HP 8753E Service Manual page 219

At the end of a successful loading, the LEDs for Channel 1 and Testport 1
will remain on and the display will turn on indicating the version of lirmware
that was loaded.
If the firmware did not load successfully, LED patterns on the front panel can
help you isolate the problem.
If the following LED pattern is present, the firmware disk is not for use with
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your instrument model. Check that the firmware disk used was for the
HP 8753E.
If any of the following LED patterns are present,
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defective.
If any other LED pattern is present, the CPU board is defective.
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3 4 2 Adjustments and Correction Constants
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the firmware disk may be