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#1 2009-02-27 5:57 pm
- sonnymoon42
- Member
- Registered: 2006-02-28
- Posts: 29
Mac Classic
I got a Mac Classic last week, for free!
Not exactly a speed demon--68000 processor running at 8 MHz, 2 megs of RAM (1 MB soldered to the motherboard, 1 MB soldered to the expansion card), 40 MB hard drive.
When I first turned it on, I got a screen with verical stripes, which (from what I read) can be caused by leaky capacitors messing up the motherboard. So I opened it up, I pulled the motherboard & expansion card out, blew out dust, replaced the PRAM battery. checked for loose connections. I put it back together, turned it on and...same thing. But after a few tries I heard the startup bong and it came to life (has System 6.0.7 installed).
But then the floppy drive acted as though there was a bad disk in the drive. I could hear it trying to "read" the disk that wasn't there. I got a dialog box saying the disk is unreadable, do I want to format or eject? Didn't matter what I did--clicked eject, clicked format, inserted a disk--it went through the same loop over and over. I zapped the PRAM, no improvement. So I shut down and disconnected the floppy drive. It worked fine when I started up again. I tried connecting a spare floppy drive I have, and had the same problem.
Could it be the floppy drive cable that's bad? Or a bad chip on the motherboard?
Some people actually recommend cleaning the motherboard in a diswasher as a cure to many Mac Classic woes. That would definitely be tried only a last resort!
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#2 2009-03-01 5:30 pm
Re: Mac Classic
I hope you have a large soldering iron and a fresh spool of solder. Some soldering flux would help, too.
Those old Classics were very prone to cracked solder joints caused by metal fatigue. The vibration from the EHT transformer propagates through the power supply and work-hardens the solder, since all the components are mounted by their leads.
Add a little fresh solder to each joint taking particular care to get any solder pad that has a heavy component onthe other side (Eg capacitors, transformers etc). You need to completely reflow the solder. Inspect the joints with a magnifying glass to make sure. The cracks are hard to see otherwise.
As for the floppy, you'll need to dismantle it and remove the pads of dust and fluff within. The fan blows out the back and the only inlet is the floppy slot once the lower slot clogs.
Last edited by warragul (2009-03-01 5:32 pm)
warragul
All the things I like are either illegal, immoral or fattening.
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#3 2009-03-01 6:50 pm
- sonnymoon42
- Member
- Registered: 2006-02-28
- Posts: 29
Re: Mac Classic
warragul,
I appreciate your input. I'm afraid I have never done any soldering--I would probably do more damage than good If I wielded a soldering iron!
Is there a particular area or part (chip, or whatever) on the Classic motherboard that controls the floppy drive? If I knew where to look, maybe I could see if there is any visible damage.
Thanks,
Sonny
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#4 2009-03-21 12:02 pm
- albertstroi23
- Member
- Registered: 2009-03-21
- Posts: 3
Re: Mac Classic
Mac Rulles! I too to myself would want, only to order will have. At us such do not sell:cry:
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