Troubleshooting and Diagnostics 4
34980A Service Guide 81
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 117.
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.
Exposed Mains. When the instrument cover is removed to test
the power supply, the ac mains are exposed.
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