190-00917-01
GMA 240 Installation Manual
Rev. D
Page 2-3
2.3.2 VOLUME/MUTE Configuration Adjustments
The following adjustments can be made through access holes in the top cover of the GMA 240:
•
Alert 1 Volume
•
Alert 2 Volume
•
Alert 3 Volume
•
Rear connector TEL input volume
•
Front panel jack TEL input volume
•
MASQ (Master Avionics SQuelch) mute level
Refer to
for the location of the access holes.
CAUTION
Exercise care when inserting adjustment tools through the top cover. Damage to
the unit may occur if an adjustment tool is accidentally forced against unintended
components or circuit board paths. Use a 2 mm (max blade width) flat-blade non-
conductive screw driver or adjustment tool.
CW adjustment increases the levels for volume inputs and for the mute threshold for radio inputs.
R0314
Only
Primary
COM
mutes
MUSIC
Empty
If a jumper is supplied in this position, the RADIO button
will mute music only when the Primary COM (the COM
selected for transmission) is receiving audio. Default
RADIO mutes music operation occurs when any selected
COM / NAV / AUX radio is receiving audio.
R0313
Enable
KEYED
ICS
Empty
If a jumper is supplied in this position, the intercom system
(ICS) will only allow intercom MIC audio to be heard when
the corresponding ICS KEY for the MIC position is
pressed. When this configuration is used, the VOX knobs
should be set fully CCW (live MIC). See
for
information on wiring intercom keys.
R0312
Reserved
Empty
Reserved
R0309
Reserved
Empty
Reserved
R0302
Reserved
Empty
Reserved
R0301
Reserved
Empty
Reserved
R0300
Reserved
Empty
Reserved
Table 2-1 Configuration Jumpers
Component
Name
Default
Description
