Panasonic TC-14A12P Service Manual

Contents

Panasonic TC-14A12P Service Manual Manual pdf 24 page image

- 24 -TC-14A12P / TC-20B12Service Adjustments and CalibrationsCOLOR PURITY ADJUSTMENT1. Position the CRT face turned to east or west.2. Set Bright and Contrast controls to their maximum positions.3. Leave the set heating up for 60 minutes at white screen.4. Fully degauss the picture tube by using an external degauss coil.5. Apply a red pattern.6. Loose a clamp screw for the deflection yoke and move it forwardor backward until a uniform red screen is obtained.7. Adjust rougly the Low Light controls and make sure that a uniformwhite field is obtained.8. Tighten the clamp screw.Uniform red screenCONVERGENCE CALIBRATION1. Receive a crosshatch pattern and set Contrast control to themaximum position.2. Adjust Bright control to obtain a clear pattern.3. Remove the DY wedges and slightly tilt the deflection yoke tothe vertically and horizontally to obtain the good overallconvergence.4. Fix the deflection yoke by reinserting the DY wedges as showedbelow.5. If purity error is found, repeat “Color Purity” adjustmentNotes:• Wedge A showed above should be fixed within a range of 45° tothe left of the vertical line shown.• After inserting wedge A, insert wedges B, C and D. The wedgesshould be set 90° apart from each other.• Be certain that the four wedges are firmly fixed and the DeflectionYoke is tightly clamped in place.Otherwise the Deflection Yoke may shift its position and cause aloss of convercence and purity.VerticalHorizontalBGRRGBBGRRGBCRTScrew for deflection yokeDeflection yokeBACKWAD FORWARD‡ ‡  