[offtopic]
Krakend cutoff-potje vervangen. Leek me geen probleem, ik had eerder al 'n defect LFO LEDje in die bak vervangen zonder complicaties. Ik snap de ballen van electronica maar LEDje eruit, LEDje erin, leek me niet iets om 'm voor naar Duitsland te sturen. Blijkbaar heb ik die tweede keer toch iets aangeraakt wat ik niet had moeten aanraken.
Hier m'n correspondentie met Dieter Doepfer
(The man himself reageert gewoon binnen 24 uur, dat hoorde ik ook al van JohnnyBusca. What a company!)
> I have an MS-404, and I think I broke the ADSR circuitry in some way. It
> happened when I replaced the Cutoff-potentiometer, which had started to
> crackle a bit. I'm no electronics whizz, but I had replaced the LFO2 LED a
> while ago, and that worked fine.
>
> Now, when I turn on the 404, it gives a constant note. Except for the
> Envelope/Gate, everything works fine (LFO's, VCO, VCF). When I hit a note on
> a midi keyboard, the sound drops, but not all the way. Sometimes when I turn
> one of the ADSR pots, the sound cuts out altogether, and doesn't come back
> until I switch the unit off and on.
> When I try to play the 404 from CV/Gate, it tracks the CV fine, but the gate
> just doesn't close.
>
> As I said, I'm no electronics whizz, and I probably shouldn't have tried to
> replace the cutoff pot myself. It sounds to me like I fried an IC that
> controls the ADSR. Is there anything I (or someone else!) can do to fix
> this, or did just turn my cool little monosynth into a rackmount
> distortion/filter unit?
From the distance it is very difficult to find out what happened to the MS-404.
At first I would assume that you broke one of the copper tracks when you
replaced the potentiometer. The integrated circuits are normally not as
sensitive as many people think. But if the copper tracks are OK probably one of
the integrated circuits has become defective. But it is a problem from the
distance to find out which one (probably in the ADSR circuit).
On our web site you will find the complete service manual of the MS-404 if this
would help (click to the MANUALS button at the left side of the page and then to
the link for manuals of devices that are no longer available).
In every case you could send us your MS-404 for repair. In this case please
contact the engineer who is responsible for MS-404 repairs: Roland Mayer
(mailto:technik@doepfer.de).
Best regards
Dieter Doepfer
Doepfer Musikelektronik GmbH
http://www.doepfer.de
email:
hardware@doepfer.de
[/offtopic]
[ontopic]
De distortion is wel lekker!
[/ontopic]