Keysight Technologies DAQ970A Service Manual page 22

1 Service and Repair
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.
– Remove all plug-in modules to verify that a plug-in module is not causing the
Unit fails power-on self-test
Remove all plug-in modules and cycle the instrument's power again. If the
instrument does not show a failure, replace or troubleshoot the plug-in module.
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.
A list of all error codes can be found in the DAQ970A/DAQ973A Programming
Guide.
Isolating to an assembly
– Remove all plug-in modules to isolate between the instrument and the plug-in
– Listen for the fan when you press the [On/Standby] switch. Fan operation
– Try to operate the instrument from a remote interface. If remote operations are
22
failure.
modules.
indicates some operation of the main controller and power supplies.
normal, the display should be replaced or repaired.
Keysight DAQ970A/DAQ973A Service Guide