Service Guide N5227-90001 7-9
PNA Series Microwave Network Analyzers Repair and Replacement Procedures
N5227A Removing and Replacing the A1–A3 and Other Front Panel Subassemblies
Removing the Touchscreen Controller Board
1. Disconnect the touchscreen controller board cable (item
④
) from the touchscreen controller board and
front panel interface board.
2. Disconnect the flat flex cable from the touchscreen.
3. Remove two screws (item
⑩
) and remove the touchscreen controller board.
Removing the Power Switch Board and Power Button Keypad
1. Remove two screws (item ) and remove the power switch board with the cable attached.
2. 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 A3 Display Assembly and the Touchscreen
1. Disconnect the following cables from the A1 front panel interface board: display cable (item ), inverter
board cable (item
⑥), touchscreen controller board cable (item ), and power switch cable (item ).
2. Remove screws (item
⑤
) from the A3 display assembly and remove the A3 display assembly from the
front panel assembly.
3. The touch screen can now be removed from the front panel assembly. Note the orientation of the touch
screen in the front panel assembly for installation of the new touch screen.
To replace the touch screen, note the orientation of the rubber boot on the old touch screen and then
remove it and install it on the new one in the same orientation.
4. The display cable (item
) can be removed by removing the screws (item ➁) that attach it to the LCD
display hold down bracket (item
).
5. The LCD display can be removed by disconnecting the LCD cable from the inverter board and then
removing the screws (item
) that attach it to the LCD display hold down bracket (item ). Note the
location of the four spacers (item
) before separating the LCD display from the hold down bracket.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page 7-54.
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