[sdiy] Tr-808 issue

Richie Burnett rburnett at richieburnett.co.uk
Fri Sep 14 22:06:26 CEST 2018

> ...Sometimes switching it on and leaving it on for a while it will come to 
> life with the step led blinking sudddenly.
One time I got it to live by plugging a Pedal into the start stop jack. 
Sometimes with the din sync switch but only once or twice.
> ...It’s been months of sometimes, then I thought I fixed it, it worked 
> reliably for weeks, then when I put all the screws back in it didn’t work.

Definitely sounds like a loose connection somewhere or a cracked PCB track 
to me.  If it was due to the UVLO/brown-out circuitry it would either work 
or not work at a particular supply voltage, not work intermittently.

As others have said, I think you're either gonna need an oscilloscope, or to 
hand it over to someone who's got one to find out which signals have gone 
absent when it is in the non-working state.


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