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My amp as 60v dc current coming out of the speaker output on one side of the amp only.

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Hi again,

Any developments?

Posted on Jul 25, 2008

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2 Answers

I just purchased a Yamaha RX-V667. To keep it simple for start, I attached two 4ohm speakers to the Front speaker terminals. I also changed the factory set speaker impedance to 6 omh option. I am noting...


I presume that your amplifier is not working after the impedance was changed. If the speaker connections had shorted while this was changed with the power ON then it is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

Oct 22, 2011 | Yamaha RXV667 Receiver

1 Answer

The red power light is flashing slowly and i cannot turn it on i have tried pressing amp and the on button on the remote and the unit comes on for a second and then turns of


Hello,


Its usually not a fault that you will see unless somethings burnt up. This is solid state electronics and you don't 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 don't 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 that's why the protections coming on so you don't blow out your speakers. If you don't have any equipment or don't have any electronics experience I would then take the unit to a repair person for an estimate.
Good Luck in solving the problem.....

Dec 17, 2010 | Marantz SR7001

5 Answers

MY YAMAHA RECIEVER KEEPS SHUTTING OFF


The unit is going into protection mode. The message is a generic one and usually means that the output section is drawing too much current and has been shut down. Defective speakers can cause this, but in this case, I suspect that there is a problem in the front end that is allowing DC current to pass to the output circuits. This will cause a problem that will shutdown the system. Yamaha designs are not the most straightforward nad I would not suggest you attempt this repair without prior repair experience. Take this to a service center and request a detailed repair estimate and report the results here. Armed with that info, we canguide you further.

Dan

Jul 19, 2009 | Yamaha RX-V663 Receiver

1 Answer

Flashing protect


the protector comes on to keep the amp from further damaging itself or the speakers. The buzz you heard was probably 60HZ line buzz from the main DC supply conducting full current through one of your speakers through a damaged amplifier transistor. Your stereo will need professional repair. The protect circuit basically opens the speaker relay (and sometimes shuts down the unit) to prevent this DC voltage and current from getting to your speakers until the problem is corrected.

Jun 17, 2009 | Onkyo TX-SV727 Receiver

1 Answer

Noisy left hand power output stage. Noisy transistor? No circuit diagram.


If the speaker is not blown, there must be an output capacitor. If no output capacitor, and you have a blown transistor the speaker will blow from DC current. You can further check the transistors with a multimeter. A transistor looks like 2 diodes and you should be abobe to test with a mulimenter like a diode test.

May 12, 2009 | Audio & Video Receivers

2 Answers

Sony STR-DB940 Receiver Speaker Impedance Question


Whats the rating on the Plasma? How many watts at 4 ohms? If the plasma is rated 100 w at 8 ohm... hanging a 3.4 ohm load would put a lot of strain on the plasma's output amp. At 3.4 ohm the amp would be trying to delive close to 200 watts at full power. But it depends on how hot you normally run the volumn. Remember an amplifier output is AC volts. 1 ohm of resistance is close to a dead short. The amplifier would have to work its *** off to supply that type of power and would probably burn the output op-amps. If the outputs burn & it pumps any DC current through the speaker wire..the speakers would be toast...if not catch on fire. Try to keep the speaker load at or very cloe to the plasma's output load rating. Also if the plasma doesn't state it will handle loads down to 2 ohms...It probably won't.
Gene

Mar 02, 2009 | Sony STR-DB940 Receiver

1 Answer

Lab l4 bass amp smoked my speakers


Hi,
If your description is to be taken literally, and smoke did indeed come out of the speakers, your output transistors have shorted out, and put the full power supply voltage and current through your speakers.
The amp and the speakers will need to be serviced. The speakers will need new voice coils at the least.

Sep 30, 2008 | Audio & Video Receivers

1 Answer

I Have a Pioneer VSX9700S tuner amp, I short circuted the right side front speaker and now only the rear and center speakers work, Help!


This answer is generic:

The output stage most likely has damaged IC's and transistors depending on the exact design. This may also include the pre-drivers since most of these designs are 'DC coupled through the signal path.

An experienced audio service tech should be able to service this for you. Problems with blown output stages may tend to be expensive to service.

Jerry G.

Jul 16, 2008 | Pioneer Audio & Video Receivers

1 Answer

Nad 214 amp


problem is- intermittent speaker relay. You can cleaned contacts or better upgrade relay to better one (sealed)  Dariusz

Jan 03, 2008 | NAD 712

1 Answer

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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