User`s guide

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006- What tools and solder should I use for repairs?
For any soldering use a good quality pencil-style iron rated at 25-40 watts
with a holder and sponge. Use high quality (60/40 tin/lead or better) rosin core
solder (e.g. Kester "44" 20 gauge).
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007- How do fix a Flickering, Jumping, display which
sometimes collapses to a line?
If the monitor exhibits major flickering, periodic collapse of the display
to a line, etc., then it may help to know that a common source of such problems
is one or more bad connections where the High Voltage module is joined to the
main circuit board. (This module is the black thing with a HV lead running to
the CRT-- it's near the left, back. The slotted nub controls in its case set
Focus and base Intensity.) Often these connections look okay because it is hard
to see the small fractures in the so
lder surrounding the pins.
The cure is to resolder all of the pins coming from the module (on the
under-side of the circuit board). Before doing the soldering, clip a wire to
the metal chassis and touch the other end to each HV module pin and other points
in the area. While soldering, avoid touching anything conductive on the monitor
with anything but the iron and solder.
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008- Suddenly my monitor has an all-blue (all-red, etc.)
screen! How do I fix this?
You probably have a blown choke on the little chroma board mounted to the
back of the CRT. The choke will be connected to one of the larger, R/G/B output
transistors. Use an Ohmmeter to find the open choke. Replace the bad choke with
'one like it' or brew your own: wind about 25-30 turns of #30 wire on a small
ferrite core.
A more detailed procedure is presented below ....
1. The part that causes the problem when it fails is a "choke" or "inductor" ,
it is mounted on a small circuit board attached to the back of the monitor tube
itself. This part looks like a small blue ceramic ball with two leads coming out
the bottom, and is color coded for 10 microhenries.
2. There are three of these items on that circuit board, and if any one of them
fails, the symptom is a screen all of one color, with total loss of any controls
of the monitor. The parts are identified by number, and what color the screen is
will tell you which one to replace.
L6R2 for a Red screen
L6G2 for a Green screen