Replacing a TX Matrix Plus Seven-Input 430-A Power Supply Input Power Tray

1. Removing an Input Power Tray
2. Disconnecting the DC Power Cables from an Input Power Tray
3. Connecting the DC Power Cables to the Replacement Input Power Tray
4. Installing an Input Power Tray

Removing an Input Power Tray

1. Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cables might become active during installation.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
3. Switch the circuit breakers on the power supply faceplate to the OFF position (O).
4. Loosen the captive screws that secure the input power tray to the power supply.
5. Grasp the metal handle of the input power tray and pull it down toward you. The circuit breakers are switched off as you pull the handle down.
6. Remove the input power tray from the power supply.

Figure 1: Removing an Input Power Tray

Disconnecting the DC Power Cables from an Input Power Tray

1. Use a Phillips screwdriver to loosen the screws on the metal input power tray cover. Remove the metal input power tray cover.
2. Remove the cable restraint. Use a Phillips screwdriver.
3. Remove the positive (+) DC source power cable lugs to the RTN (return) terminals on the upper row. Use a 7/16-in. (11 mm) nut driver to remove first the nuts, then the washers (see Figure 2).

   Figure 2: Disconnecting the Positive (+) DC source Power Cable Lugs to an Input Power Tray in a TX Matrix Plus Router

   
4. Remove the power lug separator over the terminal studs on the lower row of the input power tray.
5. Remove the nuts and washers from the power terminal studs on the lower row.
6. Remove the negative (–) DC source power cable lugs to the –48V (input) terminals on the lower row of the input power tray. Use a 7/16-in. (11 mm) nut driver to remove first the nuts, then the washers(see Figure 3).

Figure 3: Disconnecting the Negative (–) DC Source Power Cable Lugs to an Input Power Tray

Connecting the DC Power Cables to the Replacement Input Power Tray

1. Remove the nuts and washers from the power terminal studs on the lower row.
2. Attach the negative (–) DC source power cable lugs to the –48V (input) terminals on the lower row of the input power tray. Use a 7/16-in. (11 mm) nut driver to remove first the nuts, then the washers (see Figure 4).

   Figure 4: Connecting the Negative (–) DC Source Power Cable Lugs to an Input Power Tray

   
3. Reinstall the power lug separator over the terminal studs on the lower row of the input power tray.
4. Remove the nuts and washers from the power terminal studs on the upper row.
5. Remove the positive (+) DC source power cable lugs to the RTN (return) terminals on the upper row. Use a 7/16-in. (11 mm) nut driver to remove first the nuts, then the washers(see Figure 5).

   Figure 5: Connecting the Positive (+) DC source Power Cable Lugs to an Input Power Tray in a TX Matrix Plus Router

   
6. Attach the cable restraint. Use a Phillips screwdriver.
7. Reinstall the metal input power tray cover. Use a Phillips screwdriver to tighten the screws on the metal input power tray cover.

Installing an Input Power Tray

1. Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cables might become active during installation.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
3. Switch the circuit breakers on the power supply faceplate to the OFF position (O).
4. Slide the input power tray into the power supply.
5. Grasp the metal handle of the input power tray and push it up toward the power supply.
6. Tighten the captive screws that secure the input power tray to the power supply.

Figure 6: Installing an Input Power Tray