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vlf/tr deepseeker coin hunter ads 5.5,no audio speaker or earphones.replaced audio output mpsu45 but no change.all diodes,transistors,resistors & caps check ok.solder & traces look good.can't check ic's except by replacing with known good ones.downloaded schematic but it gives no voltages.can find no audio with signal tracer.seems to be detecting ok as needle swings when metal is brought close to coil.can inject audio at base of 2n3906 & i get audio at speaker.i do consumer electronics repair but do not normally work on this type electronics.if anyone has tips or a schemo with voltages it would be very helpful.other wise all i can do from this point is throw ic's at it.george