9 Apr
2008
9 Apr
'08
11:58 p.m.
I've just brought up a Mac SE/30 with fresh disks and noticed that the
monitor occasionally gets wavy or shudders. How should I proceed in
fixing this?
For those interested:
Apple has all sorts of old stuff at
http://www.info.apple.com/support/oldersoftwarelist.html You'll need the
Linux version of Stuffit from
ftp://ftp.allume.com/pub/archive/linux/StuffIt/stuffit520.611linux-i386.tgz.
Unstuff the file you get from Apple, the Unstuff the .data file. Then
make the disk like this: dd if=System\ Startup of=/dev/fd0 bs=84 skip=1
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
10 Apr
10 Apr
5:46 a.m.
--- David Griffith <dgriffi at cs.csubak.edu> wrote:
I've just brought up a Mac SE/30 with fresh disks
and noticed that the
monitor occasionally gets wavy or shudders. How
should I proceed in
fixing this?
When you say fresh disks, did you mount two internal
hard disks inside the SE/30? Because I did that once,
and the magnetic field from the disk interfered with
the monitor. I had to make up a bracket to move the
second disk an inch farther away from the picture
tube. But, in my case, it was because the magnets in
the disk were bending the lower corner of the screen -
it wasn't moving wavy, it was fixed wavy.
You're probably going to need to replace a couple of
capacitors on the analog board. There's one particular
capacitor that comes to mind as causing a different
problem, it's nonpolar, so watch out. Is it like a
60hz kind of a wave in the picture, or is it more
random? A wave through the screen, like a waving flag?
It's been a while since I fixed one of these, so I
don't remember off the top of my head. But I have a
book at home, forget the name, but it's a Macintosh
repair guide that has a lot of good info to help
pinpoint failed parts. It has a purple cover. Anyone
remember this book? This is going to drive me nuts all
day. :)
-Ian
6:18 a.m.
Perhaps the Dead Mac Scrolls?
John
But I have a
book at home, forget the name, but it's a Macintosh
repair guide that has a lot of good info to help
pinpoint failed parts. It has a purple cover. Anyone
remember this book? This is going to drive me nuts all
day. :)
-Ian
--
Sincerely,
John Kuenzig, Bookseller
Kuenzig Books
PO Box 452, Topsfield, MA 01983
978-887-4053 9am-7pm Eastern Standard Time
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9:30 a.m.
On Thu, 10 Apr 2008, Mr Ian Primus wrote:
--- David Griffith <dgriffi at cs.csubak.edu>
wrote:
No. I meant fresh floppies.
I've just brought up a Mac SE/30 with fresh
disks
and noticed that the
monitor occasionally gets wavy or shudders. How
should I proceed in
fixing this?
When you say fresh disks, did you mount two internal
hard disks inside the SE/30? You're probably going to need to replace a couple
of
capacitors on the analog board. There's one particular
capacitor that comes to mind as causing a different
problem, it's nonpolar, so watch out. Is it like a
60hz kind of a wave in the picture, or is it more
random? A wave through the screen, like a waving flag?
It happens perhaps once every ten seconds. The disturbance is something
like a ripple or wave that crawls up the side of the screen.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
10:10 a.m.
On Apr 10, 2008, at 12:30 PM, David Griffith wrote:
On Thu, 10 Apr 2008, Mr Ian Primus wrote:
Does the system still have the original shielding in it on the
motherboard and analog board?
Rob Borsuk
email: rborsuk at colourfull.com
Colourfull Creations
Web: http://www.colourfull.com
--- David Griffith <dgriffi at
cs.csubak.edu> wrote:
It happens perhaps once every ten seconds. The disturbance is
something
like a ripple or wave that crawls up the side of the screen.
--
David Griffith
dgriffi at cs.csubak.edu
2:42 p.m.
On Thu, 10 Apr 2008, Robert Borsuk wrote:
I haven't opened it up yet.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
It happens
perhaps once every ten seconds. The disturbance is
something like a ripple or wave that crawls up the side of the screen.
Does the system still have the original shielding in it on the
motherboard and analog board?
11 Apr
11 Apr
6:57 a.m.
--- David Griffith <dgriffi at cs.csubak.edu> wrote:
I haven't opened it up yet.
In case you've never dismantled one of these Macs, you
need a really long Torx T-15 screwdriver to remove the
two screws in the handle area. If you don't have one,
here's how you can make one:
Take a Bic stic pen, the kind with the white round
barrel, and pull out the pen part and the cap on the
other end, leaving only a hollow tube.
Jam a 1/4" drive T-15 driver bit into one end of the
pen. It will wedge in nicely.
Partially sharpen a new, hexagonal wooden pencil
(think the yellow kind), and ram it into the other end
of the pen barrel. It will also wedge in nicely.
You now have a Mac opener tool that can remove and
reinstall those two Torx screws in the handle. As
stupid as this tool looks, it is strong enough to do
this, and last for many Macs. Once you get all the
screws out (there are five, three you can get with a
normal Torx driver, and two you need the long tool
for), lay the mac face down on a soft towel and use
the heel of your hand to bang on the case around the
seam. Once the case starts to loosen, you can grab the
case and push down on the motherboard ports with your
thumbs, and the case should slide off.
On early Macs (128k, 512k, Plus), there is one screw
behind the battery door. Don't forget it. Also, don't
push on the battery compartment to assist in removing
the case. It's not going to be strong enough, and the
holder could break.
-Ian
10 Apr
10 Apr
10:19 a.m.
On Thu, Apr 10, 2008 at 9:30 AM, David Griffith <dgriffi at cs.csubak.edu> wrote:
It happens perhaps once every ten seconds. The
disturbance is something
like a ripple or wave that crawls up the side of the screen.
Ugh. I've seen that on X and Plan 9. A couple suggestions:
-Make sure the signal cable isn't going near a big power supply or
line. Actually, isolate the monitor as much as you can by getting it
away from the wall, away from the case, away from your speakers.
-Try setting the display to a lower refresh rate, if you can--I had a
very similar problem in X until I dropped the refresh to 60Hz.
Hope this helps
John
--
Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn
9:55 p.m.
From: dgriffi at cs.csubak.edu
---snip---
It happens perhaps once every ten seconds. The disturbance is something
like a ripple or wave that crawls up the side of the screen.
Hi
It sounds like a bad primary filter capacitor. I assume it is a switcher.
If so, there are high voltage capacitors on the primary side.
If it is a linear, it would be low voltage on the secondary.
Try adding additional capacitance in parallel with the one that is there.
If it gets better you'll know what to do.
Dwight
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dgriffi＠cs.csubak.edu -
dkelvey＠hotmail.com -
ian_primus＠yahoo.com -
jfk＠kuenzigbooks.com -
rborsuk＠colourfull.com -
slawmaster＠gmail.com