Topping TP-60 - help with diagnosing fault - diyAudio
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Old 28th October 2012, 01:26 AM   #1
achinz is offline achinz  Australia
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Default 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:

Click the image to open in full size.
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Old 28th October 2012, 02:09 AM   #2
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I would start by cleaning or replacing the pot.
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Old 28th October 2012, 07:57 AM   #3
achinz is offline achinz  Australia
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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
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Old 29th October 2012, 10:31 PM   #4
achinz is offline achinz  Australia
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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?
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Old 29th October 2012, 11:36 PM   #5
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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.
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Old 30th October 2012, 03:14 AM   #6
achinz is offline achinz  Australia
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Thanks again, nigelwright7557 !
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Old 25th January 2013, 03:28 PM   #7
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Contact cleaner can actually make pots go bad faster. Please use Deoxit Faderlube.
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