74 N9030B PXA Signal Analyzer Service Guide
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Table 2-3 Initial Alignments
Alignment Description Most Probable
Hard ware Failure
Related Hard ware
Main Loop YTO Pretune DAC A14 Synthesizer A16 Reference board is not
providing correct 100 MHz
or 4.8 GHz signals.
A20 YTO output power low.
Offset Loop VCO Pretune Alignment A14 Synthesizer A16 Reference board is not
providing correct 100 MHz
or 4.8 GHz signals
VCXO Tuning Curve
(Power up alignment only)
Measures the tuning voltage for the 100 MHz
VCO at a number of different frequencies. Uses
internal 10 MHz time base
A16 Reference
VCXO Loop Band wid th
Adjusts gain of the PLL loop amplifier. Uses the
10 MHz internal reference
A16 Reference
Second LO Tuning Curve
(Power up alignment only)
Measures the tune voltage for the 4800 MHz
VCO at a number of different frequencies. Uses
the 10 MHz internal reference
A16 Reference
Second LO Loop Band wid th
Adjusts gain of the PLL loop amplifier. Uses the
10 MHz internal reference.
A16 Reference
Ext Mix LO Alignment Algorithm A13 Front End Assy A15 Front End Controller
Dither Level Algorithm
(4 measurements)
A3 Digital IF
AIF LC Wide Prefilter Passband Tuning
Algorithm
Adjusts the LC prefilter centering with the
prefilter BW set to about 1.12 MHz.
Uses 322.5 MHz Comb Calibrator on the A-IF.
A2 Analog IF
AIF LC Wide Prefilter Passband Fine Tuning
Algorithm
A2 Analog IF
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