7-10 Service Guide N5230-90014
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing Front Panel Subassemblies N5230A
Removing and Replacing Front Panel Subassemblies
Tools Required
• T-10 TORX driver (set to 9 in-lb)
• T-20 TORX driver (set to 21 in-lb)
• 5/16 inch open-end torque wrench (set to 10 in-lb)
• ESD grounding wrist strap
Refer to Figure 7-3 for the following procedures.
Pre-removal Procedure
1. Disconnect the power cord.
2. Remove the front panel assembly. Refer to “Removing and Replacing the Front Panel
Assembly” on page 7-8.
3. Disconnect the display ribbon cable (item
①
) and the display lamp cable (item
②
) from
the A3 front panel interface board.
Removing the A2 Display Assembly
1. With a T-10 TORX driver, remove the four retaining screws (item
③
) from the display
assembly.
2. Remove the display assembly from the front panel.
Removing the A3 Front Panel Interface Board
1. Remove the round knob (RPG) from the front panel by gently pulling the knob forward.
2. With a T-10 TORX driver, remove the seven screws (item
④
) from the front panel
interface board.
3. From the bottom of the frame, lift the A3 front panel interface board up at an angle
until the board clears the frame. Disconnect the keypad ribbon cable (item
⑤
) from the
A3 front panel interface board and lift out the board.
Removing the A1 Keypad Assembly
1. Remove the A3 front panel interface board as instructed above.
2. From the rear of the front panel assembly, remove the center retaining screw (item
⑥
).
Bend the bottom keypad assembly tabs away from the frame and push the A1 keypad
assembly out of the frame.
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