ensoniq sq80 no output

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ensoniq sq80 no output

Postby rap and country » Tue Nov 12, 2013 3:30 am

i removed a dying battery from my sq80 about a year ago and it was working 100% until that point

it has been sitting unused/untouched for about a year until i finally ordered a replacement which i installed yesterday

i plugged in the keyboard connector backwards :evil: and blew F3 / F4, but have replaced them and now it appears to power up normally

problem now is i am getting zero output, both from the keyboard and external MIDI

MIDI out seems to be working fine

any ideas on what to check?

thanks in advance
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Re: ensoniq sq80 no output

Postby synthparts » Tue Nov 12, 2013 3:39 am

You could have blown the CEM3360 output VCA. Do you have another synth with one you can swap in to check? I have them in stock if you need one...
Vintage Synth Parts - http://www.synthparts.com
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Re: ensoniq sq80 no output

Postby rhino » Tue Nov 12, 2013 4:07 am

Strange thing you might try: unplug and clean both ends of the 4-wire cable from the display board to the mainboard. Reason? the volume is controled by a DC voltage from the volume pot to a stereo VCA in the output. Ensoniq had a real problem with connectors corroding - if there is a poor connection on this cable (which carries the volume and data voltages) - you could loose the volume.
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Re: ensoniq sq80 no output

Postby rap and country » Wed Nov 13, 2013 4:35 am

rhino wrote:Strange thing you might try: unplug and clean both ends of the 4-wire cable from the display board to the mainboard. Reason? the volume is controled by a DC voltage from the volume pot to a stereo VCA in the output. Ensoniq had a real problem with connectors corroding - if there is a poor connection on this cable (which carries the volume and data voltages) - you could loose the volume.


this worked! thanks all
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