1-8 Service Guide N5227-90001
Safety and Regulatory Information PNA Series Microwave Network Analyzers
Regulatory Information N5227A
Lithium Battery Disposal
If the battery on the A21 CPU board assembly needs to be disposed of, dispose of it in accordance with your 
country’s requirements. If required, you may return the battery to Keysight Technologies for disposal. Refer 
to “Contacting Keysight” on page 2-6 for assistance.
For instructions on removing and replacing the battery on the A21 CPU board assembly, refer to “Removing 
and Replacing the Lithium Battery” on page 7-52.
This symbol on all primary or secondary packaging indicates compliance to China standard GB 
18455-2001.
South Korean Certification (KC) mark; includes the marking's identifier code which follows the 
format: MSIP-REM-YYY-ZZZZZZZZZZZZZZ or KCC-REM-YYY-ZZZZZZZZZZZZ.