E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
A18 CPU Turn–On Test
1-5
CPU Data Backup
This procedure applies only if the CPU is working prior to removal.
1. Record the installed license keys:
a. Press
Utility > Instrument Adjustments > Instrument Options > Software Options.
b. For each option that has a check mark after the license key, write down the option number and the license
key.
Take your time to be sure that you record each license key correctly.
2. Backup the calibration data from the CPU to the mother board:
• Execute the SCPI command: :DIAG:FILE:BACK.
3. Follow the instructions from Chapter 3, Assembly Replacement, to replace the CPU board.
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