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Thread: Newbie - Just acquired a CBM 3032

  1. #1

    Default Newbie - Just acquired a CBM 3032

    Hello,

    I have just joined the forum because, thanks to Ebay and a drive half-way across the country. I am now the pleased owner of a Commodore PET CBM 3032

    It is lovely and clean ( on the outside ) and powers up reporting 31743 bytes free. The screen display is nice and bright, only slight issue is that it wobbles just a little... nothing terrible, and I could almost live with it - but it would be good to fix if possible.

    I want to give it a little TLC under the hood because it is very grubby and dusty inside having spent the last couple of decades in a loft.

    Can anyone suggest the best approach for cleaning inside?

    My current plan, is to remove the board itself and use a compressed air can to get the worst off, then use some WD40 Specialist Contact Cleaner.

    Is it sensible to remove the socketed chips before air dusting and contact cleaning? and are there any tools or techniques for treating these chips carefully? I would hate to go from a working dirty board, to a clean broken one!!

    https://www.dropbox.com/s/ra8xwexqz7...24_12.jpg?dl=0

    -Alec

  2. #2
    Join Date
    Feb 2009
    Location
    Southern California, USA
    Posts
    2,343

    Default

    Alec,
    Not sure I would use WD40. I would use Isopropyl Alcohol 90% + pure to clean the board. Any excess will quickly evaporate. You do not want water vapor in the board. I would leave board in chassis and plugged in (with power off) so there is a good ground before using compressed air as it can create some static electricity.

    Here is picture of a good IC puller and and an IC insertion tool to avoid bending IC pins. You need the one that can handle 24 to 40 pin devices for the ROMs and I/O chips.

    70176423_large.jpg40J743_AS01.jpg

  3. #3

    Default

    Thanks for the information Dave, I shall get myself a puller. I plan to remove the board entirely from the base unit so I can clean both sides, and the base unit itself. Good tip on the grounding too. I'm slightly paranoid about killing my lovely machine with kindness

    Btw, I wasn't thinking of standard WD40, but rather their Contact Cleaner...

    https://wd40specialist.com/products/contact-cleaner/

  4. #4

    Default

    If for some reason it has white sockets, which a3032 shouldn't, I wouldn't think, don't remove the chips, don't even touch them. Once you move a chip in those, or especially remove one, they tend to quit working.

  5. #5

    Default

    Quote Originally Posted by bizweb View Post
    Hello,

    I have just joined the forum because, thanks to Ebay and a drive half-way across the country. I am now the pleased owner of a Commodore PET CBM 3032

    It is lovely and clean ( on the outside ) and powers up reporting 31743 bytes free. The screen display is nice and bright, only slight issue is that it wobbles just a little... nothing terrible, and I could almost live with it - but it would be good to fix if possible.

    I want to give it a little TLC under the hood because it is very grubby and dusty inside having spent the last couple of decades in a loft.

    Can anyone suggest the best approach for cleaning inside?

    My current plan, is to remove the board itself and use a compressed air can to get the worst off, then use some WD40 Specialist Contact Cleaner.

    Is it sensible to remove the socketed chips before air dusting and contact cleaning? and are there any tools or techniques for treating these chips carefully? I would hate to go from a working dirty board, to a clean broken one!!

    https://www.dropbox.com/s/ra8xwexqz7...24_12.jpg?dl=0

    -Alec
    I've repaired quite a few PETs by now. I wouldn't even dream of removing the board or reseating the chips if everything works fine. Just dust it off with compressed air if anything.
    I would really leave it alone otherwise.

    HTH
    Frank IZ8DWF

  6. #6

    Default

    Thanks for the warning. The sockets are white and are in place for Four big chips: 6502, 6522, 6520x2 and all the rom/eprom. None of the memory or other chips are socketed.

    Heeding your warning about the white sockets, I will leave them where they are. Although I am still mindful to remove the board itself so that I can both; make a good job of cleaning inside the base, and to clean the solder side of the board.

  7. #7
    Join Date
    Feb 2009
    Location
    Southern California, USA
    Posts
    2,343

    Default

    Quote Originally Posted by iz8dwf View Post
    I've repaired quite a few PETs by now. I wouldn't even dream of removing the board or reseating the chips if everything works fine. Just dust it off with compressed air if anything.
    I would really leave it alone otherwise.
    Frank,
    I'd have to agree. With a Commodore, leave well enough alone. Some collectors have a fascination with 'pretty' PETs. I'm just glad mine works. To do almost anything on a PET will flex that thin motherboard, and can create havoc with broken traces, cold solder joints deciding to get intermittent, etc.
    -Dave

  8. #8
    Join Date
    Feb 2015
    Location
    Cleveland, OH, USA
    Posts
    494

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    Quote Originally Posted by bizweb View Post

    I have just joined the forum because, thanks to Ebay and a drive half-way across the country...
    ? 40 miles?

    Quote Originally Posted by bizweb View Post

    Can anyone suggest the best approach for cleaning inside?
    To add to the suggestions already made: Commodores seem particularly susceptible to static-electric discharge. I fried a pair of serial-port line-driver ICs one winter without even opening the case. Accordingly, pick a damp day with mild temperatures to do your exploration. I would listen to those who advise leaving the chips seated and rather than using compressed air to dust things off you might try this approach, suggested by the venerable ChuckG: Use a dampened (not dripping, not wet) paintbrush to gently brush away any surface dust from either side of the board.

    Best of luck and enjoy your new plaything.

    -CH-

  9. #9
    Join Date
    Dec 2005
    Location
    Toronto ON Canada
    Posts
    6,807

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    Boy, what a bunch of pussies

    If they're at all greasy I spray boards with Fantastik/Formula 409, brush with an old toothbrush, rinse well with water (optional: distilled, followed with Isopropyl) and dry with a fan; never a problem.

    I do agree that you should leave ICs in their sockets and try to avoid flexing the board, and don't rub the cat's fur or shuffle across your nylon rug.

    All at your own risk of course!

    m

  10. #10
    Join Date
    Feb 2009
    Location
    Southern California, USA
    Posts
    2,343

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    Quote Originally Posted by MikeS View Post
    ... and don't rub the cat's fur or shuffle across your nylon rug.
    Mike,
    I can always count on you for great ESD safety tips!
    -Dave

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