Uniden PB010, Service Manual

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The C D 4 0 0 8 C M O S 4 - Bit F u ll A d d e r - In te r n a l D e s c r i p t i o n
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A l to A 4 a re d e te r m in e d by s e t t in g o f C h a n n e l S e le c t o r ( b in a r y 15 t o 5 9 ); Bl to B4 a re b i n a r y
numbers w h i c h a re g e n e r a te d by th e s e ttin g o f the B A N D S w i t c h and w h e n a d d e d to the
C h a n n e l S e le c t o r b i n a r y numbers g i v e l o g i c " l " or " 0 " Outputs a t SI to S4, w h i c h a re in
tu r n a p p l i e d to th e b i n a r y p ro g ra m m in g o f th e PLL p in s .
The a b o v e e x a m p le shows h o o k u p to th e PB010 and PB042 chassis. For th e PC999 ( G R A N T )
th e p r î n c i p l e is î d e n t î c a l e x c e p t t h a t f e w e r p rogram c o n t r o l Unes a re re q u ir e d w i t h the
M B 8 7 1 9 's c a p a b i l î t i e s . TR28 in th is chassis is a s w it c h t h a t w i l l m ake Pin 10 o f th e M B 8 7 1 9
go H I G H o r L O W as r e q u ir e d t o p reset th e e x t r a N - Codes o f e i t h e r 64 + N o r 128 + N .
(See PLL D E S C R I P T I O N ) -
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