Technical data

Troubleshooting and Diagnostics 4
34980A Service Guide 79
Power Supply
The main power supply provides +12 Volts. All other power supplies are
derived from this supply. To test the main power supply:
1 Disassemble the instrument as described beginning on page 115.
2 Use a DVM to check that the power supply output is +12 V ± 0.6 V. 
Test the power supply output at the red leads on the power supply
connector to the communications board.
a The +12 Volt supply is always on when the ac power is applied to
the instrument. Test for loading errors by unplugging the power
supply connector from the communications board.
3 Use an oscilloscope to verify there is no ac oscillation on the +12 V
power supply.
Replace the power supply assembly if +12 V is not present.
Product Firmware Updates
As new product features and enhancements become available, you can
easily update your mainframe and plug- in module firmware to ensure
optimum compatibility. The latest firmware updates are available from the
Agilent 34980A product page at www.agilent.com/find/34980AUpdates.
Front Panel Operation: Utility > FIRMWARE > UPDATE
Once you have downloaded the latest mainframe firmware (see above), 
use the knob to scroll through the installed modules that require a
firmware update. To exit the menu without installing the updates, 
select CANCEL.
WARNING
Exposed Mains. When the instrument cover is removed to test
the power supply, the ac mains are exposed.