681XXC OM 6-11
Signal Generator Quits During Operation
(OPERATE light remains on)
Trouble Description: The signal generator operates for some time,
then shuts down (OPERATE light remains on). After a short period, the
signal generator resumes normal operation. This is an indication that
the 681XXC has reached an excessive operating temperature.
Step 1 Check that the fan is still operating during the time that the
instrument is shut down.
q
If the fan is still operating, clean the air filter (see page
6-13).
q
If the fan is not operating, call a service technician.
LOCK ERROR is Displayed
Trouble Description: This message is displayed in the frequency pa-
rameters area to indicate that the output frequency is not phase-
locked. It is normally caused by an internal component failure.
Step 1 Perform a self-test of the signal generator by pressing the
System Menu soft-key Selftest .
q
If self-test does not result in an error message(s), resume
normal operation.
q
If an error message(s) is displayed, call a service techni
-
cian.
Table 6-4. Troubleshooting (2 of 3)
OPERATOR
MAINTENANCE TROUBLESHOOTING
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