Agilent 34970A/34972A Data Acquisition / Switch Unit

Chapter 6 Service
Troubleshooting Hints
Unit Reports Error 705
This error may be produced if you accidentally turn off power to the unit
during a calibration or while changing a non-volatile state of the
instrument. Recalibration or resetting the state should clear the error. If
the error persists, a hardware failure may have occurred.
Isolating to an Assembly
• Remove all plug-in modules to isolate between the instrument and
the plug-in modules.
• Listen for a beep when you press the On/Standby switch. The main
controller can operate the beeper even with a display failure.
• Listen for the fan when you press the On/Standby switch. Fan
operation indicates some operation of the main controller and power
supplies.
• Try to operate the instrument from a remote interface. If remote
operations are normal, the display should be replaced or repaired.
• Isolate the internal DMM by removing it. The instrument should
operate and pass self-test without the internal DMM installed.
Disassembly procedures start on page 183.
Unit Fails Self-Test
• Verify that the correct power-line voltage setting is selected.
• Remove all plug-in modules and run self-test again. If the instrument
does not show a failure, replace or troubleshoot the plug-in module.
• To isolate the internal DMM, disassemble the instrument and remove
the internal DMM. Disassembly procedures start on page 183. Run
self-test again. If the self-test passes, troubleshoot or replace the
Internal DMM. If the self-test fails, troubleshoot or replace the
34970A/34972A.
174