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From: hunt@firqb.dec.com (Phil Hunt)
Newsgroups: comp.sys.mac
Subject: MacPlus resetting problem
Message-ID: <11838@decwrl.DEC.COM>
Date: Tue, 13-Oct-87 12:51:48 EDT
Article-I.D.: decwrl.11838
Posted: Tue Oct 13 12:51:48 1987
Date-Received: Thu, 15-Oct-87 00:45:32 EDT
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 13

>>	Within the past 24 hours, my MacPlus, configured with 1Mb of
>>DRAM, an external 800K floppy and an external separately powered 40Mb
>>SCSI hard disk, has started resetting itself.  Most frequently at power-up
>>but also after running for periods up to an hour.  When it starts, it will
>> ....dribble,,,dribble,,, ad infinitum....
 
I saw the same behaviour when the +5 voltage line goes too low, like below
4.82 volts or so.  Pop open you mac, check the +5 voltage line, then tweak the
pot until it gets above 4.85.   4.91 is ideal, I have been told.  I do not
remember the exact pins to check voltage on though, so maybe someone else
can recollect.
 
Phil Hunt