Keysight Technologies N5244/5B Service Manual page 554

Repair and Replacement Procedures
Removing and Replacing the A1–A3 and Other Front Panel Subassemblies
5. The power button keypad can now be removed from the power switch
board by gently pulling each of the rubber tabs through the PC board.
Removing the Speaker Assembly
1. Disconnect the speaker cable from the interface board.
2. Remove the speaker assembly and speaker foam.
When handling the speaker avoid touching the top of the speaker. Hold
only the sides of the speaker when re-attaching the new foam.
Avoid covering the Mounting Plate screw.
Removing the A3 Display Assembly and the Touchscreen
1. Disconnect the following cables from the A1 front panel interface board:
tape (item [14]) from connector and the LCD display to interface board
cable (item [18]), LED driver board (backlight converter board) to interface
board (item [11]), touch screen controller board to interface board cable
(item [13]), power switch board to interface board cable (item [12]), and
the speaker assembly cable.
2. Remove eleven outer screws (item
mounting plate and remove the A3 display assembly from the front panel
assembly.
3. Raise the retaining clamps on the LCD display flat flex cable's two
connectors (item [15]).
4. Disconnect the flat flex cable from the touchscreen (item [15]).
5. The LED driver board cable (item 22) can be removed from the connection
on the LCD Display.
6. The LCD display cable (item [18]) can be removed by removing the three
screws (item [17]) that attach it to the LCD display mounting bracket.
7. Remove the 3 screws on the slotted hole side of the mounting plate (item
[20]).
8. Remove the 3 screws on the round hole side of the mounting plate (item
[20]).
9. With a T-6 TORX (set to 3-in-lb), remove the 2 screws (item [23]) on the
side bracket that has the LCD cable (item [18]) attached to the LCD
display.
During re-assembly of the side brackets to the LCD display, it is very
important to avoid over-tightening.
7-14

) from the A3 display assembly's
Keysight N5244B/45B Service Guide