Keysight 9000 Series Service Manual page 127

Chapter 7: Theory of Operation
Block-Level Theory
Motherboard
The motherboard provides all system control and interface functions for the oscilloscope. It contains a
CPU, ROM, and RAM; keyboard and mouse interfaces, serial and parallel interfaces, CDROM, hard
disk drive interface, PCI buses, etc.
Display Board
The Display Board controls the flat-panel display monitor. It translates the video signals from the
motherboard's on-board video system to the Low Voltage Differential Signal (LVDS) signals that drive
the monitor.
System Fans
There are five fans: two larger fans that draw air out of the rear of the instrument, two medium fans that
are positioned over each ADC to give additional cooling, and one small fan positioned over the trigger
IC. They are all controlled by the main FPGA.
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