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Found 15 results

  1. macalle69

    Macintosh Classic Ram problem

    Hello Folks I recently acquire a Macintosh Classic for parts not working , logic board was pretty clean without battery explosion, as usual I washed Logic board and recapped with new radials capacitors . at the first start up no chime and distorted checkerboard pattern , I then replaced VIA and Classic start up with chime and apparently works but required at start up more ram even if expansion board was installed ( System 7.0.1) At this point I started up with system 6.0.7 floppy and discovered that only 512k ram were "detected" with or without ram expansion board installed ( at least the onboard 1 mb should be detected ) According with Ferrix I replaced the two multiplex MUX , no success . Floppy drive works , SCSI ok , adb ok , start up with Rom ok . Any suggestion ? thank you!
  2. Caroline

    Macintosh Classic

    I have a Mac Classic that suffered some battery leakage, damaged capacitors and the Y1 oscillator broken. I have cleaned up the board a bit and replaced the capacitors and am replacing the oscillator tomorrow. Should this fix the board (its currently showing a chequerboard screen when turned on)?
  3. Hi there, I have got a macintosh classic with a broken motherboard. It gives horizon lines and doesn't boot. I have tried a lot. I have cleaned the motherboard with alcohol, I have cleaned it in soapy water, I have replaced all capacitors, I have checked the traces and contacts, all with no succes. When I got this mac it had a bad battery leak but thankfully no traces were erased but I think (having tried almost everything) some chips got effected by the battery acid. What else can I try other than replacing the motherboard? All sugestions are more than welcome! Thanks, Luuk.
  4. castroa320

    Macintosh Classic no sound

    Hi everyone. I recently pulled out my Macintosh Classic from the closet so I can play around with it. I acquired it on a eBay auction a couple of years ago. The Macintosh has a 500 mb hard drive with 4MB of RAM installed. The little machine runs great but lacks sound. No startup chime or anything but boots right into System 7.5 that I installed fresh less then an hour ago. I go into the Control Panel for sound and it still plays nothing even though the volume is on max. I've plugged in my external speaker and it makes very little sound. I've even tried out the Control Panel for sound as well with the speaker. I've read on here and, on other sites, that washing the motherboard can resolve problems with leaking capacitors and all that. My motherboard seemed really clean but I still went ahead and gave it a little bath and let it dry for about 24 hours. I plug it in and I'm back to square one. I know that this problem has been talked about on here and other places on the internet but I want to know any other solutions other then recapping(if possible). I have no experience with soldering and all that and don't know any LOCAL places where I can get my motherboard recapped. All those services like MacCaps seem great but I'd prefer a local repair shop or something if thats the worst case scenario. Any tips will be appreciated! Thanks!
  5. SlateBlue

    Macintosh Classic AB Recap

    Hi everyone. I thought I'd take the time to create a post about my recapping adventure, and maybe take the opportunity to ask a few questions. If the is dry reading for you, I apologize. I'm not known for being a good storyteller. So, for starters - A several months ago, I acquired a Macintosh SE and a Macintosh Classic. The SE appeared to work just fine (still has original caps on board), and was in overall good condition with minimal yellowing. The Classic would boot fine, but had no sound, and the case had significant yellowing. I removed the logic board from the Classic to find that all the SMD caps were leaking. I set the SE aside and went to work on the Classic. After a botched repair attempt (a couple of lifted pads), I sent the board to Novi, Michigan for a professional recap job. The recap fixed the sound issue, but I still had yet to tackle the cosmetic issues of the machine. Pressed for time on other projects, I set the Mac Classic aside to be worked on at a later date. Last week, I finally took the time to completely disassemble the Mac Classic so I could retrobright the front bezel and rear case. I also took the time to blow compressed air over the AB to remove years of dust. Upon reassembling the computer and powering it on, it seemed the hard drive would quite spin up. It would try, and with each attempt the screen would flicker. Thinking I had a bad hard drive (it worked weeks prior), I swapped a known good working one to find that the issue persisted. I then realized I likely was dealing with a voltage issue. I measured both +5v and +12v at the external floppy port and realized the voltage readings were low ~ around +4.8 and +11.65 respectively. So, I adjusted PP1 until both voltages were in an acceptable range ~ +5.05 and +11.99. I suspected that the compressed air had somehow turned the potentiometer and decreased the voltage. Yesterday, after cleaning the floppy drive, I noticed the screen would appear to shake/wave slightly as the disk drive was working. Thinking again that I had a voltage issue, I measured at the external floppy port again. The voltages were ~ +5.15 and +11.77. At this point, I realized adjusting PP1 wouldn't fix the issue. Too little voltage is worse than too much, right? So, I removed the AB and desoldered the caps from the bottom left/center of the board (yellow box in attached photo) to find them all leaking. I guess it's time to recap the AB now. My questions: I know that I must match the capacitance and voltage ratings of the original caps. Must I also match the physical size? Can someone explain whether one should choose General Purpose or Low Impedance caps and why? I searched the Interwebs and could not find a capacitor list for a Macintosh Classic Analog Board. Can I get away with leaving the smaller (physical size) caps alone? None appear to be leaking. Thanks!
  6. From the album: Macintosh Classic Analog Board Replacement Components

    DP5 - rectifier - original: BYT03 300 C039 - replaced with: BY399 800V 3A
  7. From the album: Macintosh Classic Analog Board Replacement Components

    DP5 - rectifier - original: BYT03 300 C039 - replaced with: BY399 800V 3A
  8. From the album: Macintosh Classic Analog Board Replacement Components

    RP40 - resistor - original: Red Red Brown Gold (220 Ohms 5%) - replaced with: Red Red Black Black Brown (220 Ohms 1%)
  9. From the album: Macintosh Classic Analog Board Replacement Components

    QP2 - transistor - original: CET 48C0 CEF02N6 - replaced with: IRFBC40
  10. From the album: Macintosh Classic Analog Board Replacement Components

    CP23 - blue ceramic capacitor - original: HR R 271J 2KV - replaced with: B 271K 3KV (270pF 3000V)
  11. I've bought a Macintosh Classic computer recently, it was in a very nice condition with original keyboard and mouse, but with an issue of a chessboard-like pattern displayed on the screen all the time. At first I thought that it might be caused by capacitors leak on the logic board, but after I've cleaned the logic board in a dishwasher and than with pure alcohol, nothing happened — the pattern on display was the same. So I decided that caps are dead and need to be replaced. I've replaced all the capacitors on the logic board, but again with no result. After that I've found the information about this issue might been caused by broken capacitors on the analog board, so I've replaced a group of caps mentioned here (http://www.maccaps.com/MacCaps/Capacitor_Reference/Entries/1990/10/15_Macintosh_Classic_Analog_Board.html) total 8 caps, although they aren't all the same as in the guide, cause I have a later model (1992) I suppose. Still no result, the pattern on the screen is absolutely the same. What else could I try? Any help or ideas are much appreciated!
  12. I picked up a Macintosh Classic knowing it was non functioning for a very nice price. It has horizontal lines across the screen on start up with no bong. When turned off and on a few times its horizontal lines are scrambled into a mess. It needs a new PRAM battery. Will it boot without the PRAM battery? My guess is it is the capacitors. I've had the motherboard out to lightly rub the areas around the capacitors with methylated spirits. It had a very little amount of capacitor liquid on the board. It seems to have not done much damage and the motherboard is in very good condition. I would like to know how to remove the ROM chip so I could wash it. Thanks
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