"John Keiser" wrote in message
news:j5mdndbY58Q3Fq7TnZ2dnUVZ_i2dnZ2d@powerusenet. com...
Unit has a jumper connecting preamp to amp. Signal injected to power amp
is perfect. Not the power stage after all.

Preamp seems to respond, balance, volumne, mute circuit wise but output
must be severely reduced.

Any suggestions?






"John Keiser" wrote in message
...
Digging a little deeper, I can see a relay on the power amp board. I
assume this is part of the output protection circuit. If this were the
issue, would I have any sound at all? Sound is present, just extremely
low. I haven't yet checked voltages. [Not a switching mode PS - large,
very heavy transformer circuit.]




"John Keiser" wrote in message
...
Not shorted.
I thought of that and attached different speakers and same result.
Sound comes out of both speakers, balance controls function, mute button
drops volumne as it should.
Output meter and audible output simply dropped to marginal. [Vol on max
should be overpoweringly loud, it is now a whisper.]
Both channels equally effected.
There are perhaps 6 fuses. I removed and reset just in case they were
oxidized. No joy.
Other suggestions welcomed.


"Smitty Two" wrote in message
news In article ,
"John Keiser" wrote:

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.

Speaker wires shorted?







Make sure the tape monitor button is not engaged. TURN THE VOLUME DOWN prior
to pressing this button. Also, it wouldn't hurt to try pressing and
manipulating the various controls to see if any of them might be cutting
out.

Mark Z.