Model 9116-561 or 570 voltage regulator assembly

You might need to install, remove, or replace the voltage regulator assembly. This section includes procedures so that you can perform these tasks.

The system unit might contain up to three voltage regulator assemblies. The following procedures describe the installation, removal, and replacement of the voltage regulator assemblies.

To complete these procedures, print the following topics and then return here. If the IBM® Systems Hardware Information Center is available on a PC or a notebook that is close to the system on which you are installing or replacing parts, you can use the online version.

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A voltage regulator assembly can be removed with the system power on if, when you start the removal procedure, at least one more voltage regulator assembly is installed than the number of system processor assemblies installed. That is, one system processor assembly requires two voltage regulator assemblies to be installed, and two system processor assemblies require three voltage regulator assemblies to be installed.

A voltage regulator assembly can be added into an empty slot with the system power on or the system power off.

To determine how many voltage regulator assemblies and system processor assemblies are installed, do the following:

If necessary, open the front rack door.
Remove the front cover from the model 9116-561 or 570.

Count the number of system processor assemblies and voltage regulator assemblies installed. For example, Figure 1 shows two system processor assemblies A and three voltage regulator assemblies B.

Figure 1. System processor assemblies and voltage regulator assemblies (front view)

Picture showing example of model system processor assemblies and voltage regulator assemblies (front view)

Table 1 shows the possible valid combinations of system processor assemblies and voltage regulator assemblies for replacing a voltage regulator assembly with the system power on.

Table 1. Determining when a 9116-561 or 570 voltage regulator assembly can be removed with the system power on
System processor assemblies A		Voltage regulator assemblies B			Replace with system power on?
1	2	1	2	3	Replace with system power on?
x		x			No
x		x	x		Yes
x	x	x	x		No
x	x	x	x	x	Yes

Select the appropriate instructions from this list:

Install the model 9116-561 or 570 voltage regulator assembly with power on.
Remove and replace the model 9116-561 or 570 voltage regulator assembly with power on. To remove and replace the voltage regulator assembly with the power on, you need to have at least one more voltage regulator assembly installed than the number of system processor assemblies installed. You also will be removing the control panel. To remove a control panel with the system power on, you must first complete the following tasks:
- Gain access to the Advanced System Management Interface (ASMI). For instructions, see Managing the Advanced System Management Interface (ASMI).
  Note: Only the primary system unit on a model 9116-561 or 570 has a functional control panel. For secondary system units, you can remove the control panel with the power on, and you do not need to access the ASMI.
- Determine if your system has the level of firmware needed to support the procedure. To determine the level of the system firmware, see View existing levels of server firmware. If the first 4 characters of the 9-character firmware release level are SF22, SF23, and SF24, the control panel can be serviced with the system power on. If the first 4 characters of the 9-character firmware release number are SF21, the control panel must be serviced with the system power off.
Install the model 9116-561 or 570 voltage regulator assembly with power off.
Remove and replace the model 9116-561 or 570 voltage regulator assembly with power off. Ensure that you do not have one more voltage regulator assembly installed than the number of system processor assemblies installed.