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Mr. Macintosh

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  1. Mr. Macintosh

    Macintosh Portable (backlit) battery voltage requirements

    Hmm. I’ll have to check on that. Would it be in the cluster where the hybrid chip usually is?
  2. Mr. Macintosh

    Macintosh Portable (backlit) battery voltage requirements

    Thanks for the reply. I tried varying the power supply down to 6.6V, and it says the battery is full at every voltage. At around 6.6-6.5V, heavy HD activity will freak the system out, but it’ll still run if I lower it from 6.8 down to 6.5 after I boot.
  3. Hello all, It’s been quite a while since I’ve posted here, and it’s good to be back! I had a quick question for you Portable people out there: I just recently recapped a clean-looking backlit model, and it seems to be working fine off of my bench supply running at 6.8v. The problem is, lowering the voltage to 6.7, 6.6, or 6.5v makes booting either hit-or-miss or impossible. Also, I bought a new 6V 5Ah SLA battery (not the cyclon pack) to power the system. Even after being charged up to its max of 6.6V, while connected to the original charger, the machine refuses to boot completely. Sometimes it gets farther on just the battery, but never all the way. I guess my question is this: is this normal for a backlit Portable? Is there some difference in the Cyclon battery that would bring it within spec? I would imagine the system should function properly at 6.5V given it’s designed to run for hours. Any insight is appreciated. Thanks guys!
  4. Mr. Macintosh

    Macintosh Portable Conquest

    Thanks! Of all the Macs I've worked with, this one is the most temperamental. Even a 512k that has four years on this thing is easier to repair and understand. Sometimes it boots, sometimes it doesn't. The keyboard is finicky (but the Alps keys are so good!). Overall: this one's going to take a while.
  5. Mr. Macintosh

    Macintosh Portable Conquest

    Yeah, I got the LA local eBay listing. I live in San Diego but the drive was worth it. It actually didn't work at first, I had to take it apart and clean the capacitor goo with alcohol and a toothbrush first. Only a temporary fix though.
  6. Mr. Macintosh

    Macintosh Portable Conquest

    Hey all, This is my first officially posted conquest. Although I've had more in the past, this one is especially cool to me. I got a EBay Local Pickup Macintosh Portable for about $5. It was missing a handle and the drive bay side of the cover, but everything else was untouched - it even came with the internal modem! Anyways, I bought a new battery and adapter for it and tried booting it up. After a couple errors, I checked to see if I had leaky caps. Not to the surprise of anyone, I did! I cleaned it up quickly with alcohol and a toothbrush, and although the speaker still doesn't work, it boots off of HD! I've included some pics of my progress, and am likely to get it recapped.
  7. Mr. Macintosh

    Happy 30th Birthday Macintosh 128k!

    Oh, and also check out Apple.com for a cool homage to the 128k!
  8. Mr. Macintosh

    Happy 30th Birthday Macintosh 128k!

    Hey guys, today is the 30th birthday of our beloved 128k Macintosh. I'd welcome you all to give a hearty "happy birthday!" In this thread and post any videos of the little guy you might have. Here's hoping for another 30 years of love for the one that started it all!
  9. Mr. Macintosh

    Anyone ever seen this happen to the DEF yoke connector? 128K

    Haha thanks! I really is satisfying to finally fix something you put so much time into.
  10. Mr. Macintosh

    Anyone ever seen this happen to the DEF yoke connector? 128K

    By the way here's proof
  11. Mr. Macintosh

    Anyone ever seen this happen to the DEF yoke connector? 128K

    Great news! I was doing some bend testing to see what area I needed to resolder, when I brush the J4 connector and the screen flickers on! So I resolder the J4 connector pins and viola! It works! That little bastard was hiding in plain sight! On another note, while peeking around inside, I noticed that the motherboard had a daughterboard installed on top of it. This must explain why my 512k is able to recognize the HD20 that came with it! I don't know what kind of voodoo magic is going on with that expansion board, but it somehow turned the computer into a 1024k 512ke! Super wierd because normally M0001w's aren't compatible with HD20s...
  12. Mr. Macintosh

    Anyone ever seen this happen to the DEF yoke connector? 128K

    Ha! Something even weirder just happened: for some reason when I bend the analog board, the screen returns to normal! When I stop bending it (towards the side wall) it goes back to black! Any thoughts?
  13. Mr. Macintosh

    Anyone ever seen this happen to the DEF yoke connector? 128K

    No, it's more of a "BNNNNNNNN" that goes continuously. I think it's coming from the actual CRT. Anyways, I just slapped the thing and I saw a flash of the "?" Screen. Also something new: when I slap the side, it sometimes restarts the computer and I get the startup bong but still no screen. Any clue why?
  14. Mr. Macintosh

    Anyone ever seen this happen to the DEF yoke connector? 128K

    Ok so I cut off the J1 connector and replaced it with another one, I resoldered the other end of the J1 connector (as well as C1) and tried turning it on. All I get now is either a loud "BUUUUU" humming noise, or a booting beep and that humming noise. The screen still doesn't turn on. What do you guys think?
  15. Mr. Macintosh

    Anyone ever seen this happen to the DEF yoke connector? 128K

    Thanks for the advice! So you're saying that most compact mac's J1 connectors can just start melting over time?
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