iotech at kristiansand.mail.telia.com
Mon Mar 2 03:42:57 CET 1998
I have a Prophet-5 rev 3.3 here with a problem I've never seen before:
The D/A converter feeds one of the oscillators with a wrong control
voltage. By adjusting the osc. frequency on the panel, it sounds as if
one ore more of the MSB's fed to the D/A are stuck for this parameter
only. (Several short repeated scales instead of one continuous.) This
can be verified by looking at the analog bus signal.
All other 9 oscillators are ok.
Every other function on the synth also behaves normally as far as I
The problem is periodic and it seems to be a bad contact somewhere
causing the problem. But I haven't been able to find it.
I've replaced the working ram and resoldered all IC's at the processor
board. I've tried freezing spray. With no success...
Any help appreciated.
More information about the Synth-diy