Where To Begin Troubleshooting - Keysight N5224A Service Manual

Troubleshooting
Measurement System Troubleshooting

Where to Begin Troubleshooting

For the purposes of troubleshooting, the analyzer block diagram is divided into the following functional
groups:
• the source and LO group
— A14 frequency reference
— A4 and A17 13.5 GHz source synthesizers
— A5 and A10 sources
— A15 13.5 GHz LO synthesizer
— A25 HMA26.5
— A26 splitter
— A23 test set motherboard
• the signal separation group
— A29, A30, A31, and A32 receiver couplers
— A38, A39, A40, and A41 60-dB source step attenuators
— A42, A43, A44, and A45 60-dB bias tees
— A33, A34, A35, and A36 test port couplers
— A23 test set motherboard
• the receiver group
— A37 reference mixer switch
— A46, A47, A48, and A49 35-dB receiver step attenuators
— 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.
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PNA Series Microwave Network Analyzers
N5224A and N5225A
Service Guide N5225-90001