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Solid state transistor amplifier. The speaker 'thumps' loud when switch on.

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Check proper connection to output stage(good condition of speakers cables)no short in cables or touching each other.-no problem in speaker itself(speaker coil short circuit or open circuit)-disconnect all from amp and check if it is ok-you will have a problem in cables or speaker if not you will have a problem in your amp.

Posted on Jul 18, 2008

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Mackie thump 15 a over load light stays on when powerd not even sending a signal to them.


There's a problem with the amplifier transistors or other heat generating circuit. That's what triggers the overload light.

Sep 11, 2014 | Mackie Thump 15 TH-15A Powered Speaker

Tip

REPAIR ASSISTANCE


ROTEL RA 980BX
Fault: No output from left channel. The right channel is working fine.

Added some photos and circuit for reference

While testing the amp noticed that the left channel is giving switch on off thump while powering ON and OFF the amplifier. It happens when there is DC voltage flow through the speakers. It shouldn't be there. And the thump is there only on the left channel. While testing the amplifier section found that all the transistors where idling at mentioned voltage. All Base pins where around +/- 0.5volt. and the output is almost 0.012mvdc.
FOR MORE DETAILS CHECK THE LINKS
http://electro-medical.blogspot.in/search/label/ELECTRO%20MED%20SERVICES
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on May 17, 2015 | Miscellaneous

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We have a Optimus STAV-3770 that is stuck on 'Muting'. Have tried everything we can think of to no avail. Even purchased a new remote.Is there a solution.


Switch off the mains supply before connecting/disconnecting any cables.

Disconnect all the speaker cables and switch on. If the fault clears carefully check the speaker wiring for shorts before reconnecting.

If the fault is not in the speaker wiring or speakers the amplifier will need expert attention. Faulty speaker wiring can easily damage solid state amplifiers.

Aug 03, 2014 | Optimus Audio Players & Recorders

1 Answer

Amplifier in protection


That thump beat was called motor boating and is amplfier oscillation. It means that a driving transistor in the audio output circuit is bad. You will have to send this in.

Apr 21, 2014 | Car Audio & Video

2 Answers

When I power up my guitar amplifier if produces a loud hum through the speakers and then makes a loud intermittent popping noise, why?


your capacitors may be blown , if its a solid state amplifier ..

if its tube version (best) , you may have blown a tube

what model number is it , manufacturer ?

Oct 15, 2010 | Audio Players & Recorders

1 Answer

Loud thump when turning of at switch


This is COMMON for consumer electronics. The amplifier goes out of balance during power loss. Fancy high power units have a relay which instanly disconnects the speaker when power is removed.

Apr 20, 2010 | Audio Players & Recorders

1 Answer

Marshall MG50 DFX makes a squealing noise on power up


Yep, chalk that one up to poor design...The amplifiers are going out of balance during power up and down. Two seconds is pretty long... Try turning down the gain during power on and see if that affects it.

The pop on turning off is normal... None of these have speaker disconnecting hardware that is necessary for very high power amps. The biggies have hardware that checks amplifier is balanced before connecting the speakers and a relay also cuts the speakers immediatley on power down. As power goes up and down the circuitry comes to equilibrium and until it does, strange things happen.

I would investigate the CONDITION of the filter caps for the main power because if they age to a higher internal resistance that COULD cause the high freq oscillation on power up... Two seconds is MUCH too long.

There should also be some non-electrolytic caps NEAR the power output transistors to handle high frequency supply power bypassing.

Check the power bypasses that service the preamp stages. Look for pregnant electrolytic caps that have failed.

Ultimately, you MAY need an oscilloscope to isolate the high freq problem.

Jan 03, 2010 | Marshall Music

1 Answer

Amp Power light will not go on. Protection light is lit- Thump sound in speakers


It probably has shorted output transistors. To eliminate other possible causes, read through the following page.

Amplifier in Protect Mode - Troubleshooting

Let me know if you have any other questions.

Oct 31, 2008 | Visonik Dual Bass Box with Amplifier Car...

1 Answer

Keeps swirching to protect mode


First thing to do is disconnect all of the speaker wires on the amp. Turn on the amp, if it is still turning on and off then there is a definant problem in the amp circuitry. If you have no solid state service skills, I highly advise you to take the amp into a repair shop. If it stops turning on and off turn off the amp and try and connect up one speaker at a time untill the amp starts to mess up. you then take that speaker and have it checked out and inspect the wireing for pinchs or shorts.

Oct 03, 2006 | JBL GTO 301.1 Car Audio Amplifier

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