Have a Lexicon JamMan that requires servicing. When it is plugged in it runs through it's diagnostics then the overload (red) LED comes on and there is no output. The rig has all memory slots filled and all functions appear to be operating correctly. As per Bob's recommendations I have checked the PS caps, Input Jacks and pots which just leaves the Op Amps to check from his list. Is there a test I can perform to locate the problem. I can drive a signal into the input but as I don't have a schematic I am unable to safely trace the signal through the circuit,
I just found the PS schematic and found that the feed should be 9v AC. I then looked at the plug on the back of the JamMan and saw the AC symbol. I changed the PS to AC and it now works like a champ.
Many thanks for all your help.
Mapex Pro M Maple standard, Pearl 800 series cymbal stands, Vex hi hat stand, Pearl P201P double bass pedals, Tama mid level throne, All Zildjian A cymbals, 21" Rock Ride, 18" med thin crash, 16" med thin crash, 10" splash, 14" new beat hi hats.