User`s guide

What part should I get?
The transistor is part Q502 on the PCB of the Applecolor RGB monitor,
manufactured in 1987. This is the only power transistor in the HV section, the
only one which is on a heat sink. ...."
D1650 is a 2SD1650 which crosses to an ECG2331. You should be able to pick
one up at your local electronics shop. Try MCM Electronics, Dalbani, etc..
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From: Rubywand
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.
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014- Suddenly my GS monitor exhibits a serious case of
display shimmy which sometimes degenerates into jagged
lines. How can I fix this problem?
Side-to-side shimmy indicates that Horizontal lock is not stable.
A good fix try is to adjust Horizontal Hold (the "<- ->" knob/stub) until
the shimmy stops. This usually works unless 1- The HH control is already at its
extreme setting, 2- The HH control has 'dirty' or burn spots at the position
which would, ordinarily, be the correct setting, 3- The display stabilizes but
ends up moved too far to the left or right side of the screen.