Screwdriver Requirements - Tektronix 7a11 Instruction Manual

Maintenance-7A11
Screw
d
river
R
e
q
uirements
Some of t
h
e smaller screws in t
h
e
P
ro
b
e an
d
Plug-In
Un
it
r
e
q
ui
r
e use of an extremely small-ti
pp
e
d
ph
illi
p
s-
h
ead
screw
d
r
ive
r
. Snap-On @) sc
r
ew
dr iver #SSD
EP
30 is recom-
me
nd
ed . In a
d
d ition, α stan
d
ar
d
screw
d
river wit
h
α 1/16
inc
h
wi
d
e ti
p
is re
q
uired by o
n
e of t
h
e screws in t
h
e
Pr
obe.
Soldering
Eq
ui
p
ment an
d
Tec
h
ni
q
ues
Solde
r
i
n
g
Eq
ui
p
ment . Ordi
n ary electrical solder (rosi
n
co
r
e) s
h
o
u
ld be used for all circuit re
p
airs . T
h
e sol
d
eri
n
g
i
r
on s
h ould be selecte
d
in accor
d
ance wit
h
t
h
e wor
k
bei
n
g
d
o
n e, as follows:
Sol
d
ering on Plug-in
Un
it ci
r
cuit
b
oard - 15 to 40
watt iro
n
wit
h α 1/16 to 1/8 inc
h
ti
p
.
Soldering to
P
robe ci
r
cuit
b
oard - 15 watt iron wit
h
α
3/64 inc
h
ti
p
.
E
xce
p
tion is t
h
at α 40
W
iro
n
wit
h
α 3/16
inc
h
tip s
h
oul
d
be used on t
h
e cable tie
d
own strap.
Soldering to metal terminals suc
h
as on switc
h
es a
nd
potentiometers - 40 to 75 watt iro
n
wit
h
3/16 inc
h
tip.
Compo
n ent size an
d d ensity demands t
h
e use of needle-.
nose
p
liers a
n d nee
d
le-
n
ose end
n
i
p
per pliers w
h
en replacing
components . Tweezers are also
h
el
p ful .
H
eat si
nk
s (suc
h
as
small alligator cli
p
s) are inval
u
a
b le for
p
rotecting com-
p
o
n
ents from
h
eat
d
amage, leaving
b
ot
h h
an
d
s f
r
ee for
sol
d
e
r ing. Α
h
old-
d
ow
n
ai
d
can
b
e made fro
m
α woo
d
en
dowel, 6 to 8 i
n
c
h
es long a
n d 1/4 to 3/8 inc
h
i
n diameter .
S
h
ape o
n e end li
k
e α pencil tip an
d
t
h
e ot
h
er en
d
simila
r
to
α screwdriver ti
p
.
N
ote t
h
at t
h e wood will absor
b
only α
minim
u
m of
h
eat from t
h
e iron
b ut will not guard against
h
eat t
r ansfer to t
h
e
p arts being soldered .
F
lux remover
solvent and cotton-ti
pp ed swabs are nee
d
e
d
to remove fl
u
x
f
r
om soldere
d
connections on t
h
e plug-in unit circuit
b
oard .
U
se only water soluble
d
eterge
n
ts, et
h
yl, met
h yl or iso
p
ro-
ph
yl alco
h ol on t
h
e
P
ro
b
e circuit board; ot
h
er solve
n
ts may
d amage it .
Α vacuum-type solder removing
d
evice is extremely use-
ful in removing sol
d
er f
r om connections, ex
p
e
d
iti
n
g com-
p
o
n
e
n
t removal a
n
d
r
e
p
lacement . Ot
h
er soldering aids
s
h
oul
d
be made or
p
urc
h ased to suit s
p
ecific nee
d
s.
Ge
n
e
r
al Sol
d
e
r
i
n
g Tec
h
ni
q
ues.
K
eep t
h
e sol
d
ering iron
well tinne
d
an
d
wipe
d
clea
n
. To avoi
d
excessive
h
eating of
t
h
e general area aro
un
d
t
h e connection, t
h
e i
r
on s
h
oul
d b
e
4-8
completely
h
eated
b
efore bei
n
g a
pp
lied .
Wh
en
r
emoving
com
p
onents, apply
h
eat only lo
n
g e
n
oug
h
to allow t
h
e
p
art
to be remove d
easily . (Ap
p
lying α small amount of solder
between t
h
e ti
p
an
d
t
h
e
j
oint will usually aid in
h
eat trans-
fer on difficult connectio
n
s. T
h
is will decrease
h
eati
n
g of
t
h e general area .)
U
se t
h
e extreme ti
p
of
n
eedle-nose
d p
lie
r
s
to avoi
d
dr
awing off too muc
h h
eat.
Wh en connecti
n
g com-
p
onents,
h
eat t
h
e sol
d
e
r
sufficie
n tly to allow free flow .
Apply
t
h
e sol
d
er to t
h
e wire
b
ei
n
g
j
oine d
, not to t
h
e sol
d
er-
ing iron . Applying α small amount of sol
d
e
r b
etwee
n
t
h
e
iron an
d
t
h e wire will again aid i
n
initial
h
eat transfe
r
. Once
sol
d
er flows between t
h
e ti
p and t
h
e wire, t
h
e solder s
h
oul
d
b e applied to t
h
e o
pp
osite si
d
e of t
h e wire to com
p
lete t
h
e
process. Do not use more sol
d
er t
h an is necessary to ma
k
e α
neat a
n
d
effective
b
o
n
d
.
U
se
h
eat si
nk
s between t
h
e bodies of com
p
o
n
e
n
ts an
d
t
h
e
j
oint bei
n
g sol
d
e
r
e
d
w
h
e
n
ever small com
p onents a
nd
/or
s
h
ort lea
d s are involved . After soldering
h
as
b
een com-
p
lete
d , clip off excess wire, deflecting wire e
nd
s wit
h
α
gloved fi
n
ger o
r
ot
h
er
d
evice to avoid
d amage to fingers,
eyes, or ci
r
cuit components . Remove cli
p
p
e
d
lea
d
s from t
h
e
c
h
assis. Clean t
h
e newly soldered area wit
h
α cotto
n
-tippe
d
swa
b
an
d
et
h
yl, met
h
yl, or iso
p
rop
h
yl alco
h
ol .
Ci
r
cuit
B
oard Sol d
e
r
ing Tec
hn
i
q
ues.
U
se α 15- to 40-
watt i
r
on wit
h
α 1/16 to 1/8 inc
h
tip on t
h
e Plug-in
Un
it
ci
r
c
u
it boar
d
.
U
se α 15 watt iro
n
wit
h
α 3/64 inc
h
ti
p
on
t
h
e
P
robe circuit
b
oar
d
, exce
p
t for t
h
e ca
b
le tie
d
ow
n
stra
p
,
w
h
ere α 40 watt iron wit
h
α 3/16 inc
h
ti
p
s
h
ould be use
d
.
K
ee
p
t
h
e ti
p
well tinne
d
a
n
d
clea
n
. Do not over
h
eat com-
ponents or circuit boar
d
. Do
n
ot use excessive
p
ressure .
To remove α component, grip α lead wit
h
t
h
e ti
p
of α
p
air of needle-
n
ose
d
p
liers. Touc
h
t
h
e ti
p of t
h
e solderi
n
g
iron to t
h
e connection .
Wh
en t
h
e sol
d
e
r
melts, gently pull
t
h
e lea
d
from t
h
e boar
d
. If α clean
h
ole is not left in t
h
e
boar
d
, re
h
eat it an
d
remove t
h
e solder wit
h
α solder re-
moving device ; or bo
r
e it out gently wit
h
α toot
h
-
p
ic
k or
similar non-abrasive
d
evice.
Defective multi
p
le-lea
d
com
p
onents t
h
at cannot
b
e re-
move
d
by t
h
e a
b
ove
p
rocess s
h
ould first
b
e remove
d
b
y cut-
ting t
h
e lea
d
s. T
h en remove t h
e lea d
s one at α time a
n
d
clean t
h
e
h
oles as necessary . If t
h
e leads are
n
ot accessible,
r
emove t
h
e sol
d
er from eac
h
contact
p
oi
n
t wit
h
α solder re-
moving
d
evice, t
h
en wor
k
t
h
e com
p
o
n
ent out, a
pp
lyi
n
g
h
eat alternately to t
h e connections involved .
To replace com
p
o
n
ents, first ben
d
t
h
e leads to t
h
e
p
ro
p
er s
h
a
p
e. C
u
t t
h e leads to pro
p
er size if t
h
e extra lea
d
lengt
h
interfe
r
es wit
h
i
n stallation or cannot be reac
h
e
d
for
c
u
tting after installation . I
n
sert t
h
e leads in
h
oles a
n
d set
t
h
e compone
n
t to t
h
e
p
ositio
n
of t
h
e origi
n
al
p
art. R e
h
eat