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From: cruff@ncar.ucar.edu (Craig Ruff)
Newsgroups: comp.sys.mac,sci.electronics
Subject: Mac Power Supply Part Number Question
Message-ID: <4355@ncar.ucar.edu>
Date: 16 Sep 89 19:00:14 GMT
Reply-To: cruff@ncar.UCAR.EDU (Craig Ruff)
Distribution: na
Organization: Scientific Computing Division/NCAR, Boulder CO
Lines: 12

The power supply on my Mac Plus is in a near-term failure mode.  It seems to
loose all power occasionally (like a power hit), causing the screen to shrink
and blink off and the system to reset.  Since it's out of warranty, I thought
I'd see if I could find the guilty component my self.  The part number I
didn't find an equivalent for is Q11: "NEC C2335 L31B", which seems to be a high
voltage power transistor or SCR on a heat sink.  Does anyone know the
equivalent for this?  Does anyone know which parts fail commonly in this
power supply (besides the flyback transformer)?
-- 
Craig Ruff      	NCAR			cruff@ncar.ucar.edu
(303) 497-1211  	P.O. Box 3000
			Boulder, CO  80307