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-   -   Topping TP-60 - help with diagnosing fault (http://www.diyaudio.com/forums/class-d/222372-topping-tp-60-help-diagnosing-fault.html)

achinz 28th October 2012 01:26 AM

Topping TP-60 - help with diagnosing fault
 
The Topping TP-60 from eBay (e.g. but not the actual seller: http://www.ebay.ca/itm/Topping-TP-60-TA2022-T-Amp-2x-80W-Tripath-Stereo-Amplifier-TP60-HiFi-/200824559637) arrived with a fault demonstrated through moving the volume knob:

The volume knob is minimum at the 6 o'clock position - setting it higher than the 7 o'clock position, only the left channel works.
But when I turn the volume knob down just before the minimum 6 o'clock position, the right channel sounds very loudly (like the maximum) but now the left channel has no sound!
There is a crackling noise at that position turning it up or down.

I would greatly appreciate any help with diagnosing whether this is simply a faulty pot or something more complex in which case I would have to cut my losses with a return. TIA.

I hope this pic shows the issue a bit better:

http://img526.imageshack.us/img526/5...gt60faults.jpg

nigelwright7557 28th October 2012 02:09 AM

I would start by cleaning or replacing the pot.

achinz 28th October 2012 07:57 AM

Thanks for the tip, nigelwright7557.

How would one clean what looks like a closed unit?

And as I'm not too experienced, I would need some help to replace this type of pot as I can't see the usual pair of three terminals for soldering the input wires in the more conventional pot: see photo below
http://img213.imageshack.us/img213/7...0potfronts.jpg

achinz 29th October 2012 10:31 PM

Anyone else, please? - I guess the connections to this pot would be on the solder side of the circuit board and it would be just a case of removing the extant pot before replacing it with the new pot and following the same soldering points?

nigelwright7557 29th October 2012 11:36 PM

Contact cleaner usually comes with a straw that can be bent underneath the pot to squirt cleaner inside the pot.

You should be able to find a replacement with the same or similar pin outs.

achinz 30th October 2012 03:14 AM

Thanks again, nigelwright7557 !

wolf_teeth 25th January 2013 03:28 PM

Contact cleaner can actually make pots go bad faster. Please use Deoxit Faderlube.
Wolf


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