CPD-G520
SECTION 4
ADJUSTMENTS
•
Landing Rough Adjustment
1. Display all white pattern (or black dot pattern).
2. Set contrast to 255.
3. Display green plain pattern.
4. Side back DY and roughly adjust green plain pattern to be
centered on the useful screen with Purity Magnet.
5. Adjust DY tilt.
Note: Set ROTATION to 128 and LCC_NS to 128 when
adjusting DY tilt.
6. LIghtly tighten the DY screw.
•
Landing Fine Adjustment
Note: (1) After adjust W/B (9300k), measure the average of
IK with all white video input, while CONTRAST is
maximum and BRIGHTNESS is center. And
adjustment shall be made so that the miss-landing
become least after aging 2H with the IK 30% of
measured value shown above.
(2) The magnetic field shall be BH = 0.
(3) When adjusting at other than BH = 0, calculate the
shifted value from BH = 0.
1. Put the monitor in helmholz coil.
2. Set as follows;
LCC_SW = 0
(LCC Correction Current = 0)
FUNCTION_SW bit1 =
(Auto Degauss = On)
CONTRAST = 255
3. Display green plain pattern.
4. Degauss the iron part of chassis with a hand degausser and
degauss coil.
5. Degauss CRT face with a hand degausser again.
6. Input AC 230V to AC IN and turn the monitor off and on.
Then auto-degauss works.
7. Reset FUNCTION_SW bit1 to 0 (auto-degauss = off)
8. Degauss CRT face with a hand degausser again.
9. Attach wobbling coil to the specified place on CRT neck.
10. Put on landing sensor to CRT face.
11. Set LCC_SW to 12.
12. With landing checker, adjust DY position, purity, DY center
and landing of the 4 corners.
13. Read VX and VY value which are the read out of magnetic
sensor, and write to "LCC_VX_REF" and "LCC_VY_REF".
14. Adjust landing by LCC_NS, LCC_LT, LCC_LB, LCC_RT,
and LCC_RB. Adjustment of registers shall be limited
within the following range.
LCC_NS: 128 ± 15
LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40
Set LCC_SW to 13, and Perform Service Save.
17. Adjust top and bottom pins correction VR.
18. Adjust the horizontal trapezoid distortion by DY horizontal
trapezoid correction VR.
19. Check landing at each corner and in case not in specification,
adjust landing of 4 corners with "LCC_NS", "LCC_LT",
"LCC_LB", "LCC_RT", and "LCC_RB". The limitations of
registers are shown below.
LCC_NS: 128 ± 15
LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40
20. Remove the sensor and wobbling coil.
21. Switch signals to R, G, and B, and then check that the pure
colors have good color purity.
22. Fix purity magnets with white paint.
4-1
15. Tighten DY screw within specified torque, and auto-
degauss.
Note: Torque 22 ± 2 kgcm (2.2 ± 0.2Nm)
16. Adjust the vertical angle of DY to make top and bottom pins
equal (a = b). The horizontal angle shall not be changed
(straight). Settle DY upright without leaning, and insert
wedges firmly so that DY shall not move.
Note: 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.
± 6
± 6
± 6
± 6
± 6
± 6
± 6
± 6
± 6
(µm)
10
10
10
10
7
10
10
10
10
(µm)
The red and blue must be within
the specification given right with
respect to the green.
A difference between red and blue
must be within the specification
given right.
<Specifications>
Adjust so that the green is within
the specification given right.
4 corner adjust target : within ± 1
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
(µm)
a
b
c
d
<How to place wedge>
Green plain crosshatch pattern
a and b should be equal.
c and d should be equal.
Plaster RTV to both sides for the upper wedge.
Make sure that they settle inside DY.
Plaster RTV to one side for other wedges.
