Question about Sony XM-754HX Car Audio Amplifier

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Offset problem DC voltage present on the speaker terminals??? what do i do?

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What make/model amp is it?

Posted on Oct 01, 2008

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Blaupunkt tv 8022s


can you power up the radio? one way to check whether the power amplifier still alive or not, get a multi meter to measure the speaker terminal. should not get any dc voltage between the 2 terminal for each speaker. if found any dc voltage meaning the power amp is dead.

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Integra 5.3 keeps turning off so TV will not go on. It flips back to standby mode after 2 seconds and screen says check signal cable or check connections. This issue started yesterday with a loud noise...


you most likely have a blown main output transistor or a shorted speaker. first get a mutimeter and set to lowest ohms setting and check for 4-8 ohms ( CHECK IMPEDENCE rating on back of speaker) at the speaker terminal of the speaker. if this checks out then you take the meter and set to DC and place the + / - terminals to the speaker connection on back of receiver then turn on the receiver . notice if you have any dc voltage at any sp terminal, if dc is present you have a blown output transistor. If you are not an electronic tech please refer your unit to a qualified service tech. I hope this helps.

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My kenwood ddx616 indash keep showin DC OFFSET ERROER?


You could have a speaker wire or speaker tensile (flex) lead that is shorting to ground, on a floating ground BTL head unit (all that claim 18-25 watts RMS per channel) all 8 speaker wires are always floating at about half of the supply voltage, IE if the voltage is 14.4 with the engine running the speaker wires will all measure about 7 volts to ground.

The flex leads are the wires on a speaker that go from the terminals to the cone.

Jan 30, 2012 | Car Audio & Video

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

Htr 5630 shut off in 2 sec.


Sounds like you have a bad amp IC or transistors.
When these go bad they almost always put roughly 40 volts dc from the amp power supply to the speaker terminals. The protection circuit senses this dangerous (to your speakers) dc voltage and disconnects the speaker terminals from the amp via internal relays (the ones you hear click) and puts it into protect mode. If it didn't the dc voltage would quickly toast the voice coils of the connected speaker.

Apr 18, 2010 | Yamaha HTR-6130 Receiver

1 Answer

Power seems to cut in and out - it 'clicks'and a second red light comes on - most of the time just one red light is on. Thanks


The click you hear is most likely the speaker protection circuit relay due to the protection circuits being triggered. In the event of a dc voltage appearing across the speakers the protection circuit isolates the the speaker terminals from the output stage.
Dry joints on the relay is not uncommon and causes false triggering. Check both pos' and neg' supplies are present at the output transistors / ic. Connect a dc volt meter across the speaker output terminals if a voltage of more than a few millivolts appears just before relay clicks then check the ouput stage for dry joints, leaky transistors and resistors having increased in value.

Mar 05, 2010 | Audio Players & Recorders

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

Sony car stereo


When the amplifier shows an offset fault, it's generally because there is DC voltage present on the speaker terminals. The amp has shut down to protect the speakers.

Aug 14, 2008 | Sony XM-754HX Car Audio Amplifier

1 Answer

Possibly bad audio amp ic


You'll need a voltmeter. Check for the absence of DC voltage at the amp ic's outpit pins under no signal conditions. Note, you need to check the output pins of the ic, not at the speaker terminals, as a relay would lift the speakers off circuit in the event of a DC potential being present at outputs, to protect speakers.
Jango

Mar 16, 2008 | JVC HX-D7 Shelf System

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AVR-1603 - no Sound exept over Headphones is a weak signal


First check the outputs at the output fets/transistors for any DC voltage. Reference your voltmeter to the speaker - terminal. If there is ANY DC offset, the amp is shutting down the outputs to protect your speakers from DC. Is the power supply + and - 47 volts? If only one supply is there That is your problem because the supplies should be symmetrical. Also look for any wiring problems from the amp to your speakers... any shorts? Try disconnecting all your speakers to totally eliminate any speaker problem and see if the relays still click. You should hear only ONE click when you first turn the amp on (delay of about 2-5 seconds). If they keep clicking the amp outputs are next. Also, is there any indication on the front panel of what is failing?

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