Panasonic TC-21FX30LA Service Manual

Panasonic TC-21FX30LA Service Manual Manual pdf 25 page image

- 25 -TC-21FX30LA/LP / TC-29FX30LA/LPCRT21”29”[*A]10μm ±50μm ±5ADJUSTMENTSFig. 11 2 3 3 2 1Fig. 29- FOCUS CALIBRATION• Assure that the SUB-BRIGHTNESS adjustment has beendone.1. Supply a Philips or monoscope pattern signal.2. Adjust IMAGE MENU to DYNAMIC NORMAL.CALIBRATION:1. Adjust the FOCUS variable resistor for the point of betteradjustment.• with PHILIPS signal .... take as reference for adjustmentthe third vertical line (fig. 1).• with MONOSCOPE signal in the number 4 (fig.2).8- SUB-BRIGHT AND SUB-CONTRASTCALIBRATION1. Supply a WINDOW pattern signal.2. Adjust IMAGE MENU to DYNAMIC NORMALSUB-BRIGHT CALIBRATION1. Position the color analyzer in the LOW LIGHT imagearea.2. Ajust S-BRT control, so that it is Y=0,7±0,2.SUB-CONTRAST CALIBRATION1. Position the color analyzer in the HIGH LIGHT imagearea.2. Ajust S-CONT DAC control, so that it isY=230±10 for 20” CRT and Y=380±20 for 14” CRT.3. If impossible to obtain that adjustment, adjust SUB-CONT again.4. Check the SUB-BRIGHT adjust.10- PURITY CALIBRATION1. Adjust the HELMHOLTZ device for the local magnetic field(HORIZONTAL: 0 ± 0.03 X 10-4T)2. Let the set warm up (aging time) for a minimum of 60minutes.3. Supply a purity pattern (white pattern).4. Adjust CONTRAST and BRIGHT to MAXIMUM.5. The static convergence adjustment must have beenmade preliminarily.6. Connect a DC ampere meter between FBT pin11 (-) andFBT pin3 (+), and adjust to 920μA±10%, varying the S-BRT DAC control.CALIBRATION:1. Position the “ears” of the purity magnets both upward.2. Adjust the purity until the markers in the purity jigmonitorscope becomes symmetrical in the horizontaldirection.3. The vertical centralization correction is made throughthe purity magnets for stripe CRT type only.4. Slide the yoke forward by 10 mm±5 in the monitor. Then,tighten the deflection yoke.5. Repeat the procedures 2 ~ 3 ~ 4.6. Press the belt of deflection yoke.7. Adjust “beam landing” using a microscope. (for modelchange or instrument check only)4ITEM / PREPARATION PROCEDURE