Panasonic TX-29P180T Service Manual

Panasonic TX-29P180T Service Manual Manual pdf 16 page image

5.9. CUT OFFPreparation1. Receive a colour bar signal with colour “OFF” and operatethe TV set more than 15 minutes.2. Set the picture menu to “DYNAMIC NORMAL” and the AI tooff.3. Connect an oscilloscope to TPL7 with DC mode.4. Set the TV set to Service Mode 1.5. Screen VR: Min.6. Set the data level of SUB BRIGHT, R, G, B-CUTOFF andR, G, B-DRIVE to the table values.Display Data LevelR High (R-CUT OFF) 256G High (G-CUT OFF) 512B High (B-CUT OFF) 256R Low (R-DRIVE) 128G Low (G-DRIVE) 128B Low (B-DRIVE) 128SUB BRIGHT 136Adjustment1. Select G-CUTOFF adjustment mode and collapse verticalscan.2. Adjust G-CUTOFF control to become the DC = 0V to videolevel at 180V as shown below.3. Slowly turn the screen control clockwise until a green colourhorizontal line appears on the picture tube. This is thesetting point for the screen control.Note that do not adjust the G-CUTOFF setting in thefollowing procedure.4. Adjust the remained R and B-CUTOFF controls so as to geta white horizontal line on the screen.5. Return to full field SCAN by pushing the position 5 key onthe remote control.6. Adjust the R-Drive and B-Drive controls as to obtain uniformwhite on the white bar of the greyscale pattern.7. Confirm correct B/W rendition and greyscale tracking orrepeat CUTOFF and drive control setup.Note:Write down the original value for each addressadjusment before adjusting anything.8. Wedge A shown in Fig. 1 should be fixed within a range of45° to the left of the vertical line as shown.9. After inserting wedge A, insert wedges B, C and D.The wedges should be set 90° apart from each other.10. Be certain that the four wedges are firmly fixed and thedeflection yoke is tightly clamped in place otherwise thedeflection yoke may shift its position and cause a loss ofconvergence and purity.16TX-29P180T