Bally 5000 Plus, Руководство пользователя

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9 . REEL CONTROL BOARD
C i r cu i t Descr i pt i on
( con t ' d )
U 1 1 ( U 3 1 ) sends s i gn a l s t o t he
t r a n s i s t o r d r i ve r a r r ay ( U 1 4 ) ( U 34 ) .
U 1 4 ( U 3 4 ) sends an t r i a c g round
s i gna l to t he mo t o r p l ug ( M 1 ) ( M3 )
t o con t r o l t h e s t e ppe r mo t o r
pos i t i ons .
U 1 1 ( U 3 1 ) U 1 4 ( U 3 4 )
M 1 ( M 3 )
I n put Ou t pu t
P i n P i n P i n P i n
1 9 1 5 1 6 1
1 6 1 1
1 0 2
1 5
6 8
3
6 3
2 4
Acce l e r a t i on
Dur i ng acce l e r a t i on , t he l og i c H I GH
0 1 5
s i gn a l a t U 1 1 ( U 3 1 ) p i n 8 I s
l a t c hed t o t he ou t pu t a t p i n 9 .
U 1 1 ( U 3 1 ) p i n
9
sends t he l og i c H I GH
t h r ough CR 1 0 ( CR 3 0 ) a n d t he b i as i ng
r e s i s t o r s R 1 0 ( R 30 ) & R 1 1 ( R 3 1 ) t o
t he b a s e o f 0 1 0 ( 030 ) . 0 1 0 ( 03 0 )
t u r ns ON send i ng t he l og i c LOW
s i gn a l t h r ough R 1 2 ( R 32 ) & R 1 3 ( R 3 3 )
b i a s i ng r e s i s t o r s t o t he base o f
0 1 1 ( 0 3 1 ) .
0 1 1 ( 0 3 1 ) t u r ns ON send i ng + 2 4 VDC
t h r ough t he b l ock i ng d i ode
( CR 1 9 ) ( CR 39 ) t o M 1 ( M 3 ) p i n 6+7 for
t he s t eppe r mo t o r acce l e r a t i on .
CR 1 9 ( CR 39 ) p r e ven t s a + 1 2 V
feedback I n t o t h e 24 VDC .
Con s t a n t RPM
To keep t he r ee l s sp i nn i ng at a
cons t a n t RPM , t h e l og i c LOW 0 1 5
s i gn a l a t U 1 1 ( U 3 1 ) p i n 8 I s l a t c hed
to t he ou t pu t at p i n 9 . U 1 1 ( U 3 1 )
p i n 9 sends t he l og i c LOW t h r ough
CR 1 0 ( CR 3 0 ) and t h r ough R 1 0 ( R 30 ) and
R 1 1 ( R 3 1 ) t o t he base o f 0 1 0 ( 030 ) .
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