Section 3 Adjustments - HP N.hemisphere GDM-FW9012 Service Manual

ote: Hand degauss must be used on stand-by or power-off condition.
This model has an automatic earth magnetism correction function by using an earth magnetism sensor and a LCC coil. When
using a hand degauss while monitor (LCC coil) is being operated, it sometimes gets magnetized, and the system may not
work properly as a result.
Landing Rough Adjustment
Enter the full white signal. (or the full black dots signal).
Adjust the contrast to the maximum.
Make the screen monogreen.
ote: Off the outputs from R ch and B ch of SG.
Reverse the DY, and adjust coarsely the purity magnet so that
a green raster positions in the center of screen.
Adjust the tilt of DY, and fix lightly with a clamp.
ote: "TILT" = "128".
Landing Fine Adjustment
Put the set inside the Helmholtz coil. ("LCC SW" = "12")
Input the single green signal and set the "CONTRAST" =
"255".
ote: After the W/B adjustment with 9300K, measure an average
of ΣIk when a full white signal is entered in the CONT
MAX/BRT CENT status. Then make adjustment so that the
specified screen can be attained after aging for 2 hours with
Ik equivalent to 30% of the average value.
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SECTION 3
ADJUSTMENTS
3. Demagnetize the metal part of the chassis with the hand degausser and coil
degausser, and the CRT surface with the hand degausser.
Input AC 230V to AC IN, turn on and off the power to perform auto
degaussing. (Perform auto degaussing by setting "FUNCTION SW" = 1.
Return to the original value after use.)
Demagnetize the CRT surface with the hand degausser again.
Note:
(1) Hand degauss must be used on stand-by or power-off condition.
This model has an automatic earth magnetism correction function by using
an earth magnetism sensor and a LCC coil. When using a hand degauss while
monitor (LCC coil) is being operated, it sometimes gets magnetized, and the
system may not work properly as a result.
(2) Adjust in a non-magnetic field.
(3) If adjusting in a magnetic fields, add the shift from the non-magnetic field in
your estimation.
4. Attach the wobbling coil to the designated part of the CRT neck.
5. Attach the sensor of the landing adjustment unit on the CRT surface.
GDM-FW9012(E) 3-1