Magenta 250A Troubleshooting, Configuration Settings, Video Adjustment, Common Problems

CHAPTER 3: Setup and Installation

3.3 Configuration Settings

The MultiView™ 250A receiver is configurable for various video and audio modes. Note that a compatible transmitter unit must be used at the source end. Reference the appropriate transmitter user guide or call for technical assistance.

A dipswitch on the receiver unit is used to set the video and audio configuration mode. Table 3-1 below shows the configuration settings for SW1 (ON = down, OFF = up)::

NOTE:

There are no user serviceable parts inside the MultiView 250A receiver. All adjustments are

performed externally.

SW1 Configuration Settings

	SW1 position	1	2	3
Signal	Setting
L/R Audio	On	ON	ON
	Off	OFF	OFF
Video	RGBHV			ON
	Composite			OFF
	S-Video			OFF
	Component			OFF
AV Mode	Composite	OFF	OFF	OFF
	+ Stereo Audio*

*AV mode carries all signals on the 15HD Video Output connector. See Appendix A for pinouts

Table 3-1. MultiView 250A Receiver Configuration Settings.

3.4 Video Adjustment

The only adjustments required on the MultiView 250A receiver are the SW1 positions 4 and 5 which must be set to compensate for cable length. Using the table below as a guide, turn SW1 positions ON or OFF for best picture clarity (ON = down, OFF = up):

Cable distance EQ settings

SW1 position	4	5
Short (0-75 ft)	OFF	OFF
Medium (75-150 ft)	ON	OFF
Long (150-250 Ft)	OFF	ON

Table 3-2. Cable Length EQ Settings.

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4.Troubleshooting

4.1Common Problems

In most cases, nearly every issue with the MultiView™ Series can be resolved by checking the CAT5 termination and making sure that it’s pinned to the

568B wiring specification. However, there may be other problems that cause the system to not perform as it’s designed. Below are solutions to the most common installation errors.

Problem:	No video signal at the transmitter local port or at the receiver.
Solution:	• Check that both units are powered.
	• Ensure Cable Length Compensation Switches are set
	correctly (See Section 3-4).
	• Make sure the CAT5 cable is terminated correctly per the
	568B wiring specification.
	• Is the display device powered on and functioning?
Problem:	Poor video quality.
Solution:	• Have all receiver adjustments been finished (see section 3.4).
	• Check all cable connections.
	• Ensure Cable Length Compensation Switches are set
	correctly (See Section 3-4).
	• The video signal’s refresh rate may be set too high for the display.
	Reset to a lower refresh rate in your monitor-configuration menu.
Problem:	Poor audio quality.
Solution:	• Powered speakers are required. Make sure speaker power is
	ON.
	• Check input source levels from the source device. Make sure
	the audio source is not overdriven or underdriven.
Problem:	“Green shift” or “green washout” on multimedia signals.
Solution:	The standard video model is designed to function with DC
	coupled signals in which the black level is referenced to 0 volts.
	Nearly all VGA cards function this way.
	Some media servers and inexpensive VGA DA’s, however, provide
	AC coupled signals and can cause a green color shift in the video.
	This is a result of the sync clamping on the red and blue channels of
	the video/serial model.
	For five-component (RGB/H&V) AC coupled video, the
	MultiView™ Series UTx Universal transmitter
	has been designed with full DC restoration capability. This
	problem is easily solved via a simple switch setting in the UTx
	Transmitter. Please refer to the UTx Transmitter user manual.

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