6-21
c. Disconnect the ribbon cable connector at J148 of
the Timebase/Display board.
b. Remove the mounting screw at the center of the
Side board. Note that for instruments with Option 05
installed, it is necessary to disconnect the ribbon cable
connector at J113 of the Main board to access the mount-
ing screw.
8. Low Voltage Power Supply Assembly Removal
a. Perform Step 1 to remove the cabinet from the
instrument.
Reverse parts a through n to install the High Voltage
Power Supply board. Take care to fit the left edge of the
board to the channel notches when reinstalling the board.
n. Lift the left edge of the board up to clear the retain-
ing latches. Pull the board to the left, until its right edge
clears the two channel notches, to complete the removal.
m. While holding its nut (located between the crt shield
and the adjacent Main chassis) stationary, remove the
mounting post (near the center of the board) securing the
High Voltage Power Supply board to the Main chassis.
I.
Rotate the two black retaining latches (near the
front- and rear-left corners of the High Voltage Power Sup-
ply board) 1/4 turn counterclockwise to unlock them.
crt.
k. Disconnect the crt connector from the back of the
j. Perform parts j through I of Step 4 to access the
inside of the instrument.
i. Pry outward on either one of two retaining latches
securing the fan on its mounting posts. As the latch clears
the edge of the fan, pull the fan outward and away from
the instrument to remove. The latches are located at
opposite corners; one at the bottom corner nearest the
rear, the other at the top corner nearest the front, of the
instrument.
h. Disconnect the remaining ribbon connector from
J105 on the Main board.
Maintenance-2430 Service
REV DEC 1986
g. Disconnect the cable connectors from J172 and
J173, located at the front edge of the board, and from
J162 and J176, located the rear edge of the board.
f. Discharge the five posts on the side of the High Volt-
age module to the metal chassis.
WARNING
I
Thefive mountingposts on the side of the High Volt-
age module(U565)may retain
a
high-voltagecharge
after the instrument is powered off. To avoid elec-
trical shock, discharge these posts to the metal
chassisthroughan appropriateshorting strap.
e. Remove the single screw securing the High Voltage
Power Supply and lift the High Voltage shield off.
d. Disconnect the CRT lead (male end) from the High
Voltage Module lead.
c. Remove the anode lead from the retaining hook that
secures it to the Main chassis.
WARNING
I
The CRT anode lead may retain a high-voltage
charge after the instrument is powered off. To avoid
electrical shock, ground the CRT anode lead to the
metal chassis after disconnecting the plug. Recon-
nect and disconnect the anode-lead plug several
times, grounding the anode lead to chassis ground
each time it is disconnected to fully dissipate the
charge.
b. Set the instrument on a flat, smooth surface with
the High Voltage Supply board facing up and the Front
panel facing forward.
7. High Voltage Power Supply Board Removal
a. Perform Step 1 to remove the cabinet from the
instrument.
Reverse parts a through I to install the Side board in
the instrument. Take care to fit the rear edge of the board
to the channel notch when reinstalling to the chassis.
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