NHT A1 schematic needed

[jeffjmr]

One of my two NHt A1 amps occasionally has no output until I cycle the power switch. It is set for auto power on, and the LED indicates it is powering up upon signal, but no output.

Any chance someone has a schematic or source for one?

Sounds like a simple relay issue but a schematic would be very helpful.

Thanks,
Jeff