radio10 wrote in message
...
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?


Broken wire in the lead to the temp sensor/thermocouple ?