IMO, the weak link of the meter's front end is that 15V diode check mode. I marked the switch to make it easy to follow on the schematic.
Also, note that a while back another member had posted some good pictures of their switch showing a fair amount of contamination in this same area. I am not sure why it would accumulate here.
A bit of damage for a low energy source. Is there more to this story??
Hello, thanks for the post yeah still a little at a loss. I think there might be an issue with your labeling here is why I think so:
The inside row on the PCB has pad pattern when read from right to left (ignoring routed connections):
ROW 1 _ _ _ __ _ __
One row further in you see:
ROW 2 __ _ __ _ __
On the schematic:
Reading pins 34, 33, 13, 36, 12, 11 follows the following pattern:
_ _ _ __ _ __ <- Pattern matches ROW 1
Reading pins 35, 16, 37, 15, 14 has the following pattern:
__ _ __ _ __ <- Pattern matches ROW 2
However, a discrepancy exists where:
1. 13 and 11 are ground, buzzed out to the current shunt
2. 14 and 16 are connected to FB4, buzzed out to ferrite
Lets refer to these as Pair 1 and Pair 2 respectively.
It appears these pairs have been swapped on the PCB.
From Joe's annotation if you measure what is labeled 37 and 15 you get an open circuit, on the schematic these should be a short.
Whereas if you measure between 12 and 36 it is a closed circuit indicating these rows are swapped.
Attached are what I believe the connections to be.