Comprehensive Video CVG-606xl, CVG-808xl user manual Audio Signal, Control

Problem	Remedy
Noise bars are "rolling" up		Hum bars (ground loop) are caused by a difference in the ground potential
or down in the output		of any two or more devices connected to your signal path. This difference
image		is compensated by passing that voltage difference through any available
or:		interconnection, including your video cables.
Low Frequency Hum in		WARNING!
the audio output		Do not disconnect the ground from any piece of
		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 the
		ground loop reappears. Disconnect the affected cable and replace, or insert an
		isolation transformer in the signal path.

12.3 Audio Signal

Problem	Remedy
No audio at the output	1.	Confirm that your sources and output device are powered on and connected
device, regardless of input		properly. Audio signals connected to the input of your machine should be
selected		properly wired to the output of your source. Audio signals connected to the
		output of your machine should be properly wired to the input of your machine
		or recorder.
	2.	Confirm that any other amplifiers in the signal path have the proper input
		and/or output selected. Pay special attention to input amplifiers that may be
		built into your acceptor.
Audio level is too low	1.	Confirm that the connecting cables are of high quality and properly built. Take
		special care in noting the wiring configuration of balanced to unbalanced
		cables.
	2.	Check level controls located on your source input device or output display or
		recorder.

12.4 Control

Problem	Remedy
No control of Matrix	1.	Confirm the wiring of the connecting cable. This pin configuration may be found in
Switcher from PC		Figure 4. Cable length should not exceed 25 feet.
software	2.	Confirm that all DIP switches on the Matrix Switcher have been set properly. Keep
		in mind that if you are only controlling one Matrix Switcher on a specific port, that
		Matrix Switcher must be assigned the ID of “1”.
	3.	Confirm that the baud rate of your computer COM port is set to the same as that of
		your Matrix Switcher (9600-Baud). Confirm that the proper COM port is selected in
		the control software.
	4.	Confirm that bi-directional communication is enabled on all Matrix Switchers.
		Please refer to Section 9‎.3.2 "Setting the Configuration Switches" for proper
		configuration for your Matrix Switcher.
	5.	With custom software, do not send multiple commands at the same time. The Matrix
		Switcher must complete one command and send the reply, before receiving another.
	6.	Confirm that the computer you are using supports true RS-232C protocol.
		Computers such as the Apple Macintosh do not!
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