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Sequencer stopped working, suggestions?
Moderators: Altitude, adafruit_support_bill, adafruit, phono, mome rath

Re: Sequencer stopped working, suggestions?

by ebbflo on Sat Sep 22, 2012 7:02 pm

I checked again

pretty much the same, I think it may have hit 0.066, then drifts down to 0.02

you mentioned the decay knob so I turned it while measuring and saw 0.2v while turning
ebbflo
 
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Re: Sequencer stopped working, suggestions?

by MMM on Sat Sep 22, 2012 7:13 pm

OK. Perhaps your multimeter is reacting a bit slow.

Let's try another approach.

Please measure the voltage (against ground) on the middle pin of Q37, both when playing a note and without.
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Re: Sequencer stopped working, suggestions?

by ebbflo on Sat Sep 22, 2012 7:27 pm

when not playing a note i get 1.15
when playing a note I get 1.24
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Re: Sequencer stopped working, suggestions?

by MMM on Sat Sep 22, 2012 7:35 pm

There's a problem somewhere here.

Please check both side of R146 against ground (again, both playing a note and not playing a note).

I'll probably answer tomorrow; it's way past midnight over here.
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Re: Sequencer stopped working, suggestions?

by ebbflo on Sat Sep 22, 2012 9:44 pm

south side of r146: 0.02 trigger off, 4.87 trigger on
north side of r146: 2.31 trigger off, 2.67 trigger on

I really appreciate your time,
Best
ebbflo
 
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Re: Sequencer stopped working, suggestions?

by MMM on Sun Sep 23, 2012 6:31 am

Please remove Q37 and measure the voltage from the middle solder pad to ground.
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Re: Sequencer stopped working, suggestions?

by ebbflo on Sun Sep 23, 2012 6:50 am

I get 11.7 v from the center pad of q37 with it removed

no change when trigger is depressed
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Re: Sequencer stopped working, suggestions?

by MMM on Sun Sep 23, 2012 7:01 am

ebbflo wrote:I get 11.7 v from the center pad of q37 with it removed


Please use another 2SC536 for Q37. If you don't have a spare one you could temporarily use Q50 from the IO board (you'll not have any MIDI in functionality without Q50, though).
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Re: Sequencer stopped working, suggestions?

by ebbflo on Sun Sep 23, 2012 7:25 am

awesome, thanks chief.
That did the trick,
I had several 2SC536 to spare.
Tested all controls, played notes, sequences, etc...

let me know if I can return a favor, neil@ebbflo.com

best,
neil
ebbflo
 
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