Path: utzoo!attcan!uunet!lll-winken!ames!mailrus!cornell!uw-beaver!mit-eddie!bu-cs!dartvax!eleazar.dartmouth.edu!stevel
From: stevel@eleazar.dartmouth.edu (Steve Ligett)
Newsgroups: comp.sys.mac
Subject: $300 Mac II ADB fuse repair
Message-ID: <11984@dartvax.Dartmouth.EDU>
Date: 27 Jan 89 15:19:59 GMT
Sender: news@dartvax.Dartmouth.EDU
Reply-To: stevel@eleazar.dartmouth.edu (Steve Ligett)
Organization: Dartmouth College, Hanover, NH
Lines: 19

I was playing around with the ADB on a Mac II, and after a while, the
keyboard and mouse no longer worked.  I had blown the fuse on the
motherboard that supplies power to the Desktop Bus.  I took the Mac II
downstairs to the shop, and asked, "How much does it cost to fix this?"
"Oh, about $300", they said.

The standard repair is to replace the motherboard.  The fuse (F2, I
recall), is a little PICO II fuse that is soldered to the board.  I
found them in my Digi-Key catalog for $3.23 for 5, part number F826-ND.
It's a one amp fuse, though the hardware reference cautions against
drawing more than 1/2 an amp from that port.  A 1/2 amp fuse is part
number F824-ND, and a 3/4 amp one is F825-ND.

Even though the Mac II wasn't even mine, I repaired it by replacing the
fuse.  Shhh, don't tell, ok?  I can't recommend that you do the same.
Next time, I'll use an old Mac II that doesn't have an ADB fuse.

Steve Ligett       steve.ligett@dartmouth.edu or
(decvax harvard linus true)!dartvax!steve.ligett