Image Map Image Map
Page 3 of 3 FirstFirst 123
Results 21 to 26 of 26

Thread: Macintosh Classic Monitor Issue

  1. #21
    Join Date
    Apr 2015
    Location
    Austin, Texas
    Posts
    1,024

    Default

    Quote Originally Posted by tempest View Post
    Are those affected by the analog board? If so, would recapping it fix the issue?
    Most likely.

    Quote Originally Posted by tempest View Post
    My SE seems to be working just fine except for a flaky disk drive. Anyone know where I can get a replacement 800k drive?
    Before you look for a replacement, try cleaning the heads with a cuetip soaked in alcohol and relubricate the head rails with lithium grease.

  2. #22

    Default

    Quote Originally Posted by GiGaBiTe View Post
    Most likely.



    Before you look for a replacement, try cleaning the heads with a cuetip soaked in alcohol and relubricate the head rails with lithium grease.
    Be super careful when cleaning the heads; they are only held in with some sort of foil and glue.
    System 80 Expansion Interface located! Thanks to all who helped out and the good people in the NZ vintage computer forums!

  3. #23

    Default

    BTW this is what the monitor is doing now: http://www.atariprotos.com/temp/mac2.mov

  4. #24

    Default

    Quote Originally Posted by tempest View Post
    BTW this is what the monitor is doing now: http://www.atariprotos.com/temp/mac2.mov
    Sorry it's not strictly Classic related; but I assume apple designed the video circuit with a lot of similarities....

    On the SE and SE/30 there is a diode (CR2 I think) and a power transistor (Q2) on the analogue board which are tied into the flyback control circuit. I've had two macs with failing diodes and one with a failing transistor which caused a twitch similar to one in your video.

    The other thing which causes some constant waves (not so much a twitch) is a bad 3.9uF non polar capacitor near the flyback transformer on the SE range. That was a little different to your video; but it is conceivable that it might be bad.

    Perhaps you can find the schematics for the Classic analogue board and see if you can find any parallels to these parts.
    System 80 Expansion Interface located! Thanks to all who helped out and the good people in the NZ vintage computer forums!

  5. #25

    Default

    Just took a look at a classic analogue board. There is a big diode, a MOSFET transistor on a heatsink plus a big green polyester capacitor all near the CRT yolk connector (near the top of the board, to the left of the flyback).

    I would start with these; and if it makes no difference the board probably needs all the electrolytics replaced.
    System 80 Expansion Interface located! Thanks to all who helped out and the good people in the NZ vintage computer forums!

  6. #26

    Default

    I’m having someone recap the AB for me.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •