Understanding Cathode Ray Tube Monitor Codes On
Its CRT Monitors Coating
All cathode ray tube monitor (crt)
have a sticker sticked on its crt coating. Those words or
characters printed on the sticker are the type number of the
picture tube. All cathode rays tubes, whether a monochrome (black
and white) or colour crt are identified by a specific code
consisting of numbers and letters. The cathode ray tube monitors
codes are different from each other because different picture tubes
have different characteristics. Television codes are more or less
the same as the monitor codes.
For instance, most
color monitor cathode ray tube has the designation code such as the
M36AFA63X03. There are six meaning (parts) M/36/AFA/63/X/03 in
these codes as explain below:
First Part:
Application
Computer Monitor crt start with
the letter "M” while for a TV crt tube, it start with
“A”.
Second Part: Screen diagonal
measure in centimeters (cm)
The “36” means the diagonal
viewing area measure is a minimum of 36cm which refers to 15 inches
picture tube, 41cm is 17 inches and so forth.
Third Part: Means Family
code
The 3 letters “AFA” designate a
family of crt that have similar physical and electrical
characteristic. These letters are assigned alphabetically beginning
with “AAA”, followed by “AAB”, “AAC” and so
on.
Fourth Part: Family
number
The number 63 means a specific
tube within the family code. A different number is assigned to crt
within the same family that have different neck diameters, for
example a single digit would be a monochrome crt, but this
two-digit number shows it is a color picture
tubes.
Fifth Part: The Phosphor
Type
The fifth code is the phosphor
designation. The letter X here corresponds to P22 for color crt.
Color monitor picture tubes can have any other single letter
(excluding I, O, or W) to designate other phosphor type for various
usage. For monochrome crt’s, the phosphor symbol is WW,
corresponding to P4. Monochrome monitor crt also can use “WW” or
some other two-letter combination (excluding I and
O).
Sixth Part: The Integral neck
components
The sixth code is assigned only
for crt having integral neck components specification, such as the
horizontal deflection yoke which connects to the horizontal
deflection circuit. The specifications are only applied to a
particular crt manufacturers. The primary consideration here is the
winding inductance value. The horizontal yoke coils have different
sensitivity such as deflection per Amp in both horizontal and
vertical.
Understanding the monitor cathode
ray tube type number may take you sometimes but if you begin to
experiment or observed the code for every crt
monitors or tv that comes in for repair, it wouldn’t take long for
you to grasp the meaning of the codes.
Be careful when
handling the picture tube, remember, safety have to come first.
Before you start to do the crt replacement, if possible wear a
goggle to protect your eyes just in case the tubes drop on the
floor.
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