1 2 . VACUUM FLUORESCENT D I SPLAY BOARD
C i r cu I t Descr i p t i on ( cont ' d )
Decode
U 1 7
p i ns
22-25
send
t he
command
s i gna l s to t he
U 1 1
decode r at
p i ns
1 2-1 5 .
U 1 1
sends a
l og i c
LOW
enab l e ( E ) to an I nve r t e r
( e i t he r
U1 2
o r
U 1 5 ) ,
wh i ch I s I nve r t ed t o a
l og i c H I GH a t p i n
1
of a pa r t i cu l a r
B I FET l a t ch / sour ce d r i ve r
( U 1 -U 1 0 ) .
U 1 1
B I F ET
P I n
D r I ve r
5
U 1
p I n
1
4
U2
p I n
1
3
U3
p I n
2
U4
p I n
1
1
U5
p I n
1
1 1
US
p I n
1
1 0
U7
p I n
1
9
U8
p I n
1
7
U9
p I n
1
S
U 1 0
p I n
1
DECODE D I AGRAM
1,81,11,6 14
E
I
U 5
4 8 1 5 A
ST
3 4
5 6 7
8
g
4
U 1 5
U 1 2
R P 3
4 . 7 K
1 0
3
U 1 1
7
74 H C 4 2
5
6
A3
13
A2
14
AI
15
AO
F i g .
1 2-3
1
-8
NOT ES
t71,�
1'91zo
E
U 6
1 /
48 1 5 A
22
ST
12
9
8 7 6 5
4 3
1 3
R P I
4 . 7 K
Summary of Contents for 5000 Plus
Page 57: ......
Page 125: ...3 MPU BOARD Troub l eshoot i ng cont d CLOCK D I AGRAM Vee 3 68...
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Page 242: ...HOPPER CONTROL BOARD Boar d Assemb l y AS 3556 1 3 o 0 o Q5 r 7 4...
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Page 361: ...1 5 APPEND I CES APPEND I X 4 Co i n Mechan i sm I nc 1 5 6...
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Page 383: ...APPEND I X 6 Ser v i ce Su i l e t i ns 1 5 APP END I CES 1 5 1 2...
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