[sdiy] broken chorus on mks-30

[Jason Proctor]

i found the jx-3p schems easy enough and then cross-referenced the 
chorus chips with bob's site - the BBD chips are mn3009 and mn3101. 
senso has these for E18 and E3 respectively.

ISTR reports of other Roland synths needing replacement BBDs a while 
back? a 5 minute search didn't bring anything obvious up.

either way, parting out a mostly working instrument angers the synth 
gods, so don't do that.


>I pulled my mks-30 out of the closet and found that it is no longer
>working %100. The synth works perfectly until I turn the chorus on.
>With chorus engaged the output is distorted and I hear a loud hum.
>
>I can find schematics for every part of the mks-30 except for the
>power board that has the chorus circuit on it.
>
>Has anyone experienced a simmilar problem and know how to fix this?
>Maybe they have a scan of the schematic?
>
>In exploring the synth which has 6 perfectly working 80017A chips I am
>wondering if this synth is worth more as parts then as a working
>synth? For example the the 80017A chips sell for $60 each x 6 = 360USD
>  while the average mks-30 only sells for about $275.
>
>cheers,
>Danjel
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