Keysight N9038A, Service Manual, Page: 382 / 745

382 Keysight N9038A MXE Service Guide
Motherboard & Front Panel
A1 Front Panel Assembly
A1 Front Panel Assembly
The major components of the A1 Front Frame Assembly are the A1A2 Front
Panel Interface Board, A1A3 LCD, A1A4 Backlight Power Supply Board, and
the A1A5 Front Panel Daughter Board, all of which are serviceable as individual
components.
The A1 assembly is used to display the measurement results, accept user input
via the keyboard, and connect USB peripheral devices.
A1A2 Front Panel Interface Board
The A1A2 Front Panel Interface board is serviced as an assembly only; no
component level repair is supported.
The Front Panel Interface Board contains LCD control, backlight drive, audio
amplifiers, internal speaker, a 4 port USB hub, and a USB keyboard
microcontroller.
The two different front panel rubber keypads attach to the back side of the
board, which has the keyboard contacts printed on the reverse side.
The 4 ports from the USB hub contained on this board go to the 2 front panel
USB connectors, the keyboard microcontroller, and the fourth port is unused.
A1A3 LCD
The LCD used is an 8.4inch XGA TFT display, which has a resolution of
1024 x 768.
A1A4 Backlight Power Supply
The backlight power supply board provides the voltage required by the LCD
backlights.
A1A5 Front Panel Daughter Board
The Front Panel Daughter Board provides the front panel USB connections as
well as the headphone jack, probe power, and RF Input 1 LED.