The PXIe-2739 uses electromechanical armature relays.

Replacement Relay Part
Tyco Electronics 5-1462039-8
National Instruments (10 relays) 781089-10

Complete the following steps to disassemble the PXIe-2739 module, replace a failed relay, and reassemble the PXIe-2739.

Locate the Relay

  1. Ground yourself using a grounding strap or a ground connected to your PXI Express chassis.
    Note Properly grounding yourself prevents damage to your module from electrostatic discharge.
  2. Locate the relay you want to replace.
    1. Match the channel name to its corresponding relay name.
    2. Match the relay name with its reference designator using the tables below.
      Note Reference designators are printed on the PCB.

PCB 1 - Motherboard



PCB 2 - Daughterboard



PCB 1 Relay Locations

Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator
kr0c0 K1 kr2c0 K5 kr4c0 K65 kr6c0 K69
kr0c1 K2 kr2c1 K6 kr4c1 K66 kr6c1 K70
kr0c2 K9 kr2c2 K13 kr4c2 K73 kr6c2 K77
kr0c3 K10 kr2c3 K14 kr4c3 K74 kr6c3 K78
kr0c4 K17 kr2c4 K21 kr4c4 K81 kr6c4 K85
kr0c5 K18 kr2c5 K22 kr4c5 K82 kr6c5 K86
kr0c6 K25 kr2c6 K29 kr4c6 K89 kr6c6 K93
kr0c7 K26 kr2c7 K30 kr4c7 K90 kr6c7 K94
kr0c8 K33 kr2c8 K37 kr4c8 K97 kr6c8 K101
kr0c9 K34 kr2c9 K38 kr4c9 K98 kr6c9 K102
kr0c10 K41 kr2c10 K45 kr4c10 K105 kr6c10 K109
kr0c11 K42 kr2c11 K46 kr4c11 K106 kr6c11 K110
kr0c12 K49 kr2c12 K53 kr5c0 K67 kr7c0 K71
kr0c13 K50 kr2c13 K54 kr5c1 K68 kr7c1 K72
kr0c14 K57 kr2c14 K61 kr5c2 K75 kr7c2 K79
kr0c15 K58 kr2c15 K62 kr5c3 K76 kr7c3 K80
kr1c0 K3 kr3c0 K7 kr5c4 K83 kr7c4 K87
kr1c1 K4 kr3c1 K8 kr5c5 K84 kr7c5 K88
kr1c2 K11 kr3c2 K15 kr5c6 K91 kr7c6 K95
kr1c3 K12 kr3c3 K16 kr5c7 K92 kr7c7 K96
kr1c4 K19 kr3c4 K23 kr5c8 K99 kr7c8 K103
kr1c5 K20 kr3c5 K24 kr5c9 K100 kr7c9 K104
kr1c6 K27 kr3c6 K31 kr5c10 K107 kr7c10 K111
kr1c7 K28 kr3c7 K32 kr5c11 K108 kr7c11 K112
kr1c8 K35 kr3c8 K39
kr1c9 K36 kr3c9 K40
kr1c10 K43 kr3c10 K47
kr1c11 K44 kr3c11 K48
kr1c12 K51 kr3c12 K55
kr1c13 K52 kr3c13 K56
kr1c14 K59 kr3c14 K63
kr1c15 K60 kr3c15 K64

PCB 2 Relay Locations

Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator
kr4c12 K11 kr8c0 K33 kr10c0 K29 kr12c0 K69 kr14c0 K65
kr4c13 K10 kr8c1 K32 kr10c1 K28 kr12c1 K68 kr14c1 K64
kr4c14 K22 kr8c2 K44 kr10c2 K40 kr12c2 K80 kr14c2 K76
kr4c15 K21 kr8c3 K43 kr10c3 K39 kr12c3 K79 kr14c3 K75
kr5c12 K9 kr8c4 K55 kr10c4 K51 kr12c4 K91 kr14c4 K87
kr5c13 K8 kr8c5 K54 kr10c5 K50 kr12c5 K90 kr14c5 K86
kr5c14 K20 kr8c6 K3 kr10c6 K1 kr12c6 K102 kr14c6 K98
kr5c15 K19 kr8c7 K14 kr10c7 K12 kr12c7 K101 kr14c7 K97
kr6c12 K7 kr8c8 K25 kr10c8 K23 kr12c8 K113 kr14c8 K109
kr6c13 K6 kr8c9 K36 kr10c9 K34 kr12c9 K112 kr14c9 K108
kr6c14 K18 kr8c10 K47 kr10c10 K45 kr12c10 K124 kr14c10 K120
kr6c15 K17 kr8c11 K58 kr10c11 K56 kr12c11 K123 kr14c11 K119
kr7c12 K5 kr8c12 K61 kr10c12 K59 kr12c12 K135 kr14c12 K131
kr7c13 K4 kr8c13 K72 kr10c13 K70 kr12c13 K134 kr14c13 K130
kr7c14 K16 kr8c14 K83 kr10c14 K81 kr12c14 K144 kr14c14 K140
kr7c15 K15 kr8c15 K94 kr10c15 K92 kr12c15 K143 kr14c15 K139
kr9c0 K31 kr11c0 K27 kr13c0 K67 kr15c0 K63
kr9c1 K30 kr11c1 K26 kr13c1 K66 kr15c1 K62
kr9c2 K42 kr11c2 K38 kr13c2 K78 kr15c2 K74
kr9c3 K41 kr11c3 K37 kr13c3 K77 kr15c3 K73
kr9c4 K53 kr11c4 K49 kr13c4 K89 kr15c4 K85
kr9c5 K52 kr11c5 K48 kr13c5 K88 kr15c5 K84
kr9c6 K2 kr11c6 K127 kr13c6 K100 kr15c6 K96
kr9c7 K13 kr11c7 K126 kr13c7 K99 kr15c7 K95
kr9c8 K24 kr11c8 K116 kr13c8 K111 kr15c8 K107
kr9c9 K35 kr11c9 K115 kr13c9 K110 kr15c9 K106
kr9c10 K46 kr11c10 K105 kr13c10 K122 kr15c10 K118
kr9c11 K57 kr11c11 K136 kr13c11 K121 kr15c11 K117
kr9c12 K60 kr11c12 K125 kr13c12 K133 kr15c12 K129
kr9c13 K71 kr11c13 K114 kr13c13 K132 kr15c13 K128
kr9c14 K82 kr11c14 K103 kr13c14 K142 kr15c14 K138
kr9c15 K93 kr11c15 K104 kr13c15 K141 kr15c15 K137

Disassemble the Module

  1. Remove the four screws that secure PCB 2 to the switch assembly.
  2. Gently separate PCB 1 and PCB 2.

Replace the Relay

Note NI recommends using lead-free solder for relay replacement on lead-free assemblies, and lead solder for relay replacement on lead assemblies.
Note Do not rework lead assemblies using a lead-free work station. Lead solder from the unit could contaminate the station.
Note If a lead-free assembly is reworked with lead solder, label the assembly to indicate this condition. This rework can prevent the same unit from being reworked later on a lead-free solder station, because it could contaminate the station.

Verify that you have the following items:

  • Temperature-regulated soldering iron set to 316 °C (600 °F) for lead solder rework or 371 °C (700 °F) for lead-free solder rework
  • 63/37 Tin/Lead solder (flux core) for lead solder rework
  • 96.5/3.0/0.5 Tin/Silver/Copper solder (flux core) for lead-free solder rework
  • 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. Locate the assembly and serial number labels on the board with the relay you want to replace. White labels indicate the board was assembled using lead solder (Sn 63 Pb 37). Green labels indicate the board was assembled using lead-free solder (Sn 96.5 Ag 3.0 Cu 0.5). Lead-free assemblies have assembly numbers ending in L.
  2. Replace the relay as you would any other through-hole part. Trim the replaced relay to no more than 0.41 mm (0.016 inch) from the PCB.

Reassemble the Module

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

Note 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. Refer to the NI-SWITCH Soft Front Panel for more information