummer
__________________
unclemack is offline   Reply With Quote
Old 28-03-2016, 08:39   #10
Registered User

Join Date: Sep 2014
Posts: 6
Re: JRC Radar problem-need help

Hi,
I have a radar dome left over from my JVC 1000. The control unit stopped working after 4 years and about 5 hours use.
You can have the radar dome cheap. It is practically band new.
cheers, Eric
__________________
sueanderic is offline   Reply With Quote
Old 28-03-2016, 08:49   #11
Registered User

Join Date: Mar 2016
Location: Oshawa Ontario canada
Boat: Grew 18' stern drive
Posts: 2
Re: JRC Radar problem-need help

Cheap sounds great-I'm retired leaving Florida in a few days for home in Toronto where are you located? If you want to go off line I am at murray.russell@sympatico.ca thanks!!
__________________
massey1010 is offline   Reply With Quote
Old 28-03-2016, 14:31   #12
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35 14ft.Whitehall pulling skiff.
Posts: 7,708
Images: 5
Re: JRC Radar problem-need help

I love seeing this...cruiser helping cruiser...
__________________

__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Reply

Tags
radar

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
JRC radar Problem JGomes Challenges 5 05-08-2016 14:15
For Sale: JRC 24-mile RADAR - Display + Dome - JRC RADAR 2000 synchronicity98 Classifieds Archive 5 12-09-2012 07:15
JRC RADAR 1800 Problem JGomes Navigation 0 12-04-2012 10:28
JRC Radar Question CaptPatAg Marine Electronics 4 18-02-2011 06:43
FS: JRC Radar 1500 MkII benjiwoodboat Classifieds Archive 4 19-03-2009 10:59


Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:55.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.