MAP2350 Ethernet switch power problem

All Ethernet switch LEDs are off. Either power input is missing or the Ethernet switch is failing.

MAP2350 Section-1

Procedure

Select the rack model that applies:

Model 941 or 951, go to MAP2350 Section-2 (Models 941, 951).
Model 961, go to MAP2350 Section-3 (Model 961).
Model 983, go to MAP2350 Section-4 (Model 983).
Model 98x (not 983), go to MAP2350 Section-5 (Model 98x, not 983).

MAP2350 Section-2 (Models 941, 951)

Procedure

Locate the Ethernet switch that is failing. Ensure that the Ethernet switch power LED is still off before you go to the next step.

Figure 1. 16-port Ethernet switch power LEDs and input power connectors

Note: In Figure 2, the Model 941 is shown; the Model 951 is similar.

Figure 2. 8-port Ethernet switches
Check whether the power input cable is properly plugged into the failing Ethernet switch. Is it properly plugged?
- Yes, go to the next step.
- No, plug the power input cable. Ensure that the power LED is now lit and exit this MAP.
At the other Ethernet switch, observe the power LED. Is it lit?
- Yes, go to the next step.
- No, both Ethernet switches are not receiving power. Both Ethernet switches, and the management console server, and keyboard and display receive power from a common multi-drop power cable that is connected to both PPSs. Display and repair any related serviceable events for the power system or contact your next level of support.
At the failing Ethernet switch, unplug the power input cable. Then, remove the Ethernet switch assembly from the rack by removing the two screws at each end of the sheet metal brackets. With the Ethernet switch assembly removed, observe the short power cable that goes from the sheet metal bracket to the power connector on the rear of the Ethernet switch. Is it properly plugged?
- Yes, replace the Ethernet switch FRU.
- No, securely plug the short power cable into the power connector on the rear of the Ethernet switch. Reinstall the Ethernet switch. Replug the power input cable, and ensure that the power LED is lit. Then, exit this MAP.

MAP2350 Section-3 (Model 961)

Procedure

Locate the Ethernet switch that is failing. See Figure 3 and Figure 4. Ensure that the Ethernet switch power LED is still off before you go to the next step; note that the Ethernet power LED indicator is the white logo on the top of the switch.

Figure 3. Ethernet switch tray locations (Model 961, rack version 1)

Figure 4. Ethernet switch tray locations (Model 961 rack version 2 rear)
Check whether the power input cable is properly plugged into the failing Ethernet switch. Is it properly plugged?
- Yes, go to the next step.
- No, plug the power input cable. Ensure that the power LED is now lit and exit this MAP.
At the other Ethernet switch, observe the power LED. Is it lit?
- Yes, go to the next step.
- No, both Ethernet switches are not receiving power. Both Ethernet switches, the management console and its cooling fans receive redundant power from two PJA units directly behind the Ethernet switches. Display and repair any related serviceable events for the power system and if there are none, observe the PJA LED indicators, and use MAP2360 PJA visual symptoms to continue the problem isolation.
The Ethernet switch power input cable is a Y-cable with three connectors. See Figure 5.
- The left Ethernet switch (SW1) connects to the switch input , the left PJA (E41) output J6, and the right PJA (E42) output J6.
- The right Ethernet switch (SW2) connects to the switch input , the left PJA (E41) output J4, and the right PJA (E42) output J4.
Is the Y-cable properly connected and not visually damaged?
- Yes. Go to the next step.
- No, connect the Y-cable, ensure that the switch power LED is lit and then exit this MAP.
Figure 5. 12V power distribution
Ensure that the Y-cable is receiving power from at least one PJA before you replace the Ethernet switch.
- The left Ethernet switch (SW1) receives power from the J6 connector on both PJAs.
- The right Ethernet switch (SW2) receives power from the J4 connector on both PJAs.
Observe the J4 or J6 green LED indicators. The indicator is lit when the Y-cable has power present. See Figure 5.
Does the switch receive power from at least one PJA?
- Yes, replace the Ethernet switch. Go to MAP7060 Section-6 (8-port Model 961).
- No, display open serviceable events and repair any power problems that are related to the PJAs. If none is found, begin the repair by using MAP2730 Visual symptoms for Ethernet switch tray (switches, fans, power junction assemblies) (Model 961).

MAP2350 Section-4 (Model 983)

Procedure

At the front of the rack, slide the management enclosure out to the service position and remove the top cover. See Figure 6.

Note: The management enclosure is below the two CEC enclosures.
1. Fully loosen the left and right captive thumb screws.
2. Slide the management out fully so the sliding rails lock into place.
3. At the rear of the top cover, fully loosen the left and right captive thumb screws.
4. Slide the cover back until it lifts off.
Figure 6. Management enclosure, front (Model 983)
Locate the Ethernet switch. See Figure 7.
- SW1, Black network, upper
- SW2, Gray network, lower
Figure 7. Management enclosure locations.
Is the Ethernet switch Power LED indicator off? See Figure 8.
- Yes, go to the next step.
- No, the Ethernet switch has power. Exit this MAP and return to the MAP that sent you here. Remove the Ethernet switch.
Figure 8. Ethernet switch, rear (Model 983)
Check whether the power input cable is properly plugged into the failing Ethernet switch. Is it properly plugged?
- Yes, go to the next step.
- No, plug the power input cable. Ensure that the power LED is now lit and exit this MAP.
The Ethernet switch power input is through a Y-cable with power from both power supplies.

Note: Each Ethernet switch receives separate power through the management enclosure 12V power distribution cable.
1. The two FRUs are the Ethernet switch and the management enclosure 12V power distribution cable. See Figure 9.
2. If you have a volt-meter, unplug the power cable from the Ethernet switch and measure the voltage, it should be +12V.
  - If the voltage is +12V, replace the Ethernet switch. Go to MAP7060 Replacing the Ethernet switch.
  - If the voltage is not +12V, replace the cable. Go to MAP2801 Replacing the management enclosure 12V power distribution cable.
3. If you do not have a volt-meter, replace the FRUs in this order:
  1. Ethernet switch. Go to MAP7060 Replacing the Ethernet switch.
  2. Management enclosure 12V power distribution cable. Go to MAP2801 Replacing the management enclosure 12V power distribution cable.
Figure 9. Management enclosure 12V power distribution cable

MAP2350 Section-5 (Model 98x, not 983)

Procedure

Locate the Ethernet switch that is failing. See Figure 10. Ensure the Ethernet switch port LEDs are all off before you go to the next step.

Figure 10. 8-port Ethernet switch port locations, Model 98x

Note: Upper switch SW1 is "black" network; lower switch SW2 is "gray" network.
Check whether the power input cable is properly plugged into the failing Ethernet switch. Is it properly plugged?
- Yes, go to the next step.
- No, plug the power input cable. Ensure that the power LED is now lit and exit this MAP.
At the other Ethernet switch, observe the port LEDs. Are any lit?
- Yes, go to the next step.
- No, both Ethernet switches are not receiving power (no port LEDs are lit on either switch). Display and repair any related serviceable events for the power system and if there are none, observe the PJA LED indicators, and use MAP2750 visual symptoms for power junction assembly (PJA) devices (Models 98x) to continue the problem isolation.
The Ethernet switch power input cable is a Y-cable with three connectors. See Figure 10 and Figure 11 (models 980, 981 and 982) or Figure 12 (models 984, 985, 986, and 988).
- The upper Ethernet switch (SW1) power cable connects to the upper PJA (E41) output J5, and the lower PJA (E42) output J5.
- The lower Ethernet switch (SW2) power cable connects to the upper PJA (E41) output J7, and the lower PJA (E42) output J7.
Is the Y-cable properly connected and not visibly damaged?
- Yes. Go to the next step.
- No, connect the Y-cable, ensure that the switch power LED is lit and then exit this MAP. If the cable is visibly damaged, go to MAP2750 visual symptoms for power junction assembly (PJA) devices (Models 98x).
Figure 11. Power junction assembly (PJA) locations (models 980, 981, 982)

Figure 12. Power junction assembly (PJA) locations (models 984, 985, 986, 988)
Ensure that the Y-cable is receiving power from at least one PJA before you replace the Ethernet switch.
- The upper Ethernet switch (SW1) receives power from the J5 connector on both PJAs.
- The lower Ethernet switch (SW2) receives power from the J7 connector on both PJAs.
Observe the J5 or J7 green LED indicators. The indicator is lit when output power is present. See Figure 11.
Does the switch receive power from at least one PJA?
- Yes, replace the Ethernet switch. Go to MAP7060 Section-6 (8-port Model 961).
- No, display open serviceable events and repair any power problems that are related to the PJAs. If none is found, begin the repair by using MAP2750 visual symptoms for power junction assembly (PJA) devices (Models 98x).