The fuse located under the power cord plug is blown. I replaced it, and it immediately blew again. Inside, there are 3 switches which I wonder if they are in the correct positions. They are set to 2, 1, 2. Any ideas on what my problem could be?
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Re: Fuse at power cord blows
First check your speaker cabels for short circuit and speaker for short coil .after you confirm there is no shotr of cabel wires by checking with avometer in ohm postion.connect speaker if the problem excit your speaker is guilty - change it with same configuration.about switches put it in low order and chech for sound level and you can go up after that.
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This could be a faulty power cord, ie: two of the wires touching perhaps not visible to the eye. Or a short in the transformer or power supply. Check also internal fuse(s) if they have blown, suspect a faulty device in the power amp stage (on the heat sink) if they have gone too!
You can buy replacement 6.3 amp fuses at Radio Shack, but in a pinch you can substitute a 6.5 amp fuse. It's only slightly higher in value, so it will still blow soon enough if there's a problem.
However, this doesn't answer the question of why the original fuse blew. Fuses very seldom "just go bad", so before you start replacing a blown one you should find out what went wrong. Check the power supply rectifier diodes and filter capacitors for shorts. They sometimes break down with age or because of power line surges. Also look for shorted output IC's or transistors. If you can't do this yourself, see if any of your friends have experience servicing or let a professional fix it.
Please, don't just stick in larger fuses (or worse, wrap foil around them) when they blow. Many times I've seen what would have been a simple repair turned into scrap that way. Hope this has helped, and thanks for using Fixya!
It is possible that the fuse was blown due to a surge and replacing it will resolve the problem, but I wouldn't expect it. Usually when the main fuse blows, the primary stage of the power supply has a problem and the replacement fuse will blow as well. This is not a cheap amp and I would suggest that it be checked by a service tech. A few quick measurements internally can determine the likely fault and should not cost too much as an estimate fee.
get an electrical tester (screw driver with live indicator built in) and check which socket on your wall is live, connect the live/phase line to the fuse and the neutral to the other plug-in wire connector. conect earth or ground to any part of the power amp housing (should be conductive). do not connect earth to any part of the circuit board. urs is an amp that is not built to have earth connection on the board. be careful.
well fuse get burnt when there is heavy current flow than the fuse rating so there is heavy current flow and this current flow might be because off short circuit in the PCB and this short circuit might be because of any transistor breakdown so u have to check through the PCB.(Printed Circuit Board)
When the fuse blows suspect an overload in either the power supply or Main Amp section.
Check for burnt/damage parts first!
Power Supply faults that will blow the fuse are: Transformer, Rectifier, Voltage Regulator, Large Electrolytic Capictors, Diodes & any other semiconductor connected with it.
Main Power Amp faults are: any semiconductor device on the heatsink.
It's drawing too much current, make sure you install the excact replacement or an alternative approved replacement. Other than that, if it's still blowing the fuse than theres an overcurrent condition in the system...meaning a short.
Hi There DEKCAT
Its very unusual for both channels to blow......
I suspect that there is a blown power fuse inside the case......
There are fuses sometime located on the outside rear of the case and these can be easily checked to determine if they are blown..If you find one is blown please replace with the corrrect rated fuse,..... its current rating wil be on a small label on the case outside rear. like 1.0amp, or 1.5amp etc...
If you need to go inside the case please ensure the power plug is removed from the wall socket first.
You will find small glass fuses in the DC power supply feeds and probably one of these has blown, once again replace with the correct rated fuse.
Im not sure if your amplifier is a FET type or a large 32-40 pin IC type as if these are blown you will need a service person to do the replacement...
Please note there is a small relay that clicks 20seconds after turn on at the switch....if this click is not happening then there is problems with the timer circuit or the relay itself...
This relay controls the output to the speakers and as such stops all the sound output if its not working...so the first thing is to check all fuses, if they are OK then check the Relay operations....