IBM 8485, 8490 Serial port problems, See the User’s Guide on the IBM xSeries Documentation CD

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 Problem Determination and Service Guide 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
The server unexpectedly shuts	See “Solving undetermined problems” in the Problem Determination and Service
down, and the LEDs on the	Guide on the IBM xSeries Documentation CD.
front-panel assembly are not lit.

Serial port problems

For more information about the serial port, see the User’s Guide on the IBM xSeries Documentation CD.

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 Problem Determination and Service Guide 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
The number of serial ports that	1.	Make sure that:
are identified by the operating
		v Each port is assigned a unique address in the Configuration/Setup Utility
system is less than the number			program and none of the serial ports is disabled.
of installed serial ports.
		v The serial-port adapter (if one is present) is seated correctly.
	2.	Reseat the serial-port adapter.
	3.	Replace the serial-port adapter.
A serial device does not work.	1.	Make sure that:
		v The device is compatible with the server.
		v The serial port is enabled and is assigned a unique address.
		v The device is connected to the correct connector. (For connector locations,
			see the User’s Guide on the IBM xSeries Documentation CD.)
	2.	Reseat the following components:
		a.	Failing serial device
		b.	Serial cable
		c. Remote Supervisor Adapter II (if one is present)
	3.	Replace the following components one at a time, in the order shown, restarting
		the server each time:
		a.	Failing serial device
		b.	Serial cable
		c. Remote Supervisor Adapter II (if one is present)
		d. (Trained service technician only) System board

74xSeries 206m Types 8485 and 8490: Installation Guide