Well got too excited, as soon as I tested the unit powered up battery installed it read pin 1- 7.18 and 3-4.99 and then it crashed while testing so I tested battery in and 1 was5.15 and 3 was 3.642.
I then tested no battery and 1 was 5.54 and 3 was 4.04 and now won't boot with the 3.6 volt battery. .
The input voltage is too low, it needs to be at least 7.5V, with an absolute minimum of 7V. So 7.18 is already quite low, 5.15 won't work as you can see the output is only 3.64V, not nearly enough for all the 5V logic to work. Could be a few things, transformer, bridge rectifier BR2 or somethings is drawing too much current on the 5V line. Can you measure the AC voltage coming from the transformer? From what I can see it should be the 2 yellow wires on the connector next to BR1 and BR2. you should also be able to measure it on BR2 pin 3 and 4. BTW don't forget to put the meter on AC voltage!!