GDM-4011P
SECTION 4
ADJUSTMENTS
•
Landing Rough Adjustment
1.
Enter the full white signal. (or the full black dots signal).
2.
Adjust the contrast to the maximum.
3.
Make the screen monogreen.
4.
Adjust the brightness is easy to see with the G2 resistor.
5.
Reverse the DY, and adjust coarsely the purity magnet so
that a green raster positions in the center of screen.
6.
Moving the DY forward, adjust so that an entire screen be-
comes monogreen.
7.
Adjust the tilt of DY, and fix lightly with a clamp.
•
Landing Fine Adjustment
1.
Put the set inside the Helmholtz coil.
2.
Input the single green signal and set the CONT control to
MAX.
Note: Set to
Σ
1k=200 µA with the signal green signal, and after
aging for about 30 minutes, adjust so that it is exactly this
value.
3.
Demagnetize the metal part of the chassis with the hand de-
gausser and coil degausser, and the CRT surface with the
hand degausser.
Input AC 230V to AC IN, turn on and off the power to per-
form auto degaussing. (Perform auto degaussing by setting
“MONCONREG2”=152. Return to the original value after
use.)
Demagnetize the CRT surface with the hand degausser
again.
Note:
(1) Adjust in s non-magnetic field. BV=45uT.
(2) 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.
6.
Adjust the DY position and purity, and the DY tilt, and land-
ing of the center and 4 corners with the landing checker.
<Specification>
Adjust the green of corners 1 to 4, and center 6 to ±5 µm, and red
and blue to within ±7 µm of green, and the difference between
red and blue to within ±10 µm.
Adjust the green of 5 and 7 to within ±10 µm, and red and blue to
within ±7 µm of green, and the difference between red and blue
to within ±10 µm.
(Set each corner to 1st frame of the crosshatch.)
7.
For the up/down and left/right swing, swing the DY and in-
sert a wedge so that the up and down pins are equal at the top
and bottom and the horizontal trapezoid is equal at the left
and right. Insert the wedge firmly so that the DY does not
shake.
8.
Check the landing of each corner, and if they do not satisfy
the specification, paste a Disk-Mg onto the funnel and ad-
just.
Note:
(1) Do not paste more than 2 magnets to one corner.
(2) Paste within 80 to 100 mm from the DY on the diagonal line
of the magnet.
(3) If using the magnet, be sure to demagnetize with the hand
degausser and check.
9.
Remove the sensor and wobbling coil.
10. Switch the signal to R.G.B., and check that each color is
pure.
11. Check that the DY is not tilting, and fix the purity Mg with a
white pen.
1
2
4
3
6
7
5
4-1
