Voltage checking with Multimeter


I have only just assembled my HIFI Berry analog( not digi) after purchasing it some months ago.
I am not able to get sound from the HIFI berry jack.

I'm using Volumio ver 1.4.
Without the HiFI berry I can get sound from onboard with volumio and also Open elec
With Volumio, after installing I2S driver on GUI , alsa -l does detect the DAC as below:

**** List of PLAYBACK Hardware Devices ****
card 0: sndrpipcm5102a [snd_rpi_pcm5102a], device 0: PCM5102A HiFi pcm5102a-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0

But no sound from HIFIBerry jack.

As per advice in the forum, I checked continuity on the self soldered P5 header with multimeter.It seems OK.
I want to do the voltage test but am clueless as to where to put the red and black probes.

The advice is black to the negative of P3--QUESTION:is this the GND of the P3?( last after the square pin?)

The red to C10 and C12 at a time. QUESTION:Are these the C10 and C12 points on the Pi board to the left of the HDMI socket? These seem to have 2 ends ( C10 has ?2 ends) so which do I use for the red prob tip or does it not matter?

QUESTION: Do I do the voltage check with the HIFI Berry fixed to the pi or off?

Grateful for any advice.
Many thanks



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