16.011 How do I adjust Focus and Intensity on a blurry GS RGB Monitor?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
16.011 How do I adjust Focus and Intensity on a blurry GS RGB Monitor?
These adjustments may also help cure display "bowing", etc..
Intensity and Focus controls are on the High Votage Module (black module
near back of circuit board) inside the case.
Follow procedure outlined earlier for safety (e.g. unplug, wait, wear
goggles, ...) and removing the case.
Note the position of the two controls on the HV Module (at the left,
back). Mark the back of the cover where handy access hole should be. Take the
case cover to another area (i.e. away from the exposed CRT neck). Remove the
control assembly from the right side of the case.
Using a Dremel tool, hole saw, ... cut an approx. 1" diameter hole in the
back of the case. Use this opportunity to give the case interior a good
cleaning. (If you wash it, be very sure it's dry before continuing.)
Reinstall the control assembly.
Put everything back.
Reconnect cable and AC cord. Turn on the computer & monitor. Let it sit
10-20 minutes. Use the normal side of case controls to get the brightest,
'decent-focus' picture you can obtain.
Using a plastic TV technician's tool (and flashlight if necessary) adjust
the Intensity and Focus controls (through the hole in back) on the HV module to
get a good looking display.
Work back and forth between the back and side controls. What you're aiming
for is a display with good brightness and sharp focus when the side controls
are near their middle positions.
Cover the back hole using a piece of duct tape, a large sticker, etc..
(The opening is a potential shock hazard, especially if the monitor is within
reach of children.)
By: Rubywand
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