Push to talk switch

[larrynimmo]

My pilots push to talk switch has become intermittent...can it be cleaned? Best place to get replacement?

[RLCarter]

Not sure if it can be cleaned, but FWIW if you find a replacement make sure it is a momentary nominally open switch

[Yetti]

2 hours ago, larrynimmo said:

My pilots push to talk switch has become intermittent...can it be cleaned? Best place to get replacement?

My computer is broke.    Oh really can you be a bit more descriptive about "broke"

I have heard it said pictures tell a thousand words.

How do you know it is the switch and not a loose ground?

Does the copilot PTT work?

Maybe it is the ground to the audio panel.  What kind of audio panel do you have.

[N201MKTurbo]

Digikey has the exact replacement. The part number is in the parts manual.

Before you go to all that trouble, spray some contact cleaner down the button shaft and push it a zillion times and see if it gets better.

[Yetti]

42 minutes ago, N201MKTurbo said:

Digikey has the exact replacement. The part number is in the parts manual.

Before you go to all that trouble, spray some contact cleaner down the button shaft and push it a zillion times and see if it gets better.

Contact cleaner has been known to cause cancer in rats in Baltimore

[N201MKTurbo]

1 hour ago, Yetti said:

Contact cleaner has been known to cause cancer in rats in Baltimore

But it works so good at getting that old crusty heroin out of their syringes. 

[Philip France 13]

You can get the replacement at Mouser electronics cost below 10$ per part. I suggest you buy two just in case of issue during mounting. Easy to replace need to be soldered with iron. Philip

 

[thinwing]

Aircraft Spruce

[larrynimmo]

20 hours ago, Yetti said:

My computer is broke.    Oh really can you be a bit more descriptive about "broke"

I have heard it said pictures tell a thousand words.

How do you know it is the switch and not a loose ground?

Does the copilot PTT work?

Maybe it is the ground to the audio panel.  What kind of audio panel do you have.

First off...Copilot PTT works perfectly.  Audio panel is original King, intercom is David Clark.

when you operate the co-pilot side, there is a solid TX on Garmin GTN-650.  When you operate from the pilot side, the TX is intermittent.

[Yetti]

Well then let's go with switch or wiring to the switch.   a $2 contact cleaner can from wallyworld might fix it and won't hurt anything.  Sometimes people can wire in a PTT from the headset so that might be the wiring.  Also take a quick look at the wires coming out of the back of the yoke and make sure someone did not get a foot into them.

[Hank]

When I have problems, it's usually in the jacks. Reach under the panel and make sure the contacts touch the right parts of the plugs.

[skydvrboy]

When mine went intermittent and subsequently failed, it was from the wire being pulled off the terminal and had nothing to do with the switch.  Not saying that is your problem, but I had the same symptoms, so something to check.

[Austintatious]

Is anyone elses PTT as sharp as a needle?  I am about to 3d print a cap to make it less painfull to transmit.

[RLCarter]

1 minute ago, Austintatious said:

Is anyone elses PTT as sharp as a needle?  I am about to 3d print a cap to make it less painful to transmit.

 when the little cap falls off on some of the switches it is a pain, had a Cessna like that, didn't take long to get a replacement installed

[Yetti]

13 minutes ago, Austintatious said:

Is anyone elses PTT as sharp as a needle?  I am about to 3d print a cap to make it less painfull to transmit.

It's designed that way to keep your transmissions brief and to the point.

If it's the itty bitty one you can buy another one and transfer the cap.   Not as fun as 3d printing.

[carusoam]

Plenty of new cap styles to select from, commercially...

There is a thread around here for that... 

It may help to know what switch was used... it may be a standard...

Best regards,

-a-

[N201MKTurbo]

I believe this is the cap for that switch:

http://www.digikey.com/product-detail/en/1825068-1/450-1490-ND/1124249

Here is the switch: MPA106D

http://media.digikey.com/pdf/Data%20Sheets/Tyco%20Electronics%20Alcoswitch%20PDFs/MPAxx6%20Series%20PB%20Switch.pdf

[larrynimmo]

update....replaced switch with no joy....traced out wiring and found wire had fractured just above a solder point where the wire was soldered to the phone jack...and there was a second wire on the phone jack that was down to a single strand and it broke off when I touched it....

[Yetti]

Means you have a PTT wired into the phone jack.   I'd have to look at a diagram, but the extra "ring" is designed to be PTT of a headset.

[larrynimmo]

on my plane two wires go to the PTT...the white wire goes to the power end of the headphones (center) ....the brown wire goes to the jack where the plug in microphone is hooked up.

[DanM]

On 8/2/2019 at 5:49 PM, N201MKTurbo said:

I believe this is the cap for that switch:

http://www.digikey.com/product-detail/en/1825068-1/450-1490-ND/1124249

Here is the switch: MPA106D

http://media.digikey.com/pdf/Data%20Sheets/Tyco%20Electronics%20Alcoswitch%20PDFs/MPAxx6%20Series%20PB%20Switch.pdf

I believe it should be the momentary version: MPA106F, not the "push on/push off" version.  Correct?

[PT20J]

23 minutes ago, DanM said:

I believe it should be the momentary version: MPA106F, not the "push on/push off" version.  Correct?

My M20J uses a Electroswitch SA1RV20 with a SW53AA2 button. Mouser had stock in 2021.