Hitachi C28W440N, Service Manual

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4:3 S-CORRECTION ADJUSTMENT:
ADJUST 15
= 4 : 3 S-Correction
Enter a PAL B/G circle test pattern via RF. Change S-correction till the middle part of the circle is as round as
possible.
4:3 VERTICAL SHIFT ADJUSTMENT:
ADJUST 16
= 4 : 3 Vertical Shift
Enter a PAL B/G test pattern via RF. Change Vertical Shift till the test pattern is vertically centred, i.e. horizontal
line at the centre pattern is in equal distance both to upper and lower side of the picture tube. Check and readjust
Vertical Shift item if the adjustment becomes improper after some other geometric adjustments are done.
4:3 EW WIDTH ADJUSTMENT (only for 110° picture tubes):
ADJUST 17
= 4 : 3 EW Width
Enter a PAL B/G test pattern via RF. Change EW Width till the vertical black and white bars on both left and right
side of the pattern exactly disappear.
4:3 EW PARABOLA WIDTH ADJUSTMENT (only for 110° picture tubes):
ADJUST 18 = 4 : 3 EW Parabola Width
Enter a PAL B/G test pattern via RF. Change EW Parabola Width till vertical lines close to the both sides of the
picture frame become parallel to vertical sides of picture tube. Check and readjust EW Parabola Width item if the
adjustment becomes improper after some other geometric adjustments are done.
4:3 EW UPPER CORNER PARABOLA ADJUSTMENT (only for 110° picture tubes):
ADJUST 19 = 4 : 3 EW Corner Parabola
Enter a PAL B/G test pattern via RF. Change EW Upper Corner Parabola till vertical lines at the corners of both
sides of picture frame become vertical and parallel to vertical corner sides of picture tube. Check and readjust EW
Upper Corner Parabola item if the adjustment becomes improper after some other geometric adjustments are done.
4:3 EW TRAPEZIUM ADJUSTMENT:
ADJUST 20 = 4 : 3 EW Trapezium
Enter a PAL B/G test pattern via RF. Change EW Trapezium 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 EW
Trapezium item if the adjustment becomes improper after some other geometric adjustments are done.
4:3 HORIZONTAL PARALLELOGRAM:
ADJUST 21 = Horizontal Parallelogram
Enter a PAL B/G test pattern via RF. Change Horizontal Parallelogram to set vertical lines orthogonal to the
horizontal lines Check and readjust Horizontal Parallelogram item if the adjustment becomes improper after some
other geometric adjustments are done.
4:3 BOW:
ADJUST 22 = Bow
Enter a PAL B/G test pattern via RF. Change Bow to straighten the vertical lines. Check and readjust Bow item if
the adjustment becomes improper after some other geometric adjustments are done.
4:3 EW LOWER CORNER PARABOLA ADJUSTMENT (only for 110° picture tubes):
ADJUST 23 = 4 : 3 EW Lower Corner Parabola
Enter a PAL B/G test pattern via RF. Change EW Lower Corner Parabola till vertical lines at the corners of both
sides of picture frame become vertical and parallel to vertical corner sides of picture tube. Check and readjust EW
Lower Corner Parabola item if the adjustment becomes improper after some other geometric adjustments are done.
The adjustments and their functions and the procedures are the same for 16:9, Cinema,
Subtitle and Zoom modes. The resultant geometry of the pictures must be like the
pictures shown above. The adjustment numbers are given above as a list “ Adjustment
List”.
OSD POSITION:
ADJUST 80 = OSD POSITION
The vertical position of the OSD can be set.
TILT ADJUSTMENT:
ADJUST 81 = TILT ADJUSTMENT