Troubleshooting, cont’d
SGS 408 Switcher • Troubleshooting5-2
Troubleshooting
The image should be displayed properly on the screen.
If the image does not appear
1. Ensure that all devices are plugged in.
2. Make sure that each device is receiving power. If the switcher does not
power on, and the AC power source is functioning correctly, the AC fuse
may be blown. (See “Replacing the AC fuse” on page B-3.)
3. Check the cabling, wiring, and grounding, and make adjustments as
needed. Ensure that the selected output rate and sync format are
appropriate for the output devices. (See page 3-6.)
4. To test the system setup and output, Display a test pattern. (See “Selecting
a test pattern” on page 3-7.)
5. Confirm that the input is providing a signal with a horizontal frequency
between 15 kHz to 100 kHz and a vertical frequency between 50 Hz and
120 Hz.
6. Call Extron’s customer support hotline if needed. Be prepared to discuss the
steps you have taken and the equipment involved.
Symptoms Solutions
If the switcher does not respond to controls
If the image is not displayed correctly
The picture is shifted off the
screen edges.
The image is stable, but it has
ghosting or blooming.
The image is still not
displayed correctly.
Adjust the centering and sizing controls.
Use a different input cable.
Call Extron’s customer support hotline.
Symptoms Solutions
The picture does not move on
screen when the horizontal
and vertical centering
controls are rotated, and the
filtering settings do not
change when the filtering
controls are pressed.
There is no response to
commands from the RS-232
controller.
The switcher may be set for Executive mode.
Adjustments can be made via RS-232 control,
or Executive mode can be turned off by
pressing the two outside menu selection
buttons simultaneously and holding them
for 2 seconds. See page 3-23.
Ensure that the baud rate (9600 baud) and
communication protocol are set correctly. See
page 4-2.
