Hitachi 61HDX98B Manual page 69

B E A M F O R M A D J U S T M E N T for the DP-8 5 C H A S SIS
BE A M F O R M
Preparation for adjustment
1) IMPORTANT: Screen for-
mat should be "NOR M AL".
2 ) T h e b e a m a l i g n m e n t s h o u l d
h a v e b e e n c o m p l e t e d .
2 ) T h e Y o k e T i l t , c e n t e r i n g ,
h o r i z o n t a l / v e r t i c a l a m p l i t u d e
a n d o p t i c a l f o c u s a d j u s t-
m e n t s s h o u l d h a v e b e e n
c o m p l e t e d .
3 ) B r i g h t n e s s : 9 0 % , C o n t r a s t :
M a x . .
4 ) Input a N T S C D O T s i g n a l .
BEAM ALIGNMENT AND FORM MAGNETS
PICTURE TUBE SIDE
Adjustments procedure:
1 ) G r e e n C R T b e a m s h a p e a d-
just m e n t .
2 ) S h o r t- c i r c u i t 2 P s u b- m i n i
c o n n e c t o r s o n R e d a n d B l u e
C R T P W B t o p r o j e c t o n l y
t h e G r e e n b e a m .
3 ) T u r n t h e g r e e n s t a t i c f o c u s
V R f u l l y c l o c k w i s e .
ADJUSTMENT
TABS
4-POLE BEAM SHAPE
CORRECTION MAGNET
ZERO FIELD SPACER
(NO ADJUSTMENT)
2-POLE BEAM
ALIGNMENT MAGNET
Figure 1
4 ) M a k e t h e d o t a t t h e s c r e e n
c e n t e r a t r u e c i r c l e a s
s h o w n i n
Figure 2
t h e 4- P o l e m a g n e t s h o w n in
.
Figure 1
5 ) A l s o a d j u s t t h e R e d a n d
B l u e C R T b e a m s h a p e s a c -
c o r d i n g t o t h e s t e p s ( 1 ) t o
(3).
6 ) A f t e r t h e a d j u s t m e n t i s
c o m p l e t e d , r e t u r n R , G a n d
B s t a t i c V R s t o t h e B e s t F o-
c u s p o i n t .
T R U E CIR C L E
D E G R E E a/b
b
S P E C I F I C A T I O N
a : 0 . 9
b : 1 . 1
a
Figure 2
, u s i n g
P A G E 0 8 - 19