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Author Topic: The 27" k7500  (Read 1340 times)
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BadMonkey
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« on: September 12, 2016, 02:12:12 pm »

Anyone have experience rebuilding these? I did a pretty complete rebuild on this. This is from a golden tee fore. Game plays blind. No neck glow on the monitor. No b+. So I rebuild the monitor: cap kit, flyback, transistors in the power supply, new ic's. Replaced a couple resistors that were open. Have not tried it yet as I am waiting for a metal oxide resistor from Mouser electronics. Have I missed anything? This is a shotgun obviously but my question is does anyone have experience with the k7500 27"? I see john is picking up a "ninja turtles" and I think it has the same monitor. Or the 7400...? My sons 11th birthday is this Saturday and I was hoping to have it active in the arcade.
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just rebuilt another g07. On to the vector on Asteroids!
BadMonkey
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« Reply #1 on: September 18, 2016, 10:28:50 pm »

So the monitor turned out awesome. I did get some arcing at first on transistor q704. I thought it was arcing through the insulator at first but I realized that it was going from the screw to the collector. I put some electrical tape over the top so that arcing could not occur. Of course I removed it and tested it first and the rest of the circuit. I won't go into great detail about it here but the base and emitter are grounded and so is the heat sink, the tape sounds redneck but it works. There were a lot of components that I had tested and some were bad that don't come in any kit. The voltages all look good and I ran it for a couple hours and played a few rounds. I was nervous about turning it on but it looks great.
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just rebuilt another g07. On to the vector on Asteroids!
John's Arcade
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« Reply #2 on: September 19, 2016, 09:42:12 am »

Congrats! Sounds like you did a complete rebuild!
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BadMonkey
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« Reply #3 on: September 19, 2016, 10:12:10 am »

Almost. Didn't know how to properly test the ic's so I just replaced them.
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just rebuilt another g07. On to the vector on Asteroids!
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