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From: rashid@magnus.ircc.ohio-state.edu (Robert G Rashid)
Newsgroups: comp.sys.mac.hardware
Subject: Mac+ power supply
Message-ID: <1991Mar4.022126.29609@magnus.ircc.ohio-state.edu>
Date: 4 Mar 91 02:21:26 GMT
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I have a mac+ with what appears to be a slightly low voltage power
supply.  I had previously complained in c.s.m.h. about bombs when
inserting disks, which lead to a recommendation to purchase Larry Pina's
excellent book on mac upgrade and repairs.  With this book and my
limited skills, I have been monitoring the 5 volt supply from the disk
drive port.  What I see is a voltage that starts at about 4.98 and, over
the period of an hour, rises to 5.01 or 5.02.  This rise is consistent,
and usually, when the voltage is at 5.01(2), the voltage drop when
inserting a disk does not cause a system crash or reset.

My question(s):
 - Is this voltage change normal?
 - Is it ok to set the initial voltage (when cold) to 5.0 volts? (if set
to 5.0 volts initially, will the 'warm' voltage of 5.3(4) be too much?)

Many thanks for any thoughts.
-- 
  | Bob Rashid                |   Rashid.1@osu.edu |
  | College of Dentistry      |   305 W. 12th Ave. |
  | The Ohio State University | Columbus, OH 43210 |