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Stuck sounds from the CS80


 

There is nothing between the SH and M but a wire. Output K1 of SH board is bound to the K input of M11 and an other wire goes from there to the K input of M21. So most certainly, the issue does not follow this path. Try and check the V input of the M boards, the one where the vibrato arrives.

Does the pitch variation really concern all boards (M21 to M28)? If so, could it be a damaged "Detune ch2" slider?

Joachim


 

i just had EXACTLY the same problem after a blown fuse due to a bad diode ... by the time i got the PS fixed up I have a constant stuck note with a little LFO on it -frequency is controlled by the LFO slider ... most other panel controls seem to be working too ... I found THIS page on Old Crow's site and it sounded exactly like the? problem - so i tried changing out the chips on my SH board and STILL the same effect ...

one thing i DO notice however is that the 4016 chip is 'full on' ... each pin is at max. voltage - 15v through the Vcc pin and 8.6v through everything else ... so i guess that explains the stuck notes ... but I'm a bit a bit of a loss to explain WHY this is ...

ANYONE?


 

Are your TSB boards rebuilt? Just a guess...