I have my son's Weller EC2100M unit on my bench to take look at.
This is the one where the iron does not have the magnastat thingy and it is the Station that digitally displays temperature and the operator adjusts the temperapture from a knob on the front.
However, the temperature will not adjust. Upon switch on the unit displays the rising temperature which stops at 550C. At this point the iron tip is red hot!
I was dismayed to find a largish microprocessor inside (4 MHz clock crystal operating ok) along with another programmable 8 pin chip plus an op-amp a triac and 5 volt reg. All surface mount:-(
The regulator and triac check out ok.
Anyone got this unit and had any experience like this?