Panasonic TC-21FX30LA Service Manual

Panasonic TC-21FX30LA Service Manual Manual pdf 26 page image

- 26 -TC-21FX30LA/LP / TC-29FX30LA/LPWHITE QUALITY CALIBRATIONPREPARATION:1. Adjust the HELMHOLTZ device to local magnetic field. Ho-rizontal: 0 ± 0.003 x 10-4 T2. 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 degaussingcoil.CALIBRATION:1. Adjust the magnetic field in 0.4x10-4T (400 mG), andcheck the white quality with the CRT turned to EAST andto WEST.2. Receive a red pattern, adjust the COLOR control tomaximum and confirm the purity adjustment.3. If purity error is found at the CRT corners, apply magnetictapes to correct it, fully degauss the CRT again and repeatthe steps 1 and 2. Don't use this magnetic tapes on theinternal side of the yoke.4. When magnetic tapes be used, fully degauss the face ofCRT (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 repeatingthe item 1.CRT CUT OFF VOLTAGE ADJUSTImportant: 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 NORMAL4. 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 thevoltage (* V) es below (fig.1).Fig. 1Model (CRT) 21” 29”R,G,B CUT OFF 242 135Model (CRT) 21” 29”*V 150 180*VWHITE BALANCE CALIBRATION1. 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 containburst sign).4. Adjust the IMAGE menu to DINÂMIC NORMAL.5. Fully degauss the CRT by using an external degaussingcoil.6. Position the color analyzer in contact with the CRT face.7. Access the SERVICE MODE 1CALIBRATION:A) LOW LIGHT CALIBRATION1. Adjust S-BRT, so that Y = 72. Adjust B-CUT OFF, so that x = 0,247 ±0.013. Adjust R-CUT OFF, so that y = 0,273 ±0.01B) HIGH LIGHT CALIBRATION1. Adjust S-BRT, so that Y = 1502. Adjust B-DRIVE, so that x = 0,261 ±0.013. Adjust R-DRIVE, so that y = 0,267 ±0.01C) Repeat the procedures A and B.Note1: When adjusting white balance the keys 8 and 9of the remote control can be used to adjust sub-bright.Note2: Press OK after adjusting white balances tomemorize 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 thecolor analyzer is below 150, adjust CONTRAST to 50.ADJUSTMENTSITEM / PREPARATION PROCEDURE