Removal and Installation Procedures
6-52
TDS 420A, TDS 430A & TDS 460A Service Manual
k. Once the board is clear of all four flex locks, grasp the board by the edge
near those flex locks and rotate that edge upwards slightly and pull the
board out of its retainer slot at its opposite edge.
l. As you lift the backplane assembly out of the chassis, guide the
backplane to attenuator and backplane to acquisition cables up through
their slots in the bottom of the chassis.
m. Lift the assembly all of the way out of the chassis to complete the
removal.
5. Reinstallation:
a. Perform in reverse order substeps 4a-4m reversing the removal
instructions in each substep to reinstall the assembly. Observe the
following precautions as you do the substeps:
H Be sure to guide the backplane to attenuator and backplane to
acquisition cables up through their slots in the bottom of the chassis
when doing step 4l.
H Be sure to align the board to the retainer slot when doing step 4k.
H Seat the board until the four retainers snap over the edge of the
backplane assembly when doing substep 4j.
b. See the following procedures in the order listed to replace modules
removed by the access procedure:
H A08 Jumper Board Assembly, D1 Bus, and Board Supports on page
6--44 (board supports and D1 bus only).
H Front Cover, Rear Cover, Cabinet, Rear EMI Gasket, and Cabinet
Handle and Feet (page 6--27) to reinstall the cabinet and rear cover.
H Line Fuse and Line Cord (page 6 --26) to reinstall the line cord,
which completes the oscilloscope reassembly.
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