Extron electronic MVX 88 Series - Manual (Page 39)

3-21 MVX 44 / 48 / 84 / 88 VGA Matrix Switchers • Operation
PRELIMINAR
Y
a . If one or more output LEDs are lit AND the +dB LED is lit, press and
release the < button repeatedly until the highest-numbered lit output
LED goes out. Count the button presses. In example 8, assume a value
of +8 dB. It will take three presses of the < button for the Output 1 LED
to go out.
If one or more output LEDs are lit AND the –dB LED is lit , press and
release the > button repeatedly until the highest-numbered lit output
LED goes out. Count the button presses.
If the +dB LED is lit and NO output LEDs are lit , press and release the
< button repeatedly until the +dB and –dB LED are both lit, indicating
0 dB. Count the button presses.
If the –dB LED is lit and NO output LEDs are lit , press and release the
> button repeatedly until the +dB and –dB LED are both lit, indicating
0 dB. Count the button presses.
b . Return to the original audio gain setting by pressing and releasing the <
or > button (the opposite of the button you pressed in step a) the same
number of steps you pressed the opposite arrow button in step 1. In
example 8 , this means pressing the > button three times.
c . Add the dB value indicated by the highest-numbered lit output LED (no
output LEDs lit and both dB LEDs lit = 0 dB) and either of the following:
• The number of button presses from 0 dB, or
• The number of button presses from when the highest-numbered
output LED lit. In example 8:
Output 1 LED: 6 dB
+ 2 presses: +2 dB
8 dB
d . The lit +dB or –dB LED indicates the gain (+) or attenuation (–).
3 . Press and release the < button once to decrease the audio level (figure 3-33).
The < LED flashes each time the button is pressed
Press and release the < button several more times to continue to decrease
the audio level (figure 3-33). Note the output LED, +dB LED, and –dB LED
changes that occur each time the < button is pressed and released.
Figure 3-33 shows the result of pressing the < button a total of 9 times to
change the value to -1 dB. Note that the +dB LED has turned off and that the
–dB LED is on to indicate a negative level.
VU
3 3 0
+ 6 10
2 1 4 3
OUTPUTS
+dB
-dB
The -dB LED
indicates a negative
(attenuation) level.
In this example, the LEDs indicate audio attenuation in the –1 dB to –5 dB range.
The Output 1, Output 2, and Output 3
LEDs display the input's audio level range.
Press the button to
decrease the input audio level
by 1 dB per button push.
The power LED blinks
frequently to indicate that
the adjusted level is
properly set.
A VU meter connected
to output 1 indicates
that the adjusted level
is approximately the
same as the –10 dBV
internal level.
= lit, = unlit, = flickering LED
Figure 3-33 — Adjust the input audio level
N Output mutes are protected when front panel Lock mode 2 is selected. You can view the mutes in Lock
mode 2 but you cannot change them from the front panel. See “Setting the front panel Locks ( Executive
modes)” on page 3-40.
If front panel Lock mode 2 is selected and you try to perform steps 4 and 5, the actions are ignored.