Circuit Overview:
Analog subtractive with digital control galore. 12DCO 6 voice.
Service Tips:
Here is a quote from a post in the synth DIY group from Lorne Hammond:
Three options: 1) Have you had it all recalibrated? At Master Edit, Push A, select parameter 52 Push D when you see "52 calibrate", at "ready?" Push Yes. That will do the HFOs, VCF frequency, pulse width, resonance amount and VCA2 levels and give error messages if there are problems: Bad HFO/VCF?RES?VCF **. The ** is the number of the voice that has the problem but it binary. 2) Processor reset. AC power off, push the red store button and hold down while powering up. Display flickers, release store, blank screen and then a display of "00". 3) Power supply okay? Usual caveats about don't get yourself killed, you do know what your doing? Etc. J03 is the power supply connector on the power supply board, you should see thee measurements at the connector: Pin 1 -5 volts ± 200mv Pin 3,4 +5A volts " Pin 5,6 +5B volts " Pin 7,8 +12 volts ±500mv Pin 9,10 -12 volts " And -42 vots tolerance -41v- -45v behind the flourescent display, noncmponent side at the point labelled -42. Lorne in Canada
Parts:
Aside from some of the Curtis chips and maybe CPU I stock everything all the time electronically. I've gotten the chips when needed from other techs or off ebay. Knobs may be difficult to find exact replacement. The switches are available from analogdiehard@att.net I hear.
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