24 E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
A18 CPU Turn–On Test
No Instrument Control From the Front Panel
Refer to “Front–Panel Display Assembly Troubleshooting” on page 30.
Error Messages
If error messages are reported after the turn–on check is completed, refer to
the Error Messages list, located on the E8257D/67D PSG Signal Generator
Documentation Set CD (part number E8251–90351) for details.
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.
Table 1-3 A18 CPU LED Sequence Table
Sequence DS1 DS2 DS3 DS4 DS5 DS6 DS7 DS8
1 XXXXXXXX
2 00X00000
3 XXX00000
4 0XXXXXXX
5 00000000
6 XXXXXXX0
X = LED is on; 0 = LED is off
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