NI PXI-2529 Relay Replacement

The NI PXI-2529 uses electromechanical armature relays.

Refer to the following table for information about ordering replacement relays.

Relay Manufacturer	Part
Aromat (NAiS)	AGQ210A4H

Complete the following sets of steps to disassemble your module, replace a failed relay, and reassemble your module.

Disassemble the Module

1. Ground yourself using a grounding strap or a ground connected to your PXI chassis.

   Note  Properly grounding yourself prevents damage to your module from electrostatic discharge.

2. Locate the relay you want to replace.
   1. Determine the channel name for the relay using the Bank Connection Diagram for your topology.
   2. Match the channel name to its corresponding relay name using the following tables.

      Daughterboard Relay Locations (Top View)

      Channel Name	Relay Name	Channel Name	Relay Name	Channel Name	Relay Name	Channel Name	Relay Name
      B0ROC0	K72	B0R1C0	K80	B0R2CO	K88	B0R3C0	K96
      B0ROC1	K71	B0R1C1	K79	B0R2C1	K87	B0R3C1	K95
      B0ROC2	K70	B0R1C2	K78	B0R2C2	K86	B0R3C2	K94
      B0ROC3	K69	B0R1C3	K77	B0R2C3	K85	B0R3C3	K93
      B0ROC4	K1	B0R1C4	K9	B0R2C4	K17	B0R3C4	K25
      B0ROC5	K2	B0R1C5	K10	B0R2C5	K18	B0R3C5	K26
      B0ROC6	K3	B0R1C6	K11	B0R2C6	K19	B0R3C6	K27
      B0ROC7	K4	B0R1C7	K12	B0R2C7	K20	B0R3C7	K28
      B0ROC8	K68	B0R1C8	K76	B0R2C8	K84	B0R3C8	K92
      B0ROC9	K67	B0R1C9	K75	B0R2C9	K83	B0R3C9	K91
      B0ROC10	K66	B0R1C10	K74	B0R2C10	K82	B0R3C10	K90
      B0ROC11	K65	B0R1C11	K73	B0R2C11	K81	B0R3C11	K89
      B0ROC12	K5	B0R1C12	K13	B0R2C12	K21	B0R3C12	K29
      B0ROC13	K6	B0R1C13	K14	B0R2C13	K22	B0R3C13	K30
      B0ROC14	K7	B0R1C14	K15	B0R2C14	K23	B0R3C14	K31
      B0ROC15	K8	B0R1C15	K16	B0R2C15	K24	B0R3C15	K32

      Daughterboard Relay Locations (Bottom View)

      Channel Name	Relay Name	Channel Name	Relay Name	Channel Name	Relay Name	Channel Name	Relay Name
      B1ROC0	K104	B1R1C0	K112	B1R2CO	K120	B1R3C0	K128
      B1ROC1	K103	B1R1C1	K111	B1R2C1	K119	B1R3C1	K127
      B1ROC2	K102	B1R1C2	K110	B1R2C2	K118	B1R3C2	K126
      B1ROC3	K101	B1R1C3	K109	B1R2C3	K117	B1R3C3	K125
      B1ROC4	K33	B1R1C4	K41	B1R2C4	K49	B1R3C4	K57
      B1ROC5	K34	B1R1C5	K42	B1R2C5	K50	B1R3C5	K58
      B1ROC6	K35	B1R1C6	K43	B1R2C6	K51	B1R3C6	K59
      B1ROC7	K36	B1R1C7	K44	B1R2C7	K52	B1R3C7	K60
      B1ROC8	K100	B1R1C8	K108	B1R2C8	K116	B1R3C8	K124
      B1ROC9	K99	B1R1C9	K107	B1R2C9	K115	B1R3C9	K123
      B1ROC10	K98	B1R1C10	K106	B1R2C10	K114	B1R3C10	K122
      B1ROC11	K97	B1R1C11	K105	B1R2C11	K113	B1R3C11	K121
      B1ROC12	K37	B1R1C12	K45	B1R2C12	K53	B1R3C12	K61
      B1ROC13	K38	B1R1C13	K46	B1R2C13	K54	B1R3C13	K62
      B1ROC14	K39	B1R1C14	K47	B1R2C14	K55	B1R3C14	K63
      B1ROC15	K40	B1R1C15	K48	B1R2C15	K56	B1R3C15	K64

   3. Use the relay name to locate the relay on the daughterboard.

      Note  Relay names are printed on the PCB.

3. To replace relay K1, K8, K9, K16, K17, K24, K25, K32, K33, K40, K41, K48, K49, K56, K57, or K64, remove the four screws and two lead covers that secure the daughterboard to the switch assembly.
   
   

   1 Screws 2 Lead Covers 3 Daughterboard

4. To gain access the bottom of the daughterboard, disconnect the PCB interconnect cable by lifting the PCB cable latch on the J1 connector.
   
   

   1 PCB Interconnect Cable 2 PCB Cable Latch 3 J1 Connector

Replace the Relay

Make sure you have the following:

• Temperature-regulated soldering iron set to 300 °C
• 60/40 Lead/Tin solder (flux core)
• Solder wick
• Fine pick
• Isopropyl alcohol
• Cotton swabs

If you have a surface mount rework station, replace the relay as you would any other surface mount part. Otherwise, complete the following steps to replace the relay:

1. Use the soldering iron and solder wick to remove as much solder from the relay pads as possible. Do not leave the soldering iron on any lead for more than 5 seconds.

   Note  If it is necessary to reapply the soldering iron to the pad, allow the connection to cool completely before reapplying the soldering iron.

2. Apply heat to the pads one at a time, and use the pick to gently pry the relay pins from the pads. Make sure that the solder is molten before prying.

   Caution  Using excessive force on a soldered pad can result in lifting the PCB trace and ruining the daughterboard.

3. Remove the relay.
4. Clean the pads with isopropyl alcohol and cotton swabs.
5. Place the new relay on the PCB pads and solder.
6. Remove the excess flux with isopropyl alcohol and cotton swabs.

   Caution  Do not use flux remover to clean the board after relay replacement.

Reassemble the Module

Complete the Disassemble the Module steps in reverse order to reassemble your module.

Tip  In NI-SWITCH 3.1 or later, you can use the Switch Soft Front panel to reset the relay count after you have replaced a failed relay.