Build Your Own Arcade Controls Forum
Main => Monitor/Video Forum => Topic started by: Captain_Dingo on November 13, 2005, 04:02:46 pm
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I've finally gotten around to getting the replacement parts for my K7000. I stripped it down today, and when I flipped over the chassis board, I found a few extra parts from previous repairs. I want to verify what I'm seeing with others and get any comments from the experts.
- There is a jumper wire from the negative pole of C45 attached to a ground point. I'm assume this is due to not being able to get a solid solder joint on that leg when the caps were replaced by the previous owner.
- There is a capacitor attached between the negative pole of C50 and the leg of R75 that is connected to C52. I don't know why this is there.
- There is a 650 ohm resistor attached across R83. I believe this is the same value as R83, so I'm wondering if the original resistor is bad (open). I haven't had a chance to desolder anything yet to test that theory.
- There is a 330K resistor attached across the vertical hold pot. I assume this is just to change the resistance of the pot and put it into a range that allows the control to work properly.
A picture of the back of the board is attached. Can anyone confirm my assumptions and also comment on the ones I wasn't sure about? Are any of these common repairs or fixes to this chassis? When I put the new caps in, should I just leave all of these extra pieces around? My plan here is to swap the caps and the flyback using the kit I got from Bob Roberts.
Thanks!
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That actually may be factory work. I've seen a lot of chassis' with similar parts on the solder side.
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Yes, those were all put there at the factory. Leave those parts alone.
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Point taken :)
Thanks for the help. The only reason I assumed it was from a prior recap is that there's some blackening on some solder joints as if someone got them too hot while working.
I'm off to heat up the iron...