Well, since you didn't buy the machine, I did. No one else bid, so the total cost was $7.77. I was very pleased with the cost, and after I got it working, left good feedback to the seller and sent him a picture of the thing playing solitaire. I told him it was a dirty reset switch...mainly because I didn't think he would understand what a tantulum capacitor was, or how it was part of the filter circuit. Since the reset contacts built onto the motherboard are within a 1/4" away in distance, I just told him it was that. Easier to explain and hopefully he will be pleased that I got it working since it didn't for him.
I had to pull the whole machine apart to figure out the problem. It wasn't the power jack at all. It had a blown capacitor
(see the top picture below
).
It was a hell of a deal for me, though one of the hardest soldering jobs I've ever had to perform. And to find a replacement Tantulum capacitor of the proper values took me forever. I literally spent 7 hours doing just that, and had to drive 40 miles to Grand Rapids to pick it up. That was one way too.
If I figure my time based on my normal pre-retirement salary of $27/hour, then this MP900 costs me $196.77. I could have bought one working and saved myself a lot of work. And that doesn't cover travel time.
Anyways, the capacitor came in and I mounted it in place after cleaning up from the previous owner who tried to do something with the motherboard. Not the neatest soldering job I ever did, but it is okay
(second picture with capacitor in place
).
Now I have a MP900 and a MP900C.
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pic1.jpg (161KB - 1 downloads) pic2.jpg (204KB - 1 downloads)