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Author Topic: AimTrack with recoil - Failed MOSFETs?  (Read 343 times)

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p4lmore

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AimTrack with recoil - Failed MOSFETs?
« on: August 30, 2017, 05:04:06 pm »
A few months ago I had a storm roll through and a resulting power flicker had caused my MAME cab to reset.(surge protected).

Yet upon power on I noticed one of my Aimtrack reoil light guns clicking. I looked inside the cab and saw its power brick's LED flickering (36v).
I chalked this up to a typical failure and just opted to replace the power brick. (At the time the other gun had no issues).
When the new brick came I hooked it up, and same flickering LED and light clicking coming from the light gun, so I hooked the new power brick up to the other light gun... Now it began to flicker and the second light gun was making a clicking noise.

At this point I decided to pull them apart and break out the multi-meter. While probing around I happened to notice the MOSFET was extremely HOT so I pulled it from the board to get its part number etc and replace them.

I did after, check all my 36v PSUs with my multi meter and they all checked out (no real load on them of course).

So I'm leaning towards the MOSFETs. The only problem I am having is locating the part.

FQP33N10 with E38 in the top right corner.

I can't seem to find a spec sheet on these, or even a direct replacement part.

Where can I source a replacement or what is an available replacement that I can grab from digikey or otherwise?

I did order a set of FQP33N10 G43 (tested, recoil did not function) and some FQP33N10 J44 (not yet tested).

Or am I even barking up the right tree with replacing this part?


Thank you

(edit. I have replaced the MOSFETs with both options I purchased, and still no go. I can hear a slight *click* very slight, when I run the test function from the Aimtrak application. It may be time to break out the multimeter again and see where voltage is going next)

Titchgamer

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Re: AimTrack with recoil - Failed MOSFETs?
« Reply #1 on: August 30, 2017, 05:56:09 pm »
Have you contacted Andy @ ultimarc regarding this?

p4lmore

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Re: AimTrack with recoil - Failed MOSFETs?
« Reply #2 on: August 30, 2017, 06:32:45 pm »
Yeah, I sent Andy an email a few weeks ago and followed up originally with a post on MAMEWorlds Ultimarc Forums.
I haven't seen any replies on either venue yet, so hoping someone may have an idea here =)

AndyWarne

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Re: AimTrack with recoil - Failed MOSFETs?
« Reply #3 on: September 01, 2017, 06:04:51 pm »
Yeah, I sent Andy an email a few weeks ago and followed up originally with a post on MAMEWorlds Ultimarc Forums.
I haven't seen any replies on either venue yet, so hoping someone may have an idea here =)

If we received an email of this type I would definitely have replied. So I can only conclude that the email didnt reach us for some reason. We can help with repair or replacement. The Mosfet is a 33N10 though.

Can you re-send the email?

lilshawn

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Re: AimTrack with recoil - Failed MOSFETs?
« Reply #4 on: September 02, 2017, 12:18:06 am »
the part number FQP33N10 is correct.

http://ca.mouser.com/ProductDetail/ON-Semiconductor/FQP33N10/?qs=%2fha2pyFadugbZxBPuJnUUry2Ernq%252bU3GQT8YhQXT0Hw%3d

the extra number you have (E38) is just going to be a lot/date code not relevant to its performance.

p4lmore

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Re: AimTrack with recoil - Failed MOSFETs?
« Reply #5 on: September 02, 2017, 12:33:03 am »
Yeah, I sent Andy an email a few weeks ago and followed up originally with a post on MAMEWorlds Ultimarc Forums.
I haven't seen any replies on either venue yet, so hoping someone may have an idea here =)

If we received an email of this type I would definitely have replied. So I can only conclude that the email didnt reach us for some reason. We can help with repair or replacement. The Mosfet is a 33N10 though.

Can you re-send the email?

No worries at all but, it came from my hosted email, so most likely caught up in a filter or otherwise somewhere, I'll re-email from my gmail.
The guns I picked up from an eBay seller with the recoil kits added, at the start of this year (when I rebuilt my arcade with my income tax return lol) and since it happened during a storm, wasn't sure it would be viable for a replacement.

I will say, I've replaced the MOSFETs in 1 and still no joy, though the original ones had turned somewhat brown and when powered got EXTREMELY hot to touch.

Either way, I'll shoot you a line.

Thank you very very much, I love your products and I've always had amazing service.

Thank you.

lilshawn

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Re: AimTrack with recoil - Failed MOSFETs?
« Reply #6 on: September 02, 2017, 01:31:02 am »
I'd be looking upstream at whatever is switching on the FET. sounds like it's getting held on partially. if it was on 100% the coil would fire and the fet would likely burn up in a flame ball within a matter of 30 seconds.

i'd suspect a snubber diode and/or a pre-drive transistor.

p4lmore

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Re: AimTrack with recoil - Failed MOSFETs?
« Reply #7 on: September 02, 2017, 12:18:57 pm »
I'd be looking upstream at whatever is switching on the FET. sounds like it's getting held on partially. if it was on 100% the coil would fire and the fet would likely burn up in a flame ball within a matter of 30 seconds.

i'd suspect a snubber diode and/or a pre-drive transistor.

Awesome, thank you!

I haven't had a chance to power them back up and take the meter to them yet. I've only begun work on one thus far, the other is still untouched.

I will say, when I first hooked them up, the actuator would click repeatedly (and very rapidly). When I first looked at the fets they were HOT, I mean I brushed my finger across it and burnt it bad. The metal on the FET is actually discolored from the heat. Hence the first inclination to replace those.

Hopefully this weekend I can find some time to probe around abit and see, but sounds like I need to start on the higher voltage out side of the MOSTFET with my probe and start checking the diodes etc up to the linear actuator eh?



Thank you

  
 

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