Tektronix 2213 - Page 102

4 . R emove t he A U TO F OC U S control- knob s h aft
assem b ly b y p ulli n g it st r aig h t o u t f r om t he f r o n t p an el .
5 .
R
emove t he P O WER switc h exte n sio n -s h aft pu sh
butto
n
assem b
ly
b y first pressing in t
h
e , P O WER bu tto n to
t
h
e ON
p
osition
.
I n sert α sc r ibe o r simila r tool i n to t he notc h
b etwee n t h
e e
n
d of t
h
e switc
h
s
h
aft a nd t heend of t he
extension
s
h
aft an d gently pry t h e co nn ectio n a p art . Pu sh
t h e exte n sion s h aft
forwar d , t
h
en sideways, to clea r t h e
switc h s h aft . T hen
pull t
h
e exte
n
sio
n
s
h
aft bac
k
a
n
d out of
t he instrume n t .
6 .
Disconn
ect t
h
e leads of
L
925 (ind u ctor), t h e lea d of
t he fuse h ol d er, t h e
lead of
t h
e powe
r
-co
r
d co
nn
ector, and
fo u r lea ds ( Ρ 801, Ρ 802, Ρ 803, an dΡ 804 fr om t he
Cur
r
e
n t
L imit b oard) fro m t he M ai n ci r c u it b oa rd .
7 . U nsolder t h e r ear- pan el ΕΧΤ Ζ AXISco nn ector wi r e
from t h e M ain circ u it boa r d .
8 . Un solder two sets of crt soc k et wi r es from t h e M ai n
circuit board, n oting wire color an d position fo r r ei n stallatio n
refere n ce .
9 . Un sol d er two sets of delay-li ne wi r es fr om t he M ai n
ci
r
cuit boa
r
d,
noting wire
colo
r
and p ositio n for rei n stallation
r
efre
n
ce .
10 . R emove two
screws sec u ring t he
power-supply
tr an sisto r h eat-si nk
assem b ly to t he rig h t side of t h
e fra m e .
11 . R emove
t
h
ree sc r ews securi ng t he M
ai
n
circ u it
b oa rd to t he i n st r ument
frame (one u nd er t h e ΕΧΤ Ζ AXIS
connector
and two alo ng t h e left
side of t h e M ain ci r c u it
b oard ) .
12 . Use α vac
u
um-
d esolderi ng tool to unsolder t h
e 39
interco nn ecting wire
st
r
aps (co nn ecting t h e M ai n ci r
c
u it
b oa rd to t h e Fr on t- Pa n
el ci
r
c u it board) from t h e M ain circ u it
boa r d .
ΝΟΤΕ
if
α vac uu m-desol de r i n g tool is not available, lift eac h
wire
st
r
a p out of t he M ai n circuit boar d as its joint is
h
eated . Use care to maintai n , as nea r ly as possi b le,
t he origi n
al s
h
ape a n d s p acing of t he wir e st ra p s to
facilitate r e p laci n g t he ci r cuit b oa r d .
13 . Pu sh t h e wire-stra p con n ectio n end
of t
h
e M ai n
circ u it b oa r d d own un til it
is clea
r
of t he wire strap ends ;
t hen remove it t h roug h t h e bottom of t h
e inst
r
ume n t frame .
En
s ur e t
h
at t he interco nn ecti ng wi r e st r a p s a r
e
n
ot b e n t out
of
p
lace .
REV
NOV 1982
M ai n tenance-2213 Service
14 . Un sol d er t h
e delay-li n e h older ta b s fr om t he M ain
circuit b oa r d .
To re p lace t he M ain ci r c u it
boa r d, use t h e followi n g
p
rocedu r e :
15 . Insert t he d elay-li n e h
olde
r
tabs i n to t h e r e p laceme n t
circ u it
boar d and sol de r t h em i n p
lace . E nsure t h at t h e h ol d
i n t h
e
front
ta b a nd t he mo u nti ng h
ole
i n
t he ci r c u it board a r e
alig n
ed .
16 . P lace t h e M ain ci r cuit
boar d into t he ch assis f r ame,
en suri ng t h
at t
h
e board is i n t he gui d
es at t h e rea r a nd r ig h t
side of t h
e
fr
ame .
17 . R ei n stall t h ree sc r ews sec ur ing t h
e
M
ain ci r cuit
boar d to t he f r ame (removed i n
ste p 11) .
18 . R ei n stall two sec ur ing sc r ews i n t h
e power-supply
tra n sisto r h eat-sin k assembly ( r emove d i n ste p
10) .
19 . M ove t he front part of t h e M ai n ci r c u it
b oa
r
d
i
n to
p osition
.
Align t he 39 wire st r aps a nd insert t h em into t h
ei
r
cor r
espo
n ding h
oles w h ile maintai n ing t h ei r origi n al sh ape
and spacing .
20 .
R
esol d er t he wire stra p s to t h e M ain ci r cuit board .
21 . R esolder two
sets of d elay-line wi r es at t h e locatio n
note d i n
ste p
9
.
22 . R esolder two sets of crt soc k
et
wires
at t he
locations noted i n ste p 8 .
23 . I n sert and resolde r t h
e
ΕΧΤ
Ζ AXIS conn ecto r wi r e
into t h e M ain circuit board .
24 . R eco n nect t h
e leads of L 925 (in du cto r ), t h e f u se
h ol de r , t he p owe r
cord con
n
ecto
r ,
and fo u r wires from t he
Cu r re n t L imit boar d ( r emoved i n
step 6) .
25 . I n sert t he P O WER switc h
extensio n -s h aft push
b utto n assembly i n to t he fr o n t p anel (from
t
h
e rea r ) . Use α
flat- b it
sc
r ewd r
iver to
h
ol d t he P O WER switc h s h aft fully i n
and alig n t he exte n
sio
n
s
h
aft wit h t he switc h s h aft . P ress
t h em toget h er gently until t h
ey s
n
ap into position .
26 . R einstall t he A U TO F OC US kn
ob
s h aft
assem b
ly
(remove d in step 4) .
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