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  1. Hi all, I have a faulty PSU in my mac classic, despite my attempts it still does not work I noticed that the AC-DC is isolated from the DC-DC part in the board, so do the CRT board downward. So, I have the crazy idea that by removing the transformer and the optoisolator, at this point I could inject the current from an external PSU into the pads where the voltages is supplied to the MB. Pls look at the picture. This could give power to the CRT and the MB. The DC DC it still connected but it would not, in my opinion, create problems. The question is: wo
  2. Today I recapped a Classic I analog board and MLB. The MLB got an ultrasonic clean after recapping. Without the RAM expansion installed, it boots to a screen with thin horizontal lines, then a repeating pattern that looks a bit like columns of - — ) The fan and HD runs, but no other noises can be heard. With the RAM expansion installed, it boots to a screen with thick vertical bars, then the same repeating pattern as mentioned above. The fan and HD runs and eventually a "tick tick tick tick..." sound is heard from the speaker followed by a fast repetitive noise from the
  3. I'm in the processing of diagnosing a floppy drive on a Classic undergoing repair that fails when trying to initialize a disk. I figured it'd be good to see if the disk was any good so I pulled out my Classic II that I recapped last year: Super! Well, let's not ruin the morning, how about the other Classic that's recapped: What an enjoyable time! It's been hot here so I'm wondering if something came unseated. I haven't cracked open the cases to inspect further yet, just figured I'd jump on here and vent first.
  4. Hello all, Another restore thread (I like following these for other people, so I hope you do too) Picked up a Mac Classic (1) from craigslist for $40 (they were asking $100, but accepted my offer right away, worth it to haggle - untested, dirty, yellow: Had some interesting stickers/post it note (that must have been on there for 20 years, seems "original" and survived all this time lol) You can see too how yellow/dirty/discolored the case is here too. Inside was "ok" lots of dirt in the fan, but just a bit everywhere else.
  5. As I alluded to in my SE/30 thread, I'm also working on a Classic. I've running into an issue when plugging my FloppyEMU into the external port of the computer. When in floppy emulation mode, I am able to select a disk image but the moment the computer begins to access the image, my FloppyEMU will go into a power reset loop, it will get to the self test screen, power cycle and repeat. I've recapped the logic board and replaced the leaking caps on the analog board. Voltages have been adjusted and are holding steady with several tests. If I plug the FloppyEMU into the internal co
  6. Hello everyone, I recapped the logic board and the analog board of my Macintosh Classic but when I turn the computer I hear the chime and then I get a gray screen with a pointer I can move using the mouse. It will no go further than this gray screen. If I disconnect the hard drive I get the usual floppy with the question mark. I tested the hard drive power cable with a voltmeter and I got a strong 12V and 5V respectively. I guess the hard drive may work but has the boot files corrupted. Something that caught my attention and I don’t know if it is part of the problem is that ther
  7. Hello from Lisbon Although this is my first post, I’ve been visiting this forum looking for clues on what might be wrong with a 1991 Macintosh Classic. I’ll try to clearly describe what happened so that owners with similar symptoms will be able to repair their Classics. I have no experience in electronics so please be patient and use a descriptive language for troubleshooting. I bought it knowing it didn’t work. The early symptoms were: No screen No disc activity No bong or any noise whatsoever Power cable was working I proceeded to remove the rear cover and notice
  8. Hello Can i try putting a hard drive from a powerbook 145b to a duo 210?
  9. Hi everyone. I have a Macintosh classic. The battery is leaked and corroded a part of the mainboard and I'm trying to repaire it. There is three bad resistors on the under side (R88,89,90). I need to replace them, but I don't know the value of R88 and R89.I think they are both 104 ohm like R90. Can someone help to me please, what are the correct values?
  10. Recently imported a couple of CC ii, they both worked initially. The second one I acquired started right up, but had a "sparking" sound every time it was booted, and every time it shut down (CRT off). I noticed the fan was not working, and the back casing was not flush against the front casing. I took the back off and fitted it flush with the front, screwed it back down. Fan worked, and initially, there was that "sparking sound" but no video. Took it apart again, and this time I noticed that the grounding harness was loose, and detached from the left side bracket
  11. I have a Mac Classic that suffered some battery leakage, damaged capacitors and the Y1 oscillator broken. I have cleaned up the board a bit and replaced the capacitors and am replacing the oscillator tomorrow. Should this fix the board (its currently showing a chequerboard screen when turned on)?
  12. I'm repairing a classic. I've so far washed and replaced all capacitors on the logic board, and replaced a few on the analog board. The machine almost works fine except cold starts usually have horizontal lines on screen for the first minute or so. I assume this is due to the capacitors I've yet to replace. However, now when I do a cold start, there's a small chance that I hear a very loud pop. I thought it must be a capacitor exploding so I switched it off immediately and later took it apart to inspect the boards. I found no blown capacitors on either analog or logic board. I plugged the
  13. Hello! I recently purchased a broken Color Classic off of eBay and it arrived in the mail a few days ago. The capacitors on the logic board are leaky and I ran the board through the dishwasher to get all of the goo off. After doing this, I managed to get the computer to work and I plan to recap the logic board in the next few weeks. However, the sound suddenly stopped working when I booted it up today and at first I thought that the volume was just turned down. After turning it up, there was still no boot chime or any audio of any sort. Then I realized that the Color Classic was pr
  14. I got 2 Macintosh classic's (with some other stuff) not so long ago, and when I booted up the Mac classics, they both had this line (see picture, although one of them was a little dimmer. Also one in the pic has had varying results). One of them crapped out while I was trying to fix it and smelt like burn, but the other one still shows a line. I haven't really been able to find anyone else with this problem, so how do I fix this?
  15. Hello 68kMLA! This is my first time posting in any kind of forum (unless you count Reddit), so please let me know if I'm doing anything wrong. I recently bought a Macintosh Classic for about $60 on eBay, and wanted to try and get it up and running. This is also one of my first times trying anything out like this, the only other experience I have is buying an IBM Model M No.1391401 and restoring it to working condition. I took out the motherboard hoping that only the capacitors were causing the problem, after reading that it's one of the most common problems, but I was m
  16. Hi all I'm new to the forum but not, of course, new to loving classic Macs. I've bought a Mac Classic that has been sitting in a cupboard for many years unused. However, it doesn't boot. I'm attaching a picture of the boot screen. The logic board seems to be in good condition (I've replaced the PRAM battery and washed the board with isopropyl alcohol). However, there's one particular connection on the board that worries me - see the attached pics. What do you think? Is the board toast? I'd be very grateful for any help! Cheers CG
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