Samsung CXJ1331/TUCX Service Manual

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Alignment and Adjustments (TV)4-6 Samsung Electronics4-2-5 CRT Gray Scale Adjustment1. Set the Color control to minimum.2. Adjust the Brightness and Contrast controlsfor a low light area.3. Adjust the Red, Green and Blue Bias controlsto obtain a gray raster of low brightness.4. Adjust the Brightness and Contrast controls tomaximum.5. Adjust the Blue Drive and Red Drive controlsfor a properly white-balanced picture in highlight areas.6. Repeat steps 2 through 5 for correct grayscale.4-2-6 Automatic DegaussingA degaussing coil is mounted around thepicture tube. External degaussing aftermoving the TV should be unnecessary, but thereceiver must be properly degaussed uponinstallation.The degaussing coil operates for about 1second after the power is switched ON. If theset is moved or turned in a different direction,the power should be OFF for at least 10minutes.If the chassis or parts of the cabinet becomemagnetized, poor color purity will result; ifthis condition occurs, use an externaldegaussing coil. Slowly move the degaussingcoil all around receiver, including its faceplate,picture tube, sides and front. Slowlywithdraw the coil to a distance of about 6 feetbefore turning the TV OFF or disconnecting itfrom the AC source.If color shading still persists, do the followingColor Purity and Convergence adjustments.4-2-7 Color Purity Adjustment1. If a magnetic-tape beam bender is mounted onthe neck of the picture tube, replace it with anadjustable-type (Magnet Assembly) prior tocenter-purity and center-convergenceadjustments. Consult the replacement partslist for the correct part number.2. Warm up the MVCR for 20 minutes, withBrightness set to maximum.3. Fully degauss the receiver. Use an externaldegaussing coil.4. Roughly adjust convergence.5. Input a black and white signal.6. Turn the low-light controls (Red and Blue)fully counterclockwise to obtain a green field.Adjust the Drive controls for a green field.7. Loosen the Deflection Yoke clamp screw, andmove the Deflection Yoke as close to thepurity magnet as possible.8. Loosen the purity magnet clamp. Adjust thepurity magnet to set a vertical green rasterprecisely at the center of the screen. Thentighten the clamp.9. Slowly move the Deflection Yoke forward, andadjust it for the best overall green screen.10. Tighten the Deflection Yoke clamp screw.11. Produce a blue and red raster. Turn the biascontrols fully clockwise. Ensure that goodpurity is obtained on each field.