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Thread: PET 2001-32N BS, with horizontal lines.

  1. #21

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    Yes, I understand. "Do only the necessary".

  2. #22

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    Quote Originally Posted by Muttley Black View Post
    Thank you!

    I prefer to disassemble all the keyboard for clean the keycaps too. I do your steps with isopropyl alcohol and I post the results here.

    One more thing I want to ask is the recap. I am looking forward to recap the electrolytic capacitors with good brand like Nichicon for example. It is a good move yes?

    Attachment 57777

    Also I want to do the same thing on monitor board.
    I want to make on this beauty a nice restoration and give him other 40 years of life.
    I donít know if it is normal but if I place my hand in monitor case the time is working, the screen shaking a bit.

    If you have any other restoration tips that you thing that i must do on this computer, i do them with pleasure!

    Thank you
    I've never found necessary to "recap" a PET. The original electrolytics were always in good working order (tested with an HP RLC meter). I don't believe one can "give 40 years" of life to anything, other components might fail too, and probably those won't be capacitors.
    I'd replace the small tantalums with regular electrolytics though (but I didn't do that on mine, since I can change components when they fail) as I did on some PET repairs for other people.

    Frank

  3. #23

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    Yes, i get the point. Thank you

    I decided to leave at least the hardware as is. And if in the future something fail, i do the necessary replace.

    Now i am in the middle of keyboard refurbish. Here some photos of the process, for those want to see.

    Photo 8-12-19, 18 29 24.jpg Photo 8-12-19, 18 29 25-min.jpg Photo 8-12-19, 18 29 25 (3)-min.jpg Photo 8-12-19, 18 29 25 (4)-min.jpg Photo 8-12-19, 18 29 25 (5)-min.jpg Photo 8-12-19, 18 29 25 (1)-min.jpg Photo 8-12-19, 18 29 24 (2)-min.jpg Photo 8-12-19, 18 29 25 (2)-min.jpg Photo 8-12-19, 18 29 24 (1)-min.jpg Photo 8-12-19, 18 29 25 (6)-min.jpg

    By cleaning the rubbers contacts and pcb contacts with isopropyl alcohol, all keys now seems to work perfect.

  4. #24

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    Quote Originally Posted by Muttley Black View Post
    Yes, i get the point. Thank you

    I decided to leave at least the hardware as is. And if in the future something fail, i do the necessary replace.

    Now i am in the middle of keyboard refurbish. Here some photos of the process, for those want to see.

    Photo 8-12-19, 18 29 24.jpg Photo 8-12-19, 18 29 25-min.jpg Photo 8-12-19, 18 29 25 (3)-min.jpg Photo 8-12-19, 18 29 25 (4)-min.jpg Photo 8-12-19, 18 29 25 (5)-min.jpg Photo 8-12-19, 18 29 25 (1)-min.jpg Photo 8-12-19, 18 29 24 (2)-min.jpg Photo 8-12-19, 18 29 25 (2)-min.jpg Photo 8-12-19, 18 29 24 (1)-min.jpg Photo 8-12-19, 18 29 25 (6)-min.jpg

    By cleaning the rubbers contacts and pcb contacts with isopropyl alcohol, all keys now seems to work perfect.
    In case you have some that don't make good connections in the future, I've found the copper paint used in windscreen defroster repair kits works wonderfully. You just paint on a thin layer for any of the carbon contacts that have become highly resistant.

  5. #25

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    Thank you. I keep this in my mind if I have problems in the future.

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