Simrad RA771UA, Instruction Manual

Page: 27 / 46

4.
MAINTENANCE
4.1 Preventive maintenance
E x t e n s i v e u s e of i n t e g r a t e d c i r c u i t r y and s o l i d - s t a t e
t e c h n o l o g y t h r o u g h o u t t h e equipment e n s u r e a h i g h d e g r e e
o f r e l i a b i l i t y over a l o n g ,
trouble- free service l i f e . .
There is
l i t t l e
p o s s i b i l i t y t h a t problem w i l l o c c u r w i t h i n
a f e w y e a r s of i n s t a l l a t i o n , p r o v i d e d p r e v e n t i v e
maintenance i s p r o p e r l y c a r r i e d o u t .
performed r e g u l a r l y t o e n s u r e s a t i s f a c t o r y o p e r a t i o n and
performance, r e d u c e t h e p o s s i b i l i t y of
e l e c t r i c a l
and
mechanical m a l f u n c t i o n s , and
t o
p r o l o n g s e r v i c e l i f e .
are l i s t e d o n t h e f o l l o w i n g p a g e s .
P r e v e n t i v e m a i n t e n a n c e f o r
t h e RA771UA
r a d a r m u s t be
The m a i n t e n a n c e
t o
b e p e r f o r m e d
a t
r e g u l a r i n t e r v a l s
W A R N I N G : N e v e r i n s p e c t t h e equipment when t h e SWITCH
on t h e d i s p l a y u n i t i s t u r n e d ON (The power s w i t c h on t h e
s w i t c h b o a r d must b e t u r n e d OFF. For
more
s a f t y maintenance,
t a k e o f f u s e s on t h e d i s p l a y u n i t . ) .
A f t e r
t h e POWER
SWITCH
t u r n e d
OFF,
h i g h s t a t i c v o l t a g e may be r e t a i n e d i n t h e CRT
h i g h - v o l t a g e c i r c u i t a n d c a p a c i t o r s a r e a p o t e n t i a l h a z a r d
t o
p e r s o n n e l . D i s c h a r g e h i g h s t a t i c v o l t a g e s t o ground by u s i n g a n
i n s u l a t e d c o n d u c t o r b e f o r e m a i n t e n a n c e .
P r o c e d u r e
Check r a d i a t i o n
f o r
c l o g g i n g
or
accumulation of
s o o t , s a l t , o i l , or p a i n t .
I f found, r i n s e t h e s u r f a c e
w i t h p u r e water and wipe
o f f m o i s t u r e with a s o f t ,
c l e a n c l o t h . (Never u s e
s o l v e n t s such a s g a s o l i n e ,
b e n z i n e , t r i c h l o r o e t h y l e n e ,
or " t h i n n e r " .
Check f o r l o o s e b o l t - n u t s
and c o r r o d e d p o r t i o n s o f
s c a n n e r u n i t mount and
b a s e p l a t e .
Check
f o r l o o s e c o n t a c t on
e a c h c o n n e c t o r of p r i n t e d
c i r c u i t board, and f o r
i m p e r f e c t mounting of any
component.
If
l o o s e , r e - t i g h t e n
w i t h
wrench.
Also
check
for
improper
s e a t i n g of t h e g a s k e t f o r
t h e c o v e r , c o r r o d e d
p o r t i o n s
i n t h e i n t e r i o r
s u r f a c e s
or
on c a s e
s u r f a c e .
Clean t h e d i s p l a y s u r f a c e
w i t h
a s o f t , pure water
moistened c l o t h .