Kramer Electronics 401DXL user manual Troubleshooting, Power and Indicators, Video Signal

11TROUBLESHOOTING

NOTES

Please note that if the output signal is disturbed or interrupted by very strong external electromagnetic interference, it should return and stabilize when such interference ends. If not, turn the power switch off and on again to reset the machine.

If the following recommended actions do not result in satisfactory operation, please consult your KRAMER Dealer.

11.1Power and Indicators

Problem		Remedy
No Power	1.	Confirm that power connections are secured at the machine and at the
		receptacle. Make sure the receptacle is active, outputting the proper voltage.
	2.	If there is still no power use a Philips screwdriver to remove screws on both
		sides of the machine and release the panel.
	3.	Locate fuse inside your machine. Confirm that the fuse is good by looking
		for the wire connected between the ends of the fuse. If this wire is broken,
		replace fuse with another, with the same rating.
	4.	Install cover and tighten the Philips screws.

11.2 Video Signal

Problem		Remedy
No video at the output	5. Confirm that your source and output devices are turned on and connected
device	properly. The input of your machine should be of an identical signal format to
	the output of your source. Signals at the output of your machine should be of
	an identical signal format as at the input of your display.
	6. Confirm that any other device in the signal path have the proper input and/or
	output selected.
	7. Use the Video Tester to test the video path leading to/from your machine (see
	section 4.1"Video Tester")
Video level is too high or	8. Verify that the lines are well matched through 75ohm impedances.
too dim.	9. Confirm that the connecting cables are of high quality and properly inserted.
	10. Check level controls located on your source input device or output display.
Noise bars are "rolling"	Hum bars (ground loop) are caused by a difference in the ground potential of any
	two or more devices connected to your signal path. This difference is
up or down in the output
	compensated by passing that voltage difference through any available
image
	interconnection, including your video cables.
or:
		WARNING!
Low Frequency Hum in
	Do not disconnect the ground from any piece of
the output signal
	video equipment in your signal path!
	Check the following to remove hum bars:
	1. Confirm that all interconnected equipment is connected to the same phase
	of power, if possible.
	2. Remove equipment connected to that phase that may introduce noise, such
	as motors, generators, etc.
	3. Disconnect all interconnect cables and reconnect them one at a time until
	ground loop reappears. Disconnect the affected cable and replace, or insert
	an isolation transformer in the signal path.

Kramer Electronics Ltd.

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