Question about Fender Music
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Posted on Jan 02, 2017
SOURCE: something has blown?
The output transistors may have shorted and caused a resistor to smoke (literally!!). This should not be too expensive a repair for anyone that works on these amps. Figure on $20-$30 for parts.
Posted on Feb 23, 2009
The protect circuit is activated by a current sensing transformer in the *input* of the power supply. If any of the subassemblies of the unit (or all of them in combination) draw excess current then the protect light will illuminate and the power supply shut down to prevent any damage to the system.
The circuitry in the power supply is fairly robust as well as fuse protected so it is unlikely that the power supply itself has failed. More than likely one of your output power transistors has been shorted and it is easy to check this yourself if you are interested in doing so.
Furthermore if you follow a few *simple* precautions you can do this safely and confidently.
Post again on this thread if you are interested and I will spew the details.
Posted on Mar 14, 2009
Not a fuse. First thing, to check your speaker (amp unplugged, of course), touch the + and - speaker connections to a 9V battery. If you don't hear a pop sound then your speaker is blown. Thus, no output sound. If speaker is OK, then the output IC is your problem.
Posted on Jul 25, 2009
Check that you don't have old batteries in the unit. Also that the auto power down is not activated.
If using a power adapter make sure it is the RIGHT one, both in polarity and current rating.
Posted on Sep 22, 2009
Testimonial: "Sorta helpful. How do I check for auto power down activation? Thanks for responding so soon. I'm not using batteries and used the original ac adapter."
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