IBM 704 manual Monitor Problems Action

Troubleshooting

Monitor Problems	Action
Wavy, unreadable,	If the monitor self-tests show that the monitor is OK,
rolling, distorted screen,	consider the location of the monitor. Magnetic fields
or screen jitter.	around other devices (such as 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. (Moving
	a color monitor while it is turned on might cause
	screen discoloration.) Then move the device and the
	monitor at least 305 mm (12 in.) apart. Turn on the
	monitor.
	Notes:
	1. The distance between monitors and diskette
	drives should be at least 76 mm (3 in.) to
	prevent diskette drive read/write errors.
	2. Non-IBM monitor cables might cause
	unpredictable problems.
	3. An enhanced monitor cable with additional
	shielding is available for the 9521 and 9527
	monitors. See your IBM reseller or IBM
	marketing representative for information
	about the enhanced monitor cable.
	If the problem recurs, have the monitor and system
	serviced.
The monitor works when	Verify that the primary monitor cable is connected to
you turn on the system,	the video port.
but goes blank when you	Be sure you installed the necessary drivers for the
start some application
	application.
programs.
Blank screen	Verify that:
	1. The voltage-selection switch is set to the correct
	setting.
	2. The system power cord is plugged into the system
	and a working electrical outlet.
	3. The monitor is turned on and the Brightness and
	Contrast controls are adjusted correctly.
	4. The monitor signal cable is connected to the correct
	connector on the system.
	If the items above are correct and the screen remains
	blank, have the system serviced.
Only the cursor appears.	Have the system serviced.
Wrong characters appear	Have the system serviced.
on the screen.

Chapter 5. Solving Problems 247