Fostex x-18 cassette multitracker recorder, service manual needed!
Unfortunately a power supply transient -when switched on and off- leave this unit dead. After this happened, when you switched on, the motor spins but no signal is passing thru either playing tapes or monitoring inputs. Led VOMs do not work anymore nor indicate signal when playing 4 channel recorded tapes.
I suspect of a component failure at the power supply stage, so a service manual/schematic will be required for repair. Having many tapes and material mixed and recorded I will appreciate to give this piece a chance for revival. It's a wonderful unit and its tape head and transport mechanism are in perfect condition. Attached you'll find the Owner's manual cover as a reference picture.