HP 8753D Option 011 Service Manual page 141

Source
Phase Lock Error Messages
The error messages listed below are usually indicative of a source failure or improper
instrument con guration. (Ensure that the R channel input is receiving at least 0 35 dBm
power). Continue with this procedure.
NO IF FOUND: CHECK R INPUT LEVEL
The rst IF was not detected during the pretune stage of phase lock.
NO PHA E LOCK: CHECK R INPUT LEVEL
The rst IF was detected at the pretune stage but phase lock could not be acquired
thereafter.
PHA E LOCK LO T
Phase-lock was acquired but then lost.
PHA E LOCK CAL FAILED
n internal phase lock calibration routine is automatically executed at power-on, when
pretune values drift, or when phase lock problems are detected.
calibration attempt.
PO IBLE FAL E LOCK
The analyzer is achieving phase lock but possibly on the wrong harmonic comb tooth.
WEEP TIME TOO FA T
The fractional-N and the digital IF circuits have lost synchronization.
4-12 Start Troubleshooting Here
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problem spoiled a
RAFT
3/21/106 15:12