Theory of Operation
AFG3000 Series Arbitrary/Function Generators Service Manual 3-3
Platform
CPU Board (A72)
CPU Circuit: The CPU Circuit contains an MPU, Flash RAM, and DRAM to
control the instrument. The liquid crystal controller and the USB circuit are
included in the MPU.
Local Regulators: This regulator stabilizes and supplies +3.3 V and +5.0 V for the
logic circuit.
Remote Interface: The A72 board contains a GPIB and LAN driver circuit.
Fan Controller: This circuit controls the speed of the fan.
Primary Circuit: Contains the power switch and the filter circuit.
Signal I/O Circuit: The Reference Clock Input/Output and the Modulation Input
signals are transmitted to the Generator section through this board.
Front Panel
The Front Panel controls a rubber button matrix, LED, a buzzer, and a rotary
encoder.
Power Supply
The power supply module provides +4.3 V, ±15 V, and +5 V to the circuit. This
power supply module accepts the input voltage within the range of 250 VAC from
90 VAC.
LCD
The display is a color/monochrome Quarter VGA (320 x 240) STN LCD display.
The high voltage power for LCD is supplied through the inverter. A monochrome
display is used in the AFG3021B.
Fan
A 90 mm by 90 mm size, DC 12 V type fan. It is driven by fan controller on the
CPU board.
BNC Insulator Board
(A81/ A82)
These boards insulate the I/O signal from the chassis. The A81 board is used for
the rear-panel connectors and the A82 board is used for the front-panel connectors.
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