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Right channel doesn't work only when it's set to stereo

L

lnette

New Member
Hello.

I bought a H/K PM660 not too long ago and I have been enjoying them ever since I got them fixed. Over the last few days though I noticed something peculiar. The right channel wouldn't work when it's set to stereo. When I set it to reverse, the right channel works, the left channel does not. When it's set to mono, both channels work.

My first guess is that the right channel on my amp does not work, and mono works only because the left channel is is processed to both left and right speakers.

And I don't know if this will help, but ever since I got my amp fixed, whenever I turn on the amp, the speakers made a very audible and loud "click sound," when that click was barely audible before I took it in for repair.

Is there anything I can do to check to see if the amp is repaird correctly?

Thank you
 
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lnette said:
My first guess is that the right channel on my amp does not work, and mono works only because the left channel is is processed to both left and right speakers.
Click to expand...
Yeah, I'd agree with that. Probably power amp has fault. Ideally an oscilloscope or audio probe is required to track it down.
Outside chance it's a dirty switch, you could try slightly rocking that mono/stereo switch back and forth and note any change.

lnette said:
And I don't know if this will help, but ever since I got my amp fixed, whenever I turn on the amp, the speakers made a very audible and loud "click sound," when that click was barely audible before I took it in for repair.
Click to expand...
A healthy/loud click is good. Maybe the tech replaced the protection relay or the timing cap, either way no issue.
 
mbz said:
Yeah, I'd agree with that. Probably power amp has fault.
Click to expand...

Nono, OP said the problem switches sides when speaker are reversed. That means the Power amps are both good, and the problem resides somewhere before the stereo switch.
 
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Okke 70s said:
Nono, OP said the problem switches sides when speaker are reversed. That means the Power amps are both good, and the problem resides somewhere before the stereo switch.
Click to expand...

does this mean it's a faulty switch or a faulty board, and not the power amp itself?
 
Okke 70s said:
Nono, OP said the problem switches sides when speaker are reversed. That means the Power amps are both good, and the problem resides somewhere before the stereo switch.
Click to expand...
yep, my bad, problem with google translate...
 
If the click you are talking about is audio coming through the speakers, rather than just a mechanical click coming from the chassis, it usually means that the DC balance at the output is not at 0 volts like it should be. To test put a set of voltmeter leads on the speaker output connections and see if the voltage exceeds 0 (+ or -10 mv). It it does, it needs adjustment or amp board repair. should be 0v

As far as the 1 channel, I would think a dirty switch, bad connection, or bad cap or other component in the tione amp/control amp section.
 
Tom B said:
If the click you are talking about is audio coming through the speakers, rather than just a mechanical click coming from the chassis, it usually means that the DC balance at the output is not at 0 volts like it should be. To test put a set of voltmeter leads on the speaker output connections and see if the voltage exceeds 0 (+ or -10 mv). It it does, it needs adjustment or amp board repair. should be 0v

As far as the 1 channel, I would think a dirty switch, bad connection, or bad cap or other component in the tione amp/control amp section.
Click to expand...

Thanks for the explanation! I'll make sure to get a multimeter to make sure that the volatages are good.
 
Okke 70s said:
It means it's not the power amps. From there on it's anyone's guess at this point. But I'd go with the tip of cleaning pod's and switches first. You can find an elaborate 'howto' right here.


https://www.google.com/url?sa=t&source=web&rct=j&url=https://audiokarma.org/forums/index.php?threads/the-idiots-guide-to-using-deoxit-revisited.207005/&ved=2ahUKEwjD5L267sHtAhVRUhoKHcHYA1cQFjAAegQIAxAC&usg=AOvVaw3ep4CkYidTUR9XDzai7EKA
Click to expand...

Thanks! I'll try this and let you know how it goes
 
so I ordered what I needed online, but the package got lost (sigh), and they're sending a replacement package.

but it seems like the stereo seems to be working again - so I think it was just a problem with the swtich not relaying the signal properly.

I'll update you guys when I get the package and service the amp, but in the meantime, I wanted to ask a couple more questions regarding the general maintenance of the amp, like how often I should use the DeOxit, and if it's okay to leave the amp on, even when nothing is playing, or should I turn it off every time I'm not using it, etc.

I'm still new to this world so I apologize if these questions are basic, but I want to take care of the amp because I really like it.

Also, thank you guys all for your help!
 
lnette said:
so I ordered what I needed online, but the package got lost (sigh),
Click to expand...

Arrr, yeh it happens. Think of it as suspense..

lnette said:
but it seems like the stereo seems to be working again
Click to expand...

Great! Give it a nice place: stable, maybe bit of dust protection overhead and with ample opportunity to ventilate.

lnette said:
how often I should use the DeOxit, and if it's okay to leave the amp on, even when nothing is playing,
Click to expand...

If all is well, you commonly use the amp and don't live in a permanent dust storm you should be able to do years without. On the other hand: once a particular pot or switch has some wear on it, it might play up every now and then. The amp will let you know.

As for leaving it on while not in use: better not, for say more then 10 minutes. It's not wearing out that much or anything, but rather a waste of energy.
 
Okke 70s said:
Arrr, yeh it happens. Think of it as suspense..



Great! Give it a nice place: stable, maybe bit of dust protection overhead and with ample opportunity to ventilate.



If all is well, you commonly use the amp and don't live in a permanent dust storm you should be able to do years without. On the other hand: once a particular pot or switch has some wear on it, it might play up every now and then. The amp will let you know.

As for leaving it on while not in use: better not, for say more then 10 minutes. It's not wearing out that much or anything, but rather a waste of energy.
Click to expand...


thank you for your help!

I've read somewhere on this forum that it wears down on the components if you turn it on and off too much, but I guess it was meant to do that, but I just wanted to make sure
 
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