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GMA 240 Installation Manual Page 2-3
190-00917-01 Rev. A
Component Name Default Description
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 section 4.5.2 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
2.3.2 VOLUME/MUTE Configuration Adjustments
The following adjustments can be made through access holes in the top cover of the GMA 240:
1. Alert 1 Volume
2. Alert 2 Volume
3. Alert 3 Volume
4. Rear connector TEL input volume
5. Front panel jack TEL input volume
6. MASQ (Master Avionics SQuelch) mute level
Refer to Figure 2-1 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.