Pre-installation testing/troubleshooting

Installation and Operation, cont’d

5 — Vertical sync pulse width — For some digital display devices, if no picture appears, the picture cuts in and out, or it is scrambled, try adjusting the output vertical sync pulse width or switching from ADSP to DDSP.

Off — The vertical sync pulse is wide.

On — The vertical sync pulse is narrow.

6 — Negative sync — This switch controls sync polarity.

Off — Output sync polarity follows (is the same as) input polarity.

On — Both the horizontal and the vertical sync signals are forced to negative polarity on output.

7 & 8 — Composite sync routing — These switches are used to route local monitor signals for Macintosh 13” monitors and all other Macintosh and VGA-type monitors.

7 = On and

8 = Off — Sync routing to 15-pin HD local monitor for all Macintosh (non-13”) and VGA monitors (default setting).

7 = Off and

8 = On — Sync routing to 15-pin HD local monitor for proper sync routing to a Macintosh 13” monitor.

7 = On and 8 = On or

7 = Off and 8 = Off — Invalid combinations. They will not work with either computer type.

2RGB video output connectors — Attach coaxial cables from the interface to the display device via these female BNC connectors. These BNCs are on red, green, blue, black, and yellow pigtail wires secured to the interface by the tie wraps.

For RGBHV output: R is red, G is green, B is blue, H is black, and V is yellow.

For RGBS output: R is red, G is green, B is blue, and S is black.

For RGsB output: R is red, G is green, and B is blue.

3Gain switch — To compensate for cable resistance and capacitance, slide this switch to select the level of video gain that yields the sharpest picture.

Normal (bottom position) — unity gain (no signal boost) Medium (middle position) — mid-level peaking and gain

Maximum (top position) — maximum amount of peaking and gain — Select this for use with longer cables.

If the signal cable between the interface and the output device is shorter than approximately 125 feet, and the gain switch is set to Medium or Maximum, the image may be overcompensated. If the edges of the image seem to exceed their boundaries, or if thin lines and sharp edges look thick and fuzzy, try changing the gain/ peaking setting. The gain switch will be inaccessible after installation, so adjust the gain before installing the interface into a wall or furniture.

4Power connector — Connect a 9VDC to 24VDC power supply

24VDC-9	Power	to this 3.5 mm, 2-pole, direct insertion captive
24VDC-9	+ or –	screw connector. Wire the connector as
	+ or –	screw connector. Wire the connector as
	– or +	shown here. Polarity is not important.
		shown here. Polarity is not important.

5Audio output connector — Insert wires into and tighten the screws on this 3.5 mm, 5-pole, direct insertion captive screw connector for unbalanced or balanced audio output. Wire the connector as shown here.

Unbalanced Output		Balanced Output
See Caution	R	Ring	R
See Caution	-	Ring	-
See Caution	R	Ring	R	Audio
See Caution	Audio -	Ring	-	Audio
Tip	+	Tip	+
Sleeve (s)		Sleeve (s)
Tip	L	Tip	L
Tip	+	Tip	+
	L		L
CAUTION	Connect the sleeve to ground (Gnd). Connecting
	the sleeve to a negative (-) terminal will damage the
	audio output circuits.

6Composite video pass-through RCA connector — A male BNC connector attaches here.

7S-video pass-through 4-pin mini DIN connector — A male 4- pin mini DIN connector attaches here.

8Balanced active audio connector — Insert wires into and tighten the screws on this 3.5 mm, 5-pole, direct insertion captive screw connector for balanced active audio output. Wire the connector as shown above.

9Network pass-through RJ-45 connector — If this connector is not required, a blank cover is supplied to fill this faceplate opening.