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 174.
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 174. 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.
Chapter 6 Service
Troubleshooting Hints
164
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