Question about Technics SUV500 2-Channel Amplifier

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My amplifier puts about 36volt dc at the speaker outputs. what kan be wrong. I just kant vind the fault.

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  • Ron Price May 11, 2010

    What brand of amp?

    rjprice


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This is not a good thing. The DC current will cause the speaker ciols to heat up just like the element in a toaster. This unit requires repair. Either the outputs are shorted or the driver circuit has a problem.

DO NOT hook this up to speakers as the speakers will be damaged.

Dan

Posted on Mar 06, 2009

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6ya6ya
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Posted on Jan 02, 2017

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My Yamaha YHT-791BL amplifier goes off every time I turn it on. How can I fix it?


hello,
Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Its usually not a fault that you will see unless somethings burnt up. This is solid state electronics and you dont see this stuff go bad. But in the meantime try disconnecting the speakers and see if it still goes into shutdown and at the same time have a dc multimeter attached to the speaker outputs. If the unit comes on and you dont see any DC at all or very very little B+ on both speaker terminal sets then you may have a defective speaker. If you do see dc then thats why the protections comming on so you dont blow out your speakers.
Also check for cracked solder connection.
Good Luck

May 26, 2010 | Yamaha AX-596 Amplifier

1 Answer

DC Offsets on output - protection don't allowd to switch on


you don't want to do this( bypass the protection0
that d.c. output will burn the coils in your speakers with out making a sound!! you have a biasing problem
or like you said a d.c. offset problem it is best to work on this problem with out a load on the amp, this will allow you to trace back where the trouble is starting at. caps will cause this sort of problem but leaky transistors can also do this, even diodes.
this will require an experienced trouble-shooter.

Apr 26, 2010 | Audio Players & Recorders

1 Answer

My protection light will keep turning on and off on my kicker zx250.2


THE GOAL HEAR IS TO DETERMINE IF THE INSTALLATION IS CAUSING YOUR PROTECTION FAULT OR IS IT THE AMPLIFIER ITSELF HAVING INTERNAL DAMAGE. REMOVE THE RCA INPUTS AND DISCONNECT THE SPEAKERS, THEN POWER THE AMPLIFIER UP WITH THIS NO INPUT, NO SPEAKER LOAD CONDITION. IF IT STILL GOES INTO PROTECTION, THEN THE AMPLIFIER WILL NEED TO BE SERVICED, AS YOU HAVE TOTALLY SIMULATED A BENCHED CONDITION THAT IS TOTALLY INDEPENDENT OF YOUR INSTALLATION. MOST TIMES, THE AMPLIFIER WILL GO INTO PROTECTION WHEN IT SEES AN EXCESSIVE LOAD WHEN TURNING UP THE VOLUME, WHICH IS USUALLY CAUSED BY TOO MANY SPEAKERS OR DAMAGED SPEAKERS, BUT IF NO SPEAKERS CONNECTED, THEN IT IS USUALLY BECAUSE THE AMPLIFIER SEES AN EXCESSIVE LOAD OR DC OUTPUT DUE TO ITS OUTPUT SECTION BEING DAMAGED. IN ANY CASE, ONCE REPAIRED, YOU MUST CHECK YOUR SPEAKERS FOR BURNED VOICE-COILS, WHICH WILL IMPOSE AN EXCESSIVE LOAD TO THE AMPLIFIER AND CAN CAUSE IT TO FAIL AGAIN. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

Jan 14, 2010 | Kicker ZX250.2 Car Amp

1 Answer

I have mtx tc6001 amplifier and they have 55v DC current at the output , so blow speakers. what i can do?


THIS IS CAUSED BY SHORTED OUTPUT TRANSISTORS AND/OR DRIVER TRANSISTORS WITHIN THE AMPLIFIER AND THE PROTECTION CIRCUITS ARE NOT SET UP TO DETECT THIS CONDITION. BECAUSE THIS AMPLIFIER CAN ACTUALLY RECEIVE AN INPUT THAT HAS DC OFFSET WITHIN IT AND ACTUALLY PASS IT THROUGH EACH STAGE, YOU MUST DISCONNECT THE RCA INPUTS AND MEASURE THE DC VOLTAGE AGAIN. IF IT DISAPPEARS, THEN YOU HAVE A PROBLEM WITH THE STAGE BEFORE THE AMPLIFIER WHICH IS EITHER THE RADIO OR OTHER DEVICE SUCH AS ANOTHER CROSSOVER, EQ, ETC. IF THE VOLTAGE IS STILL PRESENT, THEN THE AMPLIFIER IS DAMAGED AND IT WILL HAVE TO BE REPAIRED. YOU WILL PROBABLY FIND THAT IT IS IN FACT THE AMPLIFIER. ALSO, THE REASON THIS BLOWS THE SPEAKERS IS THAT THE DC OUTPUT FROM THE SPEAKER OUTPUT TERMINALS IS WORST THAN ANY DISTORTION OR OVER-DRIVING POSSIBLE, AS IT IS THE ENTIRE POWER SUPPLY OF THE AMPLIFIER GOING STRAIGHT TO THE VOICE-COILS WITH 100% DUTY CYCLE, THEREBY HEATING THE VOICE-COILS UP VERY QUICKLY AND WILL LOCK THE WOOFER UP. YOU PROBABLY WILL SMELL THIS CONDITION AS THE VOICE-COILS BURN. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE. I AM LISTED IN THE REPAIR SECTION OF THIS SITE UNDER THE ZIP-CODE 70360.......V

Jan 12, 2010 | MTX Thunder® TC6001 Car Amp

1 Answer

Speaker Pulses in and out little bit no sound switch wires around other speakerdoes it


IF THE SPEAKER PULSES IN OR OUT WHEN YOU CONNECT THE LEADS TO AMPLIFIER, IT MAY BE OUTPUTTING DC WHICH WILL EVENTUALLY BURN THE VOICECOIL OUT. MOST TIMES AMPLIFIERS ARE DESIGNED WITH PROTECTION CIRCUITRY TO DETECT THIS CONDITION. A FEW RARE AMPLIFIERS WILL ACTUALLY PASS A DC SIGNAL FROM THE INPUTS, THROUGH THE AMPLIFIER, TO THE OUTPUTS AND ONWARD TO THE SPEAKERS, SO I SUGGEST THAT YOU REMOVE THE INPUT RCA'S AND RETEST. IF IT STILL DOES IT, THEN THE AMPLIFIER WILL NEED TO BE SERVICED.....V

Dec 26, 2009 | Pioneer GM-5200T Car Audio Amplifier

1 Answer

I have blown the protection circuit on my yamaha rx 600d amp anyone with a clue whats needed to fix?


Hi friend,when something goes wrong in the output of the amplifier the protection circuit take place to prevent further damage could cause by DC power such as speakers or other related circuits...I think in your situation either one or both output amp stage have blown,then the protection cct turned on (not blown protection circuit!?). If so you have to check all the output transistors for short cct, if shorted you must also check all the DC bias cct nearby such as small transistors,resistors...If you are not familar with amplifier it better to find a tech as all amplifiers need a very precide repair technic , If the DC BIAS were wrong , when you turn on the power it will blow straight away! All times and cost will be waisted!
GOOD LUCK!
Tan Ta

Nov 23, 2009 | Yamaha Audio Players & Recorders

2 Answers

How many watts is it


http://www.kenwoodusa.com/UserFiles/File/Global/Consumer/Manuals/kac528.pdf

Page 7 of the manual gives you all the different configurations of this amp, and it's MAX power. FYI; Kenwood rates their amps at MAX power, not clean. Hope this helps.

Sep 30, 2009 | Kenwood KAC-628 Car Audio Amplifier

1 Answer

No sound tv


it can be many reasons
1 some tvs have on the back a internal/external speakers many times the customer unadvertidly move the sw to the expternal position
2 the speakers are deactivated from the man many
3 check if the tv has a his noise coming out from the speakers at full volume if so then the amplifier are good & the same for the power supply if no hissing noise then check dc votege is geting the amplifier if so then the amplifiere is most likly the fail if not then the power supply is at fault
3 check for the output capacitor that most of the amplifiere have in the output is conected directly to the speaker
4 if no capacitor is found then it must be +B & -B in order for the amplifier to work the lack of one of them mus make the amplifier unoperable then define why is not ther & fix the cause

Feb 03, 2009 | Televison & Video

2 Answers

Amp works but DC comes out of one speaker output


To get the clamps off click HERE.

There may be several bad components. Normally, shorted outputs (the most likely cause of DC on the outputs) causes the amp to go into protect mode. In your amp, you may have shorted output transistors, open emitter resistors and possibly a problem with the protection circuit.

To get up to speed on the basics, read through the following page:

Amplifier Repair Primer

After you read through that page, remove the clamps and check all of the output transistors to determine if any are shorted.

Let me know what you find.

Oct 04, 2008 | Power Acoustik GOTHIC OV2-520 Car Audio...

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