Lexicon lxp-1 signal overload light solid red

[focusbob]

I recently received a broken lexicon lxp-1. Upon power on, regardless of what is plugged in or the settings, the red "signal overload" led is solid at all times. In most settings I get no output. If I crank the input, I get a heavily gated and distorted square wave like signal (pitched to the note I am playing). I tried all of the self diagnostic tests in the service manual and factory reset the settings without luck. Any ideas?

[Enzo]

Like anything else. nothing works right unless it has good power, so assuming 15v rails or at least 12v rails, do you have both polarities at the ICs?

[The Dude]

^^^^^^^^ Yes, that. If you are missing a rail, op amp will likely have a DC content on its output that will keep the LED on.

[g1]

Basic DC supply voltages are listed on pg.13 of attached service manual pdf.

[focusbob]

Thank you to all! As you probably have gathered, my knowledge and skills are very basic. I'm also very slow, but I'll be back!