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Have Pioneer M-770 amplifier. The main 6.3A 125V fuse keeps blowing whenever I switch it on. Original problem arose in the midst of playing music. Where should I focus on trying home repairs?

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  • Jacob Blackwood
    Jacob Blackwood May 11, 2010

    Is this an inline fuse between the battery and amp, the fuse you would plug into the amp, or your radio fuse in the vehicle fuse box?

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Hi: I have the same model Pioneer but the I keep blowing the 4 amp fuses. I discovered a short in the front amp module. I would suggest you start looking there.

Posted on May 07, 2010

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Inpect the wiring for breaks in the casing possibly a hot reaching ground also might be a faulty switch

Posted on Jun 21, 2009

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1 Answer

How do I fix my m-770 amplifier fromm blowing the 6.3A 125v fuse


There could be a short in one of the wires or within the amplifier itself! Check the speaker wiring first!

Dec 02, 2014 | Car Audio & Video

1 Answer

Can power on


Check the fuses.Blown fuse conditions
FU1 - 6,3A Doors/covers open is displayed.
FU2 - 6,3A Doors/covers open for the finisher is displayed.
FU3 - 4A paper end condition.
FU4 - 6,3A SC 121 is displayed.
FU5 - 6,3A one of SC302 or SC403 or SC405 is displayed.
FU101 - 15A no response.
Fu 102 - 8A no response.
FU103 - 1A normal operation,optional heaters do not work.
If FU or 102 is the problem,verify the main motor and the fusing unit heater lamps and thermofuses.After change the problematic fuse removal the fusing unit and turn ON the copier.

Apr 18, 2013 | Ricoh Aficio 450 Copier

2 Answers

Pioneer power amp m-770 keeps blowing the 6.3 amp fuse what could be wrong?


Suspect an overload in the power supply or audio output stage.
Power supply culprits include transformer, the big capacitors, diodes, bridge rectifier, voltage regulator etc.
Audio culprits are anything on the heat sink(s).
Look for burnt, damaged parts too, anything running very hot!
Follow the circuit from the fuse see where it takes you too start.

Nov 05, 2009 | Pioneer Audio Players & Recorders

1 Answer

Home Amp fuse keeps blowing


This usually happens when there is a problem with the main power supply and is relatively rare. If you can post the make and model, I can give you some things to check if you are somewhat familiar with electronics.

Thanks,
Dan

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Check the power supply look for anything that might be burnt or damaged.

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My sd-533hd5 keeps blowing the 5 amp 125v fuses


Yes! it sounds like a power supply problem! or the flyback in the main board needs replaced ( part is in the $70.00 range

Dec 12, 2008 | Pioneer SD-533HD5 53" Rear Projection HDTV

1 Answer

6.3a slow-blow 125v fuse


Hi, If the fuse physically fits into your unit then it will work. However- - - WARNING! Although 6.3 amps on a 250v fuse will allow the current to flow it will not afford you the circuit protection you require for a 125v circuit. If the circuit develops a fault then there is a danger that you burn out the circuit before the fuse. As you have already blown one fuse I would suggest tracking down the fault before you do any thing else.
The Scrivener.

Oct 12, 2017 | Pioneer VSX-D458 Receiver

1 Answer

Pioneer m-770 will not turn on


you probably have a short in the circuit some where. you need to replace the transistor and look at all the solder joints to make sure there not damaged or cracked. i have the same amplifier and i replaced the fuse several times and it blew every time up until the last time when the 4 of the power output transistors blew. what ever you do do not try and power it on till you do all the things i told you or you will have sparks and fire. my mistake cost me my amplifier. but might help you get yours repaired

Dec 24, 2007 | Audio Players & Recorders

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