Chapter 3 - Operation; Figure 7 - Front Panel Controls - ADEMCO AMC21 Installation And Operating Instructions Manual

To turn on the monitor, press the power button on the front panel. After a
few seconds, video should appear on the monitor. If video does not appear,
refer to the Troubleshooting section of this manual.
Pressing the Under Scan button switches between "Over Scan" and "Under
Scan." When the monitor is set to "Under Scan," the LED is lit and the
entire picture, with some black border, is displayed on the monitor. In "Over
Scan," the picture fills the screen.
Pressing the Video Input button switches between two video sources. The A
and B LEDs light indicating which video source is displayed on the monitor.
Pressing Menu brings up the OSD (on-screen display) menu. The Up and
Down cursors are used to move between items in the menu. The Left and
Right cursors are used to make adjustments to individual menu items.
The OSD menu options are:
Volume:
Contrast:
Brightness: Adjusts the image brightness
Sharpness: Adjusts the image sharpness
Color:
Chapter 3 – Operation
Figure 7 – Front panel controls
Adjusts the audio volume
Adjusts the image contrast
Adjusts the image color intensity
21-Inch Color Monitor
AMC21 7