Zenith Z-100 Series, User Manual

Page: 99 / 150

Page 4-7
M ake sure that the pi n 1 en d o f th e IC is p o s i t i o n ed
over the in dex m ark on th e c i r c ui t b o ard (see Detail
4-8B). Also make sure that all of th e p in s are started
into the socket. N O TE : A n I C p i n c a n b e c om e bent
u nder the IC an d i t w i l l a p p ear as th ough i t i s c o r -
rectly installed in the socket,
NOTES:
1 . I f y o u d e t e r m i n e d t h a t yo u m u s t r e p l ace th e
R OM and PA L I C s , p r oceed w i t h t h e f o l l o w -
ing steps.
2 . I f yo u d o n o t h a v e t o r e p l ace th e RO M a n d
P AL ICs, but do n eed to m o d i f y th e m ai n c i r -
c uit board, skip th e f o l l o w i n g s t eps and p r o -
c eed directly t o " M o d i f y i n g th e M a i n C i r c u i t
Board."
SMALL
INOLN'ATION
HOTCH
OT
RIDGE
R efer to I l l u s t r ation B o ok , Page 8, Pi ct or ial 4- 8 f o r
the follow in g steps.
CAUTION: Th is comp u t er contains ESD (Electrosta-
tic Sensitive) devices, Exercise extreme care in han -
dling these devices to prevent damage.
T he pin s o n t h e I C s m a y b e b e n t o u t a t a n a n g l e ,
so they do not line up w i t h the holes in the IC socket.
D o not try t o i n s t all an I C w i t h o u t f i r s t b en d in g t h e
p ins as fol l o w s . T o d o s o m a y d a m age th e I C p i n s
or the socket and cause intermi t tent contact.
B efore you i n s t al l a n I C , la y i t d o w n o n i t s s i d e a s
s hown i n D e t ai l 4 -8 A a n d v e r y c a r e f u ll y r o l l i t t o -
wards the pins to bend the lower pins into l i ne. Then
turn the IC over and bend the p in s on the other side
in the same manner.
PIN I
PIN I PIN I
PIN I
SOCKET
"
. :. . " .
. ' : . :
'
INDEX
OIARK
PIN 1
Detail 4-8B
Pin 1 identifications
Detail 4-8A
IC pins