Extron electronic ISM 482 manual Optimizing the Audio, Troubleshooting, General checks

Operation, cont’d

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” and “Standard
	output connections” in chapter 2, “Installation”. 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”, earlier in this chapter),
	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”, earlier in this chapter) 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 Extron’s 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”.

General checks

1.	Ensure that all devices are plugged in and powered on. The switcher is
	receiving power if the LCD is displaying the default display cycle.
2.	Ensure an active input is selected on the switcher.
3.	Ensure that the proper signal format is supplied.
4.	Check the cabling and make corrections as necessary.
5.	Call the Extron S3 Sales & Technical Support Hotline if necessary.

3-20 Integration Scaling Matrix Switcher • Operation