Bally 5000 Plus, Manual

Page: 330 / 388

1 2-A .
LED
D I SPLAY BOARD
I n t roduc t i on
Th i s s e c t i on cove r s bot h t he n a r r ow and w i de L E D d i s p l a y boa r d . T h e p a r t s and
ob j ec t i ve s of t h i s s ec t i on a r e as fo l l ows :
PARTS
Theory of Ope r a t i on
Boa r d Assemb l y
Connec t o r Loca t i on and Use
T r oub l e s hoot i ng
Boa r d Schema t i cs
Key Wo r d
OBJ ECT I VE S
Know how t he L E D d i sp l a y boa r d func t i on s
Loca t e t he componen t s w i t h p a r t numbe r s
Know t he use o f t he v a r i ous conne c t o r s
Know how t o t roub l e shoo t t he boa r d
Downs i zed L E D boa r d s c hema t i cs
LED -- L i g h t Em i t t i ng D i ode . E a c h L E D h a s seven segmen t s and a dec i ma l po i n t
a s s hown be l ow :
A
F B
G
E C
o DP
0
F i g . 1 2A- 1
Theory of Ope r a t I on
The d i sp l a y boa r d I s b r oken I n t o t wo p a r t s : D i sp l ay A a n d D i sp l ay B . D i sp l ay
con t r o l I n f o r ma t i on I s l oaded when t he se l ec t l i ne ( SE L A o r S E L B ; see
schemat i c ) I s t aken h i g h wh l I e t he wr i t e l i ne I s pu l s e d l ow . SEL A l e a d s to U 1
and con t r o l s t he W I N and PA I D me t e r s ; S E L B l ea d s t o U 2 and con t r o l s t he
CRED I TS , CO I N I N , and LAST I N me t e r s .
1 2A-2
FO-5000- 1 ( Re v A )