VESTEL 11AK18
Service Manual

4) H-SIZE - Adjust H-WIDTH item by pressing cursor-left and/or cursor-right buttons till no under-scan condition will happen, i.e. no white bars on the left and right side of the test pattern will be visible nor the picture will be so wide. Check and readjust H WIDTH item if the adjustment becomes improper after some other geometric adjustments are done. 5) S-COR - Press cursor-left and/or cursor-right buttons till the size of squares on both the upper and lower part of test pattern become equal to the squares laying on the vertical centre of the test pattern. Check and readjust S-COR item if the adjustment becomes improper after some other geometric adjustments are done. 6) LINRT - Press cursor-left and/or cursor-right buttons till all the size of squares of the test pattern become in equal size from the top of the screen to its bottom of the whole screen. Check and readjust LINRT item if the adjustment becomes improper after some other geometric adjustments (especially after than S-COR adjustment are done. 7) ANGLE - Press cursor-left and/or cursor-right buttons till the vertical lines of the crosshatch pattern become completely perpendicular to horizontal lines without any angle of vertical deviation. Check and readjust ANGLE item if the adjustment becomes improper after some other geometric adjustments are done. 8) BOW - Press cursor-left and/or cursor-right buttons till the vertical lines especially ones close to the left and right sides will of equal and symmetrical bending, i.e. they together will neither be towards left side nor right side. Check and readjust BOW item if the adjustment becomes improper after some other geometric adjustments are done. 9) TRPEZ - Press cursor-left and/or cursor-right buttons till vertical lines, especially lines at the sides of the picture frame became parallel to the both sides of picture tube as close as possible. Check and readjust TRPEZ item if the adjustment becomes improper after some other geometric adjustments are done. 10) PARAB - Press cursor-left and/or cursor-right buttons till vertical lines close to the both sides of the picture frame become parallel to vertical sides of picture tube without any bending to left or to right side of the screen.. Check and readjust PARAB item if the adjustment becomes improper after some other geometric adjustments are done. 11) U. COR - Press cursor-left and/or cursor-right buttons till vertical lines at the upper corners of the picture frame become vertical and parallel to vertical corner sides of picture tube. Check and readjust U. COR item if the adjustment becomes improper after some other geometric adjustments are done. 12) L. COR - Press cursor-left and/or cursor-right buttons till vertical lines at the lower corners of the picture frame become vertical and parallel to vertical corner sides of picture tube. Check and readjust L. COR item if the adjustment becomes improper after some other geometric adjustments are done.

C) VIDEO ALIGNMENTS

- Switch the program to crosshatch test pattern (C2 in internal transmission system) for geometric adjustments - Switch the program to colour bar test pattern (S37 in internal transmission system) for video adjustments - Press GREEN key to access this group of item - Select the items by pressing cursor-up and/or cursor-down keys. - Adjust the item by pressing cursor-left and/or cursor-right after selecting that item. - Store the settings by pressing OK key - Switch to another item group by pressing the colour keys of the related coloured headline of that group - Exit production mode by pressing the MENU key on the remote transmitter.

1) RGn, GGn, BGn: WHITE BALANCE ADJUSTMENT - Apply WHITE test pattern via RF (C21 in internal transmission system) Adjust all analogue functions to medium level Use Colour analyser (Philips PM5639) Monitor the colour temperature (X, Y) on colour analyser. Set GGn at value 32 (constant). Select RGn and BGn by cursor-up and/or cursor-down buttons and change the values by cursor-left and/or cursor-right buttons till the following values are read: X=285±10 Y=293±10 on the colour analyser.
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