Service
2
Keysight E3632A Service Guide
67
Self-Test Procedures
Power-on self-test
Each time the power supply is powered on, a set of self-tests are performed.
These tests check that the minimum set of logic and measurement hardware are
functioning properly. The power-on self-test performs checks, which covers from
601 through 604 and 624 through 634. For serial MY53xx6xxx, the power-on
self-test utilize the complete self-test, which covers from error codes 601 through
632.
Complete self-test
Hold any front panel key except the Error key for more than 5 seconds while
turning on the power to perform a complete self-test. The power supply beeps
when the test starts. The tests are performed in the order shown below.
Table 2-3
Self-test error messages
601
Front panel does not respond
The main controller U17 (
U10 for serial MY53xx6xxx
) attempts to establish serial communications with the
front panel controller U7 (
U602 for serial MY53xx6xxx
) on the front panel board. During this test, the U7
(
U602 for serial MY53xx6xxx
) turns on all display segments. Communication must function in both
directions for this test to pass. If this error is detected during power-on self-test, the power supply will
beep twice. 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 time-out occurs.
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.
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