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2.4.2
Signal Ground
Signal ground is electrically connected to chassis ground via the LCD Panel, video board and mounting
screws. However, there are no DC currents carried through this interconnect.
2.5
External Controls
The display comes from the factory adjusted for the supported modes. When using these modes,
adjustment should not be necessary. However, if it should become necessary, or a non-supported mode
is selected, the following controls are available for adjustment.
There are 4 push buttons located on the back of the display, which allow adjustment of the displayed
image. See figure below for button locations. The provided controls are:
Name
Function
Dot Clk -
Clock Frequency/Phase Decrease
Dot Clk +
Clock Frequency/Phase Increase
Horiz
Horizontal Position
Gain
Video Gain
The Clock Frequency /Phase adjustments are dual function buttons. The phase allows for 32 positions of
phase control. If the button is held down, the clock frequency is adjusted up or down 1 clock each time
the phase control register rolls over. To adjust the clock frequency further, continue to hold the button
down. If phase adjustment is desired, it's best to use single presses.
The Horizontal Position is adjusted by holding down the Horiz button. The position will shift by 1
column for each press. If the button is held down, the position will continuously adjust until released.
The direction of the adjustment depends on the direction of the last adjustment. The direction will
continue to be true until the maximum or minimum adjustment is reached. At this point, the direction
will reverse.
The Gain adjustment is to allow the full scale of the input video to be utilized. The direction of this
adjustment will reverse when a limit is reached. For example, it will adjust from maximum to minimum,
then reverse and go from minimum to maximum. The best way to make this adjustment is with a
continuous gray scale pattern on the display. A proper adjustment will give continuous shading from
black to white.
Figure 2. External Adjustments (Rear View)
Title: Product Specification – LC08 High-Bright Monitor
Document Number: 023-0283-00
Page 7 of 26
Rev C
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