Vintage Synth Repair

hello,
many thanks for your helpful reply!
btw, the patchbay/modifications have been checked and
are totally ok, the problem lies somewhere in the PSU
board, or the vco boards.
anyway, i hope that, soon, my modularized SEM will be
fine!
thank you,
best regards,
bakis.





--- WeAreAs1@... wrote:

> 
> In a message dated 8/9/05 1:27:08 AM, Bakis Sirros 
> <synth_freak_2000@...> writes:
> 
> <<he made all the mods but obviously he made a
> mistake(
> a short sircuit occured somewhere during the
> modification works probably) and one(or more?) of
> the
> chips of the SEM board has been broken. the result?
> now, with no patchings at all in the SEM's newly
> added
> patchboard, the lfo constantly modulates the pitch
> of
> both vco's. >>
> 
> You probably do not have a bad chip.  Your problem
> is probably a result of 
> incorrect wiring of the modification.  Your tech
> needs to check his work again, 
> and very carefully.  There is, however, one chip
> that can cause this kind of 
> LFO modulation problem -- It is A23 on the main
> board.  It is an LM3080A IC.  
> Be careful with this chip.  They are very hard to
> find these days.  Again, the 
> chip is probably OK, and your problem is more likely
> due to incorrect wiring.
> 
> Michael Bacich
> 
> 


Bakis Siros
Parallel Worlds / Polariton
Athens-Greece
[Doepfer_a100] group owner
http://www.shimarecords.co.uk
http://www.ward12.com


		
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