TECHNISONIC INDUSTRIES LIMITED
www.til.ca
A790 Operating Instructions
TiL 09RE409 Rev D
3-1
SECTION 3 – CONFIGURATION MODE
3.1 INTRODUCTION
The A790 can be put into a mode that allows four features of the unit to be configured,
these are:
1.
Configuring the unit for the backlight bus voltage used in the airframe.
2.
Enabling or disabling a Power On Test of the PA system.
3.
Setting the sidetone level to the operator's headset.
4.
Download Siren and Trill sound files.
NOTE:
These options are typically configured once — items 1-3 at install time, item 4 at the
factory.
To
enter
the configuration mode: with the unit OFF press and hold the SIREN, TRILL and
PLAY keys, turn on the A790, now release the keys.
To
exit
configuration mode: either press the 'REC' button, or turn the power off.
3.2 CONFIGURATION MODE OPERATION
When in configuration mode, the front panel buttons are re-mapped to the various functions
as described in the following sections.
3.2.1 SIREN – Select the Backlight Voltage
The MIC rotary switch has 3 positions:
Pressing the SIREN button will toggle the configuration of the A790 backlight system to
work with either 28 VDC or 5 VAC systems.
The button is lit to indicate 28V configuration, and unlit to indicate 5V configuration.
Factory default is: 28V.
3.2.2 TRILL – Select the Amplifier Test
Pressing the TRILL button toggles the amplifier test tone feature between enabled or
disabled. When enabled the unit will produce a three second test tone each time the unit is
powered up. As of this writing only the Powersonix Inc. PA systems are known to support
this feature. Ensure that you know if this feature is supported before enabling it.
The button is lit when the test tone is enabled. Factory default is: disabled.
3.2.3 PLAY – Set the Side-tone Level
Pressing the PLAY button toggles between set or store the side-tone level. When the button
is lit the unit is in side-tone set mode, the side-tone level can be set using the volume knob.
When the button is pressed again (to unlit), the setting will be stored into memory.
Summary of Contents for A790
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