No Modulation At The Rf Output; The Power Supply Has Shut Down - Agilent Technologies E4400B User Manual

ESG Family Signal Generators Using Functions
If You Encounter a Problem

No Modulation at the RF Output?

Although you can set up and enable various modulations, the RF carrier is modulated by
the enabled modulation only when you have also set to . Check the
Mod On/Off On
annunciator on the display. If it reads , press the key once to toggle the
MOD OFF Mod On/Off
modulation on.
Can't Turn Off Sweep Mode?
In the sweep mode menu you can choose to set the sweep to various sweep types or to turn
sweep off. Press > and choose from the sweep mode selections.
Sweep/List Sweep Off
Recalled a Register and Sweep List is Missing?
Sweep information is not stored as part of the instrument state in a storage register. Only
the current step and list sweep is available to the signal generator and it cannot be stored
nor will it survive a factory preset.
All of the Registers Where You Previously Stored Instrument
States are Empty?
The save/recall registers are backed-up by a battery when AC power to the signal
generator is not connected. The battery may need to be replaced. To verify that the battery
has failed, turn off line power to the signal generator and unplug it. Then plug in the
instrument and cycle power on. If either error message −311 or −700 is stored in the error
message queue, your battery has failed. Refer to the service guide for battery replacement
instructions.
Saved an Instrument State in a Register but the Register is
Empty or Contains the Wrong State?
If you have intentionally, or unintentionally, selected a register number that is greater
than 99, the signal generator will automatically select register 99 to save your instrument
state. If the register number you intended to use is empty or contains the wrong
instrument state, recall register 99 as the instrument state may be saved there.

The Power Supply has Shut Down?

If the power supply is not working, it requires repair or replacement. There is no
user-replaceable power supply fuse. Refer to the service guide for instructions.
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User's Guide