Sound is low and some voice not working

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Sound is low and some voice not working

Postby PooLP » May 23rd, '20, 08:00

Hi,

I have a Yocto that I just finished (with a big break of 3 years :)).

I have some problem with it.

On first power up and start seq immediately, on ~first Step the voices have a good volume, after, all voices volume is decreased

Bassdrum, Snare, Rimshot, claves, and handclap do not work (bassdrum ans snare have very low volume)

If i turn clockwise accent Knob, all voices volume decreased

I'm search, but is to hard to find, i have a doubt on BA6110, but I don't think this is the source of all problems.

Here are the pictures, if you see a few things : https://photos.app.goo.gl/oKS8EBhXQ4mAnXuz7

I can't find anything yet.

if there is someone who knows how to repair this machine and who could do it, PM me ;)

Thanks.
PooLP
 
Posts: 9
Joined: Mar 28th, '17, 05:28

Re: Sound is low and some voice not working

Postby PooLP » May 29th, '20, 15:58

nobody for help ?
PooLP
 
Posts: 9
Joined: Mar 28th, '17, 05:28

Re: Sound is low and some voice not working

Postby gihaume » May 30th, '20, 09:19

If you have an old kit you may want to swap the IC in the accent section because some that e-lick sent were defekt.

It seems you have a lot of non working voices. For each, inspect firstly for soldering issues (there is a few spots where pads are very close but shouldn't connect..), then ICs/transistors and polarized parts orientations, then parts/values placement.

I can physically help in Switzerland, otherwise it's too complicated.
gihaume
 
Posts: 288
Joined: May 12th, '14, 14:48

Re: Sound is low and some voice not working

Postby PooLP » Jun 5th, '20, 06:53

Thanks :D . I will test.

I made the noise modification of this site (https://masutopedals.wordpress.com/2016 ... ding-tips/), but the other mods are also to be done or this is just improvements?

There is also this site (https://www.dsl-man.de/display/DSO/Yoct ... ding+tipps) which offers mod / fix, are some of them necessary? (first fix it's ok for me)
PooLP
 
Posts: 9
Joined: Mar 28th, '17, 05:28

Re: Sound is low and some voice not working

Postby PooLP » Jun 5th, '20, 10:27

ok, after replaced Accent CI and all re-checking, all voice work, but :

Bassdrum have only "Attack sound" (no bass) and decay knob don't work.
The handclap sound is fully saturated, BA6110 burned ?
PooLP
 
Posts: 9
Joined: Mar 28th, '17, 05:28

Re: Sound is low and some voice not working

Postby gihaume » Jun 6th, '20, 13:17

For the clap, just change the trimmer setting maybe ? If your BA6110 was burned, I think it most likely wouldn't output any sound (but I am no expert).

For the bassdrum:
- if you have sockets, try to swap U12 with another similar IC
- check C43 value and orientation
- check R170, R164, R169, R168 (absolute) values
gihaume
 
Posts: 288
Joined: May 12th, '14, 14:48


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