Keysight Technologies 34980A Service Manual

Also see for 34980A: User guide

Contents

Keysight Technologies 34980A Service Manual Manual pdf 69 page image

Troubleshooting and Diagnostics 4Keysight 34980A Service Guide 693 If the self test still fails, remove the internal DMM from the instrument. Theinstrument should turn on and pass self-test without the internal DMMinstalled. Disassembly procedures begin on page 113.4 Self-test errors are described beginning on page 71.Power SupplyThe main power supply provides +12 Volts. All other power supplies are derivedfrom this supply. To test the main power supply:1 Disassemble the instrument as described beginning on page 113.2 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 connectorto the communications board.a The +12 Volt supply is always on when the ac power is applied to theinstrument. Test for loading errors by unplugging the power supplyconnector 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 UpdatesAs new product features and enhancements become available, you can easilyupdate your mainframe and plug-in module firmware to ensure optimumcompatibility. The latest firmware updates are available from the Keysight 34980Aproduct page at www.Keysight.com/find/34980AUpdates.Front Panel Operation: Utility > FIRMWARE > UPDATEOnce you have downloaded the latest mainframe firmware (see above),use the knob to scroll through the installed modules that require a firmwareupdate. To exit the menu without installing the updates, select CANCEL.WARNING Exposed Mains. When the instrument cover is removed to test the powersupply, the ac mains are exposed.