Jump to content


Photo

Mac Plus: Restoration


  • Please log in to reply
23 replies to this topic

#1 LC_575

LC_575
  • 6502

Posted 05 June 2011 - 03:42 PM

Thanks to some tools borrowed from my friend, I finally managed to get the case open on my Plus (never again will I ever screw in those handle screws!).

Like any 25 year old computer, the Plus has suffered some damage. The case body has some substantial rust stains that my friend described as acid stains - they're white deposits. They're mainly concentrated on the case body (specifically around the logic board tray) and have damaged the power board (around the mains power connector) somewhat.

On the brighter side, the logic board appears to have been completely spared from any sort of rust damage, or even cap damage. The power board, outside of that one damaged area, looks fine too; even the caps aren't bulging.

Anyways, when I turn it on I get a distorted bong and then a black screen covered in white rasters and a Sad Mac in the dead center - screen is too garbled to get an error code.

What do I do next?
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.

#2 LC_575

LC_575
  • 6502

Posted 05 June 2011 - 07:44 PM

Okay, I successfully disassembled the plus. I believe I discharged it properly, touching the anode clips and aperture to the ground lug (via screwdriver + alligator clip wire), but I didn't hear the charcteristic "pop" sound. Just to be sure, I also discharged the clips and aperture separately afterwards.

Anyways, here are some pics of the Plus:

Logic Board:
Posted Image

Power/Sweep Board:
Posted Image
Posted Image
Posted Image
Posted Image

What's next?
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.

#3 techknight

techknight
  • 68LC040

Posted 05 June 2011 - 09:21 PM

dont see anything.
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#4 LC_575

LC_575
  • 6502

Posted 05 June 2011 - 09:23 PM

Did you miss the large corrosion stain on the power board in the last three pics?
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.

#5 techknight

techknight
  • 68LC040

Posted 05 June 2011 - 09:25 PM

what pics. there are no pics.
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#6 Concorde1993

Concorde1993
  • 68000
  • LocationBrampton, Ontario, Canada

Posted 05 June 2011 - 10:20 PM

what pics. there are no pics.

Same here, LC_575. Try uploading them again.

Some Macs, some Amigas & a Concorde.

"If you can find a better car, buy it." - Lee Iacocca. 


#7 Apostrophe

Apostrophe
  • 6502
  • LocationOhio

Posted 05 June 2011 - 10:22 PM

Check the thread I started myself on displaying pics in posts:

viewtopic.php?f=1&t=11095&start=0&hilit=

-Apostrophe
Compacts: Macintosh SE, Macintosh SE, Macintosh 512k, Macintosh Plus

Other Macintoshes/Apples: Macintosh Centris 610, Macintosh Quadra 660av, iMac G3 Indigo, Apple IIc

Non-Macintosh: Soyo PC, HP laptop, Atari 800XL, Commodore Vic 20

#8 LC_575

LC_575
  • 6502

Posted 05 June 2011 - 11:14 PM

This is very odd....

I'll try reuploading them.
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.

#9 LC_575

LC_575
  • 6502

Posted 06 June 2011 - 12:20 AM

OK, here they are:

Logic Board:
Posted Image

Power/Sweep Board:
Posted Image
Posted Image
Posted Image
Posted Image
Posted Image
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.

#10 Mac128

Mac128
  • 68020

Posted 06 June 2011 - 06:03 AM

I'm not really seeing any obvious problems here. If you're talking about the corrosion on the bottom lower corner of the PSU, then that's a non-starter. Strictly a grounding point. Should not affect operation in the manner you describe.

You are best to go through Dr. Tom Lee's excellent tutorial for testing, checking, and repairing to see if any of the usual problems crop up first.

#11 LC_575

LC_575
  • 6502

Posted 06 June 2011 - 09:16 PM

And where will I find that?
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.

#12 LC_575

LC_575
  • 6502

Posted 07 June 2011 - 05:24 PM

Can any Plus experts help me out with this?
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.

#13 Mac128

Mac128
  • 68020

Posted 07 June 2011 - 06:59 PM

Patience young Jedi.

I am still surprised why this link is some kind of treasured Eater Egg in this site. Other than having been posted literally dozens of times in related threads (which I assume you did not search), I know of no way to find this otherwise.

http://68kmla.org/files/

I am further surprised nobody else beat me to it. Very telling indeed.

#14 LC_575

LC_575
  • 6502

Posted 07 June 2011 - 11:04 PM

Sorry 'bout that. My first instinct is to do a Google search, which was fruitless.

Anyways, I'll take a look and get started. Watch here for updates.
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.

#15 gubbish

gubbish
  • 6502
  • LocationSan Francisco, CA

Posted 08 June 2011 - 05:57 AM

I had a very similar symptom in a Mac Plus. Distorted bong, video strangeness, sad mac with strange pixels. It turned out that it was bad RAM - two of the SIMMs in that Mac turned out to be bad. Replaced them and it worked fine. Might not be the same problem with yours, but it's easy to test at least.

#16 Trash80toHP_Mini

Trash80toHP_Mini

    NIGHT STALKER

  • 68040
  • LocationBermuda Triangle, NC, USA

Posted 08 June 2011 - 01:44 PM

I am still surprised why this link is some kind of treasured Eater Egg in this site.


Me too, but I don't hang out here in the Compacts Forum very much! :-/

That'd be a great one to add to the Peripherals: LINKS Project: Rev. 3.0 along with any others you might know about!

p.s. It never was just about peripherals, I was assigned as the new mod of that particular forum when "the kids" promoted me back in the day.

p.p.s. Hey, maniac, where are you?!?!?!
jt [8]
Trash Hauler: call sign: eight-ball

C.O. AC130H SpecOps 68kMLAAF

#17 mcdermd

mcdermd
  • 68020
  • LocationCorvallis, Oregon

Posted 08 June 2011 - 04:21 PM

Distorted bong, video strangeness, sad mac with strange pixels. It turned out that it was bad RAM - two of the SIMMs in that Mac turned out to be bad.


I had the same in a 128k. It was a bad RAM chip too. I soldered a new one in and it was fine again.
Classic: Too many to list. See http://www.applefool.com for details.
Modern: 21.5" iMac 3.06GHz Core i3, 24" iMac 3.06GHz C2D, 13" MacBook 2.1GHz C2D, XServe Dual 2.0GHz G5

#18 LC_575

LC_575
  • 6502

Posted 08 June 2011 - 11:23 PM

One technical question: Once disconnected, is the Anode wire and it's flyback transformer still dangerous to touch? Should I discharge it again (power/sweep board has been sitting for a few days now)?
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.

#19 Dog Cow

Dog Cow
  • 68000

Posted 09 June 2011 - 12:52 AM

One technical question: Once disconnected, is the Anode wire and it's flyback transformer still dangerous to touch? Should I discharge it again (power/sweep board has been sitting for a few days now)?

Sure, and I even discovered a fun/novel way to discharge it while working on a small b&w set the other day:

take a small, damp rag/washcloth, held in one hand, and dangle it around the anode wire where it enters the tube (on this CRT, it was bare; didn't have a rubber thingy covering it). It will make a nice spark, and you'll feel your heart beat faster for a bit. Fun.
Mac GUI Vault - A source for retro Apple II and Macintosh computing.
Email me: dog_cow@macgui.com

#20 LC_575

LC_575
  • 6502

Posted 09 June 2011 - 01:14 AM

Getting an adrenaline high from discharging a 20 year old 9" CRT.

xx(


In related news, I have completely repaired the Plus. It turns on and has successfully booted several times from a SCSI hard drive. :approve:
Lost all the Macs to Hurricane Sandy.

The '90's didn't end with New Year's 2000. They ended with the release of 9.2.2.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users