VSC 75 Installation and Operation
VSC 75 Installation and Operation
Installation and Operation, cont’d
VGA Pin Function Mac Pin
1 Red video 2
2 Green video 5
3 Blue video 9
4 ID bit 4
5 ID bit 8
6 Red ground 1
7 Green ground 6
8 Blue ground 13
9 Not used —
10 Composite & vertical sync gnd 11, 14
11 ID bit 7
12 ID bit 10
13 Horizontal sync 15
14 Vertical sync 12
15 ID bit/composite sync 3
Optimizing the Image
After you have installed the scan converter, follow the
procedures in this section in sequence. This will help you
configure the scan converter for the best settings for your
display environment.
Select the output standard
1. Select the output standard with the PAL Out DIP
switch. This switch affects both display outputs (com-
posite video and S-video), but not the local monitor.
ON — The output is in PAL format.
OFF — The output is in NTSC format.
Size the image to fill the screen
1. Press the Size button on the front panel.
2. Rotate the vertical and horizontal Centering/Pan/Size
rotary controls to adjust the vertical and horizontal
size. Observe the picture on screen as you adjust the
controls. The Min/Max LED will light red when the
minimum or maximum limit of a control is reached.
The size feature affects both display outputs, but local
monitor loop-out is not affected. The size function
remains active for 8 seconds after the rotary controls
become inactive. The rotary controls then default to
the standard centering and pan functions.

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3. Press the Size button again to turn the size feature off.
4. Center the picture by rotating the horizontal and
vertical Centering/Pan/Size rotary controls.
5. Repeat steps 1 through 4 as needed.
Select the filtering level
1. Press the flicker filter button to select the filtering
level that gives the least amount of flickering. The
LEDs next to the flicker button will light to indicate
the selected level of filtering.
If the filter is set before the image size is adjusted,
you must set the filter again after adjusting the
image size.
Troubleshooting
The image should appear properly on the screen(s).
If the image does not appear
1. Ensure that all devices are plugged in.
2. Make sure that each device is receiving power.
3. Check the cabling, wiring and grounding, and make
adjustments as needed. Ensure that the rear panel
output selection toggle switch and PAL Out DIP
switch are set for the formats that match the cable
configuration and the requirements of the display/
recording devices.
4. Verify that the 75 Ohm video input termination DIP
switch has been set correctly.
5. To test the system setup and output, press the Test
button on the front panel, or substitute a video test
generator for the computer input.
6. Confirm that the input is receiving a signal with a
com-patible scan rate (horizontal frequency between
24 kHz and 70 kHz, and a vertical frequency of 50 Hz
to 120 Hz).
7. Call Extron’s customer support hotline if needed. Be
prepared to discuss the steps you have taken and the
equipment involved.

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