Keysight Technologies N5244/5B Service Manual page 129

Troubleshooting
Measurement System Troubleshooting
— the signal separation group
— the receiver group
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
1. Some PNAs have installed a legacy HMA26.5 (5087-7765) that is used with a dis-
Keysight N5244B/45B Service Guide
— 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
1
— A25 HMA26.5
— A26 splitter 1
— A70 and A75 Low Frequency Extension (LFE) board
— A23 test set motherboard
— A50, A51, A52, and A53 mechanical switches (optional)
— A54 combiner (optional)
— A29, A30, A31, and A32 reference couplers
— A38, A39, A40, and A41 60-dB source step attenuators (optional)
— A42, A43, A44, and A45 60-dB bias tees (optional)
— A71, A72, A73, or A74 bias combiner
— A33, A34, A35, and A36 test port couplers
— A23 test set motherboard
— 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
crete A26 splitter. Some PNAs have installed a new HMA26.5 (N5240-60101) with
an integrated splitter. To identify which HMA26.5 is installed in your PNA, refer to
"Verify the Model/Version of HMA26.5 Installed" on page 4-43.
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