Question about Fender Passport Deluxe 500watt Sound System with Deluxe Speaker Array

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Fender passport model # 250 Used Only Twice!

Power-up the unit. Very low volume even with the gain turned-up. suddenly we hear a pop and crackel sound (like there is a loose connection). All connections examined and found to be fine. Try a mic in all channels, very low volume; like no power. Suddenly, red overheat light goes on and unit shuts down. It appears that only half the amp is working. if there are two amps, then one is defective somehow. this would account for the low power and the "crackle" from the speakers. The unit was used only two times as PA for small group of attendees at a seminar. Any suggestions? Thanks

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Go back in and find where the electrolitic capacitors connect to the board. They look kind of like a battery. One or both of them have broken loose from the main board, preventing any significant current from going to the output transformer, and causing overload. This is a common problem, and it does not take much rough handling to cause it.
where the break is is at the solder connection. Under a magnifying glass, the break will look like a little circle. Float fresh solder on that or any other large solder joints which may be cracked or broken.
Use standard precautions when working around high voltage.

Posted on Dec 02, 2008

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I have answered some of this before, however I have reveiwed the schematic and as an electrical engineer I want you to do a couple tests.

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