Keysight N9038A, Service Manual

Page: 60 / 745

60 Keysight N9038A MXE Service Guide
Boot Up and Initialization
Potential Problems During Boot Process
attenuator steps are available on each of the two input attenuators. Then you
can view the troubleshooting information for the Front End Controller or
deduce from the attenuator steps that fail, which attenuator is faulty.
Assure there is no 50 MHz signal above 0 dBm applied to the instrument input when the
alignment routine is performed. This can cause errors.
Table 2-3 Alignment History Contents
Alignment Most Probably Cause Additional Information
PretuneDAC A14 LO Synthesizer A16 Reference board
provides 4.8 GHz Calibrator
signal
VCXOTuningCurve A16 Reference
VCXOLoopBandwidth A16 Reference
SecondLOTuningCurve A16 Reference
SecondLOLoopBandwidth A16 Reference
DitherLevelAlgorithm A3 Digital IF
AifLCWidePrefilterPassbandTuningAlgorithm A2 Analog IF
AifLCWidePrefilterPassbandFineTuningAlgorithm A2 Analog IF
AifLCNarrowPrefilterPassbandTuningAlgorithm A2 Analog IF
AifLCNarrowPrefilterPassbandFineTuningAlgorithm A2 Analog IF
AifXtalWidePrefilterPassbandTuningAlgorithm A2 Analog IF
AifXtalNarrowPrefilterPassbandTuningAlgorithm A2 Analog IF
AifVariableGainAlgorithm A2 Analog IF
AifStepGainAlgorithm A2 Analog IF
Aif140VariableGainAlignmentAlgorithm A25 Wideband Analog IF
LOPowerAlignmentAlgorithm A13 Front End
A15 Front End Control
AifVariableAttenuatorAlgorithm A2 Analog IF
MechanicalAttenuatorAlgorithm A9 RF Attenuator A
A10 RF Attenuator B A16 Reference provides 50
MHz Calibrator signal
ElectricalAttenuatorAlgorithm A13 Front End A16 Reference provides 50
MHz calibrator
Control signals from A15
Front End Controller