Spectravideo SVI 318 Service – Technical Manual page 133

Du r i ng T i , t h e I N I T IAL l i ne i s " LOW" and the p r i n t e r i s
* 1
he l d in a re s e t s t a t e .
s t a r t s exe c u t i o n a f t e r the l i ne goe s " H IGH" .
*2 A f te r t h e
i n i t i a l i z a t i o n se q u e n c e th e BUSY l i ne goes "L1 )W" .
( 3 )
CLK s i g n a l
( 5 ) S e l f-Te s t P r i n t ing
B r i ng i ng t h e TEST l i ne "LOW" s t a r t s the s e l f- t e s t p r i n t ing wh i c h
c o n t i nu e s unt i l i t i s r et u rne d " H IGH" .
Cha s i s G ro u n d
( 6 )
As s t a t e d in
p a i rs w i t h t he s i g n a l g round l i nes , b u t i t i s f u r t he r recommended
that the ca b l e be sh i e l d e d and tha t one t e rm i na l be conne c t e d to
t he CONTROLLER CHA S S I S GND and t he o t h e r c onne c te d to the FRAME
GND on t h e c on t ro l l e r s i d e .
P r i n t e r
f i n i s h e s exe c u t i o n of the
� 5 00 - 600
I--
a l l o f t h e s i gna l l in e s shou l d be twi s t e d
[ 6 ]-3- ( 3 ) ,
4 . 1 00
The in i t i a l i z a t ion se quenc e
ns
2 .5 J.LS
f = 400 KHz