5-14 Keysight N9923A Service Guide
Theory of Operation
Measurement Group
5-
LAN Connector
The LAN connector supports the LAN interface on the A6 SOM board. See
for more details.
SOM Connector
Refer to
for information on SOM (System on
Module) functions.
A6 SOM Board
The A6 SOM (System on Module) board plugs directly into the A5 system board
as a daughter board and contains:
— the CPU,
— 64 MB of flash ROM,
— 128 MB of RAM,
— real time clock, and
— I/O interface.
The interfaces on the SOM are:
— UART to the System Monitor on the A5 system board
— LCD interface
— Left and right audio outputs
— SD card bus
— USB host interface
— Interface to USB hub
— LAN interface 10/100 base T
— General purpose interface lines
The A6 SOM board is powered by the 3.3 volt digital supply.
Licenses which enable instrument options are stored in the A6 SOM flash ROM.
Main Battery
The battery is a rechargeable 10.8 V lithium-ion type. Refer to
for important information about replacing and
disposing of this battery.
Refer to
“Battery Related Information” on page 5-16
for details on the main
battery.