A5 Backplane Board - Sony Tektronix AWG2021 Service Manual

Removal and Installation Procedures

A5 Backplane Board

6-46
CAUTION. To avoid permanent loss of waveform files, note the following: A
lithium battery which maintains the nonvolatile memory when power is off is
located on the A5 Backplane board. The nonvolatile memory that contains the
waveforms and their setup parameter data is located on the A6 CPU board.
Removing either board will cause the waveform files, sequence files, and
autostep files in nonvolatile memory to be permanently lost. Before removing
either the A6 CPU board or the A5 Backplane board, save the waveform files,
sequence files, and autostep files in the instrument nonvolatile memory to a
floppy disk. Then, after reinstalling the board(s), reload the files into nonvolatile
memory.
1. Assemble equipment and locate modules to be removed:
a. You will need a screwdriver with a size T-15 TorxR tip and a flat-bladed
screwdriver to do this procedure.
b. Locate the modules to be removed in the locator diagram, Internal
Modules, in Figure 6–4.
2. Orient instrument: Set the AWG2021 with the left side down on the work
surface and the top facing you.
3. Remove all boards: Do the procedure, Circuit Boards, on page 6–42.
4. Remove A5 Backplane board:
a. Remove the five screws and a nut securing the shield cover (see
Figure 6–23).
b. Grasp the shield cover, and take it out.
c. Disconnect the ribbon interconnect cables at J100 on the A4 Power
board and at J410 on the A3 Analog board (see Figure 6–12 and
Figure 6–13).
d. Disconnect the ribbon interconnect cable at J10 on the A5 Backplane
board.
e. Disconnect the flat cable at J6 on the A5 Backplane board.
f. Remove the remaining four screws securing the A5 Backplane board to
the chassis.
g. Using a flat-bladed screwdriver, release the four hooks of the circuit
board support that holds the A5 Backplane board, lift the A5 Backplane
board sideways, and then take it out.
AWG2021 Service Manual