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Posted: 11/19/2010 12:16:36 PM EDT
| So after the incident with my D300-ms I took the tube out and sold the housing. I then took the cash from the sale plus extra to buy a sightowl unit with brand new tube. This unit is sweet but it is the first time I have been able to use the J-arm the way it was designed to be used. I am trying to figure out how to check the auto off function of the jarm. The thing apears to just have two connectors and a wire run into the inside of it. However, there is no connector from the Jarm to the rino arm. How does it work, is there a switch of some sort that cuts off when it is upside down? I dont even know if this is a real Jarm. I got it off ebay and it could be broke or airsoft for all I know. Thanks. |
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Quoted:
Aha, I see the box. So one or both is missing a magnet. Makes sense. I am sure I can fix this now. At least it fails in the on position. Thanks. Don't beat yourself up over this Koga. I have read and heard that it just did not work on some scopes. More then one dealer has told me some seemed to be wired different. Sometimes it is just a cheap aftermarket J arm problem. With a little trial and error you can sort it out but the scope itself must be compatible with this. I use a $500 buck Norotos Titanium mount and my auto shutoff does not work on my 14. I never use it anyhow and always turn it off manually. I am sure I could track down the issue but it is just not high on my list of things to do because I never use that feature. I like to know 100% it is off when I flip it up. That is why I do it manually. I don't kick down doors for a living so my method works great for me. Others may need the feature. Many times the issue is the J arm itself. Lots of cheap Chinese J arms floating around. Try a new one and see if it solves your problem |
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PRINCIPLE OF OPERATION:
The J-arm has a Normally Open contacts magnetically-operated switch in it. The Rhino arm has a moveable magnet in it that when in the mainly horizontal orientation moves so as to Close the contacts of the J-arm switch. When the Rhino arm is in the mainly vertical orientation, the magnet moves such that the contacts of the J-arm will open. The PVS-14 circuitry works such that when the device is powered up with continuity between its two terminals the auto-off function is "armed". When continuity is opened on the two terminals after being armed, the device auto-shuts off. If the PVS-14 is powered up without continuity between its two terminals, and continuity is subsequently established, it will also auto-shut-off. PRACTICAL FUNCTIONALITY: If the PVS-14 is mounted to the J-arm, and the J-arm is inserted into the Rhino arm in the mainly horizontal orientation, and the PVS-14 is subsequently powered up, it will remain on until: 1)The assembly is rotated to a mainly vertical orientation. 2)The J-arm/PVS-14 is removed from the Rhino arm. 3)The PVS-14 is removed from the J-arm. If the PVS-14 is mounted to the J-arm, but the J-arm is not inserted into the Rhino arm, and the PVS-14 is powered up, it will remain on until: 1)Inserted into the Rhino arm in the mainly horizontal orientation. 2)Inserted into the Rhino arm in the mainly vertical orientation, and subsequently flipped to the mainly horizontal orientation. If the PVS-14 is powered up separately from the J-arm/Rhino arm, it will remain on until: 1)Being connected to the J-arm/Rhino arm combination in the mainly horizontal orientation. 2)Being connected to the J-arm/Rhino arm combination in the mainly vertical orientation, and subsequently being flipped down to the mainly horizontal orientation. In any case, whenever the auto-shut off feature is activated, the PVS-14 must be “reset” to come back on by rotating the power switch CCW and then CW. TESTING EACH COMPONENT: The only tools required to test the functionality of each component of the system are a simple electrical continuity meter and a common paper clip opened up into a “U-shaped” configuration to short the terminals of the PVS-14; a short piece of wire will also work, but the stiffness of the paper clip helps, unless one happens to have three hands. 1)J-arm – The J-arm should not have continuity between its two terminals when tested separately from the Rhino arm and PVS-14. 2)J-arm/Rhino arm – The J-arm/Rhino arm combination should have continuity when held is the mainly horizontal orientation. The J-arm/Rhino arm should not have continuity when held in the mainly vertical orientation. 3)PVS-14 – a.Without the device mounted to the J-arm, power it up and verify that it is on. Short the two terminals with the modified paper clip; it should shut off. b.Without the device mounted to the J-arm, simultaneously power it up with the modified paper clip shorting the two terminals; it should stay powered up. Remove the paper clip and it should shut off. Hopefully this helps with your troubleshooting. 
ETA: ADDITIONAL TESTING OPTIONS: 1) Mount the J-arm to the PVS-14. Hold a standard magnet at the back of the J-arm when powering up. When the magnet is removed, the device should auto-shut off. 2) Mount the J-arm to the PVS-14. Power up the device. When a standard magnet gets close to the back of the J-arm, the device should auto-shut-off. 3) Pass a standard magnet near the "black box" on the Rhino arm; one should hear the internal magnet "click" as it moves back and forth within the housing. |
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