Panasonic TC-21FX30LA, Service Manual

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TC-21FX30LA/LP / TC-29FX30LA/LP
WHITE QUALITY CALIBRATION
PREPARATION:
1. Adjust the HELMHOLTZ device to local magnetic field. Ho-
rizontal: 0 ± 0.003 x 10 -4 T
2. Receive a white purity pattern.
3. Adjust CONTRAST and BRIGHT controls to maximum.
4. Previously adjust the CONVERGENCE.
5. Fully degauss the CRT by using an external degaussing
coil.
CALIBRATION:
1. Adjust the magnetic field in 0.4x10-4T (400 mG), and
check the white quality with the CRT turned to EAST and
to WEST.
2. Receive a red pattern, adjust the COLOR control to
maximum and confirm the purity adjustment.
3. If purity error is found at the CRT corners, apply magnetic
tapes to correct it, fully degauss the CRT again and repeat
the steps 1 and 2. Don't use this magnetic tapes on the
internal side of the yoke.
4. When magnetic tapes be used, fully degauss the face of
CRT (in a horizontal magnetic field = 0 ± 0.03x10-4T),
and repeat the items 1 and 2.
5. Adjust the control of COLOR to MINIMUM, and repeating
the item 1.
CRT CUT OFF VOLTAGE ADJUST
Important: Use proof tip x100 in the CRT cathode.
1. Connect the proof tip in the “G” cathode (“L” P.C.B.).
2. Supply a WINDOW pattern signal.
3. Select picture menu: DYNAMIC NORMAL
4. Adjust SUB-BRIGHTNESS in 0 (zero).
CALIBRATION :
1. Set CUT OFF data as below:
2. Adjust the screen trimpot to obtain in the “G” cathode the
voltage (* V) es below (fig.1).
Fig. 1
Model (CRT) 21” 29”
R,G,B CUT OFF 242 135
Model (CRT) 21” 29”
*V 150 180
*V
WHITE BALANCE CALIBRATION
1. Adjust the HELMHOLTZ device to local magnetic field.
2. Let the set warm up for a minimum of 30 minutes.
3. Receive a white balance. (This sign should contain
burst sign).
4. Adjust the IMAGE menu to DINÂMIC NORMAL.
5. Fully degauss the CRT by using an external degaussing
coil.
6. Position the color analyzer in contact with the CRT face.
7. Access the SERVICE MODE 1
CALIBRATION:
A) LOW LIGHT CALIBRATION
1. Adjust S-BRT, so that Y = 7
2. Adjust B-CUT OFF, so that x = 0,247 ±0.01
3. Adjust R-CUT OFF, so that y = 0,273 ±0.01
B) HIGH LIGHT CALIBRATION
1. Adjust S-BRT, so that Y = 150
2. Adjust B-DRIVE, so that x = 0,261 ±0.01
3. Adjust R-DRIVE, so that y = 0,267 ±0.01
C) Repeat the procedures A and B.
Note 1 : When adjusting white balance the keys 8 and 9
of the remote control can be used to adjust sub-
bright.
Note 2 : Press OK after adjusting white balances to
memorize the data.
Assure that not entering light for the meter borders and that the CUT OFF voltage calibration has been done. If the value in the
color analyzer is below 150, adjust CONTRAST to 50.
ADJUSTMENTS
ITEM / PREPARATION PROCEDURE