17 Oct
1998
17 Oct
'98
2:24 p.m.
Hi, group.
My 128k Mac went south on me. When I first got it a year ago, it turned on and
the screen came up and asked for a floppy. Not having a system disk that old, I
just put it in storage until I came across one.
Needless to say, next time I turned it on the floppy made funny noises and
kept spitting the disk out and no video.
Does anyone have a schematic for the little beast so I can get it cooking
again? If I have to, I can use my Mac Plus for my history presentations, but I
would rather use the original, if possible.
Thanks.
Paul Braun
NerdWare -- The History of the PC and the Nerds who brought it to you.
nerdware(a)laidbak.com
www.laidbak.com/nerdware
17 Oct
17 Oct
6:24 p.m.
Needless to say, next time I turned it on the floppy
made funny noises and
kept spitting the disk out and no video.
Forget schematics, go get a copy of
"The Dead Mac Scrolls". Much better for
this sort of thing... For various things(old toaster Macs, printers,
drives, newer Macs[this is an old book so don't expect to see any
PowerMacs, although maybe a IIci]) and gives various symptoms and possible
causes(and where to find the bad part on the board). I just check out a
copy at the library when I need it, but if I see it cheap I might grab
it... It's probably out of print by now but it can't be THAT hard to
find... Or could it?
--------------------------------------------------------------
| http://members.tripod.com/~jrollins/index.html - Computers |
| http://www.geocities.com/Area51/Lair/1681/ - Star Trek |
| orham(a)qth.net list admin KD7BCY |
| ham-mac(a)qth.net Portland, OR |
--------------------------------------------------------------
18 Oct
18 Oct
6:24 a.m.
A non-text attachment was scrubbed...
Name: not available
Type: text
Size: 1763 bytes
Desc: not available
Url :
http://www.classiccmp.org/pipermail/cctalk/attachments/19981018/d3450405/at…
19 Oct
19 Oct
4:33 p.m.
Date sent: Sun, 18 Oct 1998 19:24:46 +0100 (BST)
Send reply to: classiccmp(a)u.washington.edu
From: ard(a)p850ug1.demon.co.uk (Tony Duell)
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: 128k Mac Schematic needed
<<SNIP>>
Anyway, to get back the other original problem. Sounds
like the PSU is
tripping. The Mac+ PSU (and the 128 one is similar, I think) is horrible.
It has to have the right dummy loads on both the 5V line and the 12V line
for it to power up. IT takes the regulation sense voltage from the 12V
line. And the chopper heatsink is live (don't ask...).
But my first reaction would be to test (using an ESR meter) or replace
all the electrolytics in the PSU section (lower half of the analogue
board, below the connector that goes to the logic board), especially
those near the logic board connector.
-tony
Thanks. I'll fire up the Ungar and start swapping. I shoulda thought of that -- I
know old electrolytics can go bad, especially in less-than-ideal storage. My
guess is that they were on the edge when I got it, and that one time was
enough to weaken them to the point of failure.
Paul Braun
NerdWare -- The History of the PC and the Nerds who brought it to you.
nerdware(a)laidbak.com
www.laidbak.com/nerdware
1:08 p.m.
Date: Mon, 19 Oct 1998 23:33:51 -0500
Reply-to: classiccmp(a)u.washington.edu
From: "Paul Braun" <nerdware(a)laidbak.com>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: 128k Mac Schematic needed
Date sent: Sun, 18 Oct 1998 19:24:46 +0100
(BST)
Send reply to: classiccmp(a)u.washington.edu
From: ard(a)p850ug1.demon.co.uk (Tony Duell)
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: 128k Mac Schematic needed
<<SNIP>>
Thanks. I'll fire up the Ungar and start swapping. I shoulda thought of that -- I
know old electrolytics can go bad, especially in less-than-ideal storage. My
guess is that they were on the edge when I got it, and that one time was
enough to weaken them to the point of failure.
Why not order a PSU/flyback for Mac 128/512K and Plus rebuild/upgrade
kit from CCS? That should solve everything and a new yoke connector.
Also redo all solder joints on heavy components and all connector
pins.
Cost: Not more than $30.
Jason D.
Paul Braun
NerdWare -- The History of the PC and the Nerds who
brought it to you.
nerdware(a)laidbak.com
www.laidbak.com/nerdware
email: jpero(a)cgocable.net
Pero, Jason D.
23 Oct
23 Oct
11:48 a.m.
Date sent: Tue, 20 Oct 1998 01:08:02 +0000
Send reply to: classiccmp(a)u.washington.edu
From: jpero(a)pop.cgocable.net
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: 128k Mac Schematic needed
Why not order a PSU/flyback for Mac 128/512K and Plus
rebuild/upgrade
kit from CCS? That should solve everything and a new yoke connector.
I'm not familiar with CCS. Do you have a phone # or URL? Thanks.
Also redo all solder joints on heavy components and
all connector
pins.
Will do.
Cost: Not more than $30.
Jason D.
Paul Braun
NerdWare -- The History of the PC and the Nerds who brought it to you.
nerdware(a)laidbak.com
www.laidbak.com/nerdware
10:45 a.m.
Date sent: Tue, 20 Oct 1998 01:08:02 +0000
Send reply to: classiccmp(a)u.washington.edu
From: jpero(a)pop.cgocable.net
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: 128k Mac Schematic needed
> Why not order a PSU/flyback for Mac 128/512K and Plus rebuild/upgrade
> kit from CCS? That should solve everything and a new yoke connector.
Remeber this kit, I think don't have that certain yoke connector, ask
there to find out just in case, it's not exepenisve item.
Also redo all
solder joints on heavy components and all connector
pins.
Will do.
19 Oct
19 Oct
4:39 p.m.
Date sent: Sat, 17 Oct 1998 22:24:34 -0800
Send reply to: classiccmp(a)u.washington.edu
From: John Rollins <rexstout(a)uswest.net>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: 128k Mac Schematic needed
Forget schematics, go get a copy of "The Dead Mac
Scrolls". Much better for
this sort of thing... For various things(old toaster Macs, printers,
drives, newer Macs[this is an old book so don't expect to see any
PowerMacs, although maybe a IIci]) and gives various symptoms and possible
causes(and where to find the bad part on the board). I just check out a
copy at the library when I need it, but if I see it cheap I might grab
it... It's probably out of print by now but it can't be THAT hard to
find... Or could it?
I'll probably find it on ebay for $650.
Thanks for the tip. I'll look for a copy somewhere............
Paul Braun
NerdWare -- The History of the PC and the Nerds who brought it to you.
nerdware(a)laidbak.com
www.laidbak.com/nerdware
5:06 p.m.
Date sent: Sat, 17 Oct 1998 22:24:34 -0800
Send reply to: classiccmp(a)u.washington.edu
From: John Rollins <rexstout(a)uswest.net>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: 128k Mac Schematic needed
Try http://www.powells.com there a great bookstore, in fact a lot of the
stuff amazon.com sells comes from them. I picked a copy up from them about
a year ago. They get them in every now and then (they deal in both new and
used books).
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)ix.netcom.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.dragonfire.net/~healyzh/ |
Forget schematics, go get a copy of "The
Dead Mac Scrolls". Much better for
this sort of thing... For various things(old toaster Macs, printers,
drives, newer Macs[this is an old book so don't expect to see any
PowerMacs, although maybe a IIci]) and gives various symptoms and possible
causes(and where to find the bad part on the board). I just check out a
copy at the library when I need it, but if I see it cheap I might grab
it... It's probably out of print by now but it can't be THAT hard to
find... Or could it?
I'll probably find it on ebay for $650.
Thanks for the tip. I'll look for a copy somewhere............
9558
days inactive
9564
days old
8 comments
5 participants
participants (5)
-
ard＠p850ug1.demon.co.uk -
healyzh＠ix.netcom.com -
jpero＠pop.cgocable.net -
nerdware＠laidbak.com -
rexstout＠uswest.net