Chapter 5 Service
Self-Test Procedures
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| Each time the power supply is powered on, a set of |
| These tests check that the minimum set of logic and measurement hardware |
| are functioning properly. The |
| 604 and 624 through 634. |
| Complete |
| Hold any front panel key except the "Error'' key for more than 5 seconds while |
| turning on the power to perform a complete |
| when the test starts. The tests are performed in the order shown below. |
601 | Front Panel Does not respond The main controller U17 on the top board |
| attempts to establish serial communications with the front panel controller U7 |
| on the front panel board. During this test, U7 turns on all display segments. |
| Communication must function in both directions for this test to pass. If this |
| error is detected during |
| This error is only readable from the remote interface. |
602 | RAM read/write failed This test writes and reads a 55h and AAh checker |
| board pattern to each address of ram U14. Any incorrect readback will cause |
| a test failure. This error is only readable from the remote interface. |
603 | A/D sync stuck The main controller issues an A/D sync pulse to U17 and U18 |
| to latch the value in the ADC slope counters. A failure is detected when a sync |
| interrupt is not recognized and subsequent |
604 | A/D slope convergence failed The input amplifier is configured to the |
| measure zero (MZ) state in the 10 V range. This test checks whether the ADC |
| integrator produces nominally the same number of positive and negative slope |
| decisions (±10%) during a 20 ms interval. |
605 | Cannot calibrate rundown gain This test checks the nominal gain between |
| integrating ADC and the U17 |
| procedure can not run to completion due to a hardware failure. |
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