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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