Sigtronics SPA-400 Intercom to SCI
Sigtronics SPA-400 Intercom to SCI-S4 Intercom Wiring Changes
Page 1. This is the first of 4 pages illustrating the wiring changes to take an existing SPA-400 installation and rewire it for a SCI-S4 intercom. The illustration below is of the
original SPA-400 installation.
J1 (3) BLUE
AIRCRAFT/INTERCOM INTERFACE AREA
J1 (1) WHITE/BLACK
TO
TIP
TO AIRCRAFT
POWER BUSS
12/28 VDC
A
TIP
RING
BARREL
TIP
P1
ON
VOL
J1
SPA-400 TSO
Intercom
J1 (7) RED
PILOT
PTT SWITCH
J1 (4) BLACK
TO
J1 (3) BLUE
SPA-400
INTERCOM
CO-PILOT
PTT SWITCH
A
TO
A
J1 (6) BROWN
J1 (11) WHITE/ORANGE
J1 (3) BLUE
TIP
AIRCRAFT
HAND MIC
JACK
PILOT
SQ
AIRCRAFT RADIO
RADIO MIC KEY (PTT)
RING
AIRCRAFT
HEADPHONE
JACK
MIC
JACK
12345
MIC AUDIO
(INTERCOM
CENTRAL
GROUND
POINT)
INTERCOM
CIRCUIT
BREAKER
(1 AMP)
BARREL
HEADPHONE
JACK
HEADPHONE AUDIO
POINT A
J1 (5) WHITE
J1 (2) WHITE / RED
TO
TIP
A
J1 (8) TAN
BARREL
BARREL
HEADPHONE
JACK
J1 (10) WHITE / BLUE
TIP
RING
J1 (9) TAN
MIC
JACK
CO-PILOT
J1 (3) BLUE
TO
TIP
A
TIP
RING
BARREL
TO
TIP
BARREL
BARREL
HEADPHONE
JACK
MIC
JACK
PASSENGER 2
Sigtronics Corporation
178 East Arrow Highway
San Dimas, CA 91773
Telephone: (909) 305-9399
E-mail: info@sigtronics.com
Web: www.sigtronics.com
A
TIP
RING
BARREL
HEADPHONE
JACK
MIC
JACK
PASSENGER 1
S igtronics ®
12-12-2014
spa-400_to_sci-s4_wiring_changes.pdf
Sigtronics SPA-400 Intercom to SCI-S4 Intercom Wiring Changes
Page 2. Disconnect the tip terminal of the pilots headphone jack from the blue wire. Make sure that the J1 (3) Blue wire is still connected to the tip of the radio headphone
line. Disconnect and remove the pilot, co-pilot and passenger headphone jacks.
J1 (3) BLUE
AIRCRAFT/INTERCOM INTERFACE AREA
J1 (1) WHITE/BLACK
TO
TIP
TO AIRCRAFT
POWER BUSS
12/28 VDC
A
TIP
RING
BARREL
TIP
P1
ON
VOL
J1
SPA-400 TSO
Intercom
J1 (7) RED
PILOT
PTT SWITCH
J1 (4) BLACK
TO
J1 (3) BLUE
SPA-400
INTERCOM
J1 (6) BROWN
J1 (11) WHITE/ORANGE
J1 (3) BLUE
TIP
AIRCRAFT
HAND MIC
JACK
PILOT
SQ
J1 (5) WHITE
J1 (2) WHITE / RED
TO
TIP
A
J1 (8) TAN
BARREL
BARREL
HEADPHONE
JACK
J1 (10) WHITE / BLUE
TIP
RING
J1 (9) TAN
MIC
JACK
CO-PILOT
J1 (3) BLUE
TO
TIP
A
TIP
RING
BARREL
TO
TIP
HEADPHONE
JACK
BARREL
MIC
JACK
PASSENGER 2
178 East Arrow Highway
San Dimas, CA 91773
Telephone: (909) 305-9399
E-mail: info@sigtronics.com
Web: www.sigtronics.com
S igtronics ®
A
TIP
RING
BARREL
Sigtronics Corporation
AIRCRAFT RADIO
RADIO MIC KEY (PTT)
RING
AIRCRAFT
HEADPHONE
JACK
MIC
JACK
12345
MIC AUDIO
(INTERCOM
CENTRAL
GROUND
POINT)
INTERCOM
CIRCUIT
BREAKER
(1 AMP)
BARREL
HEADPHONE
JACK
HEADPHONE AUDIO
POINT A
BARREL
HEADPHONE
JACK
MIC
JACK
PASSENGER 1
CO-PILOT
PTT SWITCH
A
TO
A
Sigtronics SPA-400 Intercom to SCI-S4 Intercom Wiring Changes
Page 3. Install the supplied stereo headphone jacks and connect to their respective pins on the headphone / intercom interface harness P2. Install the crew and passenger
music input jacks and connect to the interface harness. The customer supplied music sources are connected at these jacks.
The SCI-S4 intercom is connected to the new interface harness P2 and the existing harness J1 of the original SPA-400 installation.
P2 (1) GREEN J1 (1) WHITE/BLACK
P2 (7) WHITE / GREEN
TO
TIP
RING
A
AIRCRAFT/INTERCOM INTERFACE AREA
TO AIRCRAFT
POWER BUSS
12/28 VDC
TIP
RING
BARREL
TIP
AIRCRAFT RADIO
RADIO MIC KEY (PTT)
RING
AIRCRAFT
HEADPHONE
JACK
MIC
JACK
12345
MIC AUDIO
(INTERCOM
CENTRAL
GROUND
POINT)
INTERCOM
CIRCUIT
BREAKER
(1 AMP)
BARREL
HEADPHONE
JACK
HEADPHONE AUDIO
POINT A
TIP
AIRCRAFT
HAND MIC
JACK
PILOT
J2
P1
P2
Passenger
Pilot/CoPilot
J1
ALL
ISO
CREW
S
Q
SCI-S4
Volume
TO
J1 (6) BROWN
J1 (11) WHITE/ORANGE
P2 (8) WHITE / GRAY
J1 (5) WHITE
J1 (2) WHITE / RED
TO
RING
PILOT
PTT SWITCH
J1 (4) BLACK
J1 (3) BLUE
Made in U.S.A.
SCI-S4
INTERCOM
P2 (2) GRAY
J1 (7) RED
TIP
A
J1 (8) TAN
BARREL
BARREL
HEADPHONE
JACK
J1 (10) WHITE / BLUE
TIP
RING
J1 (9) TAN
MIC
JACK
CO-PILOT
P2 (3) YELLOW
P2 (9) WHITE / YELLOW
P2 (4) ORANGE
RING BARREL
P2 (6) VIOLET
P2 (5) BLACK
P2 (10) WHITE/BROWN
TIP
TIP
Sigtronics Corporation
178 East Arrow Highway
San Dimas, CA 91773
RING
TIP
A
TIP
RING
BARREL
TO
RING
TIP
PASSENGER MUSIC
INPUT JACK
Telephone: (909) 305-9399
E-mail: info@sigtronics.com
Web: www.sigtronics.com
HEADPHONE
JACK
BARREL
MIC
JACK
PASSENGER 2
S igtronics ®
A
TIP
RING
BARREL
RING BARREL
P2 (12) WHITE/VIOLET
P2 (11) BLACK
TO
CREW MUSIC
INPUT JACK
BARREL
HEADPHONE
JACK
MIC
JACK
PASSENGER 1
CO-PILOT
PTT SWITCH
A
TO
A
Sigtronics SPA-400 Intercom to SCI-S4 Intercom Wiring Changes
Page 4. This was a brief overview of the SPA-400 to SCI-S4 upgrade wiring installation. Please see the complete SCI-S4 installation and operating instructions before installing
your system.
P2 (1) GREEN J1 (1) WHITE/BLACK
P2 (7) WHITE / GREEN
TO
TIP
RING
A
AIRCRAFT/INTERCOM INTERFACE AREA
TO AIRCRAFT
POWER BUSS
12/28 VDC
TIP
RING
BARREL
TIP
AIRCRAFT RADIO
RADIO MIC KEY (PTT)
RING
AIRCRAFT
HEADPHONE
JACK
MIC
JACK
12345
MIC AUDIO
(INTERCOM
CENTRAL
GROUND
POINT)
INTERCOM
CIRCUIT
BREAKER
(1 AMP)
BARREL
HEADPHONE
JACK
HEADPHONE AUDIO
POINT A
TIP
AIRCRAFT
HAND MIC
JACK
PILOT
J2
P1
P2
Passenger
Pilot/CoPilot
J1
ALL
ISO
CREW
S
Q
SCI-S4
Volume
TO
J1 (6) BROWN
J1 (11) WHITE/ORANGE
P2 (8) WHITE / GRAY
J1 (5) WHITE
J1 (2) WHITE / RED
TO
RING
PILOT
PTT SWITCH
J1 (4) BLACK
J1 (3) BLUE
Made in U.S.A.
SCI-S4
INTERCOM
P2 (2) GRAY
J1 (7) RED
TIP
A
J1 (8) TAN
BARREL
BARREL
HEADPHONE
JACK
J1 (10) WHITE / BLUE
TIP
RING
J1 (9) TAN
MIC
JACK
CO-PILOT
P2 (3) YELLOW
P2 (9) WHITE / YELLOW
P2 (4) ORANGE
RING BARREL
P2 (6) VIOLET
P2 (5) BLACK
P2 (10) WHITE/BROWN
TIP
TIP
Sigtronics Corporation
178 East Arrow Highway
San Dimas, CA 91773
RING
TIP
A
TIP
RING
BARREL
TO
RING
TIP
PASSENGER MUSIC
INPUT JACK
Telephone: (909) 305-9399
E-mail: info@sigtronics.com
Web: www.sigtronics.com
HEADPHONE
JACK
BARREL
MIC
JACK
PASSENGER 2
S igtronics ®
A
TIP
RING
BARREL
RING BARREL
P2 (12) WHITE/VIOLET
P2 (11) BLACK
TO
CREW MUSIC
INPUT JACK
BARREL
HEADPHONE
JACK
MIC
JACK
PASSENGER 1
CO-PILOT
PTT SWITCH
A
TO
A
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