Extron electronic ISM 482 manual Optimizing the Audio, Troubleshooting, Setting up a DVD source

Setting up a DVD source

To get the best results when using a DVD as a video source, Extron recommends that the DVD player itself be set up to output an aspect ratio of 16:9 and not 4:3. Because all DVDs are mastered as 16:9, having them set up for anything else causes the player to internally scale and compress the signal. The DVD player’s scaling and compression defeats the advantage of having 3-2 pulldown detection in the ISM.

All sizing adjustments to correct the aspect ratio should be done using the ISM. To change the output aspect ratio of most DVD players:

1.Enter the DVD player’s setup or action menu while the disc is stopped.

2.Select the 16:9 aspect ratio.

Optimizing the Audio

Each individual input audio level can be adjusted within a range of -24 dB to +9 dB, so there are no noticeable volume differences between sources and for the best headroom and signal-to-noise ratio. Adjust the audio gain and attenuation as follows:

1.Connect audio sources to all desired inputs and connect the audio outputs to output devices such as audio players (see Input connections on page 6 and Standard output connections on page 8). For best results, wire all of the inputs and the outputs unbalanced.

2.Power on the audio sources, the switcher, and the audio players.

3.Switch among the inputs (see Selecting an input on page 13), listening to the audio with a critical ear or measuring the output audio level with test equipment, such as a VU meter.

4.As necessary, adjust the audio level of each input (see Video & Audio Configuration menu on page 17) so that the output level is approximately the same for all selected inputs.

Troubleshooting

The following tips may help you in troubleshooting.

•Some symptoms may resemble others, so you may want to look through all of the examples before attempting to solve the problem.

•Be prepared to backtrack in case the action taken does not solve the problem.

•It may help to keep notes and sketches in case the troubleshooting process gets lengthy. This will also give you something to discuss if you call for technical support.

•Try simplifying the system by eliminating components that may have introduced the problem or made it more complicated.

•For sync-related problems: Portable digital projectors are designed to operate close to the video source. Sync problems may result from using long cables or from improper termination. A sync adapter, such as the Extron ASTA (active sync termination adapter), may help solve these problems.

•For LCD and DLP projectors and plasma displays: In addition to the sync- related information above, check the user’s manual that came with the projector for troubleshooting tips, as well as for settings and adjustments. Each manufacturer may have its own terms, so look for terms like “auto setup,” “auto sync,” “pixel phase,” and “tracking.”

ISM 482 Integrated Scaling Matrix Switcher • Operation 29