Soldering done, nearly there, slight sequencer issue

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Soldering done, nearly there, slight sequencer issue

Postby cablebasher » Apr 11th, '18, 19:05

Dudes

So all the soldering is done and she’s in the metal case. Hooray.

A slight (?) issue....

The start/stop button doesn’t do anything.

However step 9 (CB) acts as a start stop button. I can start/stop patterns by pressing step 9.

Most other things seem to work sequencer wise and all the sounds work.

Oh, and the roll, mute and scale buttons don’t do anything. The 6 leds work but no action on the buttons.

I was thinking a soldering short as start/stop ,roll, mute and scale are all next to each other but that wouldn’t explain step 9 acting as start stop.

Any ideas?

Thanks as always.
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Re: Soldering done, nearly there, slight sequencer issue

Postby gihaume » Apr 12th, '18, 04:07

Yeah... sequencer issues are always weird and pretty unknown. That's very likely that none can help you with the behavior described. Just check solder points, shorts and/or forgot parts again and again.
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Re: Soldering done, nearly there, slight sequencer issue

Postby cablebasher » Apr 17th, '18, 06:50

Hey man

Thanks for info.

Yeah once you enter the digital domain electronics gets a lot more complicated!

I did however get it fixed. I found on the schematic that all the things that didn’t work (start/stop, mute, roll, scale) were all controlled by IC7.

I swapped the IC but no difference so I did a continuity test and found one of the IC socket legs was broken.

Fixed that and it all works!

Well almost.

I notice the start/stop button double presses a lot.

Anyone else experienced this?

Any ideas.
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Re: Soldering done, nearly there, slight sequencer issue

Postby jeroenbvo » Apr 18th, '18, 12:55

What do you mean by double pressing? It has bounce?
Put a capacitor <1000pF to ground over the contacts.

I had an encoder doing that on the Nava, the caps solved it. See my post here: http://www.e-licktronic.com/forum/viewtopic.php?f=24&t=1005
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Re: Soldering done, nearly there, slight sequencer issue

Postby cablebasher » Apr 20th, '18, 12:32

Yes the start/stop is bouncing.

Do you have a photo of your nava with the cap fix installed?

Which is the 4 contacts in the button do I put the cap across?

Once that’s sorted I’m done!!!
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Re: Soldering done, nearly there, slight sequencer issue

Postby jeroenbvo » Apr 23rd, '18, 11:11

Hi,

Switch S17 has only 2 of its 4 pins connected. Looking at the schematics I see the shift register is normally held low to ground. Pushing the switch makes it high.
Just bridge the contacts 1 and 3 with a ceramic or film capacitor <1nF.
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Re: Soldering done, nearly there, slight sequencer issue

Postby jeroenbvo » May 8th, '18, 10:11

** Bump **

Curious to know if it worked out for you?
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Re: Soldering done, nearly there, slight sequencer issue

Postby cablebasher » May 9th, '18, 10:39

Hey man

Sorry for he late reply.

I decided to leave it a few days as I didn’t want to open it up again.

It now seems fixed without me doing anything.

It’s weird, for the first few days every time i pressed start it doubled or triple pressed and now it works perfectly ever time.

I guess it just needed a few presses to iron itself out???

Thanks for the advice thought.
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Re: Soldering done, nearly there, slight sequencer issue

Postby neevamerk » Aug 20th, '19, 09:00

Thank you for advice. I also faced same slight sequencer issue while soldering.
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