b. Set the instrument on a flat, smooth surface, with
its underside facing down and the Front panel facing
forward.
4. Front Panel Board Removal
a. Perform Step 1 to remove the cabinet from the
instrument.
Reverse parts a through k to install the board on the
Top chassis and to secure the Top chassis to the Center
chassis. Take care to fit the edge of the board to the four
channel notches when installing it on the Top chassis.
k. Grasp the right edge of the board and pull it slightly
away from the Top chassis until it clears the head of the
retaining latch unlocked in part
j.
Pull up on the board until
the left edge of the board slips out of the four channel
notches on the Top chassis.
j.
Rotate the black retaining latch (center-right edge of
the Processor board) 1/4 turn counterclockwise to release
the board from the Top chassis.
i. Disconnect the ribbon cable connectors at J181 and
J120 of the Processor board. J181 and J120 are located
at the left rear corner of the board.
h. Disconnect the ribbon cable connector at J123 of
the Processor board (instruments with Option 05 installed
only). J123 is located at the rear quarter section of the
board near the center.
g. Disconnect the ribbon-cable connector from J103
and the flex cable connector from J207 of the Processor
board. J103 and J207 are located at the left-front corner of
the board.
f. Continue to rotate the Top chassis until it is at a 180
degree angle to the top of the instrument. The top of the
Processor board is now exposed.
e. 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
ribbon cable connector at J131 (left-front corner of the
Timebase/Display board) and the flex cable at J125 (right
rear corner of the Processor board on the underside of the
Top chassis).
6-18
d. 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.
c. Remove the three mounting screws securing the
Timebase/Display board to the Center chassis and Power
Supply.
b. Set the instrument on a flat, smooth surface, with
its underside facing down and the Front panel facing
forward.
3. Processor Board Removal
a. Perform Step 1 to remove the cabinet.
Reverse parts a through I to install the board to the
Top chassis and to secure the Top chassis to the Center
chassis. Take care to fit the right edge of the board to the
four channel notches when installing the board on the Top
chassis.
I.
Grasp the left edge of the board and pull it slightly
away from the Top chassis until it clears the head of the
retaining latch unlocked in part k. Pull up on the board
until the right edge of the board slips out of the four chan-
nel notches on the Top chassis.
k. Rotate the black retaining latch (center-left edge of
the Timebase/Display board) 1/4 turn counterclockwise to
release the board from the Top chassis.
j. Continue to rotate the Top chassis until it is at a 90
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
ribbon cable connector at J131 (left-front corner of the
Timebase/Display board) and the flex cable at J125 (right-
rear corner of the Processor board on the underside of the
Top chassis).
h. Using a 7/32 inch nutdriver, rotate the two black
plastic 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.
Maintenance-2430 Service
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