Pioneer SA-9500II - Tingling Sensation when touching faceplate or lid

[whoaru99]

I have attached two photos, of how I am measuring
- setup: one 1470ohm resistor between the 2 DMMs leads, then the black caiman goes to GND in my flat and the red goes to the amps lid. The DMM is in the 2mA AC scale.
- Method: The amp sits (literally hahahaha) on a plastic chair and the red caiman lead makes contact with the amps lid, giving the results.
Am I doing it correctly?

I'm not 100% certain, but what follows is my interpretation of how the test meter should be configured based on Yamaha's description.

The 1K5 resistor in series with the multimeter, shunted by 0.15uf.

 

[audiotemp]

The usual method is cap, resistor, and voltmeter all in parallel. Volts are measured and converted to current using Ohms law.

 

[Moncho]

I'm not 100% certain, but what follows is my interpretation of how the test meter should be configured based on Yamaha's description.

The 1K5 resistor in series with the multimeter, shunted by 0.15uf.

View attachment 3357383

Well that make sense ...
I just interpreted it different because Markthefixer wrote "For accurate testing, connect a 1500 ohm resistor across the DMM test leads and repeat your tingle voltage measurement.". So "across the DMM test leads", means to me what I have just done. But I will repeat the measurements, sadly I don't think I have a 0.15uF (ceramic) capacitor. I hope, that the measurement won't be invalid without it.

Thanks again !!!!

 

[whoaru99]

The usual method is cap, resistor, and voltmeter all in parallel. Volts are measured and converted to current using Ohms law.

Yeah, I think one could do that and end up with same result, but that doesn't seem like the arrangement Yamaha describes.

 

[Moncho]

Hi @audiotemp, hi @whoaru99

I just made the measurements following the advice of both of you, first measuring voltage and from there calculating current using ohm's law, and then measuring current directly. Both methods gave identical results . Unfortunately I do not have a 0.15uF capacitor on hand.

Now that the measurements are clear and the results are consistent (amp off 0.09mA and amp on 0.07mA AC), I believe it is safe to say that there are no risks in using the AMP. Isn't it?
However, I will have to find a replacement for C33, which is the safety capacitor. I will be very grateful if someone can offer me some recommendations for choosing this component.

@audiotemp @whoaru99 @markthefixer
Guys, I really appreciate your cooperation, help and willingness. You are really cool, Thanks