I recently had a battery leak on my U1242B. I cleaned up the corroded contacts the best I could. I also had one of the contacts on the back of the PCB corrode slightly where the battery cradle contacts touches the main board. There wasnt any other battery damage I could see. It was working fine until today.
Now I constantly get an AErr with both leads plugged into the COM/T1 sockets unless I move the rotary to A. It seems to think a lead is plugged into the A socket.
Is this something easily fixed?
Hello munkeyjooce, I just ran into the same problem with the same meter and found your post in the forums sadly with no response. However, I managed to fix the issue on my meter in my lab. The steps to fix it were as follows:
I am not exactly sure that it was a hardware issue. I think the meter had become tricked in software into thinking a probe was plugged into the A socket. There did not appear to be anything wrong mechanically with the A socket. I think by toggling the probe detection switches in a certain order, the software reset itself back into a normal mode.
Good luck. I hope this comment helps you in some fashion.