Troubleshooting – Extron Electronics IN2112R User Manual

Page 18

Troubleshooting

The display device connected to the IN2112R output has a bad / scrambled image.

Solution 1: Verify that the correct input cable is being used (see list on page 5).
Solution 2: The display device connected to the output of the interface may not be compatible with the

computer output. Standard 640 x 480 VGA runs at 31.5 KHz, and SVGA can be as high as 48
- 58 KHz, depending on the vertical refresh rate. PC, MAC, SUN and other high-resolution
workstations have new and ultra high-resolution modes such as 1600 x 1200 and
1800 x 1440, and can output a video signal with a horizontal scan rate of over 100 KHz! Many
data monitors and data projectors are not compatible with these resolutions and frequencies.

Solution 3: Check the dipswitch settings to make sure the unit is putting out a sync format that the display

device can use. For most applications, the default dipswitch settings (see page 11) will work
best. For LCD / DMD / ILA / D-ILA / Plasma Display devices, you may have to disable the
horizontal position control.

Solution 4: The RGBS or RGBHV cable may have a bad sync line. Try running the sync through another

cable.

Solution 5: The IN2112R output sync range may not be compatible with the display device. Check the

resolution and refresh rate for both the computer graphics card and the data display device to
ensure compatibility.

The output image is very dark.

Solution: The horizontal position control may be set off to an extreme setting or may be interacting

poorly with the horizontal position control on the display device. Follow the horizontal
position adjustment procedure on page 9.

The local monitor looks fine but the image on the LCD projector is wavy or has vertical bars in the
picture.

Solution 1: LCD / DMD / ILA / D-ILA / Plasma Display devices work best when the sync signal has

minimum sync processing. Set the interface dipswitches as indicated in the section OPTIMAL
SETTINGS FOR LCD / DMD / ILA / D-ILA / PLASMA DISPLAY DEVICES on page 8.
Setting the interface to RGBHV output and disabling the horizontal position control may
alleviate this problem.

Solution 2: LCD / DMD displays often have an adjustment called Phase Adjust or Fine Phase Control.

This control should be adjusted to provide the best image.

The output image is missing a color.

Solution: Possibly the RGBS or RGBHV cable is bad. Try switching connections on the output to verify

that the bad color’s cable is OK (Example: If there is no red, try running the green output
through the red cable and see if the green is displayed or not).

The output image is too green.

Solution: The dipswitch settings may be set for sync on green output and the display device doesn’t like

that format. Try changing the dipswitches to output an RGBS or RGBHV signal (see
Dipswitch Settings on page 11).

The horizontal position control is not working.

Solution 1: Check the dipswitch settings to see if the horizontal position control has been disabled.
Solution 2: The input setting may be RGsB (sync on green). The horizontal position control does not work

with RGsB input signals.