A little background on why/how my battery cover broke: My 200 stopped working
altogether, so I decided to open it up and see if anything had gone awry. I of
course wanted to remove the batteries, and in doing so (gently, as usual), the
door broke.
More importantly though, I found what I think was the culprit. When I acquired
my 200, the batteries that were in it had long since gone "bad", and corrosion
had taken over. It destroyed traces on the keyboard and ruined the wires that
connected the battery bank to the mobo. I replaced the keyboard, the wires, and
did a general tidy-up inside. Boom, worked like a champ!
However when I opened it this time I found that thermistor TH3 had literally
come apart; The lead on one side had separated from the body of the thermistor.
According to the parts list, it is a 10KOhm thermistor, but it doesn't state
whether it's NTC or PTC, nor does it give the B constant. Without that
information, I took a gamble and soldered in a 10KOhm resistor just to see if
that would do the trick. Low and behold it works!
The manual says the thermistor is for stabilizing the reset circuit. How
critical is it that I use a thermistor instead of just keeping my fixed
resistor in there? Anyone know for certain and/or have experience with this?
-Joe
