Vintage Synth Repair

Sounds very familiar to me. Sounds to me like the back-up memory battery
has gone south. Backup battery is soldered to the main cpu PCB. Should
measure at least 2.8 volts dc. When the battery goes south, miscellaneous
data appears in the ram such that all your patches are playing with the
control
knobs in various bizarre settings.
Try this-go into the manual mode-then set-up a patch from scratch. if a
sound appears then i'll betcha your battery is history. Note that merely
replacing the battery will not restore your sounds. You will have to as well
reprogram the beast. Good luck and au reservoir. Russ
>> 
>> hi there!
>> 
>> i´ve got a rev3 in great cosmetical shape. i keep it in a studio and
>> i´ve never taken it on a gig... one day it broke down and now it
> only 
>> makes funny noises when i play. just noise and weird modulated
> stuff!
>> has anyone out there got an idea of what can be going on!!?!? is
>> there anythig i can try before i get i serviced!?!?!??? also when
>> it´s functioning "normaly" the led flashes a little bit when i turn
>> the knobs and the filtersweeps sounds a bit stepped when i use the
>> button!!! is that normal?!??
>> 
>> cheers! and thanks!
>> 
>> Daniel
> 
> I think LED's flash due to the main Z80 proceesor not having enough
> grunt.
> 
> Filter sweeps sound stepped in the Prophet due to their settings
> being held in digital memory,it's one of my main complaints with the
> Prophet.
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> Yahoo! Groups Links
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