Service
Information—
T91
2
5.
Remove the
four
retaining screws holding the
board
to
the chassis.
6. Lift the board out.
7. To
reinstali the Storage board, reverse the above
procedure.
Cathode Ray Tube
(CRT)
Replacement
VVARN^N^j
Use care
when handling a
art. Protective clothing
and
safety glasses
should be worn. Avoid striking it
on any object
which might cause
it to crack or
implode.
When storing a crt,
place
it in
a
protective
carton
or set it face down
on
a
smooth surface In a
protected
location
with a soft mat
under the
faceplate
to protect it
from
scratches. To
avoid
shock
from any
residual charge
from
the normal
—2700 volts on the cathode
terminal,
do not touch
the crt
pins while removing the crt socket
from its
base.
To remove the
crt from the
instrument, disconnect
power cord plug
from
power input
source
and remove
cabinet
halves. Turn the
front of
the
Instrument toward
you,
and perform the
following steps.
1
.
Disconnect the
5-wire plug
from P950 on the Storage
board.
(The wires
from P950 are connected to
the
crt and
are removed
with
it. The new crt is
supplied with these
wires and
plug).
2.
Disconnect the 2-pin plug
(terminating a red wire and
a brown wire)
from J470 on the
Interface board.
These are
the Trace Rotation (TR ROT)
ieads.
Some boards may
have this connector
marked P9, rather
than
J470.
3.
Disconnect the 5 individual wire
connectors
from the
pins
around
the top and
left
side of the crt neck. For
reference
when installing the new crt, the color codes
of
these
wires (reading from top right to
bottom
left) are:
green-on-white,
red-on-white,
yeliow-on-white, blue-on-
white, and
brown-on-white.
4.
Grip the
14-pin socket and pull it back off of the base
of the
crt (see
warning preceding step
1).
5.
Carefully
raise the plastic crt front
support
ring
upward
and
to the right to disengage
the
2
buttons on
the
bottom
and 2
buttons
on the
left side from the
instrument
chassis.
NOTE
Although
it
may
be
more
convenient,
it is not
necessary
to remove any front
panel
or subpanel
controls
or
parts. The
foregoing
steps will allow
the
front
of
the crt to be moved to
the right of its
normal
position while
slightly
bending the
plastic subpanel
to allow
clearance
for the crt to be pulled
forward out
of
its shield.
6.
Gently
press forward
on the
crt base while
suppor-
ting
the
front of the crt until the front extends far
enough
forward to grasp
while
pulling
the crt far enough forward
to
push the
P950 plug and wires down through the
hole
in
the top
of
the crt shield, then
pull
the
crt
the
rest of
the way
out
of
its shield.
7,
To
install a new crt,
reverse the above procedure.
(Push the P950 plug
and wires up through the
hole
in the
top of the
crt shield before fully
inserting
the crt.)
REPACKAGING
FOR SHIPMENT
If the Tektronix
instrument
is to be shipped
to
a
Tektronix
Service
Center for service
or repair, attach a tag
showing;
owner (with
address)
and the name
of an
individual at
your
firm that can be
contacted.
Include
complete instrument
serial
number and a
description of
the service required
Save
and re-use the package
in which your instrument
was shipped. If the
original packaging is
unfit
for use or
not
available, repackage
the instrument as
follows:
Surround the instrument
with polyethylene sheeting
to
protect the
finish of the instrument.
Obtain
a carton of
corrugated
cardboard of the
correct
carton strength
and having inside
dimensions of
no less than six
inches
more than the
instrument dimensions.
Cushion
the
instrument
by
tightly packing three
inches of dunnage
or
urethane foam between
carton
and instrument, on
all
sides. Seal
carton
with shipping tape
or
industrial
stapler.
The carton
test
strength
for your
instrument is 275
pounds.
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