Where To Begin Troubleshooting - Keysight N5221A 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
— A10 frequency reference
— A4 and A13 13.5 GHz source synthesizers
— A5 and A8 sources
— A11 13.5 GHz LO synthesizer
— A21 HMA26.5
— A22 splitter
— A19 test set motherboard
• the signal separation group
— A25, A26, A27, and A28 receiver couplers
— A34, A35, A36, and A37 60-dB source step attenuators
— A38, A39, A40, and A41 60-dB bias tees
— A29, A30, A31, and A32 test port couplers
— A19 test set motherboard
• the receiver group
— A33 reference mixer switch
— A42, A43, A44, and A45 35-dB receiver step attenuators
— A23 and A24 mixer bricks
— A12 SPAM board
— A20 IF multiplexer board
— A19 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 judgement 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
Service Guide N5222-90001
N5221A/22A