Exchange the PDU to power supply, 12V cable

Before you begin

Icon for electrostatic discharge wrist strap Use approved ESD procedures to prevent damage.

Attention:

This procedure is not a stand-alone procedure. Customer disruption and damage to the hardware might occur when microcode and power boundaries are not in the proper conditions for this service action.
If a serviceable event FRU repair directed you to this procedure, the microcode and power boundaries are already set.
If a serviceable event FRU repair did not direct you to this procedure, see MAP1230 Replace a FRU without using a serviceable event.

Notes:

All the cables and FRUs to be removed must be uniquely identified so they can be reinstalled correctly.
If an installed earthquake resistance kit prevents you from accessing this FRU, refer to MAP1600.

To locate this FRU, use the location code, which is listed in MAP1245 Finding FRUs by using location codes. There is no identify LED indicator.
A failure of this FRU is not isolated by code, it is only isolated by a visual symptom.
1. You should have been sent here by MAP2730 Visual symptoms for Ethernet switch tray (switches, fans, power junction assemblies) (Model 961) that isolated the problem to the power supply, 12V, note receiving proper voltage.
2. There are two PDU to power supply, 12V cables. The cable is Y cable. It has three connectors. See Figure 1 and Figure 2.
  - E25-J5 (PDU) to E32 and E33 (power supplies)
  - E26-J5 (PDU) to E35 and E36 (power supplies)
Figure 1. Power supply, 12V (Ethernet switch tray fans, Ethernet switches) locations, rear upper right of rack

Figure 2. Base rack locations, front and rear

Figure 3. Locations for power distribution unit (PDU) connectors
Disconnect the cable at all three ends.
Remove the cable retention hardware as needed and then remove the cable.

Route the cable.
Connect both ends of the cable.
Install the cable retention hardware.
Observe the 12V input LEDs indicators (J3, J5) for the PJA (E41, E43) supplied by the 12V power supplies affected by the power cable you replaced. See Figure 4.
Are the LED indicators lit?
- Yes, continue at the next step.
- No, ensure the power cable is properly connected to both 12V power supplies and the PDU. If the problem still occurs, go to MAP2730 Visual symptoms for Ethernet switch tray (switches, fans, power junction assemblies) (Model 961)
Figure 4. 12V power distribution
Exit this service information center parts exchange procedure and return to the procedure that sent you here.