8 Keysight Agile Signal Generator Service Guide
Troubleshooting
A1 Front Panel
The signal generator accepts inputs through the front panel hardkeys and the
display softkeys, and provides outputs on the front panel display and through
the RF output connector. Depending on the model, features, and options, the
front panel may have modulation input/output BNC connectors installed but
not operational (if the option associated with that connector is not installed).
When line voltage is present and the unit in standby mode, the amber LED
located at the left of the power switch lights. When the signal generator is in
power-on mode, the green LED at the left of the power switch lights.
Hardkeys/Softkeys
Some front panel keys are referred to as hardkeys and are dedicated to specific
functions. Hardkeys and the Rotary Pulse Generator (RPG) knob are used to
select the most commonly used features and to control the display contrast
and intensity. The front panel keys along the side of the LCD display are
referred to as softkeys and are used to select functions; these functions are
displayed to the left of each softkey. When a softkey is pressed, its displayed
functionality is executed. Some softkeys have multiple lower- level menus that
are displayed when the softkey is pressed. The front panel hardkeys and
softkeys use a row and column configuration. Pressing a key makes a
connection between a row and a column; the keypad controller (located on the
A1A1 Front Panel Interface assembly) interprets the pressing of each of the
front panel keys and performs the appropriate action.
Liquid Crystal Display (LCD)
The LCD provides a visual real- time updated interface between the signal
generator's settings, condition and the user. The LCD consists of a seven inch
Thin Film Transistor (TFT) RGB liquid crystal display panel. The display is a high
resolution wide viewing angle XGA panel that incorporates a white Light
Emitting Diode (LED) back- light system, polarized glare compensation, Thin-
Film Transistor (TFT) timing controller, source and gate drivers. Internal DC-
to- DC boost circuits generate gate and source driver voltages. The display is
operated with a 3.3 VDC source.
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