E8257D/67D, E8663D PSG Signal Generators Service Guide 105
Troubleshooting
Troubleshooting Unlocks
512 A7 Reference Unlock
The instrument’s reference is unlocked. Use the following list to troubleshoot
the problem.
— If an external reference is connected:
1. Measure the external reference signal frequency.
2. Measure the external reference signal power level.
3. Compare the results from Step 1 and Step 2 against the
specifications found in the E82x7D PSG data sheet.
4. Check the connection to the PSG along with the connectors.
5. Connect a different external reference source.
6. If the error persists, replace the A7 reference board:
— If the error occurs when you initially connect or disconnect the external
reference:
1. Clear the error queue: press Utility > Error Info > Clear Error
Queue(s).
2. With no changes to the external reference connection, check to
ensure that the error does not reappear.
3. If the error reappears, replace the A7 reference board.
— If none of the above apply, replace the A7 reference board.
513 1 GHz Out of Lock
A 513 1 GHz Out of Lock message indicates a failure on the A7 Reference.
— Replace the A7 Reference.
514 Reference Oven Cold
The Reference Oven Cold Error message indicated the reference has not been
connected to electrical power for 30 minutes. This message appears when the
signal generator is unplugged or the reference assembly is removed. The
message is controlled by a timer and should turn off after 30 minutes. This is
not a failure unless the message does not go off after 30 minutes. If it
continues to be displayed after 30 minutes, replace the A7 Reference.
515 10 MHz Signal Bad
A 515 10 MHz Signal Bad message indicates a problem on the A7 Reference.
The error message remains until it is cleared. Ensure that you clear the error
message prior to each check to properly determine whether the error still persists.
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