NI SCXI-1130 Relay Replacement

The NI SCXI-1130 uses electromechanical reed relays.

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

Relay Manufacturer	Part
Meder	MS05-1A71-75DHR

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

Disassemble the Switch Module

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

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

2. Remove the three rear screws from the back of the switch module.
3. Carefully remove the top cover of the switch module using a flathead screwdriver.
4. Remove the rear panel.
   
   

   1 Rear Screws 2 Top Cover 3 Rear Panel

5. Remove the four screws holding the front connectors and the daughterboard assemblies to the front panel.
   
   

   1 Screws

6. Remove the daughterboard assembly interconnect flat cable.




1 Interconnect Flat Cable 2 Relay Driver Chips 3 Back Daughterboard 4 Top Daughterboard Assembly 5 Front Daughterboard

7. Refer to the following figures to locate the relay you want to replace.

   Note  The NI SCXI-1130 has two daughterboard assemblies: a top daughterboard assembly and a bottom daughterboard assembly. The top daughterboard assembly is circled in the figure above. Both top and bottom daughterboard assemblies are comprised of two daughterboards: a front daughterboard and a back daughterboard. The relay driver chips are attached to the front daughterboards.

   Back Daughterboard, Top Assembly

   Front Daughterboard, Top Assembly

   Back Daughterboard, Bottom Assembly

   Front Daughterboard, Bottom Assembly

8. Remove the four screws that secure the daughterboard assembly to the switch assembly.
9. Remove the insulator and spacers that separate the front and back daughterboards.
   
   

   1 Screws 2 Insulator 3 Spacers

10. To access the daughterboards, 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

11. Carefully disconnect connectors J7 and J1 on the bottom daughterboard from connectors J8 and J1, respectively, on the top daughterboard.
    
    

    1 J7 Connector 2 J1 Connector 3 Bottom Daughterboard 4 J8 Connector 5 J1 Connector 6 Top Daughterboard

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
• Isopropyl alcohol
• Cotton swabs

Replace the relay as you would any other through-hole part.

Reassemble the Switch Module

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