Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent N5230-90025 Service Guide_252C N5230C Options 145_252C 146_252C 245_252C & 246_252C 4-Port PNA-L Series Microwave Network Analyzers c20140115 [200]
Most service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download
Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing.
If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.