In poking around in my JVC hall synthesizer ("not that again!"), I discovered that the voltage regulators have an "IC protector" in front of them. The ICP-N38 for the 7805 +5V regulator is blown (ie, open). This might be the reason the unit is acting funny. (There could be other problems. I'm still poking.)
Obviously, I have to check "downstream" and make sure there are no shorts. But I was wondering whether these protectors ever fail spontaneously.
Thank you.
Indeed they do William. I replace them all the time with no valid reason found for their untimely demise, and no bounceback a week later.
Arfa
shorts.
Thanks. That makes me feel a lot better.
May the humble fisherman make another request of the magic flounder?
My gut feeling is that the ICP was slowly deteriorating, choking off the current as the unit played, then "recovering" as it sat overnight.
Have you seen anything like that?
I've seen them go high resistance rather than totally open, but not intermittently as far as I can recall. Are they the little TO92 style ones ? If they've got an "N" number for the rating, I guess they are.
Arfa
?
No, they're more like little rectangles than flattened cylinders.
OK. I guess that I've probably come across such at some time, but not commonly. The ones that I most often see, are the TO92 style ones, and the little yellow cylinder ones with rounded ends. Both of those types fail for no apparent reason, so I guess there's no reason why your type shouldn't do the same, either.
Arfa
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