Without a schematic I am fairly clueless.
PS voltages are 10, 18.75 and 57.75. Not sure if that's within specs. [A
different Pioneer SX model called for 65V.]
These PCboards are complete unmarked.
Digital vol control goes to "31". At "31" the digital output meter shows
maybe "1 watt" peak on a scale to 150. Very audible, but a fraction of what
it should be. I normally keep the vol @ "8".



"N_Cook" wrote in message
...
John Keiser wrote in message
news:48qdnVyu_aVeyq7TnZ2dnUVZ_qadnZ2d@powerusenet. com...
I've owned this receiver/amp for 30 years. Used infrequently but
functioned
fine. Today, while playing a CD, suddenly stopped after 5 minutes on low
setting. Toggled to mute, loudness, no joy. Using FM input, controls
seem
to work and I can hear music when I reach very high settings. Sometimes
crackles to very loud but only momentary. I think pre-amp is OK.
I'm thinking some sort of protective output circuit has activated but I
have
no schematic. Before I tear in blindly, does anyone have access to a
schematic for this [I found a source on rapidshare but file no longer
there].
Thank you.




If both channels affected then suggests protect cct. Test the voltages on
any zeners associated with that cct , drifting with age, and altering the
sense-window