Mac Classic - will it ever run again!!

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rubber_jonnie
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Re: Mac Classic - will it ever run again!!

Post by rubber_jonnie » Mon Jan 04, 2021 10:30 pm

mrbombermillzy wrote:
Mon Jan 04, 2021 8:38 pm
Theres a book, The Dead Mac Scrolls, which covers troubleshooting and repairs for the early 68k Macs.

It may well help out. :)
My I just found these, they are excellent, thank you!
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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mrbombermillzy
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Re: Mac Classic - will it ever run again!!

Post by mrbombermillzy » Mon Jan 04, 2021 10:36 pm

No probs.

:cheers:

I hope it helps!

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Re: Mac Classic - will it ever run again!!

Post by rubber_jonnie » Mon Jan 04, 2021 11:10 pm

mrbombermillzy wrote:
Mon Jan 04, 2021 10:36 pm
No probs.

:cheers:

I hope it helps!
Me too, I'm determined to make it bloody work again, as I blame myself for it dying, should have done the caps sooner. Similar problems with my Amstrad ALT-386, capacitor related, and that took some fixing, that goo is bad juju.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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mrbombermillzy
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Re: Mac Classic - will it ever run again!!

Post by mrbombermillzy » Tue Jan 05, 2021 12:41 am

rubber_jonnie wrote:
Mon Jan 04, 2021 11:10 pm

Me too, I'm determined to make it bloody work again, as I blame myself for it dying, should have done the caps sooner. Similar problems with my Amstrad ALT-386, capacitor related, and that took some fixing, that goo is bad juju.
Havent had too much trouble with old caps so far.

Im more of a 'battery leaked and ruined the mainboard' kind of guy.

Got an old Archimedes A5000 and a 486 mobo that have succumbed to the dreaded ooze. That stuff creeps UP legs! Its relentless.

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Re: Mac Classic - will it ever run again!!

Post by rubber_jonnie » Tue Jan 05, 2021 8:57 am

mrbombermillzy wrote:
Tue Jan 05, 2021 12:41 am
rubber_jonnie wrote:
Mon Jan 04, 2021 11:10 pm

Me too, I'm determined to make it bloody work again, as I blame myself for it dying, should have done the caps sooner. Similar problems with my Amstrad ALT-386, capacitor related, and that took some fixing, that goo is bad juju.
Havent had too much trouble with old caps so far.

Im more of a 'battery leaked and ruined the mainboard' kind of guy.

Got an old Archimedes A5000 and a 486 mobo that have succumbed to the dreaded ooze. That stuff creeps UP legs! Its relentless.
I recapped my A1200 recently, that was a close call, caps were starting to ooze. The Macs seem to be the worst for battery explosions, I heard it called 'Maxell Bomb' by somebody. The worst damage was the Amstrad though, a single cap caused hours of repairs and bodge wiring to revive it. It's those little aluminium SMD dustbins that seem to be the worst for some reason. I replace with tantalum bricks where possible, no future danger of leakage!!
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

stephen_usher
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Re: Mac Classic - will it ever run again!!

Post by stephen_usher » Tue Jan 05, 2021 10:32 am

rubber_jonnie wrote:
Tue Jan 05, 2021 8:57 am
[I recapped my A1200 recently, that was a close call, caps were starting to ooze. The Macs seem to be the worst for battery explosions, I heard it called 'Maxell Bomb' by somebody. The worst damage was the Amstrad though, a single cap caused hours of repairs and bodge wiring to revive it. It's those little aluminium SMD dustbins that seem to be the worst for some reason. I replace with tantalum bricks where possible, no future danger of leakage!!
Indeed... only *FIRE* from tantalums. ;-)

Actually, polythene caps are probably the least dangerous long term now.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

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Re: Mac Classic - will it ever run again!!

Post by rubber_jonnie » Tue Jan 05, 2021 12:47 pm

stephen_usher wrote:
Tue Jan 05, 2021 10:32 am
rubber_jonnie wrote:
Tue Jan 05, 2021 8:57 am
[I recapped my A1200 recently, that was a close call, caps were starting to ooze. The Macs seem to be the worst for battery explosions, I heard it called 'Maxell Bomb' by somebody. The worst damage was the Amstrad though, a single cap caused hours of repairs and bodge wiring to revive it. It's those little aluminium SMD dustbins that seem to be the worst for some reason. I replace with tantalum bricks where possible, no future danger of leakage!!
Indeed... only *FIRE* from tantalums. ;-)

Actually, polythene caps are probably the least dangerous long term now.
Not had one catch fire yet ;)
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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Re: Mac Classic - will it ever run again!!

Post by rubber_jonnie » Wed Jan 06, 2021 12:03 am

Hmm, Dead Mac Scrolls is an interesting read, and it seems nearly all of the problems with early Macs that I've looked at so far (I'm only up to page 59 of 489) are analog board related.

And I've found a problem description that seems to match mine. The fix is supposedly replacing the 74LS38N on the Analog Board, so I figure what's to lose?

Parts are on order, we'll see what's what.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

Tomswork
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Re: Mac Classic - will it ever run again!!

Post by Tomswork » Wed Jan 06, 2021 12:51 am

The analog boards are a pain even the yoke connector melts


Tom

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Re: Mac Classic - will it ever run again!!

Post by rubber_jonnie » Wed Jan 06, 2021 8:58 am

Tomswork wrote:
Wed Jan 06, 2021 12:51 am
The analog boards are a pain even the yoke connector melts


Tom
The yoke connector melts!!!

That's mad!

:fire: :fire: :fire: :fire: :fire:
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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