Hitachi 61HDX98B Manual page 70

O P TIC A L S Y S T E M A D J U S T M E N T S D P-8 5 C H A S SIS
Focus adjustment
DP-8 X S eries Chassis:
Preparation for adjustment
1 ) R e c e i v e t h e C r o s s- h a t c h
p a t t e r n s i g n a l .
2 ) T h e e l e c t r 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 h a v e b e e n
c o m p l e t e d .
3 ) D e f l e c t i o n Y o k e t i l t s h o u l d
h a v e b e e n a d j u s t e d .
4 ) B r i g h t n e s s = 5 0 %
•
C o n t r a s t = 6 0 % t o 7 0 %
Adjustment procedure
4 ) S h o r t t h e 2 p i n s u b-
m i n i a t u r e c o n n e c t o r o n t h e
C R T P . W . B . T S , t o p r o d u c e
o n l y t h e c o l o r b e i n g a d-
j u s t e d a n d a d j u s t o n e a t a
ti m e . ( T h e a d j u s t m e n t o r d e r
o f R , G a n d B i s j u s t a n e x -
a m p l e .)
L o o s e n t h e f i x -
2) (See Fig. 1)
i n g s c r e w o n t h e l e n s a s-
s e m b l y s o t h a t t h e l e n s c y l-
i n d e r c a n b e t u r n e d . ( B e
c a r e f u l n o t t o l o o s e n t h e
s c r e w t o o m u c h , a s t h i s
m a y c a u s e m o v e m e n t o f
t h e l e n s c y l i n d e r w h e n
t i g h t e n i n g . )
3 ) R o t a t e t h e c y l i n d e r b a c k
a n d f o r t h t o o b t a i n t h e b e s t
f o c u s p o i n t , w h i l e o b s e r v-
i n g t h e C r o s s- H a t c h .
( O b s e r v e t h e c e n t e r o f t h e
s c r e e n ) .
FIXING S C R E W
LENS A S S E M B L Y R , G , B .
Fig. 1
•
Hint: Located just belo w
the screen are the t w o c e n-
ter speakers. These speak-
ers are mounted on t w o
wooden panels. Remove
the panels to allow access
to the focus rings on the
Lenses.
4 ) A f t e r c o m p l e t i n g o p t i c a l f o-
c u s , t i g h t e n t h e f i x i n g
s c r e w s f o r e a c h l e n s .
5 ) W h e n a d j u s t i n g t h e G r e e n
O p t i c a l f o c u s , b e v e r y c a r e-
f u l . G r e e n i s t h e m o s t d o m i-
n a n t o f t h e c o l o r g u n s a n d
a n y e r r o r will b e e a s i l y
s e e n .
6 ) R e p e a t E l e c t r i c a l F o c u s i f
n e c e s s a r y .
P A G E 0 8 - 20