Sharp 21ES251E Service Manual page 11

HORIZONTAL ,VERTICAL,DEFLECTION LOOP ADJUSTMENT (2)
NO
ADJUSTMENT POINT
8 UPPER CORNER (1) Receive CrossHatch Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V38
(3) Adjust the 2nd upper vertical line from the right end of the crosshatch pattern
so that the upper line are straight.
(4) Make sure both left / right of 2nd vertical line at optimum point
9 LOWER CORNER (1) Receive CrossHatch Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V40
(3) Adjust the 2nd lower vertical line from the right end of the crosshatch pattern
so that the bottom line are straight.
(4) Make sure both left / right of 2nd vertical line at optimum point
10 BOW-ADJ (1) Receive CrossHatch Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V44 BOW ADJ
(3) Adjust the 2nd vertical line from the end of the crosshatch pattern until line is straight
11 ANGLE ADJ (1) Receive CrossHatch Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V42
(3) Adjust the 2nd vertical line from the end of the crosshatch pattern line is straight
(4) Make sure both left / right of 2nd vertical line at optimum point
12 TRAPEZIUM (1) Receive CrossHatch Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V34
(3) Adjust the 2nd vertical line from the right end of the crosshatch pattern
so that the D1 (center area of the second vertical line - edge of screen)
and D2 (top area of the second vertical line - edge of screen) are same.
(4) Make sure both left / right of 2nd vertical line at optimum point
13 FINAL INSPECTION OF (1) Receive CrossHatch Pattern Signal (PAL 50Hz).
ADJUSTMENT (2) Please make sure picture distortion (overall picture quality) must be balance at
optimum point TOP / BOTTOM at LEFT / RIGHT corner.
(3) If NG, please RE-ADJUST follow step 7 to 13 or adjust at NG position to get best
picture quality
ADJUSTMENT CONDITION / PROCEDURE
A1
B1
C1
OVERALL PICTURE QUALITY MUST
BE BALANCE AT OPTIMUM POINT (
LEFT & RIGHT )
11
WAVEFORM OR OTHERS
H-BOW
D2
D1
A2
D1
A1 A2
~ ~
~ ~
A1 B1 B2
~ ~
C1 C2
B2
D1 = D2
D2
C2
D2
D1