Keysight N5227B Service Guide 4-33
Troubleshooting
Measurement System Troubleshooting
— A14 frequency reference
— A4 and A17 (A17 optional on 2-port analyzers) 13.5 GHz source
synthesizers
— A5 and A10 (A10 optional on 2-port analyzers) sources
— A15 13.5 GHz LO synthesizer
— A25 HMA26.5
— A26 splitter
— A70/A75 LFE board
— A23 test set motherboard
— the signal separation group
— A50, A51, A52, and A53 mechanical switches (optional)
— A54 combiner (optional)
— A29, A30, A31, and A32 receiver couplers
— A38, A39, A40, and A41 60-dB source step attenuators (optional)
— A42, A43, A44, and A45 60-dB bias tees (optional)
— A33, A34, A35, and A36 test port couplers
— A71, A72, A73, and A74 bias tee combiners
— A23 test set motherboard
— the receiver group
— A37 reference mixer switch
— A46, A47, A48, and A49 35-dB receiver step attenuators (optional)
— A27 and A28 mixer bricks
— A16 SPAM board
— A24 IF multiplexer board
— A23 test set motherboard
Use the list on the following pages to help you determine in which analyzer
functional group to begin troubleshooting.
This is by no means an exhaustive list of possible symptoms nor possible
failures. It is recommended that you view the system block diagram, at the end
of this chapter, as you review the entries in this list and perform any of the
troubleshooting procedures listed.
Good judgment and established logical troubleshooting techniques must be
used to complement the procedures contained in this section.
All Traces
—
If all traces are missing in all bands
, the problem is most likely in the
source group. However, a missing or disabled DSP driver may exhibit the
same or similar symptoms. To verify that this DSP driver is present and
enabled:
