IBM 7870B4U Service Manual page 189

v See Chapter 4, "Parts listing," on page 41 to determine which components are CRUs and which components
are FRUs.
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Message
System under recommended voltage for +0.9
V.
System under recommended voltage for +3.3
V.
System under recommended +5 V fault.
Action
Informational only.
Note: If the problem remains, complete the following steps:
1. Reseat the blade server - See "Removing the blade server from the
BladeCenter unit" on page 52 and "Installing the blade server in a
BladeCenter unit" on page 53.
2. Check the function of the shared BladeCenter unit resources. See
"Solving shared BladeCenter resource problems" on page 227.
3. (Trained service technician only) Replace the system-board
assembly - See "Removing the system-board assembly" on page
97 and "Installing the system-board assembly" on page 98.
Informational only.
Note: If the problem remains, complete the following steps:
1. Reseat the blade server - See "Removing the blade server from the
BladeCenter unit" on page 52 and "Installing the blade server in a
BladeCenter unit" on page 53.
2. Check the function of the shared BladeCenter unit resources. See
"Solving shared BladeCenter resource problems" on page 227.
3. (Trained service technician only) Replace the system-board
assembly - See "Removing the system-board assembly" on page
97 and "Installing the system-board assembly" on page 98.
Informational only.
Note: If the problem remains, complete the following steps:
1. Reseat the blade server - See "Removing the blade server from the
BladeCenter unit" on page 52 and "Installing the blade server in a
BladeCenter unit" on page 53.
2. Check the function of the shared BladeCenter unit resources. See
"Solving shared BladeCenter resource problems" on page 227.
3. (Trained service technician only) Replace the system-board
assembly - See "Removing the system-board assembly" on page
97 and "Installing the system-board assembly" on page 98.
175
Chapter 6. Diagnostics