IBM 1400 (2611) manual Modem-Related Symptoms

Modem-Related Symptoms

Symptom/Error		FRU/Action	in	Sequence
Internal	modem does	Ÿ Go	to	“Modem Board Check”
not work	correctly	on	page 117.

ŸModem connector

ŸModem board

ŸSystem board

Intermittent Problems

Intermittent system hang problems can be caused b variety of reasons that have nothing to do with a defect, such as cosmic radiation, electronic disc software errors. FRU replacement should only be c ered when a recurring problem exists.

When analyzing the intermittent problem, do the foll

1.	Run	the	diagnostic test for	the system board
	10 times.
2.	If	no	error is detected,	do not replace an

3.If any error is detected, replace the FRU test to verify that there are no more errors

Undetermined Problems

The diagnostic tests did not identify which adapt device failed, which installed devices are incorre a short circuit is suspected, or whether the sy erative. Follow the procedures below to isolate th FRU.

Verify that the power supply being used at the failure is operating correctly.

1.Power off the computer.

2.Check the cables, wires, and connectors for s cuits and open circuits. Visually check them f

damage. If any problems are found, replace t

3. Remove or disconnect all of the following devic

ŸNon-IBM devices

ŸPrinter, external mouse & keyboard, and oth external devices

ŸBattery pack

ŸHard disk drive

Ÿ Diskette drive/CD-ROM/DVD-ROM drive

Ÿ PC Card (PCMCIA)

4.Power on the computer.

5. Determine if the problem has changed.

6.If the problem does not occur again, reconnec removed devices one at a time until you find failing FRU.

ThinkPad i Series 1400 (Part131 II)