Question about Parasound 5250 5-Channel Amplifier

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I have a parasound 5250 5 channel amp. Channel one is not working. Is there a fuse?

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Hi, there is no fuse on amplifier output only power supply, the problem is some parts of electronic that drives into audio output of the amplifier maybe are shorted like transistors, diode or amplifier Ic's. bring it to a nearest service center to check it. or if you have a knowledge in technical yo can used multi tester to check it. Note: unplugged it first before you open the cover to check it. thanks

Posted on Apr 28, 2011

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Posted on Jan 02, 2017

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My parasound 2205a 5 channel smells like cat urine it lights up front window says normal but no sound from speakers what blew when cat urine in top


******? E****d? Maybe unplug, take cover off; and check for p**s tracks. Then go brush the cats hair the wrong direction.

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Fuses only blow if there is an overload somewhere. The most likely cause being a transitor that has shorted out. Easy to spot with a multi-meter on the ohms setting. As it will be liked you have touched the test leads together!

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Check internal AC fuse. If intact, amplifier may be in protect mode due to fault.

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1 Answer

Parasound A51 have two channels out. The blue indicators in from of the amp did not turn on. The other three have blue lights when power is engaged. I opened the cover and measure each independent channel...


Whatever does the work in those channels has gone open circuit. This would not cause a fuse to blow, so power would be still present. I suspect it is the main amp chip(s) or transistor(s), which will be found on a heat sink.

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1 Answer

I have an overload indicator on channel 2. I opened the lid and swapped the channel 2 module with the channel 5 module and the overload light followed the card and showed up on channel 5. Parasound said...


I believe that the output transistors may be bad. Without seeing the actual card, there is no way to tell. If the parts are under warranty, request a replacement board. If I remember correctly, the board is the field replaceable unit (smallest orderable part) anyway. If not, you will need instruction from Parasound about what to do next.

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I would check out whatever drives the left channel first. If it is a transistor, you can put a ohm meter on the terminals and see if it shows a short (amp turned off). If there are two transistors for the left channel, and you find a short on one only, replace the other to be on the safe side.

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1 Answer

The amp is only putting out on 1 channel


I do believe this is caused by one of your amp fuses. Depending on which + on the amp is being used. That channel has a blown fuse. have you tried running + and -, + and - to both channels to see if both subs worked? If one sub doesn't then it's a blown fuse or scarred fuse and needs to be changed.

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Normally, power transformers don't hum loudly unless there is a problem in power supply circuit. If all seems normally operational, the problem may be simply anchor screws that hold transformer to frame may be loose. Try tightening them

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