Bally 5000 Plus, Manual

Page: 119 / 388

3 . MPU BOARD
Troub l eshoot i ng ( cont ' d )
MPU BOARD SYMPTOM/FLOWCHART TABLE
NOTE :
T h i s t a b l e I s t r ue when t he o t he r p r i n t e d c i r cu i t
boa r ds I n t he mach i ne a r e good .
Symp t om
F l owc h a r t
Comp l e t e powe r up f a l l u r e Powe r U p Se l f - t e s t
w i t h n o game ope r a t i on s
CHECK BATT ERY t I I t B a t t e r y De t ec t
N o game p l ay C l ock
No d i sp l ay R e s e t
Game r e se t s Wa t c h dog
D t ack
See J umper Se l e c t T a b l e
D i sp l ay I s b l ank P I A
T e s t sw i t c h not f u n c t i on i ng V I A
Key p a d not f u n c t i on i ng Se l ec t o r / I n t e r r u p t
N o sound
Hopp e r not f u n c t i on i ng
Rea l t i me c l ock cannot be set Rea l T i me C l ock
Cannot e n t e r t i me w i t h keypad
DOOR O P E N DUR I NG POWER DOWN Door L a t c h
cannot be c l ea r e d
Me t e r d a t a I nva I I d S a f e RAM
No s e r i a l commun i ca t i on DUART
NOTE :
The f l owcha r t s I so l a t e t he I C , but t he f au l t cou l d be t he I C or any o f t he
assoc i a t e d d i s c r e t e componen t s .
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