Phase Lock Check With Pll Di G; Raft - HP 8753D Option 011 Service Manual

Phase Lock Check with PLL IAG
Refer to \Phase Lock Diagnostic Tools" in \Source Group Troubleshooting ppendix" 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 is displayed, con rm that the analog bus is functional and perform the
NO IF FOUND
\Source Pretune Correction Constants (Test 48)" as outlined in Chapter 3, \ djustments
and Correction Constants."
If phase lock is lost in the CQUIRE state, the 11 assembly is faulty.
If phase lock is lost in the TR CK state, troubleshoot source phase lock loop components
other than the 11 assembly.
Phase Lock Check by Signal Examination
To con rm that the 11 assembly is receiving the signals required for its proper operation,
perform the following steps:
1. Place the 11 assembly on the large extender board.
2. Switch on the analyzer and press
3. Check for the signals listed in Table 7-8.
Mnemonic I/O Access
FM COIL O A11P1-3,33
REF I A11TP9
YO COIL + O A11P1-2,32
YO COIL O A11P1-1,31
1ST IF I A11 PL IF IN
7-32 Source Troubleshooting
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RESET
5
Table 7-8. A11 Input Signals
ee
Figure
Figure 7-27 Aids YO COIL in setting YIG. Press PRESET
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UMBER OF POI TS
Figure 7-9, Observe both low band and high band CW frequencies.
Figure 7-10
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Figure 7-7 Use
SOURCE PLL OFF
Figure 7-7
Figure 7-26 Check for 1 MHz with tee a A11 jack (not at cable end) in high band.
Notes
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MENU
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to observe this signal.
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RAFT