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I own a Peavey amp #kba 100. Speaker may be blown or loose. How does the case disassemble so I can get to the speaker to determine the problem? Thanks for your help!

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There should be Screws on the back of the unit witch takes off the whole back panel to were you see the back of the speaker an the wiring in side the amp, on the speaker mounts should be somebolts or clips to were the speaker will slid out from the back

Posted on Oct 20, 2008

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Carver manual


Could be....
  1. There's a short in your speaker wiring somewhere
  2. or a blown speaker
Wiring shorts might be only a single strand of copper wire. But it's enough that at higher volumes it conducts enough current between the speaker terminals to trip the amp's protection mode.

Fix the problem. Go through your wiring. Check using a torch. If all looks good then it's a blown speaker.

Remove the speaker wires from the amp. Switch the amp on and turn the volume up full. The amp should stay on. Turn the volume down and switch off.

Now connect ONE speaker only. Try the amp on and volume up again. If it trips out then that's the faulty speaker. Repeat by adding one more speaker each time. When the amp trips, the last speaker added is the culpret.

If you've done all the simple stuff, then what's left is a problem with one of the output transistors. It needs the output transistor(s) replaced inside the unit. These directly drive the loudspeaker outputs on the receiver itself, and one or more of them being shorted (closed circuit), will trigger the error on the display of the receiver, and it will not go off until the problem is repaired. They are not user-replaceable as they are PCB mounted, and thermally coupled to a heatsink. In this case, the unit is in need of service.

Sep 07, 2014 | Audio & Video Receivers

1 Answer

Nad t753 av reciever, mains power off then back on think had power surge have i blown a fuse in system. amp turns on but then 2 sec later turns off . can i take the casing off to replace fuses?.... dan


Blown fuses don't self-heal. If power comes back there is no blown fuse.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

May 29, 2011 | NAD T753 Receiver

1 Answer

My onkyo reciever (tx-ds656) powers on, then after a couple seconds says "protect" and powers down. why is this happening? rmill24@yahoo.com


"protect" comes on for 4 reasons.

1. crossed or damaged speaker wires- make sure that the positive and negative is not crossed at all. inspect the wiring for any loose strands of wire that might be crossed, touching the speaker frame or touching the metal case of the amp. look for any damage to the wires. use new speaker wires, if you need to.

2. improper speaker ohmage- verify that your speakers are 8 ohms or greater. ohmage is usually labeled on the back of the speaker, and will have the greek letter "Omega" ω next to the ohmage rating. example: 8ω or 16ω.

3. blown speaker- push in on the woofers, it should move freely for an inch or 2 before bottoming out. if it feels like its scratchy or rubbing or there is any resistance before it bottoms out, then the speaker's voice coil is melted.

4. blown amp.

Nov 07, 2010 | Onkyo TX-DS656 Receiver

1 Answer

Caused speakers to smoke:(


If it's the speaker cabinet itself that';s smoking, you have most likely burnt some components in the passive crossover. Pull it out and you may see melted parts or scorching on the circuit board. Peavy does repairs on it's own products pretty reasonably if there's no local tech. Call Peavey Customer Srervice at 877-732-8391.

Apr 30, 2009 | Audio & Video Receivers

2 Answers

Hi there, My 50 watt MG series marshall amp keeps making a loud rattling sound when its turned up loud. Any ideas why this is and how i could fix it? Ashley Fields e-mail: ashley_ibanez@yahoo.co.uk


bring spray contact cleaner from radio shack near you and clean volume control for amp while you are moving it forward and backward---do not put your mic in front of your speakers because this will give you more trouble.

Sep 12, 2008 | Audio & Video Receivers

1 Answer

Peavey Mark III Bass Combo Amp My low-end started coming in and out and then just left for good. Did I blow the speaker or just short something? If I want to fix this thing, how do I do it? I don't even...


To get the speaker out, pull the frame with the grill cloth out of the amp by prying it out from any side, top or bottom. The grill frame is only held in with plastic velcro-like stuff. Once it's out, the speaker is bolted into the cabinet from the outside. Just unscrew the bolts holding it in, and lift the speaker out.

For removing the amp chassis, unscrew the bolts on the chrome plated strips on the top of the amp at the end of the right and left sides. The chassis should slide out the back. You may need to pull the speaker wires off the speaker, or pull the connector that hooks up the the chassis from the underside, which means you need to take out the speaker first.

Contact Peavey for the diodes and any other electronic components you need.

Aug 22, 2008 | Audio & Video Receivers

1 Answer

I was playing guitar through my fender 85 amp and the volume suddenly cut out to almost nothing and I couldn't make it loud again?


The speaker could be blown. Try touching a 9volt battery to the terminals on the speaker. If the speaker makes a popping sound its not blown. The other culprit could be the input jack of the amp. If its soldered directly to the board. The retaining nut may have come loose and the jack wiggle around with the cord tension. resulting in a solder connection breaking at the board. But that usualy will give a ground hum or no sound at all. So im leaning towards a blown speaker. (providing its a solid state amp) If it's a tube amp. it could be that one or more of the power tubes are bad or have a vacuum leak and may need to be replaced. ( you have to replace all the power tubes at the same time and have the amp biased.

Aug 19, 2008 | Audio & Video Receivers

1 Answer

Blown crossover in a Peavey Pro-Sub 15" speaker cab. Can this be repaired? If not, where can I get a new crossover? I went to Peavey's web site and this particular crossover isn't on there.


Yes it can be repaired. Your best bet is to locate an authorized Peavey service center and order the crossover from there. Most will sell the replacement crossover directly. The cost of the individual parts will not be significantly less than the entire module. Are you sure that it is the crossover that is smoked? It is unusual for the crossovers to go bad. What is the symtom of the speaker failure?

Dan

Aug 18, 2008 | Audio & Video Receivers

1 Answer

I have peavey 212 heritage guitar amp footswitch plug broke. I have new one but i need wire diagram please include colors and speaker conection.Thank U very much


Call the Peavey Customer Service line (number available @ the Peavey site) and get the parts department to email you a schematics on the amp... it has the footswitch wiring on it. And it's free to do this.

Apr 27, 2008 | Audio & Video Receivers

3 Answers

Two amp


I don't know why you'd set the Peavey to 2 ohm to drive 8 ohm speakers??? My other thought is... I wonder if the phase is correct. try reversing one of the speaker wires Left or right side.

Geno

Feb 27, 2008 | Harman Kardon AVR 630 Receiver

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