31 Oct
2012
31 Oct
'12
10:24 p.m.
I have a well-treated Macintosh SE/30 that I'd like to fix up.
Problem 1) Whenever the CPU is doing something or something is being read
or written, faint warbling screeches can be heard coming from inside. The
volume control does nothing to quell this noise.
Problem 2) The image on the monitor is canted a few degrees clockwise --
enough to be noticable and irritating.
Problem 3) I've figured out how to format a Mac floppy under Linux and
transfer files by floppy, but I'm unclear how I should get two needed
utilities: binhex and unstuff onto a Mac floppy without mangling the
resource and data forks.
Please help.
--
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?
31 Oct
31 Oct
11:30 p.m.
On 11/01/2012 01:24 AM, David Griffith wrote:
I have a well-treated Macintosh SE/30 that I'd
like to fix up.
Problem 1) Whenever the CPU is doing something or something is being
read or written, faint warbling screeches can be heard coming from
inside. The volume control does nothing to quell this noise.
This is likely subharmonic trace resonances in the CPU board. I don't
think you'll be able to do much about that.
Problem 2) The image on the monitor is canted a few
degrees clockwise --
enough to be noticable and irritating.
Power it off. Pop it open, slightly loosen the clamp on the CRT's
yoke, and turn it a bit to correct. BE VERY CAREFUL, and DO NOT DO THIS
WITH THE POWER ON. There's serious high voltage in that area.
Problem 3) I've figured out how to format a Mac
floppy under Linux and
transfer files by floppy, but I'm unclear how I should get two needed
utilities: binhex and unstuff onto a Mac floppy without mangling the
resource and data forks.
This is a guess, but I believe there's a Linux implementation of
StuffIt which might help with this. (I know it was ported to UNIX; I
have the Solaris/SPARC version)
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
11:33 p.m.
On 10/31/2012 10:24 PM, David Griffith wrote:
I have a well-treated Macintosh SE/30 that I'd like to fix up.
Problem 1) Whenever the CPU is doing something or something is being
read or written, faint warbling screeches can be heard coming from
inside. The volume control does nothing to quell this noise.
Problem 2) The image on the monitor is canted a few degrees clockwise --
enough to be noticable and irritating.
Problem 3) I've figured out how to format a Mac floppy under Linux and
transfer files by floppy, but I'm unclear how I should get two needed
utilities: binhex and unstuff onto a Mac floppy without mangling the
resource and data forks.
Please help.
Problem 1 /could/ be inductors or capacitors in the switching power
supply.
Problem 2 is easy. The deflection coils/yoke on the neck of the CRT
has been rotated. This is common if roughly handled. Loosen the
fastener and rotate the yoke a few degrees counter-clockwise...
Re-tighten the fastener.
Normal warnings about electrocuting yourself apply. Make sure the
monitor is unplugged and to discharge the high voltage.
Bob.
11:48 p.m.
On 01/11/2012, at 3:24 PM, David Griffith <dgriffi at cs.csubak.edu> wrote:
I have a well-treated Macintosh SE/30 that I'd
like to fix up.
Problem 1) Whenever the CPU is doing something or something is being read or written,
faint warbling screeches can be heard coming from inside. The volume control does nothing
to quell this noise.
Just a guess, but the last few SE30's I've come across have all had at least a few
dried out capacitors causing problems.. This could be the reason for problem 1.
Cheers,
Chris
11:56 p.m.
On Thu, 1 Nov 2012, Chris Pye wrote:
On 01/11/2012, at 3:24 PM, David Griffith <dgriffi at cs.csubak.edu> wrote:
When I played with this Mac last year, the noise problem wasn't present.
Now that it has been running for a couple hours, the screeching is gone.
I suppose a recapping of the power supply and monitor would be a good idea
anyhow.
--
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?
I have a well-treated Macintosh SE/30 that
I'd like to fix up.
Problem 1) Whenever the CPU is doing something or something is being
read or written, faint warbling screeches can be heard coming from
inside. The volume control does nothing to quell this noise.
Just a guess, but the last few SE30's I've come across have all had at
least a few dried out capacitors causing problems.. This could be the
reason for problem 1.
1 Nov
1 Nov
12:11 a.m.
On 01/11/2012, at 4:56 PM, David Griffith <dgriffi at cs.csubak.edu> wrote:
When I played with this Mac last year, the noise
problem wasn't present. Now that it has been running for a couple hours, the
screeching is gone. I suppose a recapping of the power supply and monitor would be a good
idea anyhow.
I would be inclined to check for ripple on the power supply lines first, if it's ok
then the problem could be on the logic board.
Chris
12:26 a.m.
On Thu, 1 Nov 2012, Chris Pye wrote:
On 01/11/2012, at 4:56 PM, David Griffith <dgriffi at cs.csubak.edu> wrote:
I'll have to wait until I can get an oscilloscope to do that bit of
surgery. One last thing before I turn in... does anyone remember how to
associate a file type with a particular application in MacOS 6? My goal
is to get it so I can click on a text file and have BBedit open it up for
me.
Tomorrow I'll see about getting this machine to talk to a Linux server
running Netatalk.
--
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?
When I played with this Mac last year, the noise
problem wasn't
present. Now that it has been running for a couple hours, the
screeching is gone. I suppose a recapping of the power supply and
monitor would be a good idea anyhow.
I would be inclined to check for ripple on the power supply lines first,
if it's ok then the problem could be on the logic board.
12:34 a.m.
On 11/01/2012 03:26 AM, David Griffith wrote:
One last thing before I turn in... does anyone
remember how to
associate a file type with a particular application in MacOS 6? My goal
is to get it so I can click on a text file and have BBedit open it up
for me.
Isn't in the "Get Info" dialog box, the file type and creator,
specified as four characters?
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
4:52 a.m.
On Nov 1, 2012, at 3:34, Dave McGuire <mcguire at neurotica.com> wrote:
On 11/01/2012 03:26 AM, David Griffith wrote:
Not the regular "get info" box, but there was an excellent
third-party utility called "Get More Info" which would let
you see and edit file attributes like type/creator and
various flags. I highly recommend it.
What I think Dave is talking about is changing the
association of text files so they're not opened with
TeachText/SimpleText by default. I don't remember
exactly how that's done, but there's a third-party utility
for that as well; I need to boot up my old 7300 which
was my personal machine in the '90s, because it has a
lot of these guys installed.
- Dave
One last thing before I turn in... does anyone
remember how to
associate a file type with a particular application in MacOS 6? My goal
is to get it so I can click on a text file and have BBedit open it up
for me.
Isn't in the "Get Info" dialog box, the file type and creator, specified
as four characters? 
6:20 a.m.
On Thu, Nov 1, 2012 at 7:52 AM, David Riley <fraveydank at gmail.com> wrote:
On Nov 1, 2012, at 3:34, Dave McGuire <mcguire at
neurotica.com> wrote:
What I think Dave is talking about is changing the
association of text files so they're not opened with
TeachText/SimpleText by default. I don't remember
exactly how that's done, but there's a third-party utility
for that as well; I need to boot up my old 7300 which
was my personal machine in the '90s, because it has a
lot of these guys installed.
One of the later versions of MacOS (8 or 9) introduced a control panel like
the file type association screen in Windows, that let you explicitly set
what program opens what type of file, along with MIME types.
There's also Internet Config, which sets MIME type associations, but I
think it might do default handlers as well.
Classic MacOS had two pieces of metadata for every file - the file type and
file creator. File type does what it sounds like, whereas the file creator
tells the OS what application created it, and which one should open it. So
it would be possible to have .C and .H files created with Metrowerks open
with Metrowerks, and .C and .H files created with BBEdit open with BBEdit,
even though they are the same type of file, and you could explicitly open
them from within BBEdit or Metrowerks.
6:39 a.m.
What I think
Dave is talking about is changing the
association of text files so they're not opened with
TeachText/SimpleText by default. I don't remember
exactly how that's done, but there's a third-party utility
for that as well; I need to boot up my old 7300 which
was my personal machine in the '90s, because it has a
lot of these guys installed.
One of the later versions of MacOS (8 or 9) introduced a control panel like
the file type association screen in Windows, that let you explicitly set
what program opens what type of file, along with MIME types.
6:56 a.m.
On Nov 1, 2012, at 9:39 AM, Cameron Kaiser wrote:
ResEdit will let you change type/creator codes very
easily and is an
essential tool for classic Macs.
Well, yes. If you don't have ResEdit, you should. But the
Get More Info utility is a lot handier for doing quick changes
on the fly (it shortcuts to Cmd-Opt-I).
- Dave
6:42 a.m.
What I think Dave is talking about is changing the
association of text files so they're not opened with
TeachText/SimpleText by default. I don't remember
exactly how that's done, but there's a third-party utility
for that as well; I need to boot up my old 7300 which
was my personal machine in the '90s, because it has a
lot of these guys installed.
You just change the creator code. For example, R*ch would open it in
BBEdit (Rich Siegel's little easter egg).
--
------------------------------------ personal: http://www.cameronkaiser.com/ --
Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com
-- If I wanted your opinion, I'd have beaten it out of you. -------------------
6:55 a.m.
On Nov 1, 2012, at 9:42 AM, Cameron Kaiser wrote:
Oh, sure. That works. There is *also* a utility out there
somewhere to change the type/creator association for double-
clicks (for example, I found out by accident that AIM had
claimed all files with creator code "oscr" and had to steal
it back because I had used that for all mine as well).
It's a hell of a lot more convenient to make BBEdit claim
all text files with a particular creator code than it is
to change all text files to creator code "R*ch".
- Dave
What I think
Dave is talking about is changing the
association of text files so they're not opened with
TeachText/SimpleText by default. I don't remember
exactly how that's done, but there's a third-party utility
for that as well; I need to boot up my old 7300 which
was my personal machine in the '90s, because it has a
lot of these guys installed.
You just change the creator code. For example, R*ch would open it in
BBEdit (Rich Siegel's little easter egg).
7:55 a.m.
You just
change the creator code. For example, R*ch would open it in
BBEdit (Rich Siegel's little easter egg).
Oh, sure. That works. There is *also* a utility out there
somewhere to change the type/creator association for double-
clicks (for example, I found out by accident that AIM had
claimed all files with creator code "oscr" and had to steal
it back because I had used that for all mine as well).
8:06 a.m.
On Nov 1, 2012, at 10:55 AM, Cameron Kaiser wrote:
I assume that modifies the Desktop file?
That is my recollection; I recall using it along with a utility
called "Save a BNDL" which updates the desktop database when
you've changed things like file icons in an application's resource
and the Finder hasn't "caught up" to the change from the main app.
There's a lot of interesting info on the Desktop file and its
contents here by the fellow who maintained Save a BNDL and several
other Desktop file utils:
http://www.tempel.org/macdev/index.html
It's rather instructive on the file->application lookup process,
among other things.
- Dave
You just change the creator code. For example, R*ch
would open it in
BBEdit (Rich Siegel's little easter egg).
Oh, sure. That works. There is *also* a utility out there
somewhere to change the type/creator association for double-
clicks (for example, I found out by accident that AIM had
claimed all files with creator code "oscr" and had to steal
it back because I had used that for all mine as well). 
7:26 a.m.
On 1 Nov 2012, at 12:52 , David Riley <fraveydank at gmail.com> wrote:
On Nov 1, 2012, at 3:34, Dave McGuire <mcguire at
neurotica.com> wrote:
I believe that was set in PC Exchange.
.tsooJ
--
Do you really think that when Jesus comes back he'll want to see a cross?
--
Joost van de Griek
<http://www.jvdg.net/>
On 11/01/2012 03:26 AM, David Griffith wrote:
What I think Dave is talking about is changing the
association of text files so they're not opened with
TeachText/SimpleText by default. I don't remember
exactly how that's done, but there's a third-party utility
for that as well; I need to boot up my old 7300 which
was my personal machine in the '90s, because it has a
lot of these guys installed. One last thing before I turn in... does anyone
remember how to
associate a file type with a particular application in MacOS 6? My goal
is to get it so I can click on a text file and have BBedit open it up
for me.
Isn't in the "Get Info" dialog box, the file type and creator, specified as
four characters?
8:43 a.m.
On Nov 1, 2012, at 10:26 AM, Joost van de Griek wrote:
On 1 Nov 2012, at 12:52 , David Riley <fraveydank
at gmail.com> wrote:
Looking it up in the reference material I just posted, it
seems that the hook for overriding creator codes was added
in Mac OS 8 or 8.1, so that's no good for System 6. I didn't
actually recall a version of BBEdit that could run under 6,
but I didn't actually start to pay attention to it until about
the PowerPC era.
So, looks like you may be a little stuck unless someone has a
better solution than changing the creator codes of all your
text files to R*ch (which does not sound fun).
- Dave
On Nov 1, 2012, at 3:34, Dave McGuire <mcguire
at neurotica.com> wrote:
I believe that was set in PC Exchange. On 11/01/2012 03:26 AM, David Griffith wrote:
What I think Dave is talking about is changing the
association of text files so they're not opened with
TeachText/SimpleText by default. I don't remember
exactly how that's done, but there's a third-party utility
for that as well; I need to boot up my old 7300 which
was my personal machine in the '90s, because it has a
lot of these guys installed. One last thing before I turn in... does anyone
remember how to
associate a file type with a particular application in MacOS 6? My goal
is to get it so I can click on a text file and have BBedit open it up
for me.
Isn't in the "Get Info" dialog box, the file type and creator, specified as
four characters? 
8:25 a.m.
Am 01.11.2012 um 08:26 schrieb David Griffith:
does anyone remember how to associate a file type with
a particular
application in MacOS 6?
Of course! Search for ResEdit or File Typer. You can change the
creator code to R*ch, which is used by BBEdit.
Tomorrow I'll see about getting this machine to
talk to a Linux
server running Netatalk.
Working great here!
:wq! PoC
12:17 a.m.
If the the sounds are like a falling bomb coming through the speakers, then
it is likely to be failing capacitors on the main board. This is a known
issue with the baby Macs.
Terry (Tez)
On Thu, Nov 1, 2012 at 7:56 PM, David Griffith <dgriffi at cs.csubak.edu>wrote:
On Thu, 1 Nov 2012, Chris Pye wrote:
On 01/11/2012, at 3:24 PM, David Griffith
<dgriffi at cs.csubak.edu> wrote:
I have a well-treated Macintosh SE/30 that I'd like to fix up.
When I played with this Mac last year, the noise problem wasn't present.
Now that it has been running for a couple hours, the screeching is gone. I
suppose a recapping of the power supply and monitor would be a good idea
anyhow.
--
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?
Problem 1) Whenever the CPU is doing something or something is being
read or written, faint warbling screeches can be heard coming from inside.
The volume control does nothing to quell this noise.
Just a guess, but the last few SE30's I've come across have all had at
least a few dried out capacitors causing problems.. This could be the
reason for problem 1.
8:22 a.m.
Am 01.11.2012 um 08:17 schrieb Terry Stewart:
If the the sounds are like a falling bomb coming
through the
speakers, then
it is likely to be failing capacitors on the main board. This is a
known
issue with the baby Macs.
I can prove this noise from a LC, also. Recapping the board,
everything's okay.
:wq! PoC
8:23 a.m.
Am 01.11.2012 um 07:56 schrieb David Griffith:
I suppose a recapping of the power supply and monitor
would be a
good idea anyhow.
The power supply is very well engineered. The only thing one should do
is check and resolder broken soldering points. I never had problems
with caps in there, with multiple machines.
:wq! PoC
8:21 a.m.
Am 01.11.2012 um 07:48 schrieb Chris Pye:
Just a guess, but the last few SE30's I've
come across have all had
at least a few dried out capacitors causing problems.. This could be
the reason for problem 1.
Yes, but one should be really really careful. In fact, the caps are
dried out, because they leak their inside onto the board. This
corrosive liquid creeps everywhere if it isn't stopped by excessive
dust on the board.
I killed two boards by cleaning with too much solvent. I suspict some
chips aren't leakproof anymore. The cleaning liquid got inside and
destroyed somehing in there.
Being really really careful, cleaning the cap fluid contamiated areas
with with a q-tip and some solvent (I use Kontakt WL) is the first
step to go. Then, re-check if the machine's still working. When it is,
change caps and the machine will hopefully do another 25 years.
These are my records about my latest repair. Sorry for the bad google
translation:
http://translate.google.de/translate?sl=de&tl=en&js=n&prev=_t&a…
If I had time and knowledge of this digital stuff, I'd start a project
for a replacement board for the SE/30 with modern components, being
fully compatible to the old one.
:wq! PoC
8:52 a.m.
On Nov 1, 2012, at 11:21 AM, Schindler Patrik wrote:
If I had time and knowledge of this digital stuff,
I'd start a project for a replacement board for the SE/30 with modern components,
being fully compatible to the old one.
That would be fun! But 68030s are still quite expensive. A
Coldfire reimagining would be a lot of fun, but unfortunately,
most modern Coldfires use the A-line instructions for the
enhanced MAC unit (multiply-accumulate, not Macintosh), so
there's no A-line trap for the toolbox instructions.
Alternatively, a small FPGA that could reliably emulate a
68030 probably actually costs less than the real thing, so
it wouldn't be impossible. You could use super-cheap SDRAM
then, as well.
- Dave
10:53 a.m.
Am 01.11.2012 um 16:52 schrieb David Riley:
Yap, that was also a thought of a friend. Most of the chips used in a
SE/30 are out of production for years now. So it's easier to emulate
these stuff in some kind of FPGA.
SDRAM would be nice, but modern chips are very huge in capacity, so it
would be hard to get less memory than 256MB. ;-)
Bedides that, since there's much available space on the board, the
FPGA could emulate a 8390 for getting Ethernet, better video cirquity
for having 256 gays on the internal screen and possibly a second
graphics logic for external monitors. Since the SE/30 features the
NuBus-Adressing scheme with only one slot available, this all could be
done in a compatible manner. I'd pay up to 300 Euros for such a board.
It's so sweet to dream...
:wq! PoC
If I had time
and knowledge of this digital stuff, I'd start a
project for a replacement board for the SE/30 with modern
components, being fully compatible to the old one.
That would be fun! But 68030s are still quite expensive.
A Coldfire reimagining would be a lot of fun, but unfortunately,
most modern Coldfires use the A-line instructions for the
enhanced MAC unit (multiply-accumulate, not Macintosh), so
there's no A-line trap for the toolbox instructions.
Alternatively, a small FPGA that could reliably emulate a
68030 probably actually costs less than the real thing, so
it wouldn't be impossible. You could use super-cheap SDRAM
then, as well.
2:42 a.m.
On 1 Nov 2012, at 6:24 , David Griffith <dgriffi at cs.csubak.edu> wrote:
Problem 3) I've figured out how to format a Mac
floppy under Linux and transfer files by floppy, but I'm unclear how I should get two
needed utilities: binhex and unstuff onto a Mac floppy without mangling the resource and
data forks.
Been here, yet: <http://www.mars.org/home/rob/proj/hfs/>?
.tsooJ
--
I propose a corollary to Godwin's Law: substitute 'Linux' for
'Hitler'.
- SkyWriter in comp.sys.sgi.misc
--
Joost van de Griek
<http://www.jvdg.net/>
4:46 a.m.
On Nov 1, 2012, at 1:24, David Griffith <dgriffi at cs.csubak.edu> wrote:
I have a well-treated Macintosh SE/30 that I'd like to fix up.
Problem 1) Whenever the CPU is doing something or something is being read or written,
faint warbling screeches can be heard coming from inside. The volume control does nothing
to quell this noise.
I've had a number of machines that did that; I guess it's just
microphonics on the bus lines. It's not harmful, though I
guess it could be annoying. I always thought of it as a
crude CPU activity meter. :-)
Problem 2) The image on the monitor is canted a few
degrees clockwise -- enough to be noticable and irritating.
There's probably a monitor yoke adjustment for that,
but I'll leave that to the more skilled folks. I can look
in my copy of the Dead Mac Scrolls (which only
covers up to the SE, but should be close enough).
Problem 3) I've figured out how to format a Mac
floppy under Linux and transfer files by floppy, but I'm unclear how I should get two
needed utilities: binhex and unstuff onto a Mac floppy without mangling the resource and
data forks.
I might be able to cook up a floppy image you can
just dd onto the disk (no worrying about resource forks
then). I'll try to do that today; StuffIt Expander should
really be all you need, since it handles most common Mac
file interchange formats (.sit, .bin, .hqx and even .zip, which
was never common on the Mac until OS X).
After that, if you find an Ethernet card for it (they don't go
for all that much on eBay), you can run a 2.x version of
Netatalk on your Linux box to act as a file server (they
dropped AppleTalk support with 3.0, and most systems
you're likely to run on the SE/30 don't do AFP over TCP.
- Dave
5:11 a.m.
On #3, I used HFEexplorer on a PC and copied files directly to a 1.44mb floppy disk (I
think the SE/30 has a 1.44mb drive).
Rich Cini
Sent from my iPhone
On Nov 1, 2012, at 7:46 AM, David Riley <fraveydank at gmail.com> wrote:
On Nov 1, 2012, at 1:24, David Griffith <dgriffi at
cs.csubak.edu> wrote:
I have a well-treated Macintosh SE/30 that I'd like to fix up.
Problem 1) Whenever the CPU is doing something or something is being read or written,
faint warbling screeches can be heard coming from inside. The volume control does nothing
to quell this noise.
I've had a number of machines that did that; I guess it's just
microphonics on the bus lines. It's not harmful, though I
guess it could be annoying. I always thought of it as a
crude CPU activity meter. :-)
Problem 2) The image on the monitor is canted a
few degrees clockwise -- enough to be noticable and irritating.
There's probably a monitor yoke adjustment for that,
but I'll leave that to the more skilled folks. I can look
in my copy of the Dead Mac Scrolls (which only
covers up to the SE, but should be close enough).
Problem 3) I've figured out how to format a
Mac floppy under Linux and transfer files by floppy, but I'm unclear how I should get
two needed utilities: binhex and unstuff onto a Mac floppy without mangling the resource
and data forks.
I might be able to cook up a floppy image you can
just dd onto the disk (no worrying about resource forks
then). I'll try to do that today; StuffIt Expander should
really be all you need, since it handles most common Mac
file interchange formats (.sit, .bin, .hqx and even .zip, which
was never common on the Mac until OS X).
After that, if you find an Ethernet card for it (they don't go
for all that much on eBay), you can run a 2.x version of
Netatalk on your Linux box to act as a file server (they
dropped AppleTalk support with 3.0, and most systems
you're likely to run on the SE/30 don't do AFP over TCP.
- Dave 
5:19 a.m.
On Thu, 1 Nov 2012, David Riley wrote:
On Nov 1, 2012, at 1:24, David Griffith <dgriffi at
cs.csubak.edu> wrote:
Almost certainly dried-up bypass caps in the analog circuitry. Plan on
honing up your SMD rework skills and replace all of them.
See:
http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html
for some valuable troubleshooting tips.
Unless you're a real wizard with a hot-air pencil, there are at least a
few that are easier to replace using radial-lead packages with the leads
bent out 90-degrees. In retrospect, I probably should have done all of
them that way the last I went through this exercise.
Steve
--
I have a well-treated Macintosh SE/30 that I'd like to fix up.
Problem 1) Whenever the CPU is doing something or something is being
read or written, faint warbling screeches can be heard coming from
inside. The volume control does nothing to quell this noise.
I've had a number of machines that did that; I guess it's just
microphonics on the bus lines. It's not harmful, though I
guess it could be annoying. I always thought of it as a
crude CPU activity meter. :-) 
1:41 p.m.
I have a well-treated Macintosh SE/30 that I'd like to fix up.
Problem 1) Whenever the CPU is doing something or something is being read
or written, faint warbling screeches can be heard coming from inside. The
volume control does nothing to quell this noise.
Are you sure it's coming form the speaker? Desoldering the speaker, or
one connection to it, will quickly determine if that;'s the case.
Most of the time, such noises come from the PSU chopper transoformer, and
can be silenced by replkacing the high ESR cpaactiros in the PSU.
Problem 2) The image on the monitor is canted a few degrees clockwise --
enough to be noticable and irritating.
You need to rotat the defleciton yoke. Open th case amd then slacken the
clamp on the yoke. Often the yoke sticks in place, you do not want to
force it becasue you cna break the CRT. If it won't move, then take the
clamp right off and open the slots the clamp fitted over with a
screwdrier. That normally frees the yoke,. Refit the clamp, but loosly.
If you don't mind workign on HV stuff, power up, opld the yoke my the
plasticc former, and rotatie it to gt the pictutre straight. wathcout,
there are hgih voltag spikes on the horixotnal deflection winding.
If you are more cautious, work out roughtly waht angle to turn it by, and
do so, power up, and see if it's right.
When you have it in the right postion, retighten the clamp. Do not
overtighten it, particualrly in warm weather 9the clamp wil lcotnract in
cold weather, making it even tighter. The old 'advice' was 'Tighten until
the CRT implodes, then back off 1/4 of a turn' :-)> If in doubt, leave it
too loose, the worst that will then happen is that the yoke will move
again and you;'ll ahev to repeat the adjustment.
-tony
4217
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4217
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