On Wed, Aug 9, 2023 at 07:31 AM, Chris wrote:
Check the resistance between ADC_3V3 and ground, also
from ADC_3V3 and the positive end of C106.
ADC_3V3 to Ground - Starts at about 12k when I touch the leads to
the ADC_3V3 and GND pins then increases to about 20k.
ADC_3V3 to positive end of C106 - ohmmeter shows an open circuit
on this path - no continuity or resistance measured.
This doesn't look right, the +Ve end of C106 and the positive end
of R112 should be connected together.
I think I've got as far as I can remotely, there are problems in
that area, it's tricky because the various components interact
with one another.? Maybe going through the circuit diagram
checking the connections between all the components will reveal
something not connected.
R112 measures 12k on the board
R110 does the same thing ADC_3V3 to GND does - starts at 10k-12k
and increases to a little over 20k before settling.
The low value to start with may be because C106 is charging.
Chris, G5CTH
