Where To Begin Troubleshooting - Agilent Technologies N5242A Service Manual

PNA Series Microwave Network Analyzers
N5241A/42A

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 (optional on 2-port analyzers) 13.5 GHz source synthesizers
— A5 and A8 (optional on 2-port analyzers) sources
— A11 13.5 GHz LO synthesizer
— A21 HMA26.5
— A22 splitter
— A19 test set motherboard
• the signal separation group
— A46, A47, A48, and A49 mechanical switches (optional)
— A50 combiner (optional)
— A25, A26, A27, and A28 bridges
— A34, A35, A36, and A37 60-dB source step attenuators (optional)
— A38, A39, A40, and A41 60-dB bias tees (optional)
— 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 (optional)
— A23 and A24 mixer bricks
— A12 SPAM board
— A20 IF multiplexer board
— A19 test set motherboard
• the noise measurement group (Option 029)
— A52 and A53 test port 1 and test port 2 Option 029 switches
— A54 test port 2 Option 029 bridge
— A55 noise downconverter
— A7 noise receiver board
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.
Service Guide N5242-90001
Troubleshooting
Measurement System Troubleshooting
4-27