April 23, 2024, 05:09:31 pm
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R728 is the resistor through which the b+ supplies the horizontal drive transformer T701. If the transformer isn't supplied the monitor doesn't work. 2W sounds a little low, I would upgrade to 3W or 5W. The cracked component is not a resistor but an inductor, L704 0.82uH. The horizontal signal to the HOT passes through this component. If it's bad the monitor doesn't work. It's not open as your resistance reading shows but it looks in bad condition and it's advisable to replace it. Q708 shouldn't be replace unless a test out of circuit says it's bad.
Have you seen this? https://forums.arcade-museum.com/showthread.php?t=193468
Quote from: princess prin prin on June 04, 2018, 12:56:02 pmR728 is the resistor through which the b+ supplies the horizontal drive transformer T701. If the transformer isn't supplied the monitor doesn't work. 2W sounds a little low, I would upgrade to 3W or 5W. The cracked component is not a resistor but an inductor, L704 0.82uH. The horizontal signal to the HOT passes through this component. If it's bad the monitor doesn't work. It's not open as your resistance reading shows but it looks in bad condition and it's advisable to replace it. Q708 shouldn't be replace unless a test out of circuit says it's bad.Thanks for the help. I looked up that inductor on digikey and can't find a .82 uH. Everything I see is at least 1.00uH and above. Do you happen to have a link to what I would need to replace the inductor with? I'm having troubles testing this transistor as I'm getting confused. I haven't tested too many transistors and it seems the pinout for the c2482 is different than most so when I go to follow along with a video I get mixed up.
Thanks for the reply security0001. I think I may have found out what the issue is. I may be missing an upgrade kit for this chassis which is causing R728 to burn up. Do you happen to have the parts for the horizontal upgrade including the heat sink? It's the first page in the PDF I've attached. PS. If I'm reading the upgrade kit correctly R760 used to be 470k, but should now be replaced with a 100 ohm resistor? I'm a little confused.