Source Group Troubleshooting Appendix; Troubleshooting Source Problems With The Analog Bus; Phase Lock Diagnostic Tools; Phase Lock Error Messages - HP 8753E Service Manual

Source Group Troubleshooting Appendix

Troubleshooting Source Problems with the Analog Bus

The analog bus can perform a variety of fast checks, However, it too is subject
to failure and thus should be tested prior to use. You should have done this in
Chapter 4, "Start Troubleshooting Here. n
lb use the analog bus to check anv one of the nodes. Dress I I
and enter the analog bus node number followed by Lxl]. Refer to "Analog
Bus" in Chapter 10, "Service Key Menus and Error Messages", for additional
information.

Phase Lock Diagnostic Tools

error messages
n
diagnostic routines
n

Phase Lock Error Messages

All phase lock error messages can result from improper front panel connections.
NO IF FOUND : CHECK R INPUT LEVEL means no IF was detected during pretune:
a source problem. Perform the "A4 Sampler/Mixer Check".
NO PHASE LOCK : CHECK R INPUT LEVEL means the IF was not acquired after
pretune: a source problem. Perform the "A4 Sampler/Mixer Check", earlier in
this chapter.
PHASE LOCK CAL FAILED means that a calculation of prettme values was not
successful: a source or receiver failure. Perform the "Source Prettme Correction
Constants" routine as outlined in Chapter 3, "Adjustments and Correction
Constants" If the analyzer fails that routine, perform the "A4 Sampler/Mixer
Check".
PHASE LOCK LOST means that phase lock was lost or interrupted before the band
sweep ended: a source problem. Refer to "Phase Lock Diagnostic Routines"
next to access the phase lock loop diagnostic service routine. Then troubleshoot
the problem by following the procedures in this chapter.
7-38 Source Troubleshooting