Garmin GMA 240 Component, Name, Default, Description, 2.3.1Internal Configuration Jumpers

2.3.1Internal Configuration Jumpers

The following internal configuration adjustments may be made by removing or replacing jumpers on the PCB. The jumper positions are designed to accept a 0 Ω resistor of 0603 size. Refer to Appendix C for component location.

This service should only be performed by a qualified technician. Garmin is not responsible for damage caused during adjustment of these internal configuration jumper settings. Refer to the GMA 240 Maintenance Manual for disassembly/reassembly instructions.

The GMA 240 contains static sensitive components. Observe proper anti-static procedures when performing any solder procedures on the unit.

Component	Name	Default	Description
R0303	Alert Mutes	Populated	If this jumper is removed, music will not be
	Music		interrupted by alert audio. Default operation
			is recommended.
R0304	COM1 Internal	Empty	If a jumper is supplied in these positions,
	Sidetone		internal sidetone will be heard during PTT to
			simulate received sidetone from a radio that
R0305	COM2 Internal	Empty
			does not provide one during transmission.
	Sidetone
			This should only be used if a radio does not
			perform this function already.
R0308	TEL Internal	Populated	If this jumper is removed, intercom audio
	Sidetone		and intercom sidetone will not be heard
			when the TEL button is selected. Many
			phones supply sidetone when a call is in
			session. This causes a noticeable change in
			intercom sound quality but it is usually not
			disruptive. Default operation is
			recommended unless the effect of sidetone
			from the telephone is disruptive to intercom
			operation.
R0315	TEL jack detect	Empty	If a jumper is supplied in this position, when
	bypass		TEL is selected the audio panel will assume
			a telephone is in use in the front jack
			regardless of phone detection. This should
			be used only if the audio panel is not
			capable of properly detecting the telephone
			that will be used in the installation.

Page 2-2	GMA 240 Installation Manual
Rev. A	190-00917-01