Question about Teac A-H500 Amplifier

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Loss of audio output right channel

As described above, I suspect the audio amp has blown. The output has not gone completely, but is greatly reduced. I will check the outputs/cablingat rear. Any other suggestions ?

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  • 4,584 Answers

Take a look inside see if the amp uses transistors or an IC. If it uses transitors you can put a Ohm meter accross the leads (no power on) If it reads 0 (digital meter) or the pointer swings full over on the leads of any the transistors it's blown. If an IC then the thing might look damaged.

Posted on Jan 27, 2009

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I own a Aragon 4004 mkII. Recently the the banana plugs on the right speaker output touched bridging a contact. The amp had been turned on and left on for up to 10min with this short occuring. Now the...


Tough one. I repair these for a living. A number of possibilities exist. Likely output transistors are blown on the bad channel. Fuses are likely blown. If the fuses are BLACK inside, don't just put new fuses in, more damage WILL occur. This is a bit more than 'good with a soldering iron' will fix. You need to know how to test an output transistor. You need to look up the transistor type so you know what it is. A service manual will be a big help (I could not find one online.) If more than two outputs are gone on the one side, all should be changed, they are supposed to be MATCHED. Remove and replace all damaged outputs, or replace them all if two are blown. Find the driver transistors and check them for short circuits. After repair, start the amp on a dummy load of a 250watt light bulb to prevent destroying the amp if there is a problem. If you are unsure of any part of this, find an electronics technician to help.

Feb 20, 2012 | Amplifiers & Preamps

1 Answer

Preamp is not working,a main component has failed,do not know which component but do know that it is in the pre amp,will not turn on or power the other 2 amps


If you have lost both channels then it's something that is common to both that has gone. If one channel has gone, use the good channel as a guide. Here's what to do find the point where the pre-amp outputs to the power amp. With a screwdriver touch that point (make certain you only touch one metal point at a time = don't short anything). It should buzz! work backwards till the buzzing stops. It is easier to test with a channel working, but I think you will soon get to the faulty stage.
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PPS Don't touch any power parts with the screwdriver!

Jan 08, 2010 | Amplifiers & Preamps

1 Answer

Volume at 10 produces very low speaker output.!?


It sounds to me that all you are getting is the pre-amp stage of the amp and nothing from the power amp stage. As it is on both channels then it is something that is common to both. This could be something to do with the power supply of the power stage. Or whatever is on the heatsink. It could be that the amp uses a single audio amp IC for both channels. If it does my bet is that it's gone. If it uses two sets of semiconductors for the right & left channel it would be highly unlikely that both channels have gone, but not impossible.

Dec 27, 2009 | Amplifiers & Preamps

1 Answer

Roland KC-500 has power but no sound.


You need to determine if the power is getting to the audio amp section. For instance with the volume full up is it humming etc?
As a 'rule' it's unlikely that both left and right channels will fail at the same time (unless you have done something silly with the amp) you are looking for something that is common to both channels. Which is why the power section is first suspect. The exception to the rule (above) is where amps use say an IC power amp for both channels. You will find this IC on the big heat sink. Check whatever is on that anyway for damage or burning.
The only other area could be the pre-amp part. Again this could be a single IC controling both channels, so it's failure could cause a loss of sound. By the way if you can hear music/sound coming through when you put it up to full volume the pre-amp will be generaly good.

Nov 23, 2009 | Roland MMP-2 2-Channel Amplifier

1 Answer

I have a technics amplifier model SU-G75, it will power on but it will not play any of the equipments that is attached to it


You have basically the same problem as a chap with another amp on this site. So here's what I told him:
"You need to determine if the power is getting to the audio amp section. For instance with the volume full up is it humming etc?
As a 'rule' it's unlikely that both left and right channels will fail at the same time (unless you have done something silly with the amp) you are looking for something that is common to both channels. Which is why the power section is first suspect. The exception to the rule (above) is where amps use say an IC power amp for both channels. You will find this IC on the big heat sink. Check whatever is on that anyway for damage or burning.
The only other area could be the pre-amp part. Again this could be a single IC controling both channels, so it's failure could cause a loss of sound. By the way if you can hear music/sound coming through when you put it up to full volume the pre-amp will be generaly good. "

Nov 23, 2009 | Amplifiers & Preamps

1 Answer

I have a MPA 201 2 channel amplifier that just stopped putting out power, power light is still on, any suggestions?


You need to determine if the power is getting to the audio amp section. For instance with the volume full up is it humming etc?
As a 'rule' it's unlikely that both left and right channels will fail at the same time (unless you have done something silly with the amp) you are looking for something that is common to both channels. Which is why the power section is first suspect. The exception to the rule (above) is where amps use say an IC power amp for both channels. You will find this IC on the big heat sink. Check whatever is on that anyway for damage or burning.
The only other area could be the pre-amp part. Again this could be a single IC controling both channels, so it's failure could cause a loss of sound. By the way if you can hear music/sound coming through when you put it up to full volume the pre-amp will be generaly good.

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1 Answer

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You have a blown channel. If you are experienced with electronics repair, use the right channel to assist in diagnosing the left. Both channels should be efectively identical. In most cases, the defective parts are the output transistors. You should be able to A/B the output amp sections.

Let me know if you need further assistance.
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Jan 14, 2009 | Amplifiers & Preamps

4 Answers

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Remove the output transistors and measure each of the sets of 3 pads and report the voltage readings here. I suspect that you have either a blown driver circuit or output transistors. The voltage readings will give me an idea on where to start looking for specifics.

Thanks,
Dan

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1 Answer

No right channel output


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