Extron electronic RGB 112XI Setting internal jumpers, Controls and Installation, cont’d

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Controls and Installation, cont’d

7Attach the interface to an audio system. See “Connecting audio” on page 2-12.

8Plug the interface into a grounded AC power source.

9Turn on the computer, monitor, and projector (or other display device).

10The image from the computer should appear on the projector and monitor. If it does not, double check steps 3 through 6 and make adjustments as needed.

Setting internal jumpers

The jumpers inside the interface are set at the factory for optimal use by most systems. However, you can change a jumper setting to meet the needs of a particular system.

Changes to internal jumper settings must be performed by authorized service personnel only.

The user-configurable, internal jumpers control the following functions:

J20: Sync polarity jumper — This jumper adjusts the output sync polarity. Horizontal (H) and vertical (V) sync output can either follow

1input sync polarity, or be forced to negative.

•If the jumper is on pins 1 and 2, output H and V sync polarities are forced to negative.

•If the jumper is on pins 2 and 3, output sync polarities follow input sync polarity: The output sync signals’ polarity is the same as the input polarity. This is the default setting.

J40: Vertical sync width jumper — This jumper adjusts the
Wide	vertical sync pulse width. Some digital display
	devices have very specific requirements for
Short
	incoming sync pulse width. If no picture
1

appears, the picture cuts in and out, or the picture is scrambled, try adjusting the vertical sync pulse width or switching from ADSP to DDSP.

•If the jumper is on pins 1 and 2, the output vertical sync pulse will be short (narrow).

•If the jumper is on pins 2 and 3, the output vertical sync pulse will be wide. This is the default setting.

To change the jumper settings, do the following:

1.If the power cord is attached, remove power from the interface by disconnecting the AC power cord from the unit.

2.Remove the interface cover (the top half of the enclosure), as shown in figure 2-3. Remove the screws from the enclosure, slide the cover slightly towards the back of the enclosure, enough to clear the gain/peak switch, lift the cover, and place the cover upside down next to the base of the enclosure.

CAUTION Do not pull on the cable that attaches the cover to the base. Doing so could disconnect the cable from its connectors.

CAUTION Do not touch any switches or electronic components inside the interface. Doing so could damage the interface.

Slide cover back slightly, lift straight up.

Remove (5) screws.

Figure 2-3 — Opening the interface cover

2-6 RGB 109xi and RGB 112xi • Installation RGB 109xi and RGB 112xi • Installation 2-7