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EV 7300A Power amplifier is blowing fuses. Any recommendations?

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Can a technics su v670 be wired up with a technics power amp a800s mk II?? what im thinking it doubles up on the power the wattage to each channels? am i rite? the suv 670 is 90 watts per channel and the...


"im no proffetional at this". Really?

If you looked at the manuals for either product you would NEVER find a recommendation to use one amplifier's speaker input to drive the LINE LEVEL (very small) input on another amplifier. Speaker outputs are for driving speakers or amplifiers designed to accept speaker-level input (like some self-powered subwoofers). In no case is the power of the originating amplifer BOOSTING the power of the driven one.

You should do some reading on how amplifiers work before you blow something up and come asking for advice on how to resolve it.

Sep 02, 2011 | Audio Players & Recorders

1 Answer

Input fuse blows on switch on


In most power supplies, if the input fuse blows that fast it's because of some shorted component right at the AC input. Check for shorted rectifier diodes and filter capacitors. Both are common failures, especially if the equipment has been subjected to power line surges. If the power supply checks out OK, shorted output devices in the amplifier section is the next most likely cause. Check for low resistance on the outputs of the power supply. It's helpful to have a schematic diagram of the receiver for troubleshooting, and you can often service manuals or other information free or at reasonable prices on the Internet.

Jun 25, 2011 | Cambridge Audio Audio Players & Recorders

1 Answer

The internal 1.6 amp fuse in the power supply sometimes blows on or after switch-on.If the fuse does'nt blow the amplifier appears to work as normal on low volume.


check your wiring and the speakers for shorts...also, you need to look at the back of the amp..there should be an impedance rating for the speakers..it will be in ohms...if your speakers are lower than the rating on the amp then the fuse will blow as this causes the amplifier to overload..if the amp is rated for 8 ohms and you connect 4 ohm speakers this can cause this issue

May 28, 2011 | Audio Players & Recorders

1 Answer

Right speaker does not work on both A and B


Before doing anything else swap the speaker connections over to make sure that the problem is in the amp and not the speaker / speaker cable.
If that doesn't solve it then it is most likely an internal fuse blown on the amplifier circuit board - they are little tiny glass ones, obtainable from most tv repair shops, but it is important to get the right power rating. Also some of these fuses are 'quick blow' (go instantly there is a fault) others are 'slow' or 'time' blow - take a second or two before they actually blow - make sure you get the right one (timed usually have the letter T next to the power rating)

Mar 22, 2011 | Technics SA-DX930 Receiver

1 Answer

Set dead


Hi,you can use the following instructions below to troubleshoot the receiver set that is dead.

Instructions



Turn the receiver off and disconnect the power cable from the wall and the back of your receiver.

Test the cable with a multimeter to verify that it is working properly and supplying the receiver with full power. Multimeters are widely available through electronics supply shops, hardware stores and various online retailers. Different multimeters give different readings, so check your operations manual if you are unsure how to test a power cable for continuity. Replace the power cable with a working one of the same type if the original cable is not working properly.

Connect the multimeter to the pins where the power cable connects to the amplifier if the cable is working properly. This is the same area from which you disconnected the power cable in the first step. This is a particular process and all multimeters use different readings to test for pin-out continuity.

Check the fuses on the back of the amplifier if the multimeter shows a correct reading when you test the power cable and power connection on the back of your amplifier. Look carefully for a cracked filament within the glass tube; even a small crack can result in power failure or intermittent operation. A blown fuse will generally look gray or black around the edges or inside the glass tube. Blown fuses will not provide power to the amplifier and are a common cause of no power or a single dead channel, depending on the location and type of fuse.


Tips & Warnings

Opening the amplifier is not recommended, as there is a risk of electrical shock and you may void the manufacturer's warranty from Yamaha or any warranty provided by the retailer you purchased the amplifier from.

Always replace fuses with the same voltage fuse. Using the wrong type of fuse can damage your amplifier.

Do not try to open the receiver and fix the power supply if you believe that you have a power supply problem. This is generally quite dangerous if you do not know exactly what you are doing or are not working with the proper tools.

Hope it helped..

Feb 18, 2011 | Audio Players & Recorders

1 Answer

No power, doesn't turn on


Try opening up the unit and look for any fuses that may have blown.(they are probably little glass types). Make sure you replace with the same type and rating. If the new fuse blows immediately, then there is a problem in the receiver that will need to be checked by a trained individual. Some possibilities are:Power supply/Amplifier output stage/most any defective circuit can cause a blown fuse

Jan 08, 2011 | Audio Players & Recorders

2 Answers

I have a "peavey ultra 410" guitar amplifier. it has been sitting in the garage for several years, and there is no power when plugged in. The amplifier is all tube (preamp and amp). My question is this; if...


Even though I don't have a schematic, if you have a VOM, (Volt-Ohm, Milli-Ammeter) we can start. Just because tubes are old doesn't mean they are used up. If a tube doesn't light up that would be a bad one, but they are in parallel off a winding of the power transformer. 1.) Check the on/off switch with the ohmmeter and the line cord for conductivity. 2.) Check the primary winding of the transformer for a low ohms reading. (less than ten ohms). 3.) Some where between the power switch and the pwr. trans. should be a fuse. After these three you should be able to put 120vac. to the unit and bring it back on. Get back with us, Dale

Aug 04, 2009 | Audio Players & Recorders

2 Answers

Receiver fuse continuosly blows when replaced and powered up


Ir's not likely to be a resistor. Sounds like a shorted component in the power supply. A diode or bridge rectifier, or possibly a transistor or Regulator IC.

Hope that helps...

Geno

Apr 03, 2008 | NAD C720BEE Receiver

1 Answer

Blows fuse


i've got a problem on my denon receiver/amplifier. what devices are 1) KIA 7915PI 321,
2) SK B1560 44 P
3) SK D2390 43 Y
can you please send me some details about these devices (semiconductor, diode, integrated circuit, terminal voltage regulator, capacitor, etc.)
thanks in advance!

Dec 30, 2007 | JVC RX-5020VBK Receiver

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