Garmin SL40 - Electrical Connections; Power; Speaker and Headphone Outputs; Microphone Inputs

Installation
head
screws
so
the
unit will
slide
in
and out
freely.
Attach
the
front
of the mounting
frame
to
the instrument panel.
Use
support
brackets
to attach
the
rear of
the frame
to
the aircraft.
To install
the unit
in thc
mounting
frame,
make surc
the
canr lock
is
rotatc6
so the
rear
part
is
up, then
slide the
unit into
thc
frame
and
tighten
with
the
3132 hex
tool. The
unit
will
be
pulled
into
the franre
by the
canr
lock
and tlie
connectclrs
will
fully engage.
To
remove
thc
unit from
the
ntounting
frame,
use
the
hex tool
and
turn the
tool
CCW.
The
ullit will be pushed
out
of the
fianre
by the
cam lock
assembly.
No special
cxtraction
tools
are
rcquired.
EIpcTnICAL
CoxuEcTIoNS
The
SL40
installation
kit includcs
a
l5
pin
dsub
shell and
crinrp
contacts.
Thc crimp
contacts
are
specified
lbr
20
t<t 24
AWG
wire.
Make
thc
crirnp
connections
with
a crimp
tool
as
specitied
in
the
Special
Tools
Required
section
on
page
4. All
wires
should
lre
20
to 24
AWG
unless otherwise
spccificd.
A
wiring
diagram
is includcd
as Figure
5.
Pownn
The
SI-40
is internally
fuscd
at 7
amps.
A
scparatc
5 arnp
(maximum)
circuit
brcaker
or
fuse
should
be installed
for
downlirre
ovcrload
or
short
circuit protection.
Make
t6c
powcr
conncctions
to the
SL40
using
20
awg
wire.
Note:
Circuils.tlrould
lta
ytntlaclael
in
ucc:orelunce v,ith
guidalincs
in1lC
43.t-i-lA,
chaptt:r
II.
section 2,
parugruph
429.
SpeaxnR
AND
HEADpuoNE
Out'pu.r's
Clonnect
thc
spcaker
ancl
headphones
to the
output pins
cln
thc rcar
copncctor.
MTcRopHONE
lNpurs
Microphone
input
contlcctions
shor-rld
be
nradc
using
a
twistecl
pair
shicldccl
cable.
Attach
the
signal
ground
to
the nlic ground
pin
on thc rcar
conncctor
and
connect
thc
shield
to the
rear
cclnnector
plate.
Tn,qNsN.{rr
KEy
lxpur
Thc
TxKcy
input
on
the rcar
connector
must
be
pulled
low
to grould
to
cnablc
the
transmittcr.
This
input
sltould
be
conncctcd
to a nricrophouc
or yokc
rnountccl
momentary
push
button
switch.
IxrrRcoM
SEI-ECToR
SwtrcH
The
SL40
includes
an intercom
function
that
can
be enabled
by an
external
control
switch.
This
is an
optional
connection.
When
making
connection
fbr the
intercom
selection,
connect
the
intercom
selection
input
to a
remote
moutttecl
normally
open
switclt.
A niomentary
toggle
or
alternate
action
switch
can
be
used.
Conltect
the
other
terminal
of
the switch
to
ground.
The
intercom
function
is enabled
when
the input
is pulled
low
to
ground.
SL40 I nstallation
Manual