Contents
Keysight N5221A/22A Service Guide 8
7. Repair and Replacement Procedures
Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Chapter Seven at-a-Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Personal Safety Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Electrostatic Discharge (ESD) Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Removal and Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Removing the Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Removing and Replacing the Front Panel Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Removing and Replacing the A1–A3 and Other Front Panel Subassemblies. . . . . . . . . . . 7-10
Removing and Replacing the A4–A13 Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
Removing and Replacing the A14 System Motherboard. . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18
Removing and Replacing the A15 Midplane Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
Removing and Replacing the A16 Power Supply Assembly . . . . . . . . . . . . . . . . . . . . . . . . 7-23
Removing and Replacing the A17 CPU Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 7-25
Removing and Replacing the A18 GPIB Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27
Removing and Replacing the A19 Test Set Motherboard . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29
Removing and Replacing the A20 IF Multiplexer Board . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-31
Removing and Replacing the A21 HMA26.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-33
Removing and Replacing the A22 Splitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-35
Removing and Replacing the A23 and A24 Mixer Bricks . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37
Removing and Replacing the A25–A28 Receiver Couplers and Mounting Brackets . . . . . 7-39
Removing and Replacing the A29–A32 Test Port Couplers . . . . . . . . . . . . . . . . . . . . . . . . 7-41
Removing and Replacing the A33 Reference Mixer Switch . . . . . . . . . . . . . . . . . . . . . . . . 7-43
Removing and Replacing the A34–A37 Source Attenuators, the A38–A41 Bias Tees, and the
A42–A45 Receiver Attenuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45
Removing and Replacing the A38–A41 Bias Tees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-48
Removing and Replacing the A51 Solid State Drive (SSD) . . . . . . . . . . . . . . . . . . . . . . . . . 7-50
Removing and Replacing the Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-52
Removing and Replacing the Front Panel LED Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-54
Removing and Replacing the Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56
Removing and Replacing the Lithium Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-58
Post-Repair Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-60
8. General Purpose Maintenance Procedures
Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Chapter Eight at-a-Glance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Conventions Used for Hardkeys, Softkeys, and Menu Items. . . . . . . . . . . . . . . . . . . . . . 8-1
Error Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
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