37GT-25. version 00 - Sharp TV Service Manual (repair manual). Page 9

1. HOR  POS
a) Receive Philips pattern signal.
b) When 

  

∧

 button is pressed, picture moves to the left.

c) When 

∨

 

 

 button is pressed, picture moves to the right.

d) Adjust the horizontal location to obtain picture centering (Fig.1).

•GEOMETRY ADJUSTMENT PROCEDURE

2. VERT POS
a) Receive Philips pattern signal.
b) When 

  

∧

 button is pressed, picture moves up.

c) When 

∨

 

 

 button is pressed, picture moves down.

d) Adjust the vertical location to obtain picture centering (Fig.2).

3. VERT AM
a) Receive Philips pattern signal.
b) When 

  

∧

 button is pressed, vertical size of picture increases.

c) When 

∨

 

 

 button is pressed, vertical size of picture decreases.

d) Adjust the vertical size to obtain picture overscan (Fig.3).

Fig. 2

Fig. 1

Fig. 4

Fig. 3

•COLOUR  ADJUSTMENT  PROCEDURES

2. «B-GAIN», «G-GAIN», «R-GAIN»
a) Adjust G2.
b) Tune a white pattern
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 R-GAIN and B-GAIN
   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 the same procedure or re-adjust the cuts as show the be below one.

NOTE: Locations «R» alter «X» coordinates; «G» alter «Y» coordinates; «B» alter «X» and «Y» coordinates.

1. Y-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.

a) Receive Philips pattern signal.

b) When 

  

∧

 button is pressed, upper picture scanning decreases and

    lower picture scanning increases.

    

     c) When 

  

∨

 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).