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Fender Princeton 65 DSP
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Yvan
Dec 9, 2009, 4:32:27 PM12/9/09
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Hi!
I've put a video of a problem I am having with a Fender amp in the
college where I teach.
I'd like to know if someone here has ever seen (heard) this and id you
did, what did you do to solve it permanently.
http://www.youtube.com/user/MonsieurFort#p/a/u/0/R-gtGg6IhHw
Thanks!
Yvan
It looks funny but it's real.
oasysco
Dec 9, 2009, 8:11:19 PM12/9/09
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Could be a bad input jack, bad soldering points on the PCB, something
tied to the DSP circuit, ???. In any case, with these amps, taking
them apart means taking them all the way apart and you may be better
served by replacing it.
oasysco
Dec 9, 2009, 8:16:24 PM12/9/09
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Check out this vid of the same problem or very close:
Yvan
Dec 10, 2009, 5:12:27 PM12/10/09
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Thanks
Yvan
Phil T
Dec 11, 2009, 6:43:07 AM12/11/09
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In the world of antique radio repair that sound would be referred to as
'motor boating'. Generally caused by a faulty electrolytic capacitor,
or a faulty connection of an electrolytic capacitor in it's circuit
which is what Greg's video is actually showing. When Greg taps or
pushes on the electrolytic filter capacitors the sound stops. When you
pound on the top of the amp, the sound stops. Re-flowing the solder
connections on the board would probably fix that. But it could be the
capacitor itself. It could also be one of the smaller bypass
electrolytic caps elsewhere in the amp but I'd start with the large ones
which are power supply filter caps.
'motor boating'. Generally caused by a faulty electrolytic capacitor,
or a faulty connection of an electrolytic capacitor in it's circuit
which is what Greg's video is actually showing. When Greg taps or
pushes on the electrolytic filter capacitors the sound stops. When you
pound on the top of the amp, the sound stops. Re-flowing the solder
connections on the board would probably fix that. But it could be the
capacitor itself. It could also be one of the smaller bypass
electrolytic caps elsewhere in the amp but I'd start with the large ones
which are power supply filter caps.
Phil T
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