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  2. I have not opened the IIfx PS as this is relatively new to me and I don't know if it has been. I will crack it open today if time allows. As to the tester, it is not a top-shelf model but has served fine on my replacements for SE/30, IIsi and IIci power supplies with SeaSonic PS as recapping is not in my skill set.
  3. Today
  4. tried another LCD, I don't think the problem is the LCD , it would be uniform all across. Not just the background.
  5. jimjimx

    Classic II over and under volt. Help

    I think I’m going to start with the caps and see where the rails are at from there, and probe around to see what’s doing what.. Too bad I don’t have the parts here & now. I think I’ll double the order.
  6. Crutch

    (Failed) Conquest

    @tokyoracer American services are that same way. They will leave a note and reschedule if they can’t make a delivery that is identified as requiring a signature. This sounds like a delivery person just screwed up.
  7. elbaroni

    MacTablet...maybe not.

    Fair - a late night whinge is not going to get me any help! It’s a Summagraphics MacTablet. The power plug plug comes off the serial port like so: and its its plug looks like this: I’m now wondering whether it might worked plugged into the little device that comes with a Thunderscan which harvests power from the floppy port. Will have to try that out, but in the meantime — anyone got one of these adaptors?
  8. BadGoldEagle

    SE FDHD Restoration

    What kind of voltages are you getting around the floppy port? Did you patch the big trace and its via (shown in red in the picture below)? I can't see it on this side of the board, perhaps you patched it from the solder side? If it was, then I would check the voltages on each chip (not the filters of course, they aren't needed for now). If all checks out fine, then I'd take the oscilloscope to the CPU to check if the reset line is not stuck or something... The ROM and/or its socket could also be bad.
  9. BadGoldEagle

    IIfx power supply voltages?

    The white wire (5V) is too low I would say and the rest a tiny bit too high. Has it been recapped? Is the LB you're using to test the PSU working correctly? If not, it might draw too much on the 5V...
  10. tokyoracer

    (Failed) Conquest

    Glad to hear you got your package. It was good of them to look after it for you, though why they couldn't leave you a note to let you know is beyond me. Why do American services do this? Here in the UK they have to leave it in a secure place or a neighbour. Otherwise it gets taken back to a depot, post office or rescheduled for a different day. As for Clockometer. Il have to check that out myself and see what it says for my machines. Was always curious if they're running at correct speeds, thanks for the heads up! I remember having a couple of LC's with the 'wrong' MHz rated CPU, I always wondered what it was actually clocked at. I sold them before I could ever find out sadly.
  11. LaPorta

    SE FDHD Restoration

    oldappleguy, your offer is most gracious. I do have a donor board if I need it, I was just hoping to have this one work out. I'll try a bit more...if not, it may just become one of my scrap practice boards! I wish I had TechEdison and thoise guys here with suggestions!
  12. dochilli

    Classic II over and under volt. Help

    I would replace DP3, DP4, CP4, CP5, TDA4605, IRFB40 and CNY17G-3. These are often defect.
  13. Hi All, The IIfx is in queue and I am trying to find out if my power supply is putting out proper voltage. I have one board that will start the PS and when I test it I get: 5 Reds: 5.13 1 Yellow: 12.14 1 Blue: -12.11 1 White: 4.23 Is anything off here? THx!
  14. I'm trying to troubleshoot a bad Mac Plus analog board. I was given the computer in non-working condition probably 20 years ago, and I've never really made much of an effort to repair it. I just fixed another Plus analog board by re-soldering connector pins, and that has me excited to try and fix this one. I plugged its logic board into the working Plus chassis, and confirmed that it is good. When powered on, the speaker on the analog board makes a high pitched, chirping, sounding like it's being modulated by an envelope generator controlled by an LFO. With the logic board connected, there is no startup chime and no picture on the screen. With the logic board disconnected, I measure 13v _AC_ on pin 6 of the logic board connector, which should be 5v DC. The same on the 12v line. I measured some resistances across diodes that, according to "Dead Mac Scrolls" would indicate that the FB transformer is bad, if they read 0 ohms, but they were pretty close to the values the book claimed they should be. Measuring across CR20 as per p. 24 I got a resistance value that kept increasing, as if it was charging a capacitor somewhere, but it was definitely not 0 ohms. On p. 25 of DMS, it suggests replacing a number of capacitors, which I may do. They aren't visibly bulged or leaking electrolyte, but I do understand that they may fail without any visible sign. But the fact that I'm getting an AC voltage on what should be DC power supply lines to the logic board, and the chirping speaker, make me think that some kind of rectifier is gone. Could my odd measurement across CR20 indicate that it is not shorted but rather open? Other thoughts before I go blindly replacing caps? JCE
  15. Calibration of the monitor? Try another video cable or LCD, make sure you let it auto adjust.
  16. maceffects

    Is an inverter bi-directional: 74LS04 specifically?

    @ZaneKaminski Thanks! Most of that makes sense to me. And considering I'm not an engineer, that's a good think. @Trash80toHP_Mini will be busy for the next couple weeks with other projects, but after that we will try to make something happen. We will let you know what we find. Thanks again!!
  17. oldappleguy

    SE FDHD Restoration

    I have a se fdhd mother board I can send you. Just pay the postage. It's a new old stock in a sealed static bag. 661-0536 part number.
  18. Can you guys help me with this strange artifacting on my 8500? I am having a suspicion it could be the VRAM SIMMS, but what do I know? That's why I'm asking You can see that it only seems to affect the background Not the windows themself.
  19. LaPorta

    SE FDHD Restoration

    I re-verified each and every pin on each socket for continuity...all are good. The next thing on my radar is this "8530 SCC" IC....basically, I don't know what the heck it does, but it is the last thing that I can see that may play a vital role that was near the battery that might not work. I have verified all the traces I repaired vs. the companion logic board I have and they check out. The only thing that I could figure otherwise is maybe an IC itself is shot, and that I don't know how to prove or disprove.
  20. AwkwardPotato

    SE FDHD Restoration

    Weird... just guessing, maybe the battery leak damaged the ROM sockets and reseating the chips broke another one of the connections?
  21. In 7.1, it's simply Monitors. I believe 7.6 changed to Monitors and Sound. Did you find the model number of your monitor?
  22. dcr

    SE FDHD Restoration

    That's what happened to me when I resoldered the analog board on my Mac Plus. I went from getting video when I tapped on the side to no video at all. I went back and resoldered all the spots I had resoldered before plus any spots that looked in any way imperfect. It's worked since then.
  23. LaPorta

    SE FDHD Restoration

    Well, I resoldered a few points, replaced R9 which appeared to be faulty, cleaned and reseated all of the ROMS...and now I get no video at all. Sigh...not sure how I made it worse.
  24. jimjimx

    Macintosh Classic II Blues... :/

    Again, there’s no fact that a CRT will kill you....... Thats until you or me become “statistic #1” Be carful !!! Dont make truth the fact.
  25. hageir

    Macintosh Classic II Blues... :/

    Ah, thank you very much! That eases my mind, I had a Performa the other day that had a rather crusty CRT, I was on needles the entire time, just waiting for it to catch fire in the kitchen LOL
  26. jimjimx

    Macintosh Classic II Blues... :/

    It’s known that nobody ever died from a CRT shock. It might hurt like hell, but there is *NO* record of anybody dying from a CRT.
  27. Yesterday
  28. LaPorta

    Macintosh Classic II Blues... :/

    I just got a scope for the first time...wish there was a tutorial on how to use it!
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