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From: prgclb@ihlpa.ATT.COM (Blesch)
Newsgroups: comp.misc,comp.sys.mac
Subject: Re: Leaving a Mac on 24hrs (power supply)
Message-ID: <5180@ihlpa.ATT.COM>
Date: Fri, 21-Aug-87 09:15:25 EDT
Article-I.D.: ihlpa.5180
Posted: Fri Aug 21 09:15:25 1987
Date-Received: Sun, 23-Aug-87 01:05:36 EDT
References: <735@ubc-vision.UUCP> <5030001@hpccc.HP.COM> <2693@husc6.UUCP> <4042@utai.UUCP>
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 25
Summary: flakey mac power supplies
Xref: mnetor comp.misc:1082 comp.sys.mac:5832

In article <4042@utai.UUCP>, dudek@utai.UUCP (Gregory Dudek) writes:
> 
>    I've been leaving my Mac+ on 24hrs since I got it about a
> year ago with now problems.  It's not even in an air conditioned room.
>    I have noticed, however, that if I do turn it off for a while
> the screen gets all "jumpy" for about 10 or 20 minutes until it
> seems to get nice and cookin' again inside.

I just got a new power supply in my Mac 512K enhanced (I've heard
from more than one Mac owner that power supplies aren't the most
rugged component, to put it tactfully), and I noticed the same thing.
The screen is fuzzy for the first several minutes.  Patterns with dots
close together (like the desktop and the scrolling bars) shimmer, and
letters aren't very crisp.  After a while, things look okay.

One other oddity -- not really a problem, but an annoyance -- the
screen image is not truly centered on the CRT -- it's slightly off
to the left.  I see the whole image, but there's a narrower "margin"
on the left side than the right.

Are these things normal?  I'm going to ask the repair person, but
I'd like to collect other informed opinions . . .

Thanks,
Carl Blesch