IBM Type 7977 manual Failing serial device

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

vSee the Problem Determination and Service Guide on the IBM System x Documentation CD 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 monitor has screen jitter, or	1.	If the monitor self-tests show that the monitor is working correctly, consider the
the screen image is wavy,		location of the monitor. Magnetic fields around other devices (such as
unreadable, rolling, or distorted.
		transformers, appliances, fluorescent lights, and other monitors) can cause
		screen jitter or wavy, unreadable, rolling, or distorted screen images. If this
		happens, turn off the monitor.
		Attention: Moving a color monitor while it is turned on might cause screen
		discoloration.
		Move the device and the monitor at least 305 mm (12 in.) apart, and turn on
		the monitor.
		Notes:
		a. To prevent diskette drive read/write errors, make sure that the distance
			between the monitor and any external diskette drive is at least 76 mm (3
			in.).
		b. Non-IBM monitor cables might cause unpredictable problems.
	2. Reseat the following components:
		a.	Monitor
		b. Remote Supervisor Adapter II SlimLine (if one is present)
	3. Replace the following components one at a time, in the order shown, restarting
		the server each time:
		a.	Monitor
		b. Remote Supervisor Adapter II SlimLine (if one is present)
		c. (Trained service technician only) System board
Wrong characters appear on the	1.	If the wrong language is displayed, update the BIOS code with the correct
screen.		language (see the Problem Determination and Service Guide on the IBM
		System x Documentation CD).
	2. Reseat the following components:
		a.	Failing serial device
		b.	Serial cable
		c. Remote Supervisor Adapter II SlimLine (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 SlimLine (if one is present)
		d. (Trained service technician only) System board

84IBM System x3500 Type 7977: Installation Guide