Extron electronic ISM 482 - Manual (Page 45)

Operation, cont’d
Integration Scaling Matrix Switcher • Operation 3-20
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 S 3 Sales & Technical Support Hotline if necessary.