Be VERY Careful!!!!!!! - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-18-2011, 08:47 AM   #1
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Be VERY Careful!!!!!!!

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Thought I'd post a heads-up here about potential HD switch issues.

A while back a bought a batch of HD chargejack style switches here on RCC.
Now I've started using them, I have discovered that the first two I used have problems, and figured that if anyone else was using these switches (as in the first pic) that they should check them REALLY carefully.

The first switch 'leaked' current when in the off position. It took me a while to figure out why my flight batteries were draining over a couple of days, and after much testing & head scratching, found the switch was never quite 'off'!
Yanked it and installed this next switch.

All well for a half dozen flights or so, then my charger goes open circuit the next time I charged the attached flight battery. Checked the battery, it's ok.
Checked the switch - open circuit on the charge jack.

So I pulled it apart, and pic #2 shows what I found. A solder joint that was no longer connected, and two of the wires with cut insulation, almost touching.

We've had a couple of planes at the field go in with 'strange' failures - and they were all using the 'expensive' HD charge jack switches. So perhaps there are more dubious ones out there?

Be warned. Check carefully, it just goes to show, that even when you figure you've put in the best it isn't necessarily so.

I'm just pleased I run dual redundant switch/battery setups!

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Old 10-18-2011, 09:22 AM   #2
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Re: Be VERY Careful!!!!!!!

I've doinked 2 planes this year because of electrical issues. Both were switch related issues, and here I thought the HD switches were better (if they failed, they failed to a closed position). Hmmmm, maybe its time to just plug the battery directly on to the Rx! Or ask the retailers to quit selling junk!

What make of switch was that?

Thanks for the heads up.

Last edited by PurgatorY; 10-18-2011 at 09:40 AM.
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Old 10-18-2011, 02:37 PM   #3
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Re: Be VERY Careful!!!!!!!

I bought some off ebay that look identical to the ones in the photo. I haven't had any electrical problems but they use really cheap materials. The plastic falls apart with the least amount of strain. It's getting hard to find a really reliable switch ! It seems that they are all made in China, with next to no quality control ..
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Old 10-18-2011, 03:39 PM   #4
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Re: Be VERY Careful!!!!!!!

i have had issues with those switches and also mpi switches,when i would check my batteries through the switches i noticed that sometimes the voltage reading i got was like 2.5 volts with a fully charged battery.this had me worried that my battery was no good,after checking my batteries at the deans connector the voltage was good.this had me worried and i changed the switches,i fly giant areobatic planes and i run dual 2300 123,s for redundancy.i kept getting low battery warnings on my radio from my airborne battery packs and after furhter investigatng i found two bad switches.from now on its the best switches for the money and hopefully no issues with low battery voltage.

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Old 10-21-2011, 12:49 AM   #5
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Angry Re: Be VERY Careful!!!!!!!

For what its worth.

I take the switches completely out of the plastic case and solder the brown ground wires to the metal of the switch at both ends. Then double up on the switch contacts for the red wires, the positive contacts as they are only using one side of the slide switch. The broken wire in Mikes switch is the binding wire if plugged into the data port on Spektrum/JR Rx's. I usually cut it off as it enters the switch. Then I put a bit of Goop over the wiring, put the black bottom back on and then sit the switch up right so that it doesn't get into the contacts.

These switches must be put together by Chinese school kids as some of them are terribly put together.

My advice would be to take them apart for inspection or DON'T use them.

Last edited by cloudniner; 10-21-2011 at 06:30 AM.
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Old 10-21-2011, 05:55 AM   #6
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Re: Be VERY Careful!!!!!!!

I will indeed be doing that all from now on Richard - pity to have to, but really silly not to! I was pretty horrified when I opened the switch, removed the black goop and found that only one side of the switch was being used. Really dumb.

And what I didn't highlight on the pic of my switch, was that like the orange wire, the brown wire had also separated from the circuit board - hence the open circuit.

Cheers, Mike
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Old 10-21-2011, 11:50 AM   #7
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Re: Be VERY Careful!!!!!!!

Damn! that is scary crap!

Thanks for the very informative heads-up

I have several of these switches in a few of my "nice" planes. I will definitely be checking them out in the next few days. Good thing the flying season is almost over. This will give me the time to go over all my switches and inspect for the same issue.

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