ATV A-PRO-4 Installation and operation manual

Please use your A-PRO-4 only after reading and understanding the content of
this manual.
In particular, please be sure to read all precautions related to the safe use of this
device.
Please be sure this manual is stored in a place where it is readily available to the
operator for reference.
Functionality and specifications
Names and functions of parts
Connecting external devices
Basic operation
Video and audio operation
Troubleshooting
Support
A-PRO-4 Ver.2.0
AV mixer
Start Up Manual Introduction 1
2
3
4
5
6
7
8
ATV Logo
pantone151
(DIC120)

Precautions
AV mixer A-PRO-4 Start Up Manual
2
Precautions
Please be sure to follow all precautions related to the safe use of this device.
These precautions are intented to ensure that you use this device properly and to protect both you and others
from personal injury as well as your property from damage.
Please read these precautions before using the device and store this manual in a safe place.
Please be sure to review and understand the meaning of the following terms and symbols before reading this
manual.
Warning This symbol is used to indicate precautions which if ignored could
potentially result in death or severe personal injury.
Caution This symbol is used to indicate precautions which, if ignored, could
potentially result in either personal injury or property damage.
Meanings of pictorial symbols
Caution
Caution: Indicates directions that must be followed, and is used
to mark off a paragraph or illustration that provides detailed
instructions.
Prohibited
Prohibited: Indicates an action that is prohibited, and is used
to mark off a paragraph or illustration that provides detailed
instructions.
Mandatory
Mandatory: Indicates an action that must always be performed,
and is used to mark off a paragraph or illustration that provides
detailed instructions.
The use of this device in
shower stalls or bathtubs
is prohibited.
The use of this product inside a shower stall or bathtub could
result in re or electrical shock and cause serious damage. Refer
to the illustration for detailed instructions on prohibited actions.
Touching this device is
prohibited.
Touching this product could result in fire or electrical shock
and cause serious damage. Refer to the illustration for detailed
instructions on prohibited actions.
Disassembly prohibited
Dissaembling this product could result in electrical shock or other
cause of personal injury. Refer to the illustration for detailed
instructions on prohibited actions.
Unplug the adapter and
cable
Indicates that the user should unplug the AC adapter from the
wall socket or the USB cable from the computer. Refer to the
illustration for detailed instructions.

Precautions
AV mixer A-PRO-4 Start Up Manual 3
Warning
■In the event that any of the following were to occur, immediately unplug the
power cord from the wall socket and the USB cable from the computer.
In the event that the device emits smoke, a strange odor, or a strange sound:
Continued use of the device under these conditions could result in fire or electrical
shock. Please contact us to arrange for repairs, once the device no longer emits
smoke, strange odors, or sounds. Never attempt to repair the unit yourself. To do so is
dangerous.
In the event that water or other liquid seeps into the device:
Please contact us immediately. Using the device as it is could result in fire or electrical
shock.
In the event that foreign objects enter the device:
Please contact us immediately. Using the device as it is could result in fire or electrical
shock. (In particular, be careful when this device is used near children.)
In the event that an abnormality, a malfunction, or a failure is found in the device, its AC
adapter, or its electrical power cord:
Please contact us to arrange for repairs. Using the device as it is could result in fire or
electrical shock.
■Do not disassemble or modify the machine.
Doing so might lead to a fire and/or electric shock.
■Always use the AC adapter that came with the device.
Doing so might lead to a fire and/or electric shock.
■Always use an electrical power cord and plug that are suitable for the area or
region where the device is being used.
Doing so might lead to a fire and/or electric shock.
■Do not place heavy objects on top of the plug-in AC adapter, and be sure that
the device does not sit atop the electrical power cord.
Damage to the electrical power cord might lead to a fire and/or electric shock. If a carpet
or rug is spread over the cord, a heavy object might inadvertently be placed on it.
■Do not damage, rework, apply heat, or apply excessive force in bending,
twisting, or pulling the plug-in AC adapter.
Damage to the electrical power cord could result in fire or electrical shock.
■Do not connect many devices to a single power outlet.
Failure to do so might lead to fire.
■Do not use the device in any of the following locations:
Places where the cause of fires, electrical shock, malfunction, discoloration, or
deformation is present.
• Places where the temperature is extremely high due to causes such as being subject
to direct sunlight or being in close proximity to a space heater or other device that
emits heat.
• Baths, sinks, wet floors, and other places with considerable moisture or high humidity.
• Places subject to steam or smoke.
• Places subject to salt corrosion.
• Places exposed to rainfall.
• Places where dust and sand accumulate easily.
• Places subject to constant vibration or movement.
• Tables, benches, or other places that are off-level, wobbly, or otherwise unstable.

Precautions
AV mixer A-PRO-4 Start Up Manual
4
Warning
■Do not place this device anywhere that water or foreign objects can penetrate it
or in a container that contains any kind of fluid.
Doing so might lead to a fire and/or electric shock.
■Do not subject the device to strong impact.
To do so could result in damage or deformation of the device itself, in the device
rupturing, or in the emission of fluid, heat, smoke, or flame.
Caution
■If the unit is not to be used for a long period of time, unplug the plug-in AC
adapter from the wall socket and the USB cable from the computer.
Failure to do so might lead to fire.
■Be sure the electrical power cord is plugged securely into a wall socket.
Failure to do so could result in excessive heat or cause a fire if dust were to accumulate.
■Connect and layout the cables properly.
Tripping on the cables or otherwise causing the device to fall over or fall to the floor could
result in personal injury.
■When unplugging the plug-in AC adapter, do not pull on the electrical power
cord.
To do so could damage the electrical power cord and result in fire or electrical shock.
Always grasp the plug-in AC adapter itself to unplug it.
■Keep the plug-in AC adapter away from hot objects.
The electrical power cord insulation might be melted, possibly resulting in a fire and/or
electric shock.
■Never attempt to unplug the plug-in AC adapter with wet hands.
Doing so might lead to an electric shock.
■Never use a wall socket that does not support the electric power plug securely
even when fully inserted.
To do so could cause heat and result in fire or electrical shock. In such a case, please
request that the retailer or an electrician replace the wall socket.
■Remove all connections before moving the device.
Moving the device while external cables are connected could damage the electrical
power cord and result in fire or electrical shock.
■Do not place your weight or heavy objects on the device.
In particular, be careful when using this device near children. Falling over or breaking
could result in personal injury.
■Take care to avoid burns.
This device emits high heat, so take care to avoid burns.

Precautions
AV mixer A-PRO-4 Start Up Manual 5
Precautions for Use
■Power supply
• Never connect A-PRO-4 to any electrical outlet that is used to power inverter-controlled devices
or devices with an electric motor, such as refrigerators, washing machines, microwave ovens, or
air conditioners. The use of other electrical devices in close proximity to A-PRO-4 could result in
misoperation due to power noise or the generation of other electrical noise. In places where it would
be difficult to provide the A-PRO-4 with an exclusive power outlet, please use an electrical power noise
filter.
• The AC adapter will generate heat when used for long periods of time, but this is normal and does not
indicate a malfunction.
• To prevent misoperation or malfunction, be sure that all power is turned off when connecting A-PRO-4 to
other equipment.
■Installation
• The installation of A-PRO-4 in close proximity to power amplifiers or other equipment with a large
transformer could induce hum. If this happens, increase the separation between the devices or change
their orientation to each other.
• The use of A-PRO-4 in close proximity to televisions or radios could interfere with the reception of audio
or video signals. If this happens, increase the separation between the devices.
• The use of A-PRO-4 in close proximity to mobile phones or other wireless devices could result in noise
or loss of image. If this happens, increase the separation between the devices or turn off the wireless
devices.
• Whenever A-PRO-4 are moved to a location where the ambient temperature differs to an extreme
degree, moisture (condensation) could form inside. Using an A-PRO-4 in this condition could result in
malfunctions. In which case, it is best to wait several hours for the condensation to evaporate before
use.
■Maintenance
• Ordinarily, you should keep an A-PRO-4 clean by wiping it down with a soft, dry cloth or a tightly wrung
damp one. If the A-PRO-4 is heavily soiled, wipe it clean with a cloth dampened in a mild detergent and
then wipe it down with a soft, dry cloth.
• Never use benzene, paint thinner, or alcohol-based solvents to clean A-PRO-4. Doing so could result in
discoloration or deformation.
■Repair
• We cannot warranty the performance of any device or AC adapter that has been disassembled or
modified by the user. Also, we reserve the right to refuse to repair devices or AC adapters.
• When repairing any device, the data stored in memory is sometimes lost. Be sure to back up your data
prior to repair. Please understand that we can neither restore nor provide compensation for lost data.
• We retain an inventory of the functional parts needed to repair A-PRO-4 for a period of six years after
discontinuation of manufacture. Repairs for A-PRO-4 are available only while repair parts are available.
Please feel free to inquire about repairs, however, even after this period is past, since some repairs are
still possible, depending upon the nature of the malfunction.
■Other precautions
• Data stored in an A-PRO-4 memory could be lost due to malfunction or misoperation. Be sure to back
up your data prior to using an A-PRO-4. Please understand that we can neither restore nor provide
compensation for lost data.
• Never apply excessive force to the input and output connectors. To do so could result in malfunctions.
• Always adjust the volume settings so that you do not disturb people who are nearby.
• When transporting an A-PRO-4, wrap it in packing material and place it in its box or otherwise provide
equivalent protection.
• If you do dispose of the box and packing that came with the A-PRO-4, be sure to follow all local
regulations pertaining to the sorting of waste materials.
• Do not use this device to create video images that could adversely affect human health. Image switching
at extremely high speeds could cause headaches, nausea, or seizures in persons already susceptible to
illness. We cannot be held responsible for the effects of video images created with this device.
■Intellectual property rights
• The names of products and companies shown in this manual are the trademarks or registered
trademarks of their respective owners.
• Never use A-PRO-4 for any application that violates the copyrights of a third party. We cannot be held
responsible for instances in which A-PRO-4 are used to violate the copyrights of a third party.

AV mixer A-PRO-4 Start Up Manual
6
■Table of Contents
1Introduction---------------------------------------------- 7
Overview --------------------------------------------------------- 7
Checking the contents of the package ------------------ 7
2Functionality and specifications ----------------- 8
Block Diagram -------------------------------------------------- 8
Program (PGM) output and preview (PVW) output --- 9
Product specifications ---------------------------------------- 9
Connection specifications ----------------------------------10
3Names and functions of parts--------------------13
External View --------------------------------------------------13
Names and functions of top panel parts ----------------14
Names and functions of rear panel parts ---------------15
Onscreen menu names and functions of parts--------16
4Connecting external devices ---------------------17
Connecting to a video input connector ------------------17
Connecting to a video output connector ----------------18
Connecting to an audio/GPI input/output connector ----19
Other connections --------------------------------------------20
5Basic operation----------------------------------------21
Turning the power on and off. ----------------------------21
Change or verify the System Format --------------------22
6Video and audio operation ------------------------23
Switching video------------------------------------------------23
Switching audio -----------------------------------------------28
7Troubleshooting --------------------------------------29
8Support---------------------------------------------------31

7
AV mixer A-PRO-4 Start Up Manual
1
Introduction
A-PRO-4
PSE
for Japan
US
for North America
UK(BSI 3A)
for UK
AU(SAA 2pin)
for Australia
Electrical power cords x 4
Start Up Manual (this document)
AC adapter and EU two-prong electrical power cord
Overview
Checking the contents of the package
• The A-PRO-4 is a video mixer that is capable seamlessly switching four separate video signals.
• It is also capable of switching and mixing audio embedded in video.
• It is equipped with input for two SDI channels and two HDMI channels, and one of the HDMI channels is
capable of being switched to analog video signal input.
• HDMI 1 has built-in scaler functionality and is capable of receiving input at resolutions that di󰀨er from other
input/output.
• It is equipped with input and output connectors for external audio and is capable of mixing audio from an
external source or outputting mixed audio to other devices.
• It is equipped with USB audio video output connectors and can be connected to a PC for live streaming,
teleconferences, or other similar uses.
• It is equipped with a REF IN connector and capable of operation with a GENLOCK system.
The following content is packaged with this product.
Please contact a retail seller should you find that any of the following items are not included with your
purchase.
1
Introduction

8AV mixer A-PRO-4 Start Up Manual
IN 1 SDI
IN 2 SDI
PGM
Mix/
Wipe
IN 3 HDMI
Audio
De-embed
Audio
De-embed
IN 4 HDMI
PVW
Mix/
Wipe
6x3
Matrix
Sw
GPI/AUDIO IN
A/D
+5V
Connect
to CPU
GPI 8
+5V
Connect
to CPU
GPI 7
+5V
Connect
to CPU
GPI 6
+5V
Connect
to CPU
GPI 5
+5V
Connect
to CPU
GPI 4
+5V
Connect
to CPU
GPI 3
+5V
Connect
to CPU
GPI 2
+5V
Connect
to CPU
GPI 1
L
R
Audio
De-embed
Audio
De-embed
IN 4 VIDEO Video
Decoder
4x4
Matrix
Sw
OSD
REF IN Genlock
FS
FS
Audio
Delay
Audio
Embed
Audio
Embed
Audio
Embed
D/A
GPI/AUDIO OUT
PHONES
L
R
SDI OUT
HDMI OUT
USB3.0 OUT
PGM
BUS
PVW
BUS
Ch
Level
MONO/
STEREO
Audio
Follow
MON
SEL
Audio In
Mode
Audio
Out
Mode
Max
Out
Level
Input
Gain
Out
Level
USB
Level
PHONES
Level
Multi
View
AUX1
AUX2
FS
FS
PGM
DSK
PVW
DSK
Alpha
Gen
Scaler
Scaler
2
Functionality and specifications
Block Diagram
2
Functionality and specifications
In the interest of product improvement, the specifications and/or appearance of this unit are
subject to change without prior notice.
Caution

Functionality and specifications
AV mixer A-PRO-4 Start Up Manual 9
IN 1 SDI
IN 2 SDI
PGM
Mix/
Wipe
IN 3 HDMI
Audio
De-embed
Audio
De-embed
IN 4 HDMI
PVW
Mix/
Wipe
6x3
Matrix
Sw
GPI/AUDIO IN
A/D
+5V
Connect
to CPU
GPI 8
+5V
Connect
to CPU
GPI 7
+5V
Connect
to CPU
GPI 6
+5V
Connect
to CPU
GPI 5
+5V
Connect
to CPU
GPI 4
+5V
Connect
to CPU
GPI 3
+5V
Connect
to CPU
GPI 2
+5V
Connect
to CPU
GPI 1
L
R
Audio
De-embed
Audio
De-embed
IN 4 VIDEO Video
Decoder
4x4
Matrix
Sw
OSD
REF IN Genlock
FS
FS
Audio
Delay
Audio
Embed
Audio
Embed
Audio
Embed
D/A
GPI/AUDIO OUT
PHONES
L
R
SDI OUT
HDMI OUT
USB3.0 OUT
PGM
BUS
PVW
BUS
Ch
Level
MONO/
STEREO
Audio
Follow
MON
SEL
Audio In
Mode
Audio
Out
Mode
Max
Out
Level
Input
Gain
Out
Level
USB
Level
PHONES
Level
Multi
View
AUX1
AUX2
FS
FS
PGM
DSK
PVW
DSK
Alpha
Gen
Scaler
Scaler
307
(12-1/8W)
307
(12-1/8)
119119
(4-11/16)(4-11/16)
246
(9-11/16)
2
Functionality and specifications
Program (PGM) output and preview (PVW) output
Program (PGM) output
• The red VIDEO INPUT SELECT button outputs an input signal.
• PGM output default settings are SDI and USB output.
• No onscreen menu is displayed.
Preview (PVW) output
• In Direct mode, the red VIDEO INPUT SELECT button outputs an input signal.
( Refer to P.23 Toggling switching modes)
• In Preview mode, the green Video Input Select button outputs an input signal.
( Refer to P.23 Toggling switching modes)
• MultiView output default setting is HDMI output. (Multiview displays on one screen PGM and PVW outputs)
• Onscreen menu is displayed only MultiVIew output.
Product specifications
Item Description
Dimmensions 307(W) x 246(D) x 119(H) [mm] 12-1/8(W) x 9-11/16(D) x 4-11/16(H) [inch]
Weight 2.9 kg 6 lbs 7 oz (without AC adaptor & Electrical power cord)
Operation Temparature +0 to +40 degrees Celsius +41 to +104 degrees Fahrenheit
Accessories
AC adaptor
Electrical power cords x 5
Startup Manual
2
Functionality and specifications

Functionality and specifications
AV mixer A-PRO-4 Start Up Manual
10
Item Description
SDI IN
Connector BNC type x 2
Signal Standards SMPTE ST2081 SMPTE ST424 (SMPTE ST425-AB) SMPTE ST292 SMPTE
ST259-C
Video Format
2048x1080
60p/59.94p/50p/48p/47.95p/30p/29.97p/25p/24p/23.98p/30PsF/
29.97PsF/25PsF/24PsF/23.98PsF (Conforms to SMPTE ST2048)
1920x1080
60p/59.94p/50p/30p/29.97p/25p/24p/23.98p/60i/59.94i/50i/30PsF/
29.97PsF/25PsF/24PsF/23.98PsF (Conforms to SMPTE ST274)
1280x720 60p/59.94p/50p/30p/29.97p/25p/24p/23.98p (Conforms to SMPTE ST296)
720x480 59.94i (Conforms to ITU-R BT.656-3/5)
720x576 50i (Conforms to ITU-R BT.656-3/5)
Color Format 10 bits YCC4:2:2, 12 bits YCC/RGB4:4:4, 10 bits RGBA/YCCA4:4:4:4,
12 bits YCCA4:2:2:4
Audio Format Linear PCM, 24/20 bits, 48 kHz, 16 ch (Conforms to SMPTE ST299, ST272-C)
HDMI IN
(IN3)
Connector Type A (19 pins) x 1
Signal Standards HDMI1.4
Video Format
2048x1080 60p/59.94p/50p/48p/47.95p/30p/29.97p/25p/24p/23.98p
(SMPTE ST2048 Timings)
1920x1080
60p/59.94p/50p/60i/59.94i/50i/30p/29.97p/25p/24p/23.98p
(Conforms to CEA-861-F)
1280x720 60p/59.94p/50p (Conforms to CEA-861-F)
720x480 59.94p (Conforms to CEA-861-F)
720x576 50p (Conforms to CEA-861-F)
720(1440)x480 59.94i (Conforms to CEA-861-F)
720(1440)x576 50i (Conforms to CEA-861-F)
Color Format 10/12 bits YCC4:2:2, 8/10/12 bits YCC/RGB4:4:4
Audio Format Linear PCM, 16 to 24 bits, 32 to 48 kHz, 2 to 8 ch
HDMI IN
(IN4)
Connector Type A (19 pins) x 1
Signal Standards HDMI1.4
Video Format
2048x1080 60p/59.94p/50p/48p/47.95p/30p/29.97p/25p/24p/23.98p
(SMPTE ST2048 Timings)
1920x1080 60p/59.94p/50p/60i/59.94i/50i/30p/29.97p/25p/24p/23.98p
(Conforms to CEA-861-F)
1280x720 60p/59.94p/50p (Conforms to CEA-861-F)
720x480 59.94p (Conforms to CEA-861-F)
720x576 50p (Conforms to CEA-861-F)
720(1440)x480 59.94i (Conforms to CEA-861-F)
720(1440)x576 50i (Conforms to CEA-861-F)
640x480 60/72/75/85 (Conforms to VESA DMT)
800x600 56/60/72/75/85 (Conforms to VESA DMT)
1024x768 60/70/75/85 (Conforms to VESA DMT)
1152x864 75 (Conforms to VESA DMT)
1280x768 60/75/85 (Conforms to VESA DMT)
1280x800 60/75/85 (Conforms to VESA DMT)
1280x960 60/85 (Conforms to VESA DMT)
1280x1024 60/75/85 (Conforms to VESA DMT)
1360x768 60 (Conforms to VESA DMT)
1400x1050 60/75 (Conforms to VESA DMT)
1440x900 60/75/85 (Conforms to VESA DMT)
1600x1200 60 (Conforms to VESA DMT)
Connection specifications
Input Connectors
2
Functionality and specifications

Functionality and specifications
AV mixer A-PRO-4 Start Up Manual 11
Output Connectors
Item Description
SDI OUT
Connector BNC type x 1
Signal Standards SMPTE ST2081 SMPTE ST424 (SMPTE ST425-AB) SMPTE ST292 SMPTE
ST259-C
Video Format
2048x1080 59.94p/50p/29.97p/25p/24p/23.98p (Conforms to SMPTE
ST2048)
1920x1080 59.94p/50p/29.97p/25p/24p/23.98p/59.94i/50i (Conforms to
SMPTE ST274)
1280x720 59.94p/50p (Conforms to SMPTE ST296)
720x480 59.94i (Conforms to ITU-R BT.656-5)
720x576 50i (Conforms to ITU-R BT.656-5)
Color Format 10 bits YCC4:2:2, 10 bits YCC/RGB4:4:4
Audio Format Linear PCM, 24/20 bits, 48 kHz, 2 ch (Conforms to SMPTE ST299, ST272-C)
HDMI OUT
Connector Type A (19 pins) x 1
Signal Standards HDMI1.4
Video Format
2048x1080 59.94p/50p/29.97p/25p/24p/23.98p (SMPTE ST2048
Timings)
1920x1080 59.94p/50p/29.97p/25p/24p/23.98p/59.94i/50i (Conforms to
CEA-861-F)
1280x720 59.94p/50p (Conforms to CEA-861-F)
720(1440)x480 59.94p/59.94i (Conforms to CEA-861-F)
720(1440)x576 50p/50i (Conforms to CEA-861-F)
Color Format 10 bits YCC4:2:2, 8/10 bits YCC/RGB4:4:4
Audio Format Linear PCM, 24 bits, 48 kHz, 2 ch
2
Functionality and specifications
Item Description
HDMI IN
(IN4)
Video Format 1680x1050 60 (Conforms to VESA DMT)
1920x1200 60 Reduced Blanking (Conforms to VESA DMT)
Color Format 10/12 bits YCC4:2:2, 8/10/12 bits YCC/RGB4:4:4
Audio Format Linear PCM, 16 to 24 bits, 32 to 48 kHz, 2 to 8 ch
VIDEO IN
Connector BNC type x 1
Signal Standards ITU-R BT.470-6
Video Format NTSC, NTSC-J, PAL
REF IN
Connector BNC type x 1
Signal Standards B.B. (SMPTE ST318), Bi-Level (ITU-R BT.1358-1), HD Tri-Level (SMPTE
ST274, ST296)
Signal Format
1920x1080 59.94p/50p/59.94i/50i (Conforms to SMPTE ST274)
1280x720 59.94p/50p (Conforms to SMPTE ST296)
720x480 59.94p (Conforms to ITU-R BT.1358-1)
720x576 50p (Conforms to ITU-R BT.1358-1)
720x480 59.94i (Conforms to SMPTE ST318)
720x576 50i (Conforms to SMPTE ST318)
AUDIO IN
Connector 1/4" TRS phone type (balanced) x 2
Input Level -50 to +4 dBu
Maximum Input
Level +24 dBu
Impedance 150 k / 600 ohms selectable
*0dBu=0.775Vrms

Functionality and specifications
AV mixer A-PRO-4 Start Up Manual
12
Other Connectors
Processing
Item Description
USB2.0 Connector Micro USB Type B (Hi-Speed USB) x 1
Standards USB 2.0 High Speed (HS)
LAN Connector RJ45
Standards 10/100Base-T
DC IN Power Voltage 12 to 20 V
Power Consumption 35 W
Item Description
Video Processing 10 bits YCC4:4:4
Audio Processing 24 bits 48 kHz
2
Functionality and specifications
Item Description
USB3.0
OUT
Connector USB Type B (Super Speed USB) x 1
Standards USB 3.0 Super Speed (SS) / USB 2.0 High Speed (HS)
USB Video Class 1.1, USB Audio Class 1.0
Video Format
(SS)
2048x1080 59.94p/50p/29.97p/25p/24p/23.98p
1920x1080 59.94p/50p/29.97p/25p/24p/23.98p/59.94i/50i
1280x720 59.94p/50p
720x480 59.94p/59.94i
720x576 50p/50i
Video Format
(HS)
720x480 59.94i
720x576 50i
Color Format 8 bits YCC4:2:2
Audio Format Linear PCM, 16 bits, 48 kHz, 2 ch
AUDIO OUT
Connector 1/4" TRS phone type (balanced) x 2
Output Level -20 to +4 dBu
Maximum Output
Level +24 dBu
Minimun Load
Impedance 20k ohms
PHONES
OUT Connector 1/4" TRS phone type (stereo) x 1
*0dBu=0.775Vrms

13
AV mixer A-PRO-4 Start Up Manual
Rear panel
Top panel
Vents
Vents
3
Names and functions of parts
Refer to P.14
Refer to P.15
External View
Do not block the vents.
Caution
3
Names and functions of parts

Names and functions of parts
AV mixer A-PRO-4 Start Up Manual
14
Auto
AUDIO LEVEL fader
Adjust volume for each channel.
VIDEO fader
Switch video.
EXT INPUT indicator
Displays audio level input from AUDIO
IN connector.
Green: -48 dBFS or higher
Red: -6 dBFS or higher
Off: No input
Level meter / format indicator
Displays audio output level.
Press the FORMAT button to light the
current System Format indicator.
FORMAT button
Change or verify the System Format.
TRANSITION knob
Adjust time needed for switching video.
TRANSITION button
Select video switching effect.
CUT: Video switches instantly.
MIX: Current video fades out as next video fades in.
Auto button
Switch videos in TRANSITION settings.
OUTPUT FADE knob
Adjust time needed for video fade out/fade in.
OUTPUT FADE button
Fade in or fade out the video.
BLACK: Fade to black.
WHITE: Fade to white.
MENU
Operate the onscreen menu.
OUTPUT LEVEL knob
Adjust audio output level.
USB LEVEL knob
Adjust USB audio output level.
PHONES knob
Adjust headphone output level.
QR code
Read this QR code into
your smartphone or other
device to access our
product support website.
Input indicator
Displays input status for each channel.
Green: normal input
Off: No input
VIDEO INPUT SELECT button
Switch video input.
AUDIO INPUT SELECT button
Switch audio follow.
FADER indicator
Displays switching direction for video fader.
FADER button
Toggle switching modes.
1234
Names and functions of top panel parts
Refer to P.23 Toggling switching modes
Refer to P.23 Switch video using the dissolve effect.
Refer to P.25 Switch video using the cut effect.
Refer to P.23 Switch video using the dissolve effect.
Refer to P.25 Switch video using the cut effect.
Refer to P.26 Use the VIDEO fader.
Refer to P.26 Use the VIDEO fader.
Refer to P.28 Adjust the audio volume.
Refer to P.28 Adjust the audio volume.
Refer to P.28 Adjust the audio volume.
Refer to P.28 Adjust the audio volume.
Refer to P.23 Switching video
Refer to P.28 Synchronize the audio to the video
and switch. (Audio follow function)
Refer to P.27 Fade in or fade out the output video.
Refer to P.16 Onscreen menu
names and functions of parts
Refer to P.22 Change or verify the
System Format
3
Names and functions of parts

Names and functions of parts
AV mixer A-PRO-4 Start Up Manual 15
SDI IN connector
Input 6G/3G/HD/SD-SDI signals.
HDMI IN connector
Input an HDMI signal.
Cord holder
(Used to hold electrical power cord.)
DC IN connector
Connect the AC adapter.
REMOTE USB connector
Connect to the PC.
REMOTE LAN connector
Connect to the network.
GPI/AUDIO IN connector
Input analog audio signal.
Can be used as GPI connector.
REF IN connector
Input a reference signal for frame
synchronization.
VIDEO IN connector
Input a composite video signal.
HDMI OUT connector
Output an HDMI signal.
(Default setting: MultiView output)
SDI OUT connector
Output 6G/3G/HD/SD-SDI signals.
(Default setting: PGM output)
USB (UVC+UAC) connector
Output USB video and USB audio signals.
(Default setting: PGM output)
GPI/AUDIO OUT connector
Output analog audio signal.
Can be used as GPI connector.
PHONES connector
Connect headphones.
Power switch
Switch electrical power on or off.
Function ground
terminal
Connect to ground.
Auto
AUDIO LEVEL fader
Adjust volume for each channel.
VIDEO fader
Switch video.
EXT INPUT indicator
Displays audio level input from AUDIO
IN connector.
Green: -48 dBFS or higher
Red: -6 dBFS or higher
Off: No input
Level meter / format indicator
Displays audio output level.
Press the FORMAT button to light the
current System Format indicator.
FORMAT button
Change or verify the System Format.
TRANSITION knob
Adjust time needed for switching video.
TRANSITION button
Select video switching effect.
CUT: Video switches instantly.
MIX: Current video fades out as next video fades in.
Auto button
Switch videos in TRANSITION settings.
OUTPUT FADE knob
Adjust time needed for video fade out/fade in.
OUTPUT FADE button
Fade in or fade out the video.
BLACK: Fade to black.
WHITE: Fade to white.
MENU
Operate the onscreen menu.
OUTPUT LEVEL knob
Adjust audio output level.
USB LEVEL knob
Adjust USB audio output level.
PHONES knob
Adjust headphone output level.
QR code
Read this QR code into
your smartphone or other
device to access our
product support website.
Input indicator
Displays input status for each channel.
Green: normal input
Off: No input
VIDEO INPUT SELECT button
Switch video input.
AUDIO INPUT SELECT button
Switch audio follow.
FADER indicator
Displays switching direction for video fader.
FADER button
Toggle switching modes.
1234
Names and functions of rear panel parts
Refer to P.19 Connecting to an audio/GPI
input/output connector
Refer to P.19 Connecting to an audio/
GPI input/output connector
Refer to P.17 Connecting to
a video input connector
Refer to P.17 Connecting to
a video input connector
Refer to P.17 Connecting to a video
input connector
Refer to P.20 Other connections
Refer to P.20 Other connections
Refer to P.20 Other connections
Refer to P.20 Other connections
Refer to P.18 Connecting to a video output connector
Refer to P.18 Connecting to a video output connector
Refer to P.21 Turning the
power on and off.
3
Names and functions of parts

Names and functions of parts
AV mixer A-PRO-4 Start Up Manual
16
Parameter name
Display parameter groups and parameter names.
The selected item is highlighted.
Top Panel
Output video: PVW output
Parameter value
Display the parameter value.
ENTER: Press the Enter button to display menu for
that group.
RESET: Press the Enter button to reset the parameter
values for that group to default.
MENU
Input ENTER
Ext Audio Input ENTER
Output ENTER
Ext Audio Output ENTER
System ENTER
MENU EXIT button
When at the top of the hierarchy: Hide the onscreen menu.
When a parameter name is selected: Move up one level.
When a parameter value is selected: Cancel editing.
Operating the onscreen menu
MENU ENTER button
When the onscreen menu is hidden: Display the onscreen menu.
When a parameter name is selected: Edit the parameter value.
When a parameter group is selected: Move down one level.
When a parameter value is selected: Store the current value.
MENU VALUE button
When a parameter name is selected: Select an item.
When a parameter value is selected: Select the value.
Input
Onscreen menu names and functions of parts
3
Names and functions of parts

17
AV mixer A-PRO-4 Start Up Manual
Rear panel
Professional-use video cameras,
video players, etc.
VIDEO IN connector
Standard definition video camera
and
video player
Composite video signal HDMI SDI
Consumer-use video cameras,
PCs, etc.
SDI IN connector
HDMI IN connector (IN 4)
HDMI IN connector (IN 3)
4
Connecting external devices
Connecting to a video input connector
Parameter name
Display parameter groups and parameter names.
The selected item is highlighted.
Top Panel
Output video: PVW output
Parameter value
Display the parameter value.
ENTER: Press the Enter button to display menu for
that group.
RESET: Press the Enter button to reset the parameter
values for that group to default.
MENU
Input ENTER
Ext Audio Input ENTER
Output ENTER
Ext Audio Output ENTER
System ENTER
MENU EXIT button
When at the top of the hierarchy: Hide the onscreen menu.
When a parameter name is selected: Move up one level.
When a parameter value is selected: Cancel editing.
Operating the onscreen menu
MENU ENTER button
When the onscreen menu is hidden: Display the onscreen menu.
When a parameter name is selected: Edit the parameter value.
When a parameter group is selected: Move down one level.
When a parameter value is selected: Store the current value.
MENU VALUE button
When a parameter name is selected: Select an item.
When a parameter value is selected: Select the value.
Input
Connection Name of connector Description
Connecting
SDI devices SDI IN connector
Connect to a professional-use video camera, video player, or other SDI
device.
Match the input format to the system format of this device.
Refer to P.22 Verify the System Format
Connecting
HDMI devices
HDMI IN
connector
(IN 3)
Connect to a consumer-use video camera, PC, or other HDMI output device.
Match the input format to the system format of this device.
Refer to P.22 Verify the System Format
When connecting a plug-and-play device, the system format is automatically
specified by the device’s EDID information.
HDMI IN
connector
(IN 4)
Connect to a consumer-use video camera, PC, or other HDMI output device.
Irrespective of the system format of this device, input is possible in the
format given the connection specifications.
Refer to P.10 Connection specifications
Connecting
a composite
video device
SDI IN connector
Connect to a standard definition video camera or video player.
When inputting a video signal, do not connect to HDMI connector IN 4. HDMI
connector IN 4 is prioritized.
For video devices with RCA connectors, use commercially available RCA-
BNC conversion.
HDMI connectors on this device are not HDCP compliant.
Caution
4
Connecting external devices

Connecting external devices
AV mixer A-PRO-4 Start Up Manual
18
Rear panel
SDI OUT connector
HDMI
Professional-use video display,
video recorder, etc.
SDI
Consumer-use video display,
TV, etc.
HDMI OUT connector
PC
USB
USB (UVC+UAC) connector
Connecting to a video output connector
Connection Name of connector Description
Connecting
SDI devices
SDI OUT
connector
Connect to a professional-use video display, video recorder, or other SDI
device. Use a device that is compliant with the system format of this device.
Refer to P.22 Verify the System Format
Connecting
HDMI devices
HDMI OUT
connector
Connect to a consumer-use video display, TV, or other HDMI output
connector.
Use a device that is compliant with the system format of this device.
*This device is not Plug-and-Play compliant.
USB
(UVC+UAC)
connector
connection
USB(UVC+UAC)
connector
This device can be connected to a USB 3.0 connector to output audio and
video to a PC. It will be automatically detected as a USB camera and USB
audio device and will operate on standard drivers for both Windows and Mac
OS X operating systems, making it useful for a wide variety of applications.
*We recommend specifying a 1080p or 720p system format when using a
USB (UVC+UAC) connector.
4
Connecting external devices

Connecting external devices
AV mixer A-PRO-4 Start Up Manual 19
Audio device or GPI device
GPI/AUDIO IN connectorGPI/AUDIO OUT connector
Balanced input/output or GPI input/output
Rear panel
Rear panel
SDI OUT connector
HDMI
Professional-use video display,
video recorder, etc.
SDI
Consumer-use video display,
TV, etc.
HDMI OUT connector
PC
USB
USB (UVC+UAC) connector
Connecting to an audio/GPI input/output connector
Connection Name of connector Description
Connecting
audio devices
GPI/AUDIO OUT
connetor
GPI/AUDIO IN
connetor
This device features TRS-balanced I/O connectors.
Use a cable suitable for the device to be connected.
Default signal levels are +4dBu, which can be adjusted to match the
device to be connected.
See the reference manual for details on how to adjust this device.
Connecting GPI
devices
GPI/AUDIO OUT
connetor
GPI/AUDIO IN
connetor
GPI/AUDIO connectors can be used as GPI terminals based on internal
parameter settings. Also, GPI can be toggled between input and output.
See the reference manual for details on how to use this device.
In order to protect speakers and other devices from damage when connecting audio devices, turn
down the volume for all devices and turn o󰀨 the electrical power before connecting.
Caution
4
Connecting external devices

Connecting external devices
AV mixer A-PRO-4 Start Up Manual
20
REMOTE USB connector
REMOTE LAN connector
PC
USB LAN
Networks
REF IN connector
Device to be connected
Synchronization signals
Rear panel
Other connections
Connection Name of connector Description
Connecting
to REF IN
connectors
REF IN connector
This device is capable of operation with a GENLOCK system when a
synchronization signal is input. Input is possible for synchronization signals
described in the connection specifications. Input a reference signal with a
frame rate identical to that of the system format of this device.
Refer to P.10 Connection specifications
Refer to P.22 Verify the System Format
Connecting to
REMOTE LAN
connectors
REMOTE LAN
connector
Connecting to a network will enable the user to control a wide range of this
device’s functionality from a browser.
See the reference manual for details on how to use this device.
Connecting to
REMOTE USB
connectors
REMOTE USB
connector
Connecting the remote USB connector of this device to the USB 2.0 port of a
PC will enable the user to change parameter values and update software.
See the reference manual for details on how to use this device.
4
Connecting external devices