I have a GMC-200 that my mother gave to me to "fix". The only obvious problems that I can see are a couple of SMC resistors (probably resistors) that appear to have... disintegrated. I have no idea what the story is behind it no longer working, but I thought I'd ask here if there is a way to find out what the values are of the pieces that seem to be broken.
I've attached a picture with a red square over the components that are obviously broken, and an arrow to a black component that may or may not have burnt.
The red arrowed component is definitely dead. It may be a diode. Put an LED in...
It looks like you could pull out the right resistor from underneath the DC in. Maybe you can read it's number. Youre missing only one number. Between the 2 and 0. Try to make it out by a close examination of the remaining parts and then put it in here: h**p://www.hobby-hour.com/electronics/smdcalc.php
GMC-300E+ V4.20 with sbt-11a alpha tube
My statements are "stuff-a-hobbyist-says" and not in any way professional.
Cool. Interesting threads that you found! Anyway, there could be something else broken, but the two 2R0 are just used as fuses. They are 2 Ohm resistors. You COULD just short the contacts. I don't think it's important if the value is under 2 Ohm. But it's obviously not advisable to do so. It looks like your mom tried to use a 12V DC adapter or something like this. You should check this before giving it back or she'll blow it again. (Your mom blows, dude!) xD