Rear Panel Connectivity; System Memory; System Processor - Keysight n9020a Service Manual

CPU/Disk Drive Troubleshooting
A4 CPU Description

Rear Panel Connectivity

The A4 CPU board assembly has direct access to the rear panel of the
instrument. The external connections provided on the A4 CPU board assembly
include:
— External VGA
— LAN (RJ45) 10/100 based-T Ethernet port
— USB
— 4 x Type-A ports (USB 2.0 compatible)
— 1 x Type-B port (USB 2.0 compatible) MXA behaves like a USB device
(client)
— GPIB

System Memory

The type and amount of system RAM in the instrument may vary depending on
the age and options installed in an instrument.
Earlier instruments had either 1 or 2 GBytes of DDR DRAM, in either one or two
184-pin DIMM memory modules, while current instruments will have 4 GBytes
of DDR SDRAM in two 200-pin SODIMM memory modules.
While the memory controller chips do support a wide range of DDR memory
types, only memory fully qualified by Keysight Technologies is supported. Full
qualification includes mechanical vibration and shock, thermal and power
dissipation and the basic electrical characteristics.
While the A4A1 SRAM Module system memory can be obtained separate from
the A4 CPU board assembly for older instruments with the 184-pin DIMM
memory modules, the 200-pin SODIMM memory modules are not field
replaceable.
All replacement A4 CPU board assemblies come with the appropriate memory
modules installed.

System Processor

The A4 CPU board assembly uses an Intel Pentium-M series processor chip.
307