Dead Minnow

[churchmans]

Hello, this is my first post. Probably my 5th pedalpcb build but my first that didn’t work!

Finished a minnow but all I get is a bypassed signal. Blue led flashes for a second while plugging in but after that no leds.

Anything glaring? Any troubleshooting tips?

Thank you in advance for your help!

 

[PJS]

I bought the j201's from guitarpcb.com and the receipt says "guaranteed genuine."

I can't thank you all enough for the help!

That is a reputable source. They almost certainly are what they say they are

 

[churchmans]

If you have voltage on Pin 8 of IC1 but not on IC100 there is likely a damaged trace.

Measure the voltage on Pin 3 of TRIM1 and the positive side of C101.

TRIM1 pin 3 and the positive side of c101 = 9.39

I have to get my idiot variable out of the way: the bottom left corner of the pcb was filed down to fit the enclosure. Only slightly and taking care not to get close to the visible trace. Could this be the culprit? I have to lay that on the table!

 

[Robert]

You could have nicked the trace going to the LED on that side, but even if that was the case it wouldn't cause the other symptoms.

Check for continuity between the positive side of C101 and Pin 1 / 8 of IC100.

 

[churchmans]

phew.
but yeah, no continuity between c101 and 1/8 of ic100.

 

[Robert]

Run a jumper wire between those points, that's where your problem is.

 

[music6000]

Just beat me:
Continuity Check all Red Circles!

 

[churchmans]

Well damn, i added a jumper between those points but still nothing.
the only red circle place I get 9v is the diode.

 

[Robert]

But you still have 9V on the positive side of C101?

 

[churchmans]

Remember I said i'm an idiot?
I had the jumper at the wrong spot.
IT WORKS!
I can't thank you all enough for your help.
Thank you very, very much!

 

[jimilee]

Remember I said i'm an idiot?
I had the jumper at the wrong spot.
IT WORKS!
I can't thank you all enough for your help.
Thank you very, very much!

Those are the hard ones for me to diagnose unless the board is in front of me. I knew something was screwy and reinforcements were needed from the man himself. Glad you got it running.