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  2. Compgeke

    Board repair recommendations

    Did you lift a pad or lift a trace? Lifting a pad is generally pretty easy to get around. You can scrape a little of the solder mask off the trace (carefully) and bend the lead over to solder onto that, run a small piece of wire from trace to component lead (if it can't bend) or just run a wire to bypass the trace\pad entirely. If you lifted an entire trace, that's a little more difficult and kind of an achievement on its own. In either case, try adding some liquid flux to the joints, adding new solder, adding a little more flux then using a vacuum desoldering gun to clean everything up. Once I got that done, I lift a lot less pads. There're plenty of people in they bay area give or take (myself included) but man, I only trust myself to repair my own stuff, don't think my skills are up for other people's stuff. [
  3. gpbonneau

    Apple CD SC question

    If you have problem with caps in the future, read this : http://www.asterontech.com/Asterontech/next_cdrom_refurb.html But not sure the drive is the same for CD SC ad CD SC Plus... bibilit has done that on mine and works great now, a vintage juke-box
  4. elbaroni

    SE/30 card question

    Aha! That's actually pretty obvious now that you say it. Thanks Bolle!
  5. Trash80toHP_Mini

    Farallon ETHERMAC LC NSC w/NuBus drivers in the SE/30 PDS?

    Good idea, but the LC side is abundantly clear given the physical constraints and obvious orientation. Glad I'm not alone. I'm used to the rows flip flopping between PDS and Passthru thruholes and again from component side to solder side. This is the first time I've mucked anything up this badly as far as prototyping goes, but the stuff I've done IRL is not to be believed! I'm liking the key pasteup I did for buzzing the address lines for you, shoulda' come up with that one ages ago.
  6. Grab an LC logicboard to actually verify things. I get this stuff mixed up all the time swapping rows and columns. Siome of the DIN connectors that come with the built in library in Eagle for example have rows swapped. You would think that A meets A, B meets B and C meets C when male and female plug into each other. Well, no Not in all cases at least. Took some time looking at cards and logicboards and what happens when they plug together until I got my own little library of connectors that fit the way like things are described in Apples documentation.
  7. bibilit

    Free Macintosh Plus!

    The cable connecting the A Board to the Logic Board
  8. Trash80toHP_Mini

    Farallon ETHERMAC LC NSC w/NuBus drivers in the SE/30 PDS?

    No such luck, it was rotated 180 degrees! I think maybe one +5V connection was right, but I'm probably wrong there as well. New worksheet for the map, even corrected the keying as seen from the solder/wrap side of the connectors . . . maybe. LC-030-Worksheet-02-001.PDF
  9. elemenoh

    Board repair recommendations

    I managed to lift three traces while removing a single ram chip on a 128K logic board. I know, I'm a terrible person. Do any of you have recommendations for someone who can repair logic boards, ideally in the San Francisco Bay Area? Thanks!
  10. Bolle

    SE/30 card question

    It tells the card if you have a monitor connected or not. Flip it to the left: no monitor connected - right: monitor connected.
  11. Basic goop would do the basic trick. Its cheap and functional. Worst case, if you think its too hot, just use something else. I use the premium stuff on my modern Macs (just re-did some 2012 minis), so I have Kyronaut to spare. I have yet to get a graphite pads.
  12. So you'd recommend the white goopy paste over a graphite pad?
  13. Bingo! Most people apply way too much and forget the conductive nature. Looking forward to the naked Sonnet pictures now.
  14. Trash80toHP_Mini

    Farallon ETHERMAC LC NSC w/NuBus drivers in the SE/30 PDS?

    When I screw something up I take it all the way over the top! I got the legend down exactly right, row numbers and the column designations both. It's a simple columnar transposition just like I thought, but not the numbers, it's every single signal that was transposed. I gotta laugh, shaking my head just doesn't quite say it . . .
  15. lowlytech

    schematic question SE/30

    Had a quick question on the last traces I have to repair on my se30. On RP2 Pin 13 I get continuity on R41, but I do not on UD12 Pin 18. On RP2 Pin 17 I get a beep on R42 but not on UC12 Pin 2. Same thing with RP2 pin 18, I get a beep on R43 but nothing on UC12 pin 1. The fact that I get a good connection between RP2 positions and the resistors on the back of the board, where could the break be? Inside the boards layers? Should I go ahead and run wires from the RP2 pins to UC/UD pins even though the resistors are showing good continuity?
  16. elbaroni

    SE/30 card question

    Hi all Any idea what this switch on the back of my SE/30's video card does?
  17. Most original Pentiums came with a very small heatsink and fan; later MMX series needed a chunkier HSF generally, and AMD/Cyrix equivalents generally ran hotter. I wouldn't slather the Pentium 100 in Arctic Silver - it's too big a die to cover and not needed (and conductive; in the day of Arctic Silver I'm sure it killed many components from incorrect application) - just use the generic white goop, once you've scaped off the tin foil pad and surrounding paste.
  18. Definitely not. That's a scratch on the disk, usually caused by contaminants on the read/write head of the disk drive. And if the scratch is deep enough, there goes your data with it. It's typical to see scratches on track 0. You ideally shouldn't see scratches on a disk, but if you do, it's usually on track 0.
  19. This happens all the time, and it turns out that you can clean the magnetic disk surface with a couple drops of isopropanol. It will cure a lot of I/O errors. This technique works with both 3.5" and 5.25" floppies.
  20. This has me wondering. Was the heatsink on these more of a CYA measure than an actual thermal solution? Did socket 7 chips really get that hot in the day? My buddy has a Pentium 133 underclocked to 75 and is, in his words, "practically cool to the touch."
  21. Haha, I was thinking about that exact graphite pad! I do have a large tube of Arctic Silver I haven't opened... I do know it'll be much messier. Maybe I'll see what the Crescendo looks like and order a couple pads or a larger pad (if they make it...) to save on shipping.
  22. Mid 90s Apple was all over the map when it comes to heat management, so it is not surprising they went with a thermal pad. This pad has been on my amazon shopping list for a while. If you do use a pad again, let us know what you used.
  23. Yep thats a thermal PAD - you can buy those and stick it on - they come in 0.5mm and 1.0mm. Better than using thermal paste due thickness. Cheers AP
  24. plot twist: it's NOT thermal paste! It was some metallic tape... gross all the same Explains why it was so difficult to extricate. I ended up using a nylon pry tool to twist it under the lip of the heatsink, minor scuffs on the heatsink itself from initially attempting to lift up the tape with a stainless ruler. Not sure if that heatsink is painted or anodized. Either way, wouldn't that inhibit thermal conduction?
  25. 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 this? Is it my monitor or is it a problem with the computer? 2. The computer will not recognize or boot from a known good SCSI hard drive. At the blinking floppy disk screen, the drive's activity light flashes briefly every second or so, but the machine will not recognize the drive. What is wrong with the SCSI circuitry on the logic board?
  26. Yesterday
  27. Hopefully. But I am starting to feel like that as much as I'm loathe to I should figure on starting to move as much as possible to floppy emulators. (Just this week I flashed my first pair of Goteks with FlashFloppy. Initially got them intending to put one in a TRS-80 Model 4, but I think my recent Tandy 1000 EX acquisition has jumped to the front of the queue. Need to get some ribbon cable and adapters still, though. Feh.)
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