4 .
I /O BOARD
C i r c u i t D e s c r i pt i on ( con t
'
d )
Troub l es hoo t i ng
V i sua l Boa r d I nspe c t i on
T h e f i r s t s t e p i n t r oub l e s hoot i ng
t he
I /O boa r d
i s
t he
v i sua l
i ns p e c t i on f o r p r ob l ems .
Fo l l ow t h i s c h eck l i s t .
1 . Check
t h a t
t he
I C c h i ps
a r e
p r oper l y sea t e d ( no b e n t p i ns o r
e x posed p i ns ) .
2 . Check for p r op e r p i n no t a t i on
( p i n 1 i s i n pos I t i on 1 , e t c . )
3 .
Check
t h a t
t he
socke t e d
compone n t s ( c h i ps ) a r e i n t he i r
cor r e c t boa r d l oc a t i on .
4 . Check for so l de r s ho r t s .
5 . Check for p r oper s t r ap a t t he S 1
l oc a t i on .
6 . Check
for
s ho r t e d
o r
open
t r aces .
( i mposs i b l e
t o
see
t r a ces i n l aye r s i n mu l t i - l ay e r
boa r d )
7 . Fee l componen t s f o r hea t
c aused
b y an i ns i de s h o r t .
Check Boa r d
a n d G r ound
To c h e c k for g r ound
vo l t a ges at v a r i ous I C
t h e
Boa r d
Schema t i c
Sect i on .
a n d p r op e r
c h i ps , s e e
i n
t h i s
NOT E : Check vo l t a ge w i t h
p r ope r l y
r e f e r enced g r ound .
4-28
Remove I C Ch i p f r om
�
Mu l t i - l a ye r e d
Boa r d
T o r emove I C c h i ps f r om a mu l t i
l a y e r e d boa r d w i t hout damage t o t he
m i dd l e
l ay e r s '
p r i n t ed
c i r cu i t
t r aces
a n d p a d s ,
fo l l ow
t hese
s t e p s .
1 . I so l a t e t he f au l t y c h i p .
2 . U s i ng
cut t e r s , cut t he p i ns
a t
t he c h i p a n d r emove t he c h i p .
3 .
H e a t e a c h p i n w i t h a
so l de r i ng
i r on u n t i I t he
so I d e.
ho l d i ng
t h a t p i n me l t s .
4 . E a s i I y r emove t he p i n us i ng l on g
nose p i i e r s . T h i s l eaves t he
i n t e r na l t r aces a n d p a d s i n t a c t .
NOTE :
A copper r i ng on t he
p i n
s hows t he boa r d i s damage d .
5 . Ca r e fu l l y , r emove a n y
so l d e r
f r om t he ho l es us i ng a so l d e r i ng
i r on a n d a so l de r suc k e r .
Содержание 5000 Plus
Страница 18: ...2 TEST EQU I P ENT Th i s i l l ust r a tion w i I I be supp l i ed at a l a t e r da t e F i g 2 1 2 5...
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Страница 125: ...3 MPU BOARD Troub l eshoot i ng cont d CLOCK D I AGRAM Vee 3 68...
Страница 149: ...3 MPU BOARD Troub l eshoot i ng cont d 3 92 LOW VOLTAGE D I AGRAM Vee R 6 12 1 10K C l l T M V 16V R4 O K R 7 CR3 v...
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Страница 242: ...HOPPER CONTROL BOARD Boar d Assemb l y AS 3556 1 3 o 0 o Q5 r 7 4...
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Страница 283: ...R E E L 1 MOTOR POWER FLOWCHART B A D R E E L 1 M OTOR P OW E R FA U LT I S O LA T I O N 9 R E E L CONTROL BOARD 9 25...
Страница 284: ...9 REEL CONTROL BOARD 9 26 REEL 2 MOTOR POWER FLOWCHART BAD R E E L 2 MOTOR P O W E R FAU LT I S O L A T I O N...
Страница 285: ...R E E L 3 MOTOR POWER FLOWCHART BAD R E E L 3 MOTOR POW E R F A U LT I S O L AT I O N 9 R E E L CONTROL BOARD 9 27...
Страница 286: ...9 REEL CONTROL BOARD 9 28 REEL 4 MOTOR POWER FLOWCHART REEL 4 M OTOR POWE R F A U LT I S O L A T I O N...
Страница 287: ...REEL 5 MOTOR POWER FLOWCHART GOOD R E E L 5 MOTOR POW E R F A U LT I S O L A T I O N 9 R EEL CONTROL BOARD III 9 29...
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Страница 361: ...1 5 APPEND I CES APPEND I X 4 Co i n Mechan i sm I nc 1 5 6...
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