[sdiy] MC-202 clock/sync probs (re: broken mc-202)

[Doug Terrebonne]

Most likely a bad slide pot. Try replacing it. While we're talking about MC-202 probs I've got a couple here with clock/sync issues -

MC-202 #1. Seq won't start from internal or external sync. Also on internal sync with no DIN cables connected the tempo always reads 0 and the tempo dot in the LCD doesn't blink indicating the internal clock is dead. If I connect a 606 to the Sync In the tempo dot does start blinking and corresponds to the 606 tempo but staring the seq on the 606 still won't start the 202.
 
MC-202 #2. Seq starts/stops only with external sync. On internal sync am getting a clock it seems (Tempo can be adjusted and tempo dot in LCD is blinking to the rate) but cannot start or stop the sequencer. The start/stop button works so that's not it. 

Any ideas?

Thanks
Doug

--- On Wed, 7/8/09, Danjel van Tijn <danjel at gmail.com> wrote:
> Just picked up a broken mc-202 with a
> (possibly) minor issue.
> 
> There seems to be a problem with the releases phase of the
> envelope.
> When the R is at 0 everything is fine but when R is at any
> value
> greater than zero it sustains infinitely.
> I am guessing that the R slider forms part of RC timing
> circuit for
> the ADSR so that maybe if it is broken (ie. the
> potentiometer is an
> open circuit) then at any value other than zero (where it
> is shorted
> out) it never a release/discharges.
> 
> Any clues?
> 
> 
> cheers,
> Danjel
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>