The NI PXIe-2727 uses reed relays.
Note   The NI PXIe-2727 uses a custom lead length to meet safety standards. Trim leads per rework instructions or use one of the custom relays from the relay kit.

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

Relay Relay Manufacturer Part Number
All Relays Coto 9117-0001
Relay Kit Part Number
National Instruments (10 relays) 781451-10

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

Disassemble the Module

  1. Ground yourself using a grounding strap or a ground connected to the PXI Express chassis.
    Note   Properly grounding yourself prevents damage to your module from electrostatic discharge.
  2. Locate the relay you want to replace. Refer to the following figures and table for relay locations.

    NI PXIe 2727 Relay Map

    RelayName ReferenceDesignator RelayName ReferenceDesignator RelayName ReferenceDesignator RelayName ReferenceDesignator
    kb0shunt K1 kb4r2 K53 kb9shunt K105 kb13r2 K157
    kb0 K2 kb4r3 K54 kb9 K106 kb13r3 K158
    kbc01 K3 kb4r4 K55 kbc910 K107 kb13r4 K159
    test0 K4 kb4r5 K56 test5 K108 kb13r5 K160
    kb0r0 K5 kb4r6 K57 kb9r0 K109 kb13r6 K161
    kb0r1 K6 kb4r7 K58 kb9r1 K110 kb13r7 K162
    kb0r2 K7 kb5shunt K59 kb9r2 K111 kb14shunt K163
    kb0r3 K8 kb5 K60 kb9r3 K112 kb14 K164
    kb0r4 K9 kbc56 K61 kb9r4 K113 kbc1415 K165
    kb0r5 K10 test3 K62 kb9r5 K114 kb14r0 K166
    kb0r6 K11 kb5r0 K63 kb9r6 K115 kb14r1 K167
    kb0r7 K12 kb5r1 K64 kb9r7 K116 kb14r2 K168
    kb1shunt K13 kb5r2 K65 kb10shunt K117 kb14r3 K169
    kb1 K14 kb5r3 K66 kb10 K118 kb14r4 K170
    kbc12 K15 kb5r4 K67 kbc1011 K119 kb14r5 K171
    test1 K16 kb5r5 K68 kb10r0 K120 kb14r6 K172
    kb1r0 K17 kb5r6 K69 kb10r1 K121 kb14r7 K173
    kb1r1 K18 kb5r7 K70 kb10r2 K122 kb15shunt K174
    kb1r2 K19 kb6shunt K71 kb10r3 K123 kb15 K175
    kb1r3 K20 kb6 K72 kb10r4 K124 kbc1516 K176
    kb1r4 K21 kbc67 K73 kb10r5 K125 test8 K177
    kb1r5 K22 kb6r0 K74 kb10r6 K126 kb15r0 K178
    kb1r6 K23 kb6r1 K75 kb10r7 K127 kb15r1 K179
    kb1r7 K24 kb6r2 K76 kb11shunt K128 kb15r2 K180
    kb2shunt K25 kb6r3 K77 kb11 K129 kb15r3 K181
    kb2 K26 kb6r4 K78 kbc1112 K130 kb15r4 K182
    kbc23 K27 kb6r5 K79 test6 K131 kb15r5 K183
    kb2r0 K28 kb6r7 K80 kb11r0 K132 kb15r6 K184
    kb2r1 K29 kb6r6 K80 kb11r1 K133 kb15r7 K185
    kb2r2 K30 kb7shunt K82 kb11r2 K134 kb16shunt K186
    kb2r3 K31 kb7 K83 kb11r3 K135 kb16 K187
    kb2r4 K32 kbc78 K84 kb11r4 K136 kbc1617 K188
    kb2r5 K33 test4 K85 kb11r5 K137 kb16r0 K189
    kb2r6 K34 kb7r0 K86 kb11r6 K138 kb16r1 K190
    kb2r7 K35 kb7r1 K87 kb11r7 K139 kb16r2 K191
    kb3shunt K36 kb7r2 K88 kb12shunt K140 kb16r3 K192
    kb3 K37 kb7r3 K89 kb12 K141 kb16r4 K193
    kbc34 K38 kb7r4 K90 kbc1213 K142 kb16r5 K194
    test2 K39 kb7r5 K91 kb12r0 K143 kb16r6 K195
    kb3r0 K40 kb7r6 K92 kb12r1 K144 kb16r7 K196
    kb3r1 K41 kb7r7 K93 kb12r2 K145 kb17shunt K197
    kb3r2 K42 kb8shunt K94 kb12r3 K146 kb17 K198
    kb3r3 K43 kb8 K95 kb12r4 K147 test9 K199
    kb3r4 K44 kbc89 K96 kb12r5 K148 kb17r0 K200
    kb3r5 K45 kb8r0 K97 kb12r6 K149 kb17r1 K201
    kb3r6 K46 kb8r1 K98 kb12r7 K150 kb17r2 K202
    kb3r7 K47 kb8r2 K99 kb13shunt K151 kb17r3 K203
    kb4shunt K48 kb8r3 K100 kb13 K152 kb17r4 K204
    kb4 K49 kb8r4 K101 kbc1314 K153 kb17r5 K205
    kbc45 K50 kb8r5 K102 test7 K154 kb17r6 K206
    kb4r0 K51 kb8r6 K103 kb13r0 K155 kb17r7 K207
    kb4r1 K52 kb8r7 K104 kb13r1 K156 — —
  3. Remove the front panel, as shown in the following image.

    1 Bracket
    2 Front Panel
    3 Front Panel Overlay
    4 Screws
  4. Remove the bracket, as shown in the following image.

    1 CA3 Digital Back End
    2 Bracket
    3 Daughter Card
    4 Screws

Replace the Relay

The NI PXIe-2727 uses lead-free assemblies.

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

Make sure you have the following:

  • Temperature-regulated soldering iron set to 371 °C (700 °F) for lead-free 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

Replace the relay as you would any other through-hole part. Trim the replaced relay leads to no more than 1 mm (0.04 inch) from the PCB.

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. Refer to the Switch Soft Front Panel Help for more information.