Service 6
Keysight 34970A/34972A Service Guide 175
To Replace the Power-Line Fuse
The power-line fuse is located on the rear panel of the instrument, near the power
line connector. A procedure to replace the fuse is given on page 41. Use a
500 mAT, 250 V fuse for all power line settings.
Troubleshooting Hints
This section provides a brief check list of common failures. Before troubleshooting
or repairing the instrument, make sure the failure is in the instrument rather than
any external connections. Also make sure that the instrument is accurately
calibrated within the last year (see page 66). The instrument’s circuits allow
troubleshooting and repair with basic equipment such as a 6½-digit multimeter.
Unit is Inoperative
– Verify that the AC power cord is connected to the instrument.
– Verify that the front-panel On/Standby switch has been pushed.
– Verify that the power-line fuse is installed and not open (see page 41). The
instrument is shipped from the factory with a 500 mAT,250 V fuse.
– Verify the power-line voltage setting. See “If the Instrument Does Not Turn On”
on page 41.
– Remove all plug-in modules to verify that a plug-in module is not causing the
failure.
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