MTX Road thunder 4340

[Dr Zeus]

Ive got this one on the bench today which powers, idles at 0.45A. Has good rail voltage (+-27.5vDC) good regulated (+-21vDC). No DC on opamps outputs. Audio is present on opamp outputs. For some reason this amp is muted down as there is no signal going to output fets.

Is there a schematic for this one available?

Thank you

 

[Perry Babin]

See if the attached diagram is any help.

 

[Dr Zeus]

Perfect. Found D603 shorted page #1 top right. Also replaced the MPSA56 units at Q603 and Q605 for good measure. Amp is now passing gainful audio signal out to speaker terminals.

Thanks