Haier HTR21S34, Service Manual

12

8. PURITY / CONVERGENCE ADJUSTMENT 
 

 
PURITY ADJUSTMENT 

1.  Demagnetize CRT with the demagnetizer. 
 
2.  Loosen the retainer screw of the deflection yoke. 
 
3. Remove 

the 

wedges. 

 
4.  Input a green raster signal from the signal generator, 

and turn the screen to green raster. 

 
5.  Move the deflection yoke backward. 
 
6.  Bring the long lug of the purity magnets on the short 

lug and position them horizontally. (Fig2) 

 
7.  Adjust the gap between two lugs so that the GREEN 

RASTER will come into the centre of the screen. 
(Fig. 3) 

 
8.  Move the deflection yoke forward, and fix the position 

of the deflection yoke so that the whole screen will 
become green. 

 
9.  Insert the wedge to the top side of the deflection yoke 

so that it will not move. 

 
10.  Input a crosshatch signal. 

11.  Verify that the screen is horizontal. 
 

12. 

Input red and blue raster signals, and make sure that 
purity is properly adjusted.

CRT 

WEDGE         
     DEFLECTION YOKE 

P 
 
 
       
 

 
4  6 

P: PURITY MAGNET 
4: 4-POLES 

(convergence magnets) 

6: 6-POLES 

(convergence magnets) 

P/C MAGNETS

Fig. 1 

PURITY MAGNETS 

Long lug 
 
 
 
 
 
 
Short lug 

Bring the long lug over the short lug and 
position them horizontally. 

Fig. 2 

(FRONT VIEW) 
                                                                           

GREEN RASTER 

CENTER 

Fig. 3