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Old 08-24-2012, 08:56 PM #1
Dirty J
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Dm9 - bolt forward and eating batteries

I'm not a DM guy personally, but trying to help a buddy out that has one.

DM9 - shot great at an event a week ago.

Pulled from gearbag to find a dead battery. Replaced the battery and air up to find the bolt being stuck forward. Turned the gun off and put it away.

Came back the next day to mess with it more, to find the battery dead again.

My initial thoughts points to a board short or solenoid issue?

Anyone have any other ideas?
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Old 08-25-2012, 06:05 AM #2
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probably there is a short circuit somewhere.. check if the battery is getting warm after you install it..
you have to have to take out of the list this problem and then if there is still a problem then you can search for it..
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Old 08-25-2012, 09:11 PM #3
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Yes, do check that no wires are exposed or the battery terminals are NOT damaged in any what, or metal is touching on the frame somewhere.

Your bolt being pushed forward is usually caused by a LOW LPR setting. I would suggest turning your LPR in till snug and then turn it out 3 1/2 turns.
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Old 08-25-2012, 09:23 PM #4
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With both symptoms occurring simultaneously after a flawless usage, would the solenoid not be something to check?

If the piston is stuck to the wrong side or not moving freely, that would also cause a bolt forward scenario - no?

I assume the solenoid is only energized while firing the gun. At rest, with no power supply it should be in the bolt "back" position. Is that accurate?

Will check the board/connections for any problems, but with the gun working last weekend and was not taken apart before the malfunction occurred, I don't suspect this will be the issue.

Lpr pressure I will check.

I am very familiar with Bob Long style solenoids. Do DM noids have a "manual" button, to test the non-electrical function of the solenoid?
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Old 09-10-2012, 07:56 AM #5
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Alright, so the bolt forward problem has been solved.

I found that the lpr piston o-ring had a "flap" on it, which allowed proper pressure with some shots, but when the "flap" opened up, was causing excessive drag and thus low lpr pressure.

However the board/battery issue remains. After only an couple hours, a fresh high quality battery goes from just over 9v to totally zapped.

The gun has a Tadao board in it - is this a common issue with them? I found some yellowish-orange crud (best I can describe it) in a few areas on the back of the board, but especially around the battery terminal solder joints. I carefully scraped away a good bit of it, cleaned the board with a q-tip dipped in alcohol and allowed the board to dry.

Powered up, shot great. Come back to the gun about 2 hours later and dead. Install fresh battery, it works. 2 hours later dead.

Any other ideas?
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Old 09-10-2012, 09:26 AM #6
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Its definitely a board issue i'd get in contact with board company and see if they will replace
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