Keysight N9912A Service Manual page 12

Safety and Regulatory Information
General Safety Considerations
No operator serviceable parts inside. Refer servicing to qualified
personnel. To prevent electrical shock, do not remove covers.
For continued protection against fire hazard, replace line fuse only
with same type and rating. The use of other fuses or material is
prohibited.
The detachable power cord is the instrument disconnecting device.
It disconnects the mains circuits from the mains supply before other
parts of the instrument. The front panel switch is only a standby
switch and is not a LINE switch (disconnecting device).
1-4 Keysight N9912A Service Guide