Service 5
Keysight E3633A and E3634A Service Guide 121
624
Unable to sense line frequency
This test checks that the LSENCE logic input U19 is toggling. If no logic input
detected, the power supply will assume a 50 Hz line operation for all future
measurements.
625
I/O processor did not respond
This test checks that communications can be established between U19 (U101 for
serial MY53xx6xxx) and U1 (U802 for serial MY53xx6xxx) through the isolated
(U2 and U5) (U801 for serial MY53xx6xxx) serial data link. Failure to establish
communication in either direction will generate an error. If this condition is
detected at power-on self-test, the power supply will beep and the error
annunciator will be on.
626
I/O processor failed self-test
This test causes the earth referenced processor U1 (U802 for serial MY53xx6xxx)
to execute an internal, ram test. Failure will generate an error.
630
Fan test failed
This test checks if the fan current is flowing. If the current is not detected at
power-on self-test, the power supply will beep and the error annunciator will be
on. Fan test fail could likely induce overtemperature condition in the power
supply.
631
System DAC test failed
This test checks if the DAC hardware is functional. The main controller U19
(U101 for serial MY53xx6xxx) sends a reference voltage data to DAC and
converts the DAC output to digital data to see if the digital data is within a valid
range.
632
Hard ware test failed
This test checks the status of voltage and current error amplifiers for the power
circuit. If both amplifiers are not operational, the power supply will beep and the
error annunciator will be on.
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