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Vintage Synth Repair

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Ensoniq VFX- keyboard calibration

2010-03-30 by eons

Hi,
I have this VFX to check
At first is calibrates keyboard and works ok
After about 1 hour sometimes keyboard doesn't operate (but not always)
Then switching item off and back on it sometimes wouldn't want to calibrate the keyboard and gives error
Anyone knows of any known issues with the ICs on the board under the keyboard?
Maybe a thermally faulty IC?
Have seen to possibe dry joints.
Any help please, suggestions?
;
Thanks,
eons

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