Bally 5000 Plus, Manual

Page: 207 / 388

Troub l es hoot i ng ( con t ' d )
I NP U T PORT B I TS F A I L U R E F LOWCHART
I N P U T
P O R T B I T S
F A I LU R E
S u
No'. 1
GOOO
5 •• No'.
2
R E P L A C E
0 2
T h r u
0 6
ASSOCI ATED W I T H
FAI L I N G B I T
NOTE 1 : Check res i stor pack and s i p for open connect i ons .
E X T E R N A L
S W ITCH
F A I L U R E
NOTE 2 : The output p i ns ( 3 , 5 , 7 , 9 , 1 2 , 1 4 , 1 6 , 1 8) shou l d ref l ect the i nputs when RPx
goes l ow , and on l y wh i Ie i t stays l ow . (very fast pu l se )
*
Data a t i nputs must be va l i d a t the fa l I i ng edge o f the WPx . Look for fau l ty
propagnant de l ays .
*
Good l og i c l eve l s 0-5 VDC - l ook for d i storted waveforms . Poss i b l e f i nds
wou l d be 1-0 VDC pu l ses or 4-5 VDC pu l ses .
4 .
I /O BOARD
4-39