Question about Leupold RX-IV Rangefinder

5 Answers

My Leupold RX-IV rangefinder was completely dead after just laying around in the garage about 1 year. Of course I tried with a new battery but no improvement. Any tips? I am an electronics engineer by trade but I haven't found any obvious way to open it up to have a look.

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  • Johan Blohm Mar 25, 2011

    Thanks for the suggestion Joe and even though it looked very clean and shiny in the battery compartment I followed your advice,,, but NO - still dead! Any other suggestions? The rangefinder still looks like new; no marks or damages or anything.

  • Johan Blohm Mar 28, 2011

    Dear Silverdragon

    Thanks for your reply.

    I have tried to post a long reply to you but this damn web form won't allow it (something about invalid characters). Sorry but I don't buy your theory about exercising components. Any other ideas?
    BR.
    Johan

  • Johan Blohm Mar 31, 2011

    -Cleaning battery compartment poles with an erasor did not help.
    - Replacing capacitors in an almost new unit seem a bit far fetched and have not been accepted as a possible solution. Besides, I have not figured out how to open up the rangefinder yet.
    -Any more suggestions?

  • Johan Blohm Mar 31, 2011

    Any more ideas about how to bring back my rangefinder to life?

  • Johan Blohm Apr 01, 2011

    Thanks for your suggestions. I've already tried cleaning the battery connectors with no success (they looked totally brand new as the rest if the unit). I would love to find a way to open up the rangefinder without damaging it too much but haven't come that far yet. I have been in contact with Leupold adn they suggested to mail it from Sweden -> US for repair and alos gave the alternative to contact a service depot over here. I have tried the later but surpricingly enough I never got a single reply?! I bought it on some US eBay shop some years ago and since I can't seem to find the original receip I'm a bit reluctant to send it off for service that might cost me a fortune. I'm still hoping and waiting for some Leupold Guru to come up with the final solution :)

  • Johan Blohm Apr 01, 2011

    I haven't got any creative suggestions that makes any difference yet. Still hoping and waiting for a Leupold Guru to come up with the final solution.

  • Johan Blohm Apr 07, 2011

    Thanks but where to find the screws; I hope along the edges so that I don't have to rip it all off? Do you know how many to look for?

  • Johan Blohm Apr 26, 2011

    Thanks for the tip mcneb but this is what I already have done over and over HOPING for a wonder. Still dead though.

    I haven't yet managed to open it up but followed some wize guy's advice to remove the rubbery coating to find hidden screws - TOTAL waste of time. Top and bottom is molded in one piece so IF I should open it up, it has to be from the lense side somehow.

  • Johan Blohm May 31, 2011

    I just realysed that I haven't replied to this suggestion: It did NOT work and it is still dead.

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I hope you have not opened it up. Be sure the contacts in the battery compartment are clean. Leave the new battery in for a few days and keep turning it on/off. It may take a bit to fire up the CMOS which losses its memory with out power. Hope this Helps.

Posted on Apr 23, 2011

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The vucalnized covering is removed to access the screws to remove the outer housing

Posted on Apr 07, 2011

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AllI can suggest is that maybe the battery terminals inside the rangefinder are slightly oxidized, and may need a good cleaning. Other than that, you could be having an oxidation problem with the contacts of a switch inside the camera, which will be challenging to get to, as you know. A good contact spray that doesn't harm plastics might help, if you can get to the components. Otherwise, you may have to contact Leopold support (I couldn't find a support center on the net, so refer to your manual that came with it).
Wish I had more, but that's allI can think of, but hope it helps.

Posted on Apr 01, 2011

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Hi, well being a fellow engineer then I am sure you are familiar with the fact that electronics that are NOT powered ON & cycled on/off, at least once a week, or so, well then, certain components will deteriorate, especially capacitors, very quickly over time, many simply may change their values, slightly, or not, and subsequently anything that is critical, say a timing circuit, is soon thrown out of whack, as it were. Internal Batteries if used, leak and may cause problems and so on. Often it is the "Unit" itself, that detects a "Fault" and will shut the unit down, it doesn't even have to be a major fault... but a shut down is a shut down.

I know we all see in the movies someone wipe of the dust from a computer console after a thousand years or so, and power up via the nuclear power supply, and it all jumps to life and they use it to effect the rescue... Well ONLY in the movies.

You see this is why, say, in the military, anything that is in "Moth balls" is routinely run to combat & counter, exactly, this sort of deterioration. Sure there maybe somethings that will survive longer than others but, eventually all will fail over time, if this is not done..

Now what to do? Well usually whenever I have something that's been in storage for a while, I open it up, and look for any big electrolytic caps, (Even surface mount) and replace them "on spec', Inductors must be checked, xtals too, check for any corrosion, leaks from components,.replace any batteries, check all connectors and spray with contact cleaner, sometimes contacts can develop an oxide, that I swear could insulate against a million volts ..lol.. In fact just give it the "Once Over" being particularly finicky about things and replacing anything that is even remotely suspect...

I always then thoroughly warm the entire unit up, first very gently & slowly, (In the oven actually, Sometimes, this actually FIXES it... ) after all is checked, parts replaced etc, and it's up to ambient temperature, I then apply power, via, a Current limited supply, set just above it's max draw, and switch on .. hopefully all is well.. if not well .. i am pretty sure you know what comes then.. yup troubleshooting.....


You really will need to obtain a service and repair manual to be able to effectively repair this unit, if only for those magical "Parts Numbers". & Circuit Diagrams. I have searched, however was unable to locate a copy, perhaps a direct inquiry to Leupold, will yield one, well worth a try.

usually there is a screw hidden under a label or plug, or the like.. and usually they "Clip apart"

www.leupold.com/hunting-and-shooting/resources/faq/ -

What to do if you don't wish to DIY above.

Posted on Mar 26, 2011

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Hello johan...remove the battery and use the eraser end of a common pencil to clean the contacts in the battery compartment. then reinstall the battery. often after sitting for a year, the contacts are corroded enough to cause your symptoms. joe

Posted on Mar 25, 2011

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