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

Question 1

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Nsm tradition jukebox. I am getting intermitant loud popping from speakers. Usually starts after unit has warmed up. Can be an isolated loud pop or numerous loud pops.

You have a solid state chip or transistor that is failing.

Mar 09, 2018 • Audio Players & Recorders

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
http://electro-medical.blogspot.in/

on May 17, 2015 • Miscellaneous

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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

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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

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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

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2answers

I have a jl 10001 when i put power on it and hook up the speakers then when i plug in my rca jack its has a loud thumping noise comming out the speakers. can u tell me what mite be wrong.

Good be a ground issue from the headunit. Try running the amp off another source (another deck, an ipod etc) See if it goes away then.

Feb 06, 2011 • Jl Audio 1000/1 Car Audio Amplifier

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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

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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

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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...

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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

Question 2

Anonymous

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Posted on Jul 18, 2008

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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.

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

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Anonymous

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Related Questions:

Nsm tradition jukebox. I am getting intermitant loud popping from speakers. Usually starts after unit has warmed up. Can be an isolated loud pop or numerous loud pops.

REPAIR ASSISTANCE

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

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.

Amplifier in protection

I have a jl 10001 when i put power on it and hook up the speakers then when i plug in my rca jack its has a loud thumping noise comming out the speakers. can u tell me what mite be wrong.

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

Loud thump when turning of at switch

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

Keeps swirching to protect mode

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Nsm tradition jukebox. I am getting intermitant loud popping from speakers. Usually starts after unit has warmed up. Can be an isolated loud pop or numerous loud pops.

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Trustworthy Expert Solutions

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

1 Answer

Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

Nsm tradition jukebox. I am getting intermitant loud popping from speakers. Usually starts after unit has warmed up. Can be an isolated loud pop or numerous loud pops.

REPAIR ASSISTANCE

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

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.

Amplifier in protection

I have a jl 10001 when i put power on it and hook up the speakers then when i plug in my rca jack its has a loud thumping noise comming out the speakers. can u tell me what mite be wrong.

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

Loud thump when turning of at switch

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

Keeps swirching to protect mode

Not finding what you are looking for?

Audio Players & Recorders

Nsm tradition jukebox. I am getting intermitant loud popping from speakers. Usually starts after unit has warmed up. Can be an isolated loud pop or numerous loud pops.

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Grubhead

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Manuals & User Guides

DA-10252_manual_english_20110524.pdf....

Denon-DRW-585-Owners-Manual.pdf....

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