6-19
d. Remove the six screws securing the Main board to
the Front casting. The screws are located on the face of
the casting and are adjacent to the four BNC connectors.
c. Pull the Front Panel assembly forward until it is clear
of the Front casting and the face of the Front casting is
accessible (it is not necessary to disconnect the cables
connecting the assembly to the main instrument).
b. Perform parts a through h of Step 4 to remove the
Front Panel trim ring.
5. Main Board Removal
a. Perform Step 1 to remove the cabinet from the
instrument.
Reverse parts a through t to assemble the Front panel
assembly and install it on the instrument. Take care to
align the GPIB Status indicators to their holes in the trim
ring when installing that band.
(3) Turn the Front panel face down and remove the
four mounting screws from the Front Panel Control
board. Separate the Front panel from the board.
(2) Pull straight out on the remaining five control knobs
to remove them from their shafts.
(1) Using a 1/16 inch allen wrench, remove the CH 1
and CH 2 VOLTS/DIV control knobs, as well as the A
and B SEC/DIV control knob.
t. To remove the Front Panel Control board from the
Front panel, perform the following subparts:
s. Gently push the backside of the Front Panel Control
assembly until it is removed from the Front casting.
r. Carefully route the connectors disconnected in parts
o and q to the inside of the instrument.
q. Disconnect the ribbon cable connector from J152 of
the Main board. J152 is located in front of the High Volt-
age shield, at the lower left side of the instrument.
p. Remove the anode lead from its retainer and dress
it away from the lower square hole in the Main chassis.
Take care not to separate the male end of that lead from
the female end.
Maintenance-2430 Service
o. Disconnect the ribbon cable connector from J150 at
the front of the Side board.
n. Disconnect the ribbon cable connector from J166 on
the Low Voltage Power Supply board and push it towards
the rear of the instrument. J166 is located at the left-front
section of the board near the front corner of the Center
chassis.
m. Continue to rotate the Top chassis until it is at a
180 degree angle to the top of the instrument.
I.
Grasp the left edge of the Timebase/Display board
and rotate it (and the Top chassis) upward about 45
degrees. While supporting the Top chassis, disconnect the
flex cable at J125 (right-rear corner of the Processor board
on the underside of the Top chassis).
k. Using a 7/32 inch nutdriver, rotate the two black
retaining latches counterclockwise 1/4 turn to unlock them.
The two retaining latches are located near the left-front
and left-rear corners of the Timebase/Display board.
j. Remove the three mounting screws securing the
Timebase/Display board to the Center chassis.
i. Turn the instrument over so its top side is up.
h. Grasp the edges of the trim ring and pull forward to
remove it from the Front casting.
g. Remove the two remaining screws securing the trim
ring.
f. Turn the instrument over to expose the bottom of
the trim ring and remove the two screws securing the front
feet to the instrument. Remove the feet from the trim ring.
e. Remove the four screws exposed by part d.
d. Using a small, flat-bladed screwdriver, gently pry
loose and remove the top trim cover.
c. Pull straight out on the INTENSITY control knob to
remove it from its shaft.
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