5 Troubleshooting Guide
74 Keysight N1913/1914A Service Guide
Introduction
This chapter contains general troubleshooting guide to detect failures for the EPM
Series Power Meters.
Power-Up Problems
Basic external checks
– Check that the mains power source is live
– Check that the mains fuse is operational
– Check the mains cable for any obvious damage
– Check that the line module fuse in the instrument is operational
Basic internal checks
– Check/reseat the cable between the line module and the PSU
– Check/reseat the cable between the PSU and the main board
– Green LED DS1: If this is off, then the PSU may be faulty
– Green LED DS4: This should come on when the power button is pressed
– Green LEDs DS2/DS3: These will flash on and off during normal operation
Possible faults
–PSU
– Main board
– Front panel (defective keymat, key flex circuit, or display)
– Loose front panel cable (connection to main board)
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