Attempting audio amp (Pioneer A-9) repair - any tips?
Jumpster Jiver wrote:
jakdedert wrote:
andrew queisser wrote:
My trusty Pioneer A-9 has a problem on the right channel. If I listen
on the headphones the sound is great, on speaker the sound is fuzzy
but only on the right channel. The headphone ouput actually comes
from the speaker output, not the preamp, so it seems that
fundamentally the signal is getting through but under load it gets
fuzzy. I can hear the distortion in the headphones when I click the
speakers on but when I click the speakers off the sound is fine.
The power supplies feed both channels in parallel so I doubt it's a
power supply problem.
I have a scope and a little audio probe gizmo that lets me listen to
audio signals with an earphone. I can generate signals from my PC and
feed them into the amp, if that helps. I also have the schematics so
I can trace the signal but I'm not quite sure how to go about it.
Any tips?
One tip might be to reverse your speaker connections left to right and
see if the problem remains in the same channel.
It might not be a problem with your amp....
jak
Thanks,
Andrew Queisser
Maybe it's a problem with the speaker?
Have you tried switching the speakers?
Carefully checked the speaker wires?
Maybe the right speaker is bad.
Maybe there is a frayed wire. maybe even a short at one of the ends.
A frayed end just barely touching the other wire could be causing the
problem, and if it is allowed to continue like that you'll blow the
channel.
My thoughts exactly....
jak
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