Serial Port Problems - Lenovo ThinkServer RD120 Hardware Maintenance Manual

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, ThinkServer RD120 Machine Types 6444, 6445, 6446, and 6447," on page 25
to determine which components are customer replaceable units (CRU) and which components are field
replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
The OVER SPEC LED on the
Easy LED Diagnostics panel is
lit, and the power channel D
LED on the system board is lit.
The server does not turn off.
The server unexpectedly shuts
down, and the LEDs on the
operator information panel are
not lit.

Serial port problems

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, ThinkServer RD120 Machine Types 6444, 6445, 6446, and 6447," on page 25
to determine which components are customer replaceable units (CRU) and which components are field
replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
The number of serial ports that
are identified by the operating
system is less than the number
of installed serial ports.
158
ThinkServer RD120 server Machine Types 6444, 6445, 6446, and 6447: Hardware Maintenance Manual
Action
1. Remove all PCI adapters (the low-profile PCI Express adapters in PCI slots 3
and 4, and the adapters on the PCI riser card in PCI slots 1 and 2).
2. Restart the server. If the OVER SPEC and power channel LEDs are still lit, see
the actions for +12 v critical overvoltage fault in "System event/error log
messages" on page 184.
3. Reinstall the adapters, one at a time, restarting the server each time. If the
power channel D LED is lit, the adapter that you just reinstalled is defective.
Replace the defective adapter.
1. Turn off the server by pressing the power-control button for 5 seconds.
2. Restart the server.
3. If the server fails POST and the power-control button does not work, disconnect
the power cord for 20 seconds; then, reconnect the power cord and restart the
server.
Attention: In a dc power environment, only trained service personnel other
than Lenovo service technicians are authorized to connect or disconnect power
to the dc power supply. See the documentation that comes with each dc power
supply.
4. If the problem remains, suspect the system board.
See "Solving undetermined problems" on page 194.
Action
1. Make sure that:
v Each port is assigned a unique address in the Configuration/Setup Utility
program and none of the serial ports is disabled.
v The serial-port adapter (if one is present) is seated correctly.
2. Reseat the serial port adapter, if one is present.
3. Replace the serial port adapter, if one is present.