Hitachi 61HDX98B Manual page 62

B E A M A LIGN M E N T f or DP-8 5 C H A S SIS
(W A R NING: Remove all rings, watches and jewelry to avoid shock.)
Preparation for adjustment:
1 ) A d j u s t a t l e a s t 3 0 m i n u t e s
a f t e r t u r n i n g o n p o w e r
s w i t c h .
2 ) R a s t e r i n c l i n a t i o n , c e n t e r-
i n g , h o r i z o n t a l a n d v e r t i c a l
a m p l i t u d e s 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 h o u l d b e
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 ) R e c e i v e c r o s s h a t c h s i g n a l s ,
o r d o t p a t t e r n
R A S T E R TIL T a d j u s t m e n t
s h o u l d b e f i n i s h e d .
5 ) S C R E E N F O R M A T s h o u l d
b e F U L L m o d e .
Adjustment procedure:
1 ) G r e e n ( G ) t u b e b e a m a l i g n -
m e n t a d j u s t m e n t :
S h o r t- c i r c u i t 2 P s u b m i n i a-
t u r e c o n n e c t o r p l u g p i n s o f
R e d ( R ) a n d B l u e ( B ) o n t h e
C R T b o a r d s a n d p r o j e c t
o n l y G r e e n (G).
2 ) P u t G r e e n ( G ) t u b e b e a m
align m e n t m a g n e t t o t h e
c a n c e l s t a t e a s s h o w n i n
.
Figure 1
Fig. 1
The figure sho w s t h a t t h e
long and short knobs of the
2P magnet are aligned, this is
the cancel state.
3 ) T u r n t h e G r e e n ( G ) s t a t i c
f o c u s V R c o u n t e r c l o c k w i s e
all the w a y a n d m a k e s u r e
o f p o s i t i o n o f c r o s s h a t c h
c e n t e r o n s c r e e n .
4 ) T u r n G r e e n ( G ) s t a t i c f o c u s
V R c l o c k w i s e a l l t h e w a y .
5 ) T u r n t w o B e a m a l i g n m e n t
m a g n e t i n a n y d e s i r e d di-
re c t i o n a n d m o v e c r o s s
h a t c h c e n t e r t o p o s i t i o n
f o u n d i n s t e p ( 3 ) .
(See Figure 2 belo w ) .
6 ) If i m a g e p o s i t i o n d o e s n o t
s h i f t w h e n G r e e n s t a t i c f o -
c u s V R i s t u r n e d , a d j u st-
m e n t c o m p l e t e .
7 ) If i m a g e p o s i t i o n d o e s
m o v e , r e p e a t s t e p s [ 2 ]
t h r o u g h [ 6 ] .
8 ) C o n d u c t b e a m align m e n t
f o r R e d a n d B l u e i n t h e
s a m e w a y .
9 ) R e d ( R ) f o c u s o n f o c u s
p a c k .
1 0 ) B l u e ( B ) f o c u s o n f o c u s
p a c k .
1 1 ) U p o n c o m p l e t i o n o f a dju s t -
m e n t , p l a c e a s m a l l
a m o u n t o f w h i t e p a i n t o n
t h e b e a m a l i g n m e n t m a g-
n e t s , t o a s s u r e t h e y d o n ' t
m o v e . (If available).
B E A M S H A P E
Preparation for adjustment
IMPORTANT: Screen format
should be "NOR M AL".
1 ) 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
PICTURE TUBE SIDE
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 .
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 .
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 on page
, u s i n g t h e 4- P o l e
0 1- 1 9
m a g n e t s h o w n i n
.
bello w
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 .
ADJUSTMENT
BEAM SHAPE &
TABS
ALIGNMENT MAGNET
4-POLE BEAM SHAPE
CORRECTION MAGNET
ZERO FIELD SPACER
(NO ADJUSTMENT)
2-POLE BEAM
Figure 2
ALIGNMENT MAGNET
Figure 2
P A G E 0 8 - 12