When my 5065A had its oven failure, it got so hot that it melted all of the solder joints on the lamp board. I resoldered the joints, rewound the oven winding, and foamed the unit with some spray can urethane (Great Stuff), and had it working again for a couple of years. Then something else failed.
I'd sure like to fix it, but Scott McGrath, representing himself as an employee of Harvard University, borrowed my manual more than a year ago, and refuses to return it. Oh well! -Chuck Harris John Miles wrote:
One big favor you can do your 5065A is to check the ESR of the electrolytics on the A11 oven driver board. C23 and C24 were open on mine, as was the other instance of the same 20 uF cap on the battery-charger board, and the lamp driver assembly had experienced overheating to a point that was sufficient to char a resistor and crack it open. I'm not sure how, or if, those two caps would cause total control-loop failure, but there was apparently nothing else wrong with this unit that could explain the overheating. -- john, KE5FX
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