Troubleshooting Guide 5
Keysight N1913/1914A Service Guide 77
Communication Interface Failures
Additional Diagnostic Tests
Type of communication Debug tips Possible faults
GPIB communication Check/reseat the ribbon cable
connecting the PPMC to the main board
Ribbon cable (low probability)
Main board (high probability)
LAN/USB communication Check visually to see whether or not the
connector is obstructed/damaged
PPMC assembly
Type of functionality Reason Recommended test method Possible faults
USB/LAN functionality The N7800 Series software only tests
functionality over GPIB
Check the DUT responds when *RST
is sent to it via the USB/LAN
interfaces
PPMC assembly
Sensor functionality The N7800 Series software does not
prove both paths of the sensor flex
assembly
Connect an E4412A sensor to the
DUT and ensure it can be zeroed/
calibrated
Sensor flex assembly
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