Circuit Boards - Sony Tektronix AWG2021 Service Manual

Removal and Installation Procedures

Circuit Boards

6-42
This procedure describes how to remove the following circuit boards:
H A6 CPU Board
H A21 Control Board
H A10 Synthesizer Board
H For Option 02: A31 Control Board
H For Option 03: A9 ECL Digital Data Out Board
H For Option 04: A25 TTL Digital Data Out Board
H For Option 09: A7 Floating Point Processor Board
1. Assemble equipment and locate modules to be removed: No tools are needed;
however, the maintenance kit includes an ejector that is useful in removing
circuit boards from the chassis. Locate the modules to be removed in the
locator diagram, Internal Modules, in Figure 6–4.
2. Remove the rear shield cover: Do the procedure, Rear Shield Cover, on
page 6–33.
3. Orient instrument: Set the AWG2021 with the left side down on the work
surface and the top facing you.
4. Remove board support: Remove the board support upward while pushing its
hook to the inside.
5. Remove A6 CPU board:
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.
a. Disconnect the ribbon interconnect cable at J50 and J64 on the A6 CPU
board (see Figure 6–22).
b. Disconnect the flat cable at J75 on the A6 CPU board. Remove the flat
cable as shown in Figure 6–22.
c. Grasp the upper part of the A6 CPU board, and pull upward to remove it.
AWG2021 Service Manual