Hitachi C28W440N, Service Manual

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Cinema mode for 16: 9 CRTs Subtitle mode for 16: 9 CRTs
Zoom mode for 16: 9 CRTs
4:3 VERTICAL ZOOM ADJUSTMENT:
ADJUST 10 = Vertical Zoom
Enter a PAL B/G circle test pattern via RF. Change vertical zoom till you see the upper and lower limit of the
circle as close to the upper and lower limit of the picture tube as possible.
4:3 VERTICAL SCROLL ADJUSTMENT:
ADJUST 11 = Vertical Scroll
Enter a PAL B/G circle test pattern via RF. Change vertical scroll till you see the circle exactly in the middle of the
screen.
4:3 HORIZONTAL SHIFT ADJUSTM ENT:
ADJUST 12
= 4 : 3 Horizontal Shift
Enter a RED PURITY test pattern via RF. Change horizontal shift till the picture is horizontally centred. Check
whether this adjustment is correct after completing Service Mode Adjustment.
4:3 VERTICAL SLOPE ADJUSTMENT:
ADJUST 13
= 4 : 3 Vertical Slope
Enter a CROSS-HATCH B/G test pattern via RF. Change vertical slope 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 VERTICAL SLOPE item if the adjustment becomes improper after some other geometric adjustments
are done.
4:3 VERTICAL AMPLITUDE ADJUSTMENT:
ADJUST 14 = 4 : 3 Vertical Amplitude
Enter a PAL B/G test pattern via RF. Change vertical slope till horizontal black lines on both the upper and lower
part of the test pattern become very close to the upper and lower horizontal sides of picture tube and nearly about
to disappear. Check and readjust VERTICAL AMPLITUDE item if the adjustment becomes improper after some
other geometric adjustments are done.