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16.013 How can I fix sporatic Shrinking and Flicking in-out of Focus?




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This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.

16.013 How can I fix sporatic Shrinking and Flicking in-out of Focus?

         Arcing from the metal brace to the HV module can cause the display to
momentarily shrink and flick out of focus.

     Follow safety and setup procedures outlined earlier.

     The cure is to bend the brace up enough to increase the arc path and clean
the surfaces involved. Apply HV dope to the brace and module where distances
are small.

     If the case interior seems pretty clogged with dust and gunk, it's a good
idea to remove the side-mounted Controls/Switch (C/S) Module and give the case
a good washing. (Be very sure it is well dried before replacing.) You should
also clean the two controls on the C/S Module with spray-in Control Cleaner.

     Before putting the case back, this may be a good time to adjust base
Intensity and Focus (the two nub controls on the HV module).  Position the
monitor so that screen is easy to see and the nub controls are accessible.

     Plug in the the C/S Module. Adjust the C/S Module controls to center
positions. Plug in the monitor to the computer. Get a Desktop display with some
text and icons. Use an insulated tool to adjust the nub Intensity and Focus
controls for maximum sharpness at 'normal' viewing intensity. A magnifying
glass is helpful to obtain max pixel sharpness.

By:  Rubywand

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previous page: 16.012 I need to replace the High Voltage "flyback" power transistor in my Applecolor monitor. The part bears no manufacturer's mark, just two lines of text:
  
page up: Apple II Csa2 FAQs
  
next page: 16.014 Suddenly my GS monitor exhibits a serious case of display shimmy which sometimes degenerates into jagged lines. How can I fix this problem?