Malntenance-2445A/2455A Service
12
. Unplug the CRT socket
by
gently prying evenly on
both sides of the socket until the socket can
be
disen-
gaged from the
CRT
pins. Do not apply side pressure
on
the socket.
13.
Disconnect the connectors (P901, P902,
P903,
and
P904)
from the High-Voltage board. Note connector orien-
tation for reinstallation.
14.
Remove
the four spacer posts securing the High-
Voltage Board to
the chassis.
15.
Carefully tilt the top of the High Voltage board out
far enough
to
clear the chassis side flange while pulling
the board
up
gently
to
disengage the High-Voltage board
pin connectors from the Main board.
16.
Lift the board from the chassis while carefully feed-
ing the CRT socket, cabling,
and
high-voltage lead through
the rear plate slot.
To reinstall the High-Voltage Board, perform the
reverse of the preceding instructions.
A4-Readout
Board Removal
Removal
of the Readout Board
is
accomplished
by
the
following steps:
1 .
Remove
the instrument Cabinet
as
described
in
that
procedure.
2.
Remove the Vertical bracket
as
described
in
that
procedure.
3.
Place
the instrument, left side down, on a flat
surface.
4.
Disconnect the Readout board ribbon-cable connec-
tor
(P411)
from the Main board.
5. With the instrument still
on
its
side,
pull the Readout
board out of its plastic board mounts.
Remove
it from the
instrument while guiding the ribbon cable
and
connector
through the slots
in
the Main board and chassis.
6-28
To reinstall the Readout board, perform the reverse
of
the preceding steps.
A6-Front-Panel
Circuit Board Assembly Removal
Removal
of
the Front-Panel circuit board assembly
is
accomplished
by
the following steps:
1.
Remove
the
instrument Cabinet as described
in
that
procedure.
2.
Set the instrument back into its rear cover with the
CRT facing up. Using a small-bladed screwdriver, gently
pry up
on
the top cover trim strip to release it from the top
edge of the front decorative trim ring.
3.
Remove the four screws from the top edge of the
front decorative trim ring.
4.
Remove the four screws and the two plastic feet
from the bottom edge of the front decorative trim
ring.
5.
Using firm outward pressure, pull the knobs from the
four controls directly below the CRT (INTENSITY,
FOCUS,
READOUT INTENSITY, and SCALE ILLUM).
6.
Slide off the front decorative trim ring. The clear
implosion shield
is
retained by the trim ring. Use care to
avoid dislodging the shield accidentally from its recess
in
the CRT frame.
7.
Disconnect the ribbon-cable connector
(P652)
and
the flex-circuit connector (P651) from the front
of
the Con-
trol Board.
Feed
the flex-circuit connector through the slot
carefully while sliding the front
panel
gently outward.
8.
Pull out the Front-Panel Circuit Board Assembly.
The
following steps describe the further disassembly
of
the Front-Panel Assembly once it is removed from the
instrument.
ASSEMBLY SEPARATION. Separation of the pot
holder module from the Front-Panel Board
is
accomplished
by the following steps:
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