Chapter 5 Service
Self-Test Procedures
105
5
606
Rundown gain out of range
This test checks the nominal gain between the
integrating ADC and the U19 on-chip ADC. T he nominal gain is checked to
±10% tolerance.
607 Rundown too n oisy
This test checks the gain repeatabil ity between the
integrating ADC and the U19 on-chip ADC. T he gain test (606) is performed
eight times. Gain noise must be less that ±64 lsb’s of the U19 on-chip ADC.
608 Serial configuration readback failed
This test re-sends the last 3 byte serial
configuration data to all the serial path (SERDAT, SERBCK, SERCLK). The
data is then clocked back into U20 and compared against the original 3 bytes
sent. A failure occurs if t he data do not match. This tests checks the serial data
path through U23.
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 and U1 through the optically isola ted (U2 and U5)
serial data link. Failu re to establish communication in either direction will
generate an error. If this condition is detect ed 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 caus es the ear th referenced
processor U1 to execute an internal, ram test. Fai lure wi ll 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, t he power supply will beep and the error
annunciator will be on. F an test fail could likely induce overtemperature
condition in the power supply.
63 1 System DAC test failed
This t est checks if the DAC hardware is functional.
The main controller U19 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
Hardware test failed
This test checks the status of voltage and current error
amplifiers for the power cir cu it. If both amplifiers are not operational, the
power supply will beep and the error annunciator will be on.
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