• Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.

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  1. AlexTheCat123

    Lisa PCB Silkscreen Font

    Thanks for all of the suggestions guys! If we're not able to find the original font from Apple's CAD package, I'll definitely look into the Fontographer thing. I hadn't considered recreating the font using the original text as a template, so thanks for giving me that idea if all else fails!
  2. AlexTheCat123

    Lisa PCB Silkscreen Font

    Hi guys! I asked this same question on LisaList2 yesterday, but I figured I'd post it here too in case anybody can help. I've been working on replicas of a bunch of Lisa PCBs lately and so far I've been able to get everything really accurate to the originals, with the exception of one thing...
  3. AlexTheCat123

    Apple Lisa No Video

    All of the PSU voltages seem to be fine.
  4. AlexTheCat123

    Apple Lisa No Video

    I checked/reseated the connectors and they seem to be making contact just fine. What should I try next? I'm guessing the problem has something to do with the lack of the 300V and -100V voltages or the 5V bus that is too low.
  5. AlexTheCat123

    Apple Lisa No Video

    I have replaced all of the capacitors as well as the TDA1170 chip and nothing changed. I'll check the connectors right now to make sure that they're making contact. Do you have any tips on getting a multimeter probe down on the bottom part of the video board? It's really hard since there's a...
  6. AlexTheCat123

    Apple Lisa No Video

    I have an Apple Lisa 2/5 that was working fine up until about a month ago. The screen started randomly collapsing to a horizontal line and eventually got to the point where it was unusable because it was a horizontal line all of the time. After a few weeks of troubleshooting, I found that the...
  7. AlexTheCat123

    Mystic Color Classic Repair

    I just received a Color Classic with a Performa/LC 575 logic board (https://www.ebay.com/itm/Apple-Macintosh-Color-Classic-MYSTIC-computer/233213293063?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649) and I am trying to get it running again. I tested the computer with my...
  8. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    That is very strange. The link still works fine for me.
  9. AlexTheCat123

    Does anyone know what this symbol means?

    Thanks pcamen. That's what I was thinking, but I wanted a second opinion just to make sure.
  10. AlexTheCat123

    Does anyone know what this symbol means?

    I am currently repairing a Mac Classic II that I picked up a few weeks ago and I have found a capacitor that appears to be burned on the bottom of the logic board. Of course, I need to replace the cap (C39), but the schematic for the logic board shows a weird symbol after stating the value of...
  11. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    Unfortunately, there is not. Five or six of the pins are broken off entirely and several of the pads on the motherboard have been completely eaten away by the corrosion.
  12. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    Really? If that is that case, then it would be really cool if someone could program a microcontroller to emulate the PRAM chip.
  13. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    Darn. I guess I won't be able to get the Quadra working after all because replacement RTC/PRAM chips seem to be pretty much impossible to find.. Thanks for all of the help!
  14. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    I am certain that the SCSI drive has a compatible OS on it because it is running System 7.5. According to my research, U92 is the RTC and PRAM chip, so that shouldn't have anything to do with the SCSI bus, right? It is a relief that the green tint is probably not a problem with the computer...
  15. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    I tried desoldering and resoldering U92, even though it is missing some pins, and to my amazement this caused the computer to boot to the blinking floppy disk screen. It will boot just fine from floppy, but I now have two more problems. 1. The screen has a greenish tint to it. What is causing...
  16. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    I have now replaced all of the parts that were missing, with the exception of C61, which I have not ordered yet, and U92, which is only hanging onto the board by only a few pins. I now get a startup chime when I turn the computer on and the reset and interrupt buttons seem to work fine. However...
  17. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    Thank you for the pictures! I agree that it appears to say IA5. I believe this means that it is a 0.1uf capacitor.
  18. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    Can you tell me the code on capacitor C61? I can read all of the numbers on all of the components except for that one. 
  19. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    Thank you! That is perfect!
  20. AlexTheCat123

    Macintosh Quadra 700 Battery Leakage

    Thank you for the picture! Unfortunately, I can't make out the values of those parts, so those additional photos would be great!
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