Question about Teac AG-V8080 Receiver

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1 channel noise

Every time I turn it on, there's a noise in one channel even with no input signal provided. I can't get it to service 'cos we in Russia have no Teac Audio customer support. Hope someone can help me to find schematic diagram. Maybe it's possible to fix it with some welding. Thanks.

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Posted on Jan 02, 2017

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SOURCE: Teac Receiver lost AM and FM

Well, if your unit had that happen, it sounds like it is possible. ;)

I would imagine that the radio, like all the other inputs, is in itself a separate unit or circuit board. If something fails on it, it probably wouldn't harm other inputs or the actual amplification itself... just a guess on my but it makes sense. A repair shop could probably open up the case and visually inspect the tuner circuits to make sure there isn't a short or dead something somewhere.

If there is still sound in Jim's case, I would try a different antenna and/or make sure its hooked into the correct antenna hookup. if sound but antenna change doesnt help, it could still be an internal but maybe simply problem.

i'm no pro but that's my 2cents


Posted on Jun 01, 2008

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SOURCE: Teac AG-V8520

same problem exactly

Posted on May 31, 2010

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1 Answer

Wont receive digital channels after scan non found


Hi Patrick,

You must have a UHF / VHF antenna connected to the antenna input of the TV to scan for digital channels. Most new TV's have a threaded, round 75 ohm coax cable connection for this - but yours might even have connection consisting of 2 small screws to connect a 300 ohm twin lead antenna cable instead. Use which ever yours has.

If you are using this input for the input of a cable TV "set top box" (STB), satellite STB, or similar, you will likely only find a single analog channel (Ch3 or Ch4) after a scan as the scan will only find the output of the STB - which is usually on Ch3 or Ch4 - and not be able to scan the STB channels.

Additionally, the antenna input of the TV will only provide a standard definition picture if connected via coax cable from the STB. It will only provide a high definition picture if connected to a UHF / VHF antenna and a broadcaster is close enough for its signal to be received by the antenna. The way to obtain the best possible picture (high definition) when using an STB for tuning channels is to use an HDMI cable between the STB and TV. An HDMI cable will provide the very best picture and audio signals from the STB to the TV; all over a single cable and is the recommended practice.

I hope this helps!

Dec 26, 2014 | Televison & Video

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I have a Peavey 8600 amplifier. It sounds great but when only operating vocals, in order to get the highs of your voice just right, the speakers put off a large amount of white noise. While singing, you...


There is not enough info here to provide a complete answer, but let me give you some background:

There will always be some hiss. This is due to general amplification where a small amount of noise is amplified along with the general signal. In most cases, the signal is strong enough to overpower any noise that is present (vocals in your example). This noise should not be that noticable in normal cases. If there is an automatic gain control in the line, this could account for it as with "silent" times, the gain will automatically be increased potentially to the degree where the noise is noticable.

Barring that scenerio, if the input signal is too low, the overall gain necessary to produce reasonable volume at the speakers will also be such that the noise is noticable. In order to track this down, please provide details about the current setup including:

1) Microphone make and model being used
2) Input being used on the mixer
3) Gain level being used for the mic channel
4) Gain level being used at the master level.

Dan

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1 Answer

A 16/4 channel Mackie VLZ bought new 1997 hardly used. Some times a channel goes quiet, sometimes the fault moves to another channel, or while setting a channel input signal the knob seems to work till...


I suspect you MAY have a severe ground loop. The green light indicates channel crossover if nothing plugged in.

MAKE SURE ALL connected equipment is powered from the SAME receptacle. If you service amps from receptacles at one end of the room and this board from the other end, you are ASKING for trouble.

Read up on "common mode" as it pertains to balanced lines. Equipment can be at risk if grounds "bounce" as they often do.

When green light with no inout shows up, slide all faders down first. Then unplug input lines one at a time... turn off the amps and then unplug the output lines one at a time. See if one of these inout or output lines was causing the green light.

You should be using BALANCED lines to your amps... either XLR or TRS types at both ends.

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I have a 42inch lcd polariod tv and the screen comes up blue no picture or sound


It could be the blanking circuit displaying a blue screen if no or a weak signal is connected to the TV. If you have a DVD or VCR try to see if you get picture and sound when ether of those devices are connected to the auxiliary input. If yes your signal input is weak, or you are getting no signal at all. If you go into the TV do you see text? If yes make sure you’re on the correct auxiliary input. If no text is visible the problem is internal and the LCD driver circuit needs to be repaired. If you see text and you are on the correct auxiliary input, but you get no picture and sound then the problem is internal and the front end tuner needs to be repaired. If you see video and hear the sound make sure your channel is correctly selected and set to a working channel. If you have a cable box remove the input to the box and connect it into the coaxial input on the TV and see if you have a picture and sound. If you do the cable box is defective. If you do not see any channels the cable may have lost its signal, and you should connect the cable to another device to check the signal quality. If you have a satellite service provider, and you use a known working device to check the signal and the device works then the TV needs to be serviced.

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Does anyone has overheat problem with Behrigher EP2500 power amplifier? We had the amp for abut a year. The amp. has recently become overheat (hand burning) after 30 minutes operation. We set the gain to...


The last time I had a problem like this there was a defective transistor in the from end that was generating noise in the 30K range. Too high to hear and too high for the speakers to reproduce, but enough to put quite a load on the amp. Does this occur even with no speakers attached? If so, then put an osciloscope on the outputs and look for signals. WIth no input, there should be no output at all except for a little noise. You can also see if there is any DC on the outputs as well.

Please update this with what you find.

Thanks,
Dan

Oct 13, 2009 | Behringer EUROPOWER EP2500 Amplifier

1 Answer

6 mnths old Alto L8 Mixing desk developed hiss on channel 1 only.


The slider or the amps for channel 1 may have a problem.

Sliders do wear out.

Try shorting channel 1 input and see if that affects the noise. A hissing noise is probably a bad preamp chip. That is shop work at a repair facility.

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1 Answer

When power turned on the tv clicks on of then finally comes on after several mins


Follow this procedure to troubleshoot if the television makes a clicking sound.

NOTE: If a Sony® television with the TV Guide On Screen® system is being used, and is not getting a TV Guide signal, a clicking noise may be heard every 5 to 10 minutes.To keep this from happening, perform a factory reset and do not enable the TV Guide On Screen system during the set up.
  1. Change the channel or video input of the television.IMPORTANT: If the noise only occurs on a specific channel or input, the issue may be with the signal being received. It may be necessary to contact the signal provider.
  2. Turn off the television.
  3. Ensure that any Audio/Video (A/V) components are connected to the television properly.
  4. Remove all third party Audio/Video (A/V) components connected to the television.NOTE: If the issue resolved after removing third party A/V components, one of those components is the cause of the issue. To determine exactly which component is causing the issue, reconnect each A/V component independently and check the status after each component is connected.
  5. Unplug television power cord from the AC outlet.
  6. Let the television set without power for 30 seconds.
  7. Plug the television power cord back into the AC outlet.
  8. Turn on the television.
  9. If the issue is still unresolved after completing all of the troubleshooting steps, service may be required.

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1 Answer

Problems connecting turntable to amplifier


I hope you have it connected to the Phono input on the left rear of the receiver. Otherwise the minute signal generated by the phono cartridge is too small for the other inputs to process.

The buzzing noise/bad channel is probably a bad connection in the tonearm/headshell connection or one of the 4 wires attaching the cartridge to the shell. If you DON'T want to blow up your speakers, TURN YOUR RECEIVER OFF, turn the volume to 0 or select another input before messing around with the tonearm.

Swap the two channels from the tonearm to the Phono connectors to prove the buzzing is external (at the turntable). I think the Dual CS415 uses the old standard headshell. With the volume down flip the lever toward the back, carefully remove the assembly and look over the tiny multi-colored wires with the brass crimp-on ends. We're looking for tight kinks or broken wires. Then put it back. maybe reseat it a few times to wear off any oxidation and try it again.

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1 Answer

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Good Day, ant197904;
Sounds like you need service, try a video input, how does the DVD look, for your TV or Signal Provider. Good Luck, big IRISH.

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I just got the same exact one, when it searches automatically the first time it doesn't look for digital channels. go to Menu>manual channel search>cable. it will look for all possible signals and will take forever probably. the free digital channels will take several seconds to switch channel to channel, but they're there! They will show up on your screen as "DC 91-2" or similar. you can switch back to regular cable channels with the input button, you just cycle through all the inputs. hope that helps.

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