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I have a QSC EX 2500. Recently, the unit blows a fuse immediatly when powered on. The fuse is located on a circuit board at the inside back left (near the speaker connections). This circuit board has two fuses but only one gets blown. Any help would be greatly appreciated. Sam

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It's not a problem it just show u thay ur speaker is unable to bear the load of it . just unplug the switch of the speaker before turn on ur computer and when ur computer turn on plug ur speaker again...

Posted on Dec 03, 2008

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I went to turn my Sony STR-K1000P on to listen to music but the little screen on the receiver/amp is blank, wont play music or anything have tried unplugging but still nothin, any ideas on how to fix


If you are somewhat handy you can remove the cover with usually two screws on each side + 3 - 5 across the back edges. You can see where the power comes in with the power cord and that will usually go to a transformer and there will be a circuit board either on the transformer or before the transformer that has fuses on it. You can check these fuses by holding them up to the light and see if they have a filament still going through them or you can use a continuity tester on a multimeter. Make sure you have the unit unplugged before you attempt any of this. If you find that the fuse is blown replace with the same value fuse. Failure to do so can cause damage to your unit especially if there is another electrical problem causing the fuse to blow. If everything is fine for the fuse the next thing I would look at would be called the isolation transformer which is usually located on a small circuit board near the power supply. to check it you would have to be familiar with Electronics and testing equipment. if you are not do not attempt this on your own.

Sep 12, 2015 | Sony Audio Players & Recorders

1 Answer

I have a RX 55 professional series, it will not power up, any idea's why it won't power up? ?


Most have an internal buss fuse, usually located on the back panel. Some are mounted on the main circuit board. Check to see if the fuse is blown, and replace it if its bad. Be aware that fuses are designed to prevent more serious damage to the unit, and that there may be other underlying reasons for it to blow, such as other component failures.

Jun 13, 2014 | Audio Players & Recorders

1 Answer

My is73 system will not power up . the 2 fast blow fuses are ok


Hello, welcome to Fixya!

Your receiver is having a power fault because it is not switching on. The receiver might have worked fine in the past, but that's electronics for you. Power surge, irregular power supply, excess power supply, etc can affect the unit thereby not making it to power on.

First, remove the unit's power cord from the wall, wait for about 30mins, then plug it back in. If it doesn't power on, plug it into another outlet, to make sure there electric current entering into the receiver.

If plugging into another power outlet doesn't power it on then it confirms that the receiver is having a power fault.

When electric current comes from the power outlet into the receiver, it goes straight into the power supply board which then circulates the current into the unit. So if the receiver doesn't power on, the first thing is to make sure there is power entering into the receiver.

So check the power cord, if it is a 3-pin plug, it must have a fuse in it. check the fuse if it is not blown. if fuse is intact, then power supply board should be checked.

This unit must have a power supply board in it where power enters from the mains. A capacitor, fuse, diode, etc may have been defective on the power board and maybe that's why its not making the unit turn on. There might also be some disconnection or something, inside the unit which is not making it to power on.

To actually find out what's wrong, you need to disassemble the unit with a screw driver and check what's wrong. You will be needing a meter and continuity tester in order to read the components on the power board. Once you detect any bad component, you can make necessary replacement at any electronics accessories store withing our vicinity. This is the only way by which you can detect and solve the problem.

Of course, testing the power board with a meter will require someone that has the ability. So it you can't, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.

I wish you the best of luck.

Regards.

Jan 05, 2012 | Audio Players & Recorders

1 Answer

Where are the fuses in the harman kardon 3380 receiver, I had a lightning strike which I think knocked out my receiver thru my outdoor speakers, it will not turn on, could it be a fuse and if yes, where is...


Hello Randy,
There are two options here: first, the power button is amber but unit still won't go. In this case try a 'factory reset' as per manual. If this won't work, it seems that the processor is gone (located on the display board) so you have to bring your unit into a authorized shop for repairs. Secondly, it might be just matter of some blown fuses which are located inside the unit on the transformer board. If after replacing (if they're blown) the unit still won't work or keeps blowing the new fuses, follow the first advice, meaning you have to bring the receiver to a service. To access the fuses, you have to remove the top cover.I wish you luck
Kostiko

Sep 12, 2011 | Harman Kardon HK 3380 Receiver

1 Answer

MY Altec lansing im620 just quit. I get no power at all. What could be the problem. George


Did you experience a storm recently...you may have received an electrical power surge...you can open the unit to see if the on board fuse is blown....just follow the power input cord to where it connects to the power supply...look for a small glass fuse...pop it out and see that the fine wire inside goes from one side to the other....the best way to check it though is to test it with an ohmmeter...if the fuse is good then there may be a problem in the power supply circuit that may need to be troubleshooted by a service tech

Apr 26, 2011 | Audio Players & Recorders

2 Answers

The unit has no power when pluged in it must have a blown fuse as i said before how do i replace it


Hi diamonddan11

I have posted to your original request for help the details of this. here is a sumary


  1. mains power fuse FU11 is located INSIDE the deck on the same circuit board and the mains on off switch.
  2. There is a thermal fuse that is not changeable inside the widnings of the transformer. This is can be repaired but generally it is considered that you replace the transformer
  3. on the printed circuit board attached to the secondary side of the transformer you will find 5-6 pico fuses, or circuit protectors. The are small black 2 pin devices that are marked on the board as IC901 to IC905
  4. the main power regulator board REGB ASSLY also has a circuit protector IC911.
  5. Thjere are several others in power supply areas marked as IC907, 908, 909, 910, 913, 914.
OK, thats a run down of the fuses in the unit. Non are considered to be user replaceable parts. If the deck has had the wrong mains voltage applied, it is likely that it has blown the primary fuse, FU11. If you do replace that fuse, and the unit still does not work, the transformer may be blown, or any one or combination of the Circuit protector type soldered in fuses may need to be replaced also. If you cannot follow what I have given you here, I suggest you take it to a Pioneer Authorised Service Center.

I am more than happy to answer any other questions you may have about it, just give me a hoy :) If you are still unsure, or have problems, then before you give a rating for this advice, please get back to me and we can try some more things.
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek

Jun 21, 2008 | Audio Players & Recorders

1 Answer

Fuse Replacement


Hi diamonddan11

I have given you direct instructions as to where the fuse is on your original post. The fuse is located inside the unit on the same printed circuit board as the mains power socket, right beside the main power switch.

regards
robotek

Jun 21, 2008 | Audio Players & Recorders

1 Answer

Fus burnt


The Fuse is internal and you must remove the top cover.  It is a 6.5 Amp, 5mm Euro size, mounted in a circuit board fuse-clip on the inside left rear corner of the chassis.  This is not a "user serviceable" part because if it blows you are usually in deep weeds concerning the power supply circuits.  If you a a "techy" this is not usually a huge problem.  If you find that the unit is "unrepairable" you can sell it on eBAY for parts.  There are lots of techies out there that will buy it.
Jim

Jun 17, 2008 | Sony STR-DE598 Receiver

1 Answer

Unit wont turn on


.Hi jepenny

The board you are looking at is the standby cct and power switching PCB. It sounds like that is working, so you have probably lost power to the transformer primary or the transformer is open circuit. Check for blown fuses and replace with exact same type and rating.

Be sure to unplug at the wall before touching any internals!!

If you can find no blown fuses, the power transformer may have failed. Good luck, get back to me here is you need any more advice. Thanks for using "FixYa"

regards
Graeme

Feb 17, 2008 | Harman Kardon AVR 25 MKII

1 Answer

Unit won't power up completely


The clicks you hear are the relay that completes the circuit for 110V AC to the main power transformer. Mine had the same problem and here's how I've gotten it to work. A lightning strike near our house caused it to fail, and I traced it to the power transformer relay activation circuit. The tuner and amp were fine. I found a bad transistor in the relay circuit, but didn't have a replacement on hand, so I soldered a jumper wire across the relay switch connections on the power transformer circuit board. This connects the 110V AC directly to the power transformer. DC Power to the amp and tuner circuits will still be controlled by the power switch, but the transformer will be supplying all the AC voltages to the main board. If there is a real problem with the circuits that load the transformer or the transformer itself, then the fuse will blow. If the fuse doesn't blow then I suspect the problem is just in the power sequencing circuit itself, that is not needed for operation other than to make the unit "Energy Star Compliant". A lot of electronic items have a transformer that is not switched, and only fused, so that the supplies are available at all times.

Jan 24, 2008 | Audio Players & Recorders

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