
Chapter 5 Service
606 | Rundown gain out of range This test checks the nominal gain between the |
| integrating ADC and the U17 |
| ±10% tolerance. |
607 | Rundown too noisy This test checks the gain repeatability between the |
| integrating ADC and the U17 |
| eight times. Gain noise must be less that ±64 lsb's of the U17 |
608 | Serial configuration readback failed This test |
| serial configuration data to all the serial path (SERDAT, SERBCK, SERCLK). |
| The data is then clocked back into U18 on the top board and compared against |
| the original 3 bytes sent. A failure occurs if the data do not match. This tests |
| checks the serial data path through U22. |
624 | Unable to sense line frequency This test checks that the LSENCE logic |
| input U17 is togging. 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 U17 and U4 through the optically isolated (U6 and U7) |
| serial data link. Failure to establish communication in either direction will |
| generate an error. If this condition is detected at |
| supply will beep and the error annunciator will be on. |
626 | I/O processor failed |
| processor U4 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 |
| 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 U17 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 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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