I got a scanner, i know it got a very simple circuit board because i open it once, but it need warm up if i didn’t use it for a month, if i use it yesterday, it won’t require warm up to function as normal. So what is the component that need to replace, i suspect it would be the capacitor, if it is the case, would the big capacitor fail 1st or the small one. Any electronic repair expert kindly give me some ideas, thanks.
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In the old days (and I do mean OLD days), electronic equipment used vacuum tubes to operate. In order to get the cathode to emit electrons for operation, a heat source needed to be applied to it. Literally, there was a filament whose job it was to heat the cathode. It took a few minutes to bring it up to full operating temperature. With solid state technology becoming more prevalent in the 1960’s, tubes began to slowly disappear and the old ‘warm up’ time was a thing of the past.
So warming up is not the problem with your scanner. Why it takes a long time before operating is a good question, but it’s going to take a schematic, some test equipment, and some analytical trouble-shooting to track down the problem.
And there a good number of capacitors inside there, each one with its own function.