Adcom GFA-545 Distortion LED Lit -w/schematic

[PreCD]

I have a GFA-545 that has a left channel distortion LED lit. Channel sounds fine and the amp has been operating great. Still is. What could be the problem? Schematic attached with the LED in yellow.

 

[geraldfryjr]

check to see if Q607 has become leaky or shorted also check R407 for the proper value.

jer

 

[PreCD]

Will do.

 

[Mooly]

Measure and compare the volt drop across R607 with the good channel. Also measure the voltage across R613 and compare with good channel. Should be around 0.68v ish.