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Power Supply Circuit Description -VR605/Q605 detect overvltage. At about +43v Q605 latches and blows F600. -Q605 and associated parts are crowbar overvoltage protection. If +12v rises above +15 or +27.8 rises above 43 then Q605 latches and blows whichever fues is supplying power -U615 regulates in put votage to T660 so that the +12v is +12v -S605 in 11-14v range uses a different set of taps on T660 and the output voltage from Q607 will be lower to match.
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This Document was scanned from the original Tektronix Service Manual For enquiries about high quality technical manuals Qservice@otenet.gr...