CHAPTER 4: Troubleshooting
Problem: “
Green shift” or “green washout” on multimedia signals.
Solution:
Please contact Technical Support.
The standard video/serial 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, 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
AC1060A single port transmitter has optional DC restoration
circuitry that is easily enabled via a dipswitch setting (see
Appendix C.
4.2 Calling Black Box
If you determine that your CAT5 Multi VGA System is malfunctioning, do not
attempt to alter or repair it. It contains no user-serviceable parts. Contact Black
Box at 724-746-5500.
Before you do, make a record of the history of the problem. We will be able to
provide more efficient and accurate assistance if you have a complete description,
including:
• the nature and duration of the problem.
• when the problem occurs.
• the components involved in the problem.
• any particular application that, when used, appears to create the problem or
make it worse.
4.3 Shipping and Packaging
If you need to transport or ship your CAT5 Multi VGA System:
• Package it carefully. We recommend that you use the original container.
• If you are shipping the CAT5 Multi VGA System for repair, make sure you
include everything that came in the original package. Before you ship, contact
Black Box to get a Return Authorization (RA) number.
11
CAT5 MULTI VIDEO SYSTEM.
Appendix A. Cabling Pinouts
Table A-1. HD15 video connector.
Table A-2. AUDIO connector
Pin
RGBHV
(VGA)
RGBS
RGsB
YUV
1
Red +
Red +
Red +
2
Green+
Green+
Green+
3
Blue+
Blue+
Blue+
4
—
—
—
5
Gnd
Gnd
Gnd
6
Red-
Red-
Red-
7
Green-
Green-
Green-
8
Blue-
Blue-
Blue-
9
—
—
—
10
Gnd
Gnd
—
11
Gnd
Gnd
—
12
—
—
—
13
H Sync
C Sync
—
14
V Sync
—
—
15
Gnd
Gnd
—
PIN
Audio
Pin 1
Left Channel
Pin 2
Ground
Pin 3
Right Channel
Pin 4
-
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