Tektronix 5440 Instruction Manual page 62

M
aintenance-5440
3. To replace the defective cam switch contacts, follow
the instructions given in the switch repair kit .
4 . To reassemble the instrument, reverse the
d
is-
assembly proce
d
ure.
receptacles. For storage crt's,
d
isconnect the storage-
element cable connector from the storage circuit board .
1449-18
4-10
6-inch steel r
u
le
r
, or
e
q
uivalent, not o
v
er
0.020 inch thic
k
, inse
r
ted between grati-
cule light reflector and CRT faceplate.
Fig . 4-5. Illustration
s
howing equipment and method used to
correctly align light
r
eflector with
c
rt faceplate.
T
h e red an d b lac k wi res entering
the crt
shield are
0
;
connected to th e trace-rο i α t ίοη co Ι ίns ί de th e
shield . Th ey will not
h am p e r crt removal an d need
n ot
b
e
u
nsolder ed.
Β. PUSHBUTTON SWITCHES
3 .
R
emove the rear
p anel
h olding nuts, then move the
The pushbutton switches are not repairable and should
rear
p
anel away from the instrument by sliding it along the
be replaced as α unit if d
efective .
U se α
d
e-soldering tool to
p
ower cord .
remove solder from the
h
oles in the circuit board when
unsol
d
ering the switches .
4.
R
emove the crt base socket .
Catho
d
e-Ray Tube
R
e
p
lacement . T he following
procedure outlines the removal and replacement of the
5. W ith one hand on the crt faceplate, push on the crt
tube .
R
efer to Figs . 4-5 and 4-6 .
base . Slide the crt forward until the crt anode
p
lug can be
disconnected . For storage crt's, be sure to feed the
W A R Ν 1
N
G storage-element cable through t he slot in the main p ortion
of the crt shiel
d
as the crt slides forward . Pull the crt out of
U
se care wh en handling α crt. Protective clothing
t he instrument from the front.
an d safety
glasses
s
hould
b
e
worn . Avoid striking it
on any
object
which mig h t
cause
it to crac k
o
r
implode . Wh en sto ring
α crt,
p
lace
it in α protective
Β. REPLACEMENT
ca r ton
o
r set
it
face
down in α protected location on α
1 . M ake sure the soft p lastic crt face
p
late supports are
smooth
surface with α soft mat under t h e face p late to
it from
scratches.
in place, then insert the crt into the shield while feeding the
protect
storage-element cable through
t he slot in the shield .
B
efore the crt is com
p
letely inserted, reconnect the anode
Α. REMOVAL
plug and
p lace the steel rulers for
t
he light reflector
1 .
R
emove the bezel assembly which is
h
eld in place
alignment.
with two screws . (The bezel assembly includes α s nap-in
implosion shiel
d
.)
2. With
t
he crt fully inserted and the shiel
d
h ardware
loose, mount the
b
ezel assembly into
p lace and tighten the
2 . Disconnect
d
eflection lea
d
s from crt neck p in
bezel screws .
3 . Position
t
he rear of the crt (socket end) so that there
is no tilt of the faceplate in relation to the bezel assembly,
then tighten the positioning screws . Check
t
hat the four
deflection crt
n
eck pin rece
p
tacles are centered
i
n
t
he
neck shield c utout, then tighten the clamp hardware .
4. P lace the crt base socket onto the crt base
p
ins. '
R
eplace the rear panel . If ap
p
licable, connect thestorage-
element cable to the p in connectors on the storage circuit
board, an
d
connect the deflection lea
d
s to the crt neck
pins .
5 . R
eplacing the crt will require
p artial instrument
adjustment .
R
efer to the A
d
justment section of this
manual .
ι
ι ι
i