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mtm84

6502
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About mtm84

  • Birthday February 14
  1. mtm84

    Classic II re-cap

    Small update, finally got around to ordering the parts, just waiting for them to get here. In the mean time I decided to try starting it up, and managed to get a chime and a gray screen, but then there's some crackling from the AB and it goes blank again. So not sure if that's more bad caps on the AB that I haven't replaced yet, or just related to the the power control IC. But hearing a chime is good news to mean since it means the logic board gets as fair as reading the rom chips. I think. edit: I should add that while it did chime, the hard drive did not spin up. I know the drive is good because I checked it in my IIsi.
  2. mtm84

    $4 Macintosh IIsi

    I don't think I've ever seen an old used mac at the three goodwill's near me. I'm not sure they even sell computer stuff in general any more. I need to tell 21 year old me to buy up all this stuff back then.
  3. mtm84

    Classic II re-cap

    Yes I cleaned the LB with 99% IPA. Checked all the caps on it as well and some seem connected to ground but without a schematic I have no idea if that's supposed to happen or not, so I'm kind of probing blind here. Got some digikey or mouser part numbers I can look at for the diodes and IC's?
  4. mtm84

    Classic II re-cap

    Re soldered C4, and recapped most of the Analog Board, still no boot chime, blank screen. Volts from the hard drive connector still reading low. 4.50 and 11.50 with the motherboard hooked up, 5.12 and 11.10 without the motherboard hooked up. Case fan turns on, and that's about it. Not sure what I'm going to check next.
  5. mtm84

    Classic II re-cap

    Not particularly pretty but as far as I could tell with a multi-meter all the solder connections were solid. The bodge wire on C9 is embarrassing though and i just noticed some corrosion on the ADB port by C3. so I will probably have to clean under there and re-solder that, which I'm not looking forward to but it will give me a chance to take a better look at C3.
  6. mtm84

    Classic II re-cap

    Guess I will have to see if I get more life after recapping the Analog Board. Would be discouraging if I fried the logic board replacing its caps
  7. mtm84

    Classic II re-cap

    I mean exactly what it says on the tin. Screen was blank, like it had no power at all. I am currently waiting on new caps from mouser, and in the mean time have removed the old caps and cleaned up the board. only a few of the caps were leaking but could be the cause. I'm not entirely convinced that I don't have a short in the board somewhere either from one of the replacement caps, but it will be a few days before I'll be able to try again.
  8. Got 80 bucks? http://www.memoryx.com/pb140024.html Though I would call or email them first, they don't always actually have items in stock when they say they do. That's the price you pay for making your own ram I guess.
  9. mtm84

    Classic II re-cap

    Using a multi meter and probing the molex connector, i got the following voltages: 10.85 on the orange, and 4.68 on the red. Pretty sure that's well outside the normal range of 12 and 5. Guess the analog board is up for a recap for sure. edit: after letting it sit on for a bit I ended up around 4.75 and 11 volts. Still to low. Also the popping sound stopped, but it doesn't chime at all now and the screen is dead. So I assume something burned out but I'm not sure what.
  10. mtm84

    Classic II re-cap

    So I found some very nice and clear pictures in this thread, and I was able to get a very small wire connecting the cap to the via at the end of the trace for c9. Trying to turn it on the first time after recapping the board, I got a start up chime, but then heard some electrical pops and decided to turn it off. trying to turn it on again results in the same popping sound and no chime. Before I re cap the analog board, is it possible I have a short in the motherboard? What is the standard behavior for a classic II with not motherboard in it at all? Another issue, when I took out the roms before giving it a soap bath, I ended up breaking pin 1 on one of them. From everything I could find on the internet, pin 1 is only used for programming the rom, and from what I see on the board, all 4 chips have pin 1 connected to each other and nothing else. The chips are AM27C010's if anyone knows if that is right or if I need to fix or replace that chip. Tried powering it on without the motherboard, fan turned on, but no display. Is that normal for a classic II sans motherboard? On the plus side, no popping sound, so guess i need to double check my caps.
  11. mtm84

    Classic II re-cap

    I got a Classic II that just displayed a checkerboard pattern. In the process of replacing the mother board caps with tantalums I managed to lift off both pads of capacitor C9. Does anyone know where those traces go so I can wire it up? Or should I just not bother now?
  12. mtm84

    Powermac 9600 G3 problems

    There is small metal clip that supports the original CPU card just fine, but it doesn't do my upgrade any good since this particular one is a very small board compared to some of the other upgrades I've seen. It's no wider then the CPU socket itself. Everything is pretty tight though and there isn't much play in the card.
  13. mtm84

    Powermac 9600 G3 problems

    So a bit of an update, I never did figure out why the upgrade liked some ram in some slots but not in others. Seeing as how it works with the 512 megs I have and I don't plan on maxing it, I'm not going to worry too much about it. As an FYI for things mentioned above, I did not see any signs of contact corrosion, I did use compressed air to blow them out but didn't try any contact cleaner or the like. I had already disabled speculative access as well as reapplying the heat sink with fresh thermal material, mostly because I had to replace the small fan that came with it when I broke a couple of blades by being... over zealous with compressed air while cleaning out all the gunk that had built up over the years. I am ashamed to say this particular 9600 is in pretty rough physical shape so is even more prone to gathering dust and debris. When I bought it off eBay the seller shipped it in quite a large box with quite not a large amount of shipping material protecting it. Perhaps a dozen news paper pages waded up? It arrived to me with almost every plastic tab on every case panel/bezel snapped off, and parts of the frame slightly bent. At the time I didn't much care since it worked just fine and I thought it looked "cool", but years later I still kick myself for tossing the broken pieces instead of trying to fix them. Live and learn, and I thank everyone for their help in troubleshooting.
  14. mtm84

    Macintosh "Case Cracker"

    I bought a "mac tool" from Fry's (I think) in... 2002ish? Still has the label on it. "SCREWDRIVER. EXTRA LONG SHAFT".
  15. mtm84

    IIsi Internal SCSI

    Well I took a look at the caps, they actually all looked fine on the motherboard, but replaced them with tantalum anyways just to be on the safe side. hard drives still wouldn't show up. Then I stumbled upon a IIsi service manual pdf that said first thing to do for hard drive powering on but not showing up was replace the ribbon cable, and low and behold it worked just fine. It's always the easy things you miss! Now, which system do I want to put on her...
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