Phase Lock Check With Pll Diag - HP 8753E Service Manual

Phase Lock Check with PLL DIAG

Refer to "Phase Lock Diagnostic Tools" in "Source Group Troubleshooting
Appendix" at the end of this chapter for an explanation of the error messages
and the diagnostic routines. Follow the steps there to determine in which state
the phase lock is lost.
If NO IF FOUND is displayed, con&m that the analog bus is functional and
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perform the "Source Pretune Correction Constants (Test 48)" as outlined in
Chapter 3, "Adjustments and Correction Constants."
If phase lock is lost in the ACQUIRE state, the A11 assembly is faulty
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If phase lock is lost in the TRACK state, troubleshoot source phase lock loop
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components other than the A11 assembly.
Phase Lock Check by Signa l
operation, perform the following steps.
1. Place the A11 assembly on the large extender board.
2. Switch on the analyzer and press Ipreset).
3. Check for the signals listed in 'Ihble 7-8.
Mnemonic II0
0
I
0
0
I
Examination
Observe both low band and high band CW frequencies.
Check for 1 MHz with tee a All jack (not at cable end) ir
high band.