HP 8753E Service Manual page 212

6. Observe the analyzer for the results of the routine:
If the analyzer displays the message Serial Cor DONE, you have
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completed this procedure.
If the analyzer does not display DONE, then either the serial number that
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you entered in steps 3 and 4 did not match the required format or a serial
number was already stored. Check the serial number recognized by the
analyzer:
b. Look for the serial number displayed on the analyzer screen.
c. Rerun this adjustment test.
If the analyzer continues to fail this adjustment routine, contact your
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nearest HP sales or service office.
Adjustments and Correction Constants