Need data for MacPlus Video board schematics re: MOV failure

Article View: comp.sys.mac

Article #6792

#6792

From: Greg Shippen
Date: Fri, 20 Oct 1989 21:00

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I am having problems with my MacPlus.  It exhibits complete power failure to
both logic and sweep sections.  I have traced the problem to a component in the
AC path on the video board.  The device is an open circuit -- a distinct problem.
I believe the device is an MOV used for transient suppression.  It is labelled
R39 and has the following lettering written on the component "CAL-R 2SS20".
Does somebody have a schematic of the video board?  I would appreciate concrete
word on what this component is and what the specs are of the device.

BTW, the video board has the part number "630-0102-J".  I'm not sure of the
first 3 digits as they are obscured, but I am certain of the last five.  The
data code on the board is "86 40"

Any help would be appreciated.  As usual, the Apple dealers disavow any knowledge
of Apple's schematics!
-- 
Gregory B. Shippen
MIPS Computer Systems, Inc.                    {ames,decwrl,pyramid}!mips!greg
928 Arques Ave.                                greg@mips.com
Sunnyvale, CA  94086 (408) 991-0441

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!apple!mips!greg
From: greg@mips.COM (Greg Shippen)
Newsgroups: comp.sys.mac
Subject: Need data for MacPlus Video board schematics re: MOV failure
Summary: I have no power to my MacPlus, I think a MOV failed but what is R39
Message-ID: <29800@rapid.mips.COM>
Date: 20 Oct 89 21:00:26 GMT
Reply-To: greg@mips.COM (Greg Shippen)
Distribution: usa
Organization: MIPS Computer System Inc.
Lines: 19