Mini KoT no LED

[Jbanks]

I’ve finished the mini KoT and it sounds great but I can’t get the right LED to work. I’ve pulled it out of the enclosure and am testing just the board plugged in. Replaced the LED and no luck. The 4k7 LDR seems to look fine. Any thoughts on what gives?

Thanks in advance!
James

 

[pbrommer]

Honest question: did you try flipping the leads? I always seem to screw up the legs for the LEDs at least 1 out of every 3ish builds.

 

[Jbanks]

Yeah I flipped the new LED just to double check and no luck.

 

[PJS]

Check continuity on the switch. It doesn't really take all that much heat to damage a stomp switch

 

[Jbanks]

Ok. I’ll try replacing the 3pdt and daughter board.

 

[Erik S]

Check continuity

Ok. I’ll try replacing

Or maybe just check continuity like PJS suggested...

Jumping to replacement without verification of a failure is as likely to cause problems as solve them.

If you're not familiar with how to do that, this would be a good place to ask/ search for a post that explains the process.

 

[genXslacker]

It's usually best to diagnose the problem before trying to correct it.

Definitely check the continuity of the switch before you desolder anything else.

 

[Jbanks]

Very good point. Ok, how do I check continuity between the 3pdt and the LED? I’m assuming one point goes to the anode (+) side of the LED lug and one goes to a 3pdt lug? It looks like LUG 3 on a 3pdt is usually the LED signal? I’m using a PedalPCB daughter board too.

Thanks
James

Check continuity on the switch. It doesn't really take all that much heat to damage a stomp switch

 

[genXslacker]

Very good point. Ok, how do I check continuity between the 3pdt and the LED? I’m assuming one point goes to the anode (+) side of the LED lug and one goes to a 3pdt lug? It looks like LUG 3 on a 3pdt is usually the LED signal? I’m using a PedalPCB daughter board too.

Thanks
James

Check the switch first. Get your digital multimeter and put it in continuity mode. It usually has a little icon on it that indicates that it is going to make noise when it detects continuity.



In the on state:

There should be continuity between lugs 1 and 2, and they should not have continuity with lug 3.
There should be continuity between lugs 4 and 5, and they should not have continuity with lug 6.
There should be continuity between lugs 7 and 8, and they should not have continuity with lug 9.

In the bypass state:

There should be continuity between lugs 2 and 3, and they should not have continuity with lug 1.
There should be continuity between lugs 5 and 6, and they should not have continuity with lug 4.
There should be continuity between lugs 8 and 9, and they should not have continuity with lug 7.