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©1995-1997 - INLINE, INC.
IN3055 OPERATION MANUAL - REV. 2.1 02/19/00
TROUBLESHOOTING
A display device connected to one of the IN3055 outputs has a bad/scrambled image.
Solution 1: The display device connected to the distribution amplifier may not be compatible with the
computer’s video output. Many LCD panels and data monitors will not display signals at
resolutions higher than 640 x 480 and horizontal scan rates higher than 36 KHz. Make
sure you know what resolution mode the computer video card is set to output. Standard
VGA runs at 31.5 KHz, but SVGA can be as high as 48 - 58 KHz with newer modes such as
1600 x 1200 running at 79 KHz!
Solution 2: The output cable may have a bad sync line. Try another cable.
The output image is missing a color.
Solution:
The output cable may be bad. Check both ends of the cable to see if any of the pins are bent
or missing. Also inspect the cable to see if the coax may have been pinched or severed
internally. Try another cable.
Output image is ghosting.
Solution:
The IN3055 is designed to plug directly into the computer’s graphic card and a short
(6 to 12 ft) monitor cable attached to the loop-through (IN9041) output. An extension cable
for the input or a very long cable on the local monitor may cause this problem. The IN3055
must be located immediately adjacent to the source computer. Do not attempt to lengthen the
input cable.
The output image of the IN3055 is too bright/blooming.
Solution:
There needs to be a termination on the loop-through output. Use a local monitor or an
IN9031 termination plug to provide the necessary 75 ohm termination.
When using the IN3055 with no local monitor, the computer output is black and white
when it should be color.
Solution:
There needs to be a termination on the loop-through so that the computer video card will
configure itself for color VGA mode at boot-up. Use a local monitor or the IN9031
termination plug.
The output image of the IN3055 is visible but has poor quality / low definition.
Solution:
The output cables may be too long or of poor quality. INLINE offers the IN8000 Series
High Resolution Mini-Coax cables in a variety of lengths. This type of cable can be used to
transmit VGA signals 75 to 100 feet or more depending on the signal scan rate.
When using the IN3055 with a laptop computer there is no output image.
Solution 1: An IN9031 termination plug should be used on the female side of the loop-through cable.
Solution 2: Many laptop computers (especially older units) require a keystroke combination in order to
activate the external VGA video port. Check the laptop owner’s manual.
