Assembly Overview; Power Switch; Display; Keyboard - Keysight Technologies X Series Service Manual

Front Panel Assembly

Assembly Overview

Assembly Overview
The A6 Front Panel assembly contains most of the user interface to the
instrument. This includes the:

— Power Switch

— Display

— Keyboard

— USB Interface
— Front Panel Interface
Power Switch
The front panel power switch is a momentary switch that is located on the
A6A3 Power Switch assembly. The power switch is used to toggle the power
control circuitry on the A3 RF assembly. Except when being pressed, the power
switch is always open.
There are also two LEDs located on the A6A3 Power Switch assembly. The
yellow LED is used to indicate that the instrument status is standby. The green
LED is used to indicate that the instrument status is on. Both LEDs are driven
by the same control circuit on the A3 RF assembly and there should never be a
condition in which they would both be on at the same time.
The A6A3 Power Switch assembly connects to the A6A1 Front Panel Interface
board via cable harness W38.
Display
The A6A5 Display assembly is a 6.2-inch liquid crystal display (LCD) with a
resolution of 640 x 240 (½ VGA). The display has a white Light Emitting Diode
(LED) backlight system and polarized glare compensation.
The LVDS to RGB drive circuitry for the LCD, as well as the backlight control
voltage, are located on the A6A1 Front Panel Interface board.
The A6A5 Display LCD assembly connects to the A6A1 Front Panel Interface
board via ribbon cable W37.
Keyboard
The A6A4 Keyboard assembly contains a series of front panel hardkeys and
softkeys that use a row and column configuration. There are 8 rows and 7
columns and pressing a key makes a connection between a row and a column.
The keypad controller located on the A6A1 Front Panel Interface board scans
and interprets the pressing of each of the front panel keys. The interpreted key
press information is routed to the A5 CPU assembly via the USB hub located on
the A6A1 Front Panel Interface board.
158 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide