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Amplifier cuts out...

The amp on my Yamaha KS 531 powered speaker (3-way 100watt RMS) is getting interference or turning off completely under load. I suspect the DH2TU relay or maybe the power supply. Where can I get a circuit diagram? Any other suggestions

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 15 Answers

SOURCE: Peavey 400SC

You can find Peavey's manuals in their archives at
http://www.peavey.com/support/searchmanuals/archived.cfm

They are grouped alphabeticaly across the top.

Go Fer' It,

FixThemAll.........

Posted on Dec 15, 2008

  • 1 Answer

SOURCE: On power up there is a loud humming even with volume at 0

I would also be inclined to check all the larger electrolytic capacitors in the power circuits as well for AC bleed.

Posted on Feb 24, 2009

danforddan1
  • 192 Answers

SOURCE: Peavy viper 75 watt modulating amplifier stops getting power.

Your are on the right track. This fuse may look good but still be bad. once you in there all ways replace with new, it helps extend the life. 95% sure it s the fuse. If not it will need to go on the bench. Good luck DFD

Posted on Apr 11, 2009

  • 5 Answers

SOURCE: Electrical interference on a DELL laptop.

It's definitely the laptop power supply. Switching currents are being forced into the ground connection.

What you need is an isolation transformer between the mixer and the computer.

Never, ever lift the ground pin. It's called a safety ground for a reason.

Posted on Aug 02, 2009

  • 5603 Answers

SOURCE: replacement speaker amplifier in my marshall mg100hdfx head

Yes. You can get them from Mouser electronics at $3.42 in singles.

http://mouser.com/Search/Refine.aspx?Keyword=TDA7293

Posted on Nov 11, 2009

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My QSC PLX 2502 amp completely blew. Channel 1 has been giving me problems for a year and I have had the amp about 3 years. This past week it drove into the red so much and I could not stop it. Well now...


You should NOT drive the amplifier into the clipping mode continuously. There is a possibility that you have fried your speakers or that they are the real problem. You haven't told us what you were driving, however this amp will deliver 450 Watts per side RMS at 8 ohms which means your speakers have to be rated at least that much RMS power for continuous. When speaker voice coils fry, they can wipe out amplifiers. Let us know what speakers you are using and how they are configured. This amp is going to be expensive to repair I can tell by looking at the schematic: Here is the schematic:

http://elektrotanya.com/qsc_plx2502.pdf/download.html

Scroll down to "get manual" and click to download it. IGNORE other download links.

This amp has circuits to boost the power supplies to the amps to handle the peaks. It is rather complex but the schematics are complete and have good explanations... some of the best I have seen. There are going to be a lot of destroyed components and great care has to be used after repair to "cold start" the unit to make sure nothing else is bad or it will blow up again. Most people do NOT have trouble with the QSC amps... so do tell me what speakers you are using and how they are configured so we can verify the design is correct. This amp is rated for 8 ohms so USUALLY only ONE speaker can be connected per side... and finding an 8 ohm speaker that can take 450 watts continuous RMS isn't easy. People fall for the advertising claiming "Peak" and "Program" power which are FAKE advertising... ONLY use continuous RMS power when sizing amps and speakers. There are MANY ways to cook out equipment... One is to boost the bass or the treble way up. Another is to NOT use balanced interconnect lines between mixers and your amps. Yet another is to NOT power ALL interconnected equipment from a single receptacle or power conditioning module. Please describe your setup further so I can help you more!

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I have two B215 600 watts speakers. Smoke started to come out of one when it was in use. I continued to use the other one, and about an hour later, the bass on that quit working. Any help with...


Sorry, those speakers are rated at 250 Watts RMS continuous, NOT 600. The speakers are nominally 8 ohms. The PMP6000 will deliver about 250 watts RMS to an 8 ohm load so the speakers should be able to take this as long as you had one per side and NOT using bridged mode of the PMP6000. It is possible that you fried the amp, although the PMP amps have a speaker protection network that shorts the output should the amp hard over. It is strange that you could draw smoke with the setup. Hopefully you were not generating very low frequencies that were below what the speaker could handle OR that you did not crank up the bass with the EQ such that frequencies below the speakers rating were sent at high levels. Your speakers are rated for a low end at 55 HZ. You should have the eq cut the gain below that. The leftmost EQ (50 Hz) should NOT be higher than center... if you boost that one, you likely will be buying new speakers. If you need power below that, then you need to be using subwoofers. Hopefully you haven't damaged the PMP6000... I assume that was the amp you were using, although you haven't stated that. At this point, unless the stuff is under warranty, you nee to open the speakers and see what has blown... could be the woofers or the crossover network...Use an ohmmeter to check the woofer DC resistance... should be between 7 and 9 ohms. If it is open circuit, the voice coil is blown.

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Almost any amplifier will work so there is no "best"... Just make sure the amp RMS rating is a bit below the RMS rating of the speaker for safety of the speaker. A QSC GX5 would be a candidate. You would use one side of it for each speaker if you have two, or use only one side for a single speaker. A lot of pro's seem to use these amps. USE BALANCED interconnections either XLR or TRS cables AND for sure power the amp and the mixer from the same receptacle... it often means running an extension cord like the pro's do to avoid ground bounce noise AND damage to the equipment.

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No low end from speaker. Sparks came out of backplate when switching the plug from jacks. Now the horns are only thing that works


If you failed to turn off the amp before changing speaker cables you have fried something. Since the plug shorts when unplugging, if the amplifier were on, the amp would sense the short and will often fry the amplifier or the speaker. You don't mention what the amplifier was. If the speaker were daisy chained to other equipment a ground loop probably formed and blew out the woofer. The horn often has Peavey's "SoundGard" circuit so it probably survived. NEVER change speaker cables while amp is on. ALWAYS secure the 1/4 inch type cables through the handle of cabinets so they can'tbe inadvertenly pulled out and burn up equipment. Your amplifier driving one of these should be rated at no more than 200 watts RMS. These "400 watt Prrogram" ratings are for the birds... fake advertising. Put 400 watts into this RMS and it blows out.

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