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 Forum index » Instruments and Equipment » General Discussion
Roland MKS-80 lower voice problem
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dancelwerk



Joined: Aug 28, 2009
Posts: 55
Location: spain Canary islands
Audio files: 2

PostPosted: Sat Jun 01, 2013 8:02 am    Post subject: Roland MKS-80 lower voice problem Reply with quote  Mark this post and the followings unread

Hi to all,I am
experimenting a problem in two voices of the lower part of my Mks80, I describe the issues:

I put the synth in dual mode, Lower 100% Upper 0%.

I choose Poly 2 in Lower section.

When I play one note, with the Vco mixer 50%, the first voice of the sound like if were transposed 5 or 6 octave down, but all parameters works, vco, filter, adsr, lfo, etc, but if i choose the PWM wave in VCO1 or VCO2 not sounds nothing, others waveforms sounds, in octave down, but sounds.

When I play a second note (with first note holded and in the poly 2 too) this second voice of lower part, sounds perfect in the correct transpose, and all parameters works, filter, etc, but Pwm doesn't works.

The other two voices and Upper section works perfect.

What Ics or parts should I check?

Thanks in advance.

Fernando.
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dancelwerk



Joined: Aug 28, 2009
Posts: 55
Location: spain Canary islands
Audio files: 2

PostPosted: Sat Jun 01, 2013 8:10 am    Post subject: Reply with quote  Mark this post and the followings unread

I forget to mention that when I open the unit i notice the Ic 20 of Lower Part (TL064), was replaced for an LM324, not for me, in fact this IC is not a J-Fet Op Amp, i buy with this problem to view to repair in the future, the future is now......

I will replace for the original but perhaps there is obsolette, which one could I use instead?

Fernando.
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dancelwerk



Joined: Aug 28, 2009
Posts: 55
Location: spain Canary islands
Audio files: 2

PostPosted: Sat Jun 01, 2013 8:26 am    Post subject: Reply with quote  Mark this post and the followings unread

My serial number is 673676, rev. 5, I think.
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