Sharp 37DT Service Manual page 11

• GEOMETRY ADJUSTMENT PROCEDURE
1 . H-SHFT
a) Receive Philips pattern signal.
b) When </\ button is pressed, picture moves to the left.
c) When <V button is pressed, picture moves to the right.
d) Adjust the horizontal location to obtain picture centering (fig. 1 )
2. V-SHFT
a) Receive Philips pattern signal.
b) When </\ button is pressed, picture moves up.
c) When <V button is pressed, picture moves down.
d) Adjust the horizontal location to obtain picture centering (fig. 2)
3. V-AMPL
a) Recive Philips pattern signal.
b) When </\ button is pressed, vertical size of picture increases.
c) When <V button is pressed, vertical size of picture decreases.
d) Adjust the vertical size to obtain overscan (fig. 3).
4. V-SLOP
a) Receive Philips pattern signal.
b) When </\ button is pressed, upper picture scanning decreases and
. lower picture scanning increases.
c) When <V button is pressed, upper picture scanning increases and
lower picture scanning decreases.
d) Adjust the vertical symmetry to obtain symmetrical scanning between
upper and lower picture (fig. 4).
COLOUR ADJUSTMENT
5. V-DLY
a) Receive Philips pattern signal.
b) When button is pressed, luma phase delays.
c) When button is pressed, chroma phase delays.
d) Adjust the chroma-luma delay.
The following adjustments are only required when the Picture Tube is changed.
6. "GAIN R", "GAIN G", "GAIN B".
a) Adjust G2.
b) Tune in white card.
c) Adjust colour to minimum.
d) Position colourmeter in the center of screen.
e) Using brightness and contrast buttons, select a luminance of 120 nits.
f) Operate again in Service Mode and select location GAIN R, GAIR B to obtain colour coordinates:
X= 0.290 ±0.015
Y= 0.284 ±0.015
g) Exit Service Mode and check colour coordinates 'X' and 'Y' at 20 and 120 NITS. It may be necessary to repeat
procedure.
NOTE:
Locations: GAIN R alter 'X' coordinate; GAIN G alter the 'Y' coordinates; GAIN B alter the 'X' and "/'coordinates.