Lenovo 6437, 6438, 6436 Intermittent problems, USB keyboard, mouse, or pointing-deviceproblems

Intermittent problems

vFollow the suggested actions in the order in which they are listed in the Action column until the problem is solved.

vSee the parts listing in the Hardware Maintenance Manual to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU).

vIf an action step is preceded by “(Trained service technician only),” that step must be performed only by a trained service technician.

Symptom	Action
A problem occurs only	1. Make sure that:
occasionally and is difficult to
	v All cables and cords are connected securely to the rear of the server and
diagnose.	attached devices.
	v When the server is turned on, air is flowing from the fan grille. If there is no
	airflow, the fan is not working. This can cause the server to overheat and
	shut down.
	2. Check the system-error logs (see “Using the Configuration/Setup Utility
	program” on page 35).

USB keyboard, mouse, or pointing-device problems

vFollow the suggested actions in the order in which they are listed in the Action column until the problem is solved.

vSee the parts listing in the Hardware Maintenance Manual to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU).

vIf an action step is preceded by “(Trained service technician only),” that step must be performed only by a trained service technician.

Symptom	Action
All or some keys on the	1.	See http://www.lenovo.com/accessories for keyboard compatibility.
keyboard do not work.
	2.	Make sure that:
		v The keyboard cable is securely connected.
		v The server and the monitor are turned on.
	3.	Move the keyboard cable to a different USB connector.
	4.	Replace the following components one at a time, in the order shown, restarting
		the server each time:
		a. Keyboard
		b. (Only if the problem occurred with a front USB connector) Internal cables to
		the operation information panel
		c. (Only if the problem occurred with a front USB connector) Operator
		information panel
		d. (Trained service technician only) System board

Chapter 5. Solving problems 47