Tektronix 5440 Instruction Manual page 60

M
ai
n
te
n
a
n
ce-5440
3. Be
nd
t
h
e leads of t
h
e
n
e
w
com
p
one
n
t to fitt
h
e
h
oles
boa
r
d from its slot to free t
h
e
b
oa
rd
. Also,
r
emove any
i
n th
e
b
oa
rd
. If t
h
e compo
n
ent is replaced w
h
ile t
h
e board
obst
r
uctio
n
s t
h
at wo
u
ld
p reve
n
t t
h
e board from bei
n
g
is mounted i
n
th
e i
n
st
r
ume
n
t, c
u
tt
h
e lea
d
s so t
h
ey will
j
ust
lifted out of t
h
e i
n
st
r
ume
n
t.
p
rotrude t
h
roug
h th
e
b
oard . I
n
sert t
h
e lea
d
s into t
h
e
h
oles
so t
h
e com
p
o
n
e
n
t is fi
r
mly seated agai
n
st t
h
e board (oras
p
ositio
n
e
d o r
igi
n
ally) . If it
d
oes
n
ot seat pro
p
erly,
h
eat t
h
e
3.
L
ift t
h
e circuit boar
d
out of t
h
e u
n
it . Do
n
ot force or
solde
r
a
n
d ge
n
tly
pr
ess t
h
e com
p
onent i
n
to place. be
nd t h
e board .
4. To
u
c
h
t
h
e iro
n
to t
h
e co
nn
ectio
n
a
n
d apply α small 4. To
r
e
p
lace t
h
e board,
r
eve
r
se t
h
e or
d
e
r
of removal.
amo
u
nt of solder to ma k
e α fi
r
m sol
d
er
j
oint . To
p
rotect
U
se care w
h
e
n
replacing
p
i
n
connectors ; if force
d
into
h
eat-sensitive com
p
o
n
ents,
h
ol
d
t
h
e lead betwee
n t h
e
place i
n
correctly, t
h
e
p
i
n
co
nn ectors may be damaged.
com
p
o
n
e
n
t bo
d
y a
nd t h
e sol
d
er joi
n
t wit
h
α
p
ai
r
of lo
n
g-
n
ose
p
lie
r
s or ot
h
e
r h
eat si
nk
.
5. Clip any excess lead
p
rotrudi
n
g t
h
roug
h t h
e board
(if
n
ot cli
pp
ed i
n
step 3) .
6. Clean t
h
e a
r
ea aro
u
nd t
h
e solder co
nn
ectio
n
wit
h
α
flux-removi
n
g solve
n
t.
B
e careful
n
ot to
r
emove i
n
forma-
tio
n p
ri
n
te
d
on t
h
e
b
oar
d
.
CO
MP
O
NEN
T
REM
O
V
A
L
A
N
D
REPL
AC
EMEN
T
Circuit-
B
oar
d
P
i
n
s
CA U TIO N
Most circuit boards in this ίnstrumenta re multί-layer
type boards with α co nductive
p
at
h
(s) laminated
between the top an d botto
m
board layers . All
soldering on t
h
ese board s should be
d
o
n
e with
extreme ca
r
e to preven t breaking the connection to
the ce nte r conducto r(s); only experie nced
maintenance perso nn el should attem
p
t repair of
these boards.
Α circ
u
it-board
p
in
r
e
p
laceme
n
t kit i
n
clu
d
i
n
g t
h
e
WA RN I N G
n
ecessary tools, i
n
structio
n
s, an
d
re
p
laceme
n
t pi
n
s is
availa
b
le from Te
k
tro
n
ix, Inc. Order from your local
To avoid electrical shock, disconnect theinstrument
Te
k
tro
n
ix Field Office o
r
re
p
rese
n
tative . R e
p
laceme
n
t of
from th e powe r sour ce befo r e replacing com-
circ
u
it-boa
r
d pi
n
s on multilayer boards is
n
ot
ponents .
recom
m
e
n
ded; refe
r
suc
h
re
p
ai
r
s to your local Te
k
tro
n ix
Fiel
d
Office or re
p
resentative .
T
h
e ex
p
lode
d
-view
d
rawi
n
g associate
d
wit
h t h
e
R
e
p
laceable Mec
h
a
n
ical Pa
r
ts list may
b
e
h
el
p
f
u
l i
n t h
e
Semiconductors
removal or
d
isassembly of individual com
p
o
n
ents or
s
u
bassemblies. Compone
n
t locations are s
h
own in t
h
e
Diag
r
a
m
s sectio
n
.
C Α U Τ Ι Ο Ν
To avoid component damage, powermust be tur n ed
Circuit
B
oa
r
d
s
off before
r
emoving or replacing semiconducto rs.
If α circuit boa
r
d
is damaged beyo
n
d re
p
air, re p lace t
h
e
e
n
tire boar
d
assem
b
ly . Part
n
um
b
e
r
s fo
r
com
p
letely wired
Semico
nd
ucto
r
s s
h
ould
n
ot be
r
e
p
laced
u
nless actual
boards are given i
n th
e
R
eplaceable Electrical Parts list .
defective . If semico
nd
ucto
r
s are removed
d
u
r
i
n
g
r
o
u
ti
n
e
mainte
n
a
n
ce, retur
n t h
em to t
h
eir origi
n
al soc
k
ets.
To remove o
r r
e
p
lace α boa
r
d,
p
roceed as follows:
Unnecessary replacement of semicon
d ucto
r
s may affect
t
h
e ad
j
ustme
n
t of t
h
is i
n
strume
n
t.
Wh
e
n
semico
nd
uctors
1 . Disco nn
ect all lea
d
s con
n
ecte
d to t
h
e boa
r
d (bot
h
are re
p laced, c
h
ec
k th
e operation of t
h at part of t
h
e
sol
d
ered lead con
n
ectio
n
s and solde
r
less
p
i
n
co
nn
ec-
instrume
n
t w
h
ic
h
may be affecte
d
.
tio
n
s) .
WA RN I N G
2.
R
emove all screws h ol
d
i
n
g t
h
e
b
oa
r
d to t
h
e c
h
assis
or ot
h
er
m
o
un
ting surface. Some boar
d
s may be
h
eld fast
Han dle silicone g r ease with care . Avoid getting
on o
n
e side
b
y α slotted
p
lastic
b ar i
n
additio
n
to t
h
e silicone grease in eyes . Wash hands thoroughly after
screws ; for t
h
ese, remove t
h
e screws, t
h
e
n
pull t
h
e circuit use.
4-8
REV .
Α
JUN
1977