Tektronix 454A User Manual

M ai nt enance- 454zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA ‘ / R 454A
st r i k i ng t he r ear cast i ng wi t h ± p l ast i c- h eaded mal l et or

Ci r cui t B oar d R epl acement . I f ± ci r c u
i t
b
oar
d
i s d amaged
h ammer
.
Onl y move t
h
e r ear
cast i ng
away
f r om t h
e
i nst r u-

b eyon d r e p ai r , ei t h er t he ent i r e assem b l y i ncl ud i ng al l
ment f ar enoug h t o unsol d er t h e wi r e t h at connect s t he

sol der ed- on com p onent s, or t h e b oar d onl y, can be r e-
– - Axi s b i n d i ng post t o t he cer ami c st r i p on t h e r ear su b -

p l ace d . P
ar t number s ar e gi ven i n t he M ec h ani cal P ar t s L i st
p anel . T he r ear cast i ng can now b e swung away enoug h t o

f or ei t h er
t h
e
com p l et el y wi r e d or t h e unwi r e d boar d . M ost
pr ovi d e f r ee access t o t he r ear su bp anel .

of t he
component s mo u nt e d on t he ci r c u i t boar d s can b e
r e p l ace d wi t h out r emovi n g t h
e
b
oar ds f r om t he i nst r ument .
O b ser ve t h e sol d er i ng p r ecaut i ons gi ven
u n
d
er Sol d er i ng
Swi ng- Out C h assi s . Some of t he cont r ol s a n d connect or s

Tec h ni qu es i n t h i s sect i on .
ar e mount ed on ± swi ng- out c h assi s on t he r i g ht si d e of t h i s
i nst r u ment . T he Cal i br at or ci r cui t boar d i s al so mo u nt ed on
t he r ear of t h i s c h assi s . To r eac h t he r ear of t h i s c h assi s or

G ENER
A L :
t he com p onent s mo u nt ed be h i nd i t , f i r st r emove t h
e
t o p
cover f r om t he i nst r ument . T h en l oosen t h e ca p t i ve secur -

Most of t h e co n nect i ons t o t he ci r cui t b
oar d s ar e ma d e
i ng scr ew so t he ch assi s can swi ng out war d .

wi t h

p i n

connect or s .

H owever , sever al connect i ons ar e
sol d er ed
t o t h e V er t i cal Out p u t Am p l i f i er an d V er t i cal P r e-
amp boar d s .
See t
h
e s p eci al r emoval i nst r uct i ons t o r emove
Cer ami c Ter mi nal

St r i p

R e p l acement .

R e p l acement

t hese boar d s .
st r i ps ( i ncl ud i ng st u d s) and s p acer s ar e s u pp l i e d u n d er
se p ar at e p ar t num b er s . H owever , t h e ol d sp acer s may b e
r e- used i f t h ey ar e not d amage d . T he a pp l i ca b l e Te kt r oni x

U se t he f ol l owi ng p r oce d ur e t o r emove ± ci r c u i t boar d .
P ar t N um b er s f or t he cer ami c st r i ps an d sp acer s used i n t h i s
i n st r ument ar e gi ven i n t h e
M
ec
h
ani cal
P
ar t s L i st .

1 . R emove
al l scr ews h ol d i ng t h e boar d t o t he c h assi s .
To r e p l ace ± cer ami c t er mi nal st r i p , u se t h e f ol l owi ng
pr ocedur e .
2 . T h e b oar d may now
b e l i f t ed f or mai nt enance or
access t o ar eas beneat h
t
h
e
b
oar d .
REM O V A L :

3 .
To
com
p
l et el y
r emove t he boar d , d i sconnect t he pi n
1 . U nsol der al l com po nen t s an d connect i ons
on t he

connect or s .
st r i p . To ai d i n r epl aci ng t h e st r i p , i t may be a d vi sa b
l e t o
mar
k
eac h l ea d or d r aw ± sk et c h t o s h ow l ocat i on of t h e

4,
R
emove t he ca b l e cl am p s ( i f any) h ol d i ng t he ca b l e t o
component s an d connect i ons
.

t he boar d .
2 . P r y or pul l t he d amage d st r i p f r om t he c h assi s .
5 . L i f t t he ci r c u i t b oar d ou t of t h e i nst r u ment .
Do not
f or ce or ben d t he b oar d .
3 . I f t he s pacer s come out wi t h t h e
st r i p , r emove t h em
f r om t he st ud pi ns f or u se on t he new st r i p
( s pacer s s h oul d
be r e p l ace d i f t hey ar e d amage d ) .

6 . To r epl ace t h e boar d , r ever se t h e or der of r emoval .
Cor r ect l ocat i on of t he p i n connect or s i s s h own i n F i gs .
8- 1
REPL
AC EMEN T :

t h r oug h 8- 16
.
R e p
l ace t he p i n connect or s car ef ul l y so t hey
mat e cor r ect l y wi t h t h e p i ns
.
I f
f or ce d i nt o p l ace i ncor -
1 . P l ace t he s p acer s
i n t h
e c
h
assi s
h ol es .

r ect l y p osi t i oned, t h e p i n connect or s
may b e damage d .
2 . Car ef ul l y p r ess
t
h
e st u d s of t h e st r i p i nt o t he s p acer s

V
ER TI CA L PRE A MP UN
I T REM OVA L :
unt i l t hey ar e compl et el y seat e d . I f
necessar y, use ± sof t
mal l et an d t a p l i g h t l y, d i r ect l y over t h e
st u
d ,
t o seat t he

U se t h e f ol l owi ng pr oce d ur e t o
r emove t he V er t i cal P r e-
st r i
p
com p l et el y .

am p boar d an d at t enuat or s as ± uni t .
3 . I f t he st u d ext en d s t h r oug h t h
e
s p
acer s, cu t of f t he

1 . R emove al l of t h e k
nobs f r om I n p ut Cou p l i ng
excess .

swi t c h es, t he VO L TS/ DI V
swi t c h es, t h e P OSI TI O N con-
t r ol s an d t h e V er t i cal M OD E
/ T RI GG ER swi t c h .
4 . R e p l ace al l com p onent s an d
connect i ons . O b ser ve t he
sol d er i ng p r eca u t i ons gi ven un d er Sol d er i ng Tec h ni qu
es i n

2 . R emove t he ext ensi on r od
f r om t he CH 2 I NVER T
t h i s sect i on .

swi t c h .
4- 1 1

Tektronix 454A Specifications

General

Brand	Tektronix
Model	454A
Category	Test Equipment
Language	English