Troubleshooting
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TDS 420A, TDS 430A & TDS 460A Service Manual
3. Wait: The internal diagnostics do an exhaustive verification of proper
oscilloscope function. This verification takes about two minutes. When
finished, the oscilloscope displays a report of any bad modules or interfaces.
Firmware Updates
Firmware updates are easy to do. Simply install the firmware disks on your PC
and follow the instructions in the README file located on the first disk. The
firmware update kit is listed as an optional accessory in Chapter 10.
NOTE. You must set both switches of the Protection switch to the unprotected
position before updating the firmware. Figure 6--29 shows how to set the switch.
After loading the firmware, be sure you set both switches back to the protected
position and cycle power.
If you want to order a firmware update, see Optional Accessories in Chapter 10
Mechanical Parts List for the part number.
Flip both switch levers toward
the board (closed) to enable
updating of firmware.
Figure 6- 29: Accessing the protection switch
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