Page 4-8
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P osi t i o n t h e chassis so the front is toward you.
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Lo cat e t h e R OM i n t e g r a ted ci r c u it ( U 1 9 0) a nd
t he PAL i n t e grated ci r c ui t ( U 1 61) on th e m a i n
circuit board.
•
U se a n I C p u l l e r as shown in t h e i n s et drawi n g
t o remove RO M a n d P A L I C ' s f r o m t h e m a i n
c ircuit board. Set these IC's aside; they w il l n o t
be needed again.
M ODIFYIN G THE M A I N C I R C UIT B O A R D
NOTE: Perform the foll o w i n g steps only if you deter-
mined that you must mod ify the main ci r c ui t board .
R efer to I l l u s t r ation B o ok , Page 9, P i c t o r ial 4- 9 f o r
the follow in g steps.
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B y l i f ti n g t h e i n n e r p a r t o f t h e c a r d p u l l e r s ,
carefully u n p l u g the Z-207 controller card from
t he mai n c i r c u i t b o a rd . T h e n s l i d e i t u p a n d
o ut o f t h e c a r d c a ge. Set t h e c o n t r o l l e r c a r d
a side temporari l y .
•
In st al l t h e n ew R OM ( HE 444-87-S) on the main
c ircuit board at U 1 90 . M ak e sure you p o s i t i o n
t he pin 1 en d o f t h e I C t o w ar d th e i n d e x m a r k
on the circuit board .
•
U se the same p r o c edure t o r e m ov e an y o t h e r
cards that may be in the Computer.
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Sim i l ar l y , i n s t a ll t h e n ew P A L ( H E 4 4 4 - 129-1)
on the main cir c ui t board at U161.
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Rem ov e t h e f o ur 4-40 x V 4 " screws at locations
P , R, S, and T w h i c h s e c ur e th e c ar d c age t o
the main circuit board and chassis.
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L ocat e p r o g r a m m i n g j u m p e r ) 1 02 on t he m a i n
c ircuit bo a rd. T he n u n p l u g i t f r o m t h e 0 p o s i -
t ion an d r e i n s t al l i t i n t h e 1 p o s i t i o n , t o w a r d
the edge of the main board.
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Rem o v e t h e t w o P . 6 x V ~ " s heet metal s crews
a t locations A U a n d A V w h i c h h o l d t h e c a r d
cage to the rear of the chassis.
NOTES:
1 .
If y o u d e t e r m i n e d t h a t y o u m u s t m o d i f y t h e
main circuit board, proceed to " M o d i f y i n g th e
Main Circuit Board ."
•
L if t t h e c a r d c a g e up a n d r e m o v e i t f r o m t h e
c hassis. Set the card cage aside temporari l y .
Refer to Il l u s tration B o ok , Page 9, Pictorial 4 -10 for
the follow in g steps.
•
Rem o v e t h e n i ne 4-40 x ' / 4 " screws at locations
A , B, C, D, E, F, G, H , an d J w h i c h s e c ure t h e
main circuit board to the chassis.
2 .
If y o u d o n o t h a v e to m o d i f y t h e m ai n c i r c u i t
b oard, s k i p " M o d i f y i n g t h e M a i n C i r c u i t
B oard" an d p r o c eed d i r e c tl y t o " R e i n stal l i n g
the Video Logic Circuit Board."
•
R em o v e t h e t h r e e l o ng s pacers at l o c ations K ,
L, and N.
Summary of Contents for Z-100 Series
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