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Thread: Dead Apple IIc Plus

  1. #1
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    Default Dead Apple IIc Plus

    I have a dead IIc+ I would like to get running. On the off chance someone here may have seen symptoms similar to this I'm posting a couple shots of the screen. The first one shows up when powered on. The second one will show up after resetting the box a few times.

    Does the same thing regardless if the keyboard and floppy drive is connected or not.

    I've tried reseating all the socketed IC's in there but, no change. As rare as the IIc+ seems to be I may not be able to find parts anyway if its anything custom.

    Any thoughts ?
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  2. #2

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    I saw screens like this a lot when I was repairing my Apple IIs. Sometimes it was RAM, sometimes it was one of the logic chip.

    At least you are getting video, so that circuitry is probably ok.

    Tez
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  3. #3
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    I just found a corroded and broken resistor R57. Going to replace it and see what happens. Wish I could find IIc+ schematics to see what it connects to. I'm not sure if it corroded and broke off or blew up. Its too messy to tell but, if it was voltage maybe whatever is downstream of it took a hit too.


    edit: OK that didn't fix anything but, it needed to be replaced anyway. Never had a single resistor take down a computer before anyway.
    Last edited by leaknoil; November 15th, 2008 at 03:13 PM.

  4. #4
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    What's the major difference between the IIc and the IIc+?
    Legacy Computers and Parts

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  5. #5

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    What do you get when you power it up with the keyboard disconnected? (That forces it into built-in diagnostics)

    It's been so long since i've worked on a //c+ that I don't remember all the issues I've seen on them... Hell, it's been since the mid 90s.

    Since it appears to not be doing anything, I'd start with checking the monitor ROM and the CPU.

  6. #6

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    Quote Originally Posted by Druid6900 View Post
    What's the major difference between the IIc and the IIc+?
    The major differences between the IIc and the IIc+ are built in 4MHz Zip Chip and built in 3.5 drive in the IIc+. There may be others but those are the two biggest differences I know of off the top of my head.

    Dean

  7. #7
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    Quote Originally Posted by Druid6900 View Post
    What's the major difference between the IIc and the IIc+?
    Difference is I own one but not the other.

    hehe, I had to.

    --Jack
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  8. #8
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    Quote Originally Posted by magnusfalkirk View Post
    The major differences between the IIc and the IIc+ are built in 4MHz Zip Chip and built in 3.5 drive in the IIc+. There may be others but those are the two biggest differences I know of off the top of my head.

    Dean
    Also, the keyboards are different, as I discovered once when trying to resurrect a //c+ with parts from a //c. Not just the key layout, the keyswitches themselves are not swappable. Of course, with the different key layout, the plastics do not interchange either. (just a heads-up, in case you're tempted to grab a //c for parts).

    --T
    Teach your children how to think, not what, and hold 'em close, not tight.
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  9. #9
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    Quote Originally Posted by channelmaniac View Post
    What do you get when you power it up with the keyboard disconnected? (That forces it into built-in diagnostics)

    It's been so long since i've worked on a //c+ that I don't remember all the issues I've seen on them... Hell, it's been since the mid 90s.

    Since it appears to not be doing anything, I'd start with checking the monitor ROM and the CPU.

    It goes to that first screen without the keyboard attached as well. Just have no keys to press to get to the second screen.

  10. #10
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    Quote Originally Posted by Terry Yager View Post
    Also, the keyboards are different, as I discovered once when trying to resurrect a //c+ with parts from a //c. Not just the key layout, the keyswitches themselves are not swappable. Of course, with the different key layout, the plastics do not interchange either. (just a heads-up, in case you're tempted to grab a //c for parts).

    --T
    I have a IIc here I disassembled to see if there were any parts I could swap and there really aren't. Pretty much everything is unique to one or the other. Of course the few parts that are them same are soldered to the motherboard on one or the other.

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