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Use this information to perform the appropriate action for the SRC with which you are working.

DANGER

When working on or around the system, observe the following precautions:

Electrical voltage and current from power, telephone, and communication cables are hazardous. To avoid a shock hazard:

Connect power to this unit only with the IBM provided power cord. Do not use the IBM provided power cord for any other product.
Do not open or service any power supply assembly.
Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm.
The product might be equipped with multiple power cords. To remove all hazardous voltages, disconnect all power cords.
Connect all power cords to a properly wired and grounded electrical outlet. Ensure that the outlet supplies proper voltage and phase rotation according to the system rating plate.
Connect any equipment that will be attached to this product to properly wired outlets.
When possible, use one hand only to connect or disconnect signal cables.
Never turn on any equipment when there is evidence of fire, water, or structural damage.
Disconnect the attached power cords, telecommunications systems, networks, and modems before you open the device covers, unless instructed otherwise in the installation and configuration procedures.
Connect and disconnect cables as described in the following procedures when installing, moving, or opening covers on this product or attached devices.
To Disconnect:
1. Turn off everything (unless instructed otherwise).
2. Remove the power cords from the outlets.
3. Remove the signal cables from the connectors.
4. Remove all cables from the devices
To Connect:
1. Turn off everything (unless instructed otherwise).
2. Attach all cables to the devices.
3. Attach the signal cables to the connectors.
4. Attach the power cords to the outlets.
5. Turn on the devices.
(D005)

Attention:

Before replacing any cables, ensure that the cables are properly routed and securely plugged.
If you are servicing a BPC and get a 1xxx 8720 or 8721 SRC for any BPC, ignore the error until you have the BPC powered on again.
If you are servicing the front BPC and you do not have a redundant HMC, you will not receive errors from your 24–inch expansion units until the service is complete.

Is the SRC 1xxx-8720 or 8721?
- Yes: Continue with the next step.
- No: Go to step 3.
Note: If you are getting a 8720 or 8721 Refcode:
For 575:
- Ensure all HubA (System P1-T5) ethernet cables on the Service Processors are routed to the same BPA on one side of the system and HubB (System P1-T6) cables are routed to the other BPA.
For 590/595:
- Ensure Service Processor J3 ethernet cables are routed to the BPA on one side of the system and J4 cables to the BPA (if present) on the opposite side.
Communications problems will result if cabling is mixed during repair or installation.

In this step you will be measuring voltages on one of the bulk power assemblies (BPAs). If the SRC is 1xxx8720, then you should measure the voltage on BPA-A (front). If the SRC is 1xxx8721, then you should measure the voltage on BPA-B (rear).

Using the labeled test points on the face of the BPA, measure the voltages between the following:
- phase A and phase B
- phase B and phase C
- phase C and phase A
Are all of the meter readings greater than 180 V ac?
- Yes: Go to step 3.
- No: Inform the customer that power voltage at the input to the BPA is either missing or too low and needs to be corrected. This ends the procedure.
Use the following table to perform the appropriate action for the SRC with which you are working.

SRC	Action	Link to locations information
1xxx1D04	Replace the cables between the front light strip and the service processors.	Locations — model 590 and 595 Model 590 and 595 cables
1xxx1D05	Replace the cables between the rear light strip and the service processors.	Locations — model 590 and 595 Model 590 and 595 cables
1xxx8720	Replace the cables between the front BPC and the service processors. (For model 575, that has a BPH between the BPC and the service processor, verify that the cable is connected and functioning.)	Locations — model 575 Model 575 cables or Locations — model 590 and 595 Model 590 and 595 cables. For frame to HMC cables, see External cables.
1xxx8721	Replace the cables between the rear BPC and the service processors. (For model 575, that has a BPH between the BPC and the service processor, verify that the cable is connected and functioning.)
1xxx8731 1xxx8732 1xxx8733 1xxx8734	Replace the cables between both BPCs and the service processors. (For model 575, that has a BPH between the BPC and the service processor, verify that the cable is connected and functioning.)