Antec Three Hundred Two User manual

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Three
Hundred Two
User
Manual

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Three Hundred Two User Manual
Congratulations on your purchase of the Three Hundred Two!
The team that brought you the Three Hundred is back with an enclosure designed to handle tomorrow’s
high-performance systems. Introducing the Three Hundred Two, the next standard in affordable gaming
cases. Our newest chassis is built specifically for gamers, from its attractive, yet functional front bezel, to
its advanced cooling system. With tool-less 5.25” & 3.5” drive bays, a large cable management
compartment and two front panel USB 3.0 ports with an internal connector, the Three Hundred Two is
the new heir to the Gaming Series legacy.
The Three Hundred Two does not include a power supply. Make sure you choose a power supply that is
compatible with your computer components and has a long enough power harness to reach your
motherboard and peripheral devices. We recommend our High Current Gamer or Earthwatts power
supplies for the latest ATX specification compliance, broad compatibility, and power savings capability.
At Antec, we continually refine and improve our products to ensure the highest quality. As such, your
new chassis may differ slightly from the description in this manual due to improvements applied for the
optimal building experience. As of the date of publication, all features, descriptions, and illustrations in
this manual are correct.
Disclaimer
This manual is intended only as a guide for Antec’s computer
enclosures. For more comprehensive instructions on installing the
motherboard and peripherals, please refer to the manuals that
come with those components.

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Table of Contents
Section 1: Introduction
1.1 Getting to Know Your Chassis............................................................................5
1.2 Chassis Specifications.........................................................................................6
1.3 Included Screws .................................................................................................6
Section 2: Hardware Installation
2.1 Setting Up ..........................................................................................................8
2.2 Removing the Side Panels and Front Bezel…………………………………………………….8
2.3 Motherboard Installation...................................................................................9
2.4 Installing KUHLER H2O Liquid Coolers................................................................10
2.5 Power Supply Installation ..................................................................................10
2.6 External 5.25” Device Installation......................................................................11
2.7 Internal 2.5” Device Installation ........................................................................12
2.8 Internal 3.5” Device Installation ........................................................................13
2.9 Cable Management............................................................................................13
2.10 Expansion Slot Device Installation .....................................................................14
Section 3: Front I/O Ports
3.1 USB 3.0...............................................................................................................16
3.2 AC’97 / HD Audio Ports......................................................................................16
3.3 Power Switch / Reset Switch / Hard Disk Drive LED Connectors.......................17
3.4 Rewiring Motherboard Header Connections.....................................................18
Section 4: Cooling System
4.1 Included Fans .....................................................................................................20
4.2 Optional Fans .....................................................................................................21
4.3 Air Filters............................................................................................................22

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Section 1
Introduction
Three Hundred Two User Manual

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1.1 Getting to Know Your Chassis
1. 3 x 5.25” drive bays
2. 2 x 2.5” drive bays
3. 6 x 3.5” drive bays
4. 1 x 120 mm rear TwoCool fan (standard)
5. 1 x 140 mm top TwoCool fan (standard)
6. 2 x 120 mm front intake fans (optional)
7. 1 x 120 mm side intake fan (optional)
8. 1 x 120 mm side exhaust fan behind motherboard (optional)
9. 8 expansion slots
10. CPU cutout
11. Motherboard mount: Standard ATX, microATX or Mini-ITX
12. Power supply mount
13. Front ports: 2 x USB 3.0, Audio In/Out

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1.2 Chassis Specifications
Chassis Type
Mid Tower
Chassis Color
Black
Dimensions
513 mm (H) x 229 mm (W) x 471 mm (D)
20.2” (H) x 9” (W) x 18.5” (D)
Weight
15.3 lbs / 6.9 kg
Cooling
- 1 x 140 mm top TwoCool fan (standard)
- 1 x 120 mm rear TwoCool fan (standard)
- 2 x 120 mm front intake fans (optional)
- 1 x 120 mm exhaust fan behind motherboard tray (optional)
- 1 x 120 mm side panel fan to cool graphics cards (optional)
Drive Bays
- 3 x 5.25” tool-less drive bays
- 6 x 3.5” tool-less drive bays
- 2 x 2.5” drive-bays
Expansion Slots
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Motherboard Size
Standard ATX, microATX, Mini-ITX
Front I/O Panel
- 2 x USB 3.0 with internal motherboard connector
- Audio In/Out
- Power and Reset buttons located on top panel of chassis
1.3 Included Screws
An inventory of all screws and intended
usage and quantity is provided here:
A. PSU/Motherboard screws (16)
B. Motherboard standoffs
(9:4 preinstalled)
C. 5.25”/2.5” optional drive screw (8)
D. Long fan screws (8)
E. Drive bay rails for 3.5”
(6 pairs)
F. Zip ties (4)
A
B
C
D
E
F

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Section 2
Hardware Installation
Three Hundred Two User Manual

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2.1 Setting Up
When working in your case, please keep the following in mind:
Put the case upright on a flat, stable surface so that the rear panel (power supply and expansion
slots) is facing you.
Handle all components and cards with care.
To avoid electrostatic discharge, ground yourself periodically by touching an unpainted metal
surface or by using a wrist grounding strap.
Before you connect a cable, ensure that both connectors are correctly aligned and oriented.
Do not sit on your chassis. Although it is constructed of heavy-duty steel and internally
reinforced, it is not designed to support the weight of an adult, and may buckle.
Do not use your fingernails to separate edges or lift the sides of the chassis, as paint chipping or
injury may occur.
Place the panel thumbscrews aside in a safe place.
2.2 Removing the Side Panels and Front Bezel
To remove the left and right side panels:
1. Remove each of the two thumbscrews first.
2. Remove the panel by gripping the tab at the rear of the panel
and pull it backward slightly, then swing the panel outward.
3. Exercise caution and control when handling chassis interiors.
We strongly recommend taking the appropriate time and care
when working inside the chassis. Avoid hurried or careless
motions.
You need to remove the front bezel in order to access the air filters and
conduct maintenance.
To remove the front bezel:
1. Remove the left side panel as described above.
2. Locate and depress the three tabs on the inside of the front
panel.
3. Swing the panel outward until it comes away completely.

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2.3 Motherboard Installation
Before proceeding, check the manual for your CPU cooler to find out if there are steps you must do
before installing the motherboard.
Make sure you have the correct I/O panel for your motherboard. If the panel provided with the chassis
isn’t suitable, please contact your motherboard manufacturer for the correct I/O panel.
This case comes with 4 preinstalled motherboard standoffs. These are positioned for Standard ATX
motherboards but can be relocated to accommodate other form factors.
1. Align the motherboard with the standoff holes on the motherboard tray and remember or mark
which holes are lined up.
2. Install standoffs as needed (B in Section 1.3) and put the motherboard in.
3. Screw your motherboard into the standoffs with the provided motherboard mounting screws.
Note: If you plan on using the 2.5” drive mount on the rear of the motherboard tray, the drive must be
installed before the motherboard. See Section 2.7 for instructions on how to install your 2.5” drives.
Make sure you have the correct I/O panel.

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2.4 Installing KUHLER H2O Liquid Coolers
The following instructs how to install the Antec KUHLER H2O liquid CPU cooler (620 / 920). For any other
CPU coolers, please consult your manufacturer’s installation guide.
Caution:
Check your motherboard’s CPU socket to ensure its compatibility with the KUHLER H2O. The KUHLER
H2O 620 / 920 is compatible with the following CPU sockets:
Intel® LGA 1155 / 1156 / 1366 / 2011*
AMD® AM2 / AM3 / AM2+ / AM3+
*Your unit may not contain the LGA 2011 mounting bracket. To receive this bracket, please contact
Antec customer support (information is listed at end of manual).
**Be sure to install the KUHLER H2O with the end of the tubes positioned at the bottom of the radiator.
1. Remove the rear fan by unscrewing the fan from the back of the chassis.
2. Preparing the KUHLER H2O backplate is specific to your CPU socket. Please refer to the KUHLER
H2O installation guide, available at
http://www.antec.com/Believe_it/product.php?id=Mjc2OCYxNw== (KUHLER H2O 620) or
http://www.antec.com/Believe_it/product.php?id=NzA0MzcwJjE3 (KUHLER H2O 920) for more
information.
3. Prepare the retention ring according to the CPU socket you’re using.
4. Complete installation according to the KUHLER H2O instructions.
2.5 Power Supply Installation
1. With the case upright, place the power supply in the case and align the rear of the unit with the
mounting holes.
2. Attach the power supply to the case with the screws provided (A in Section 1.3).
Attach the power supply with the provided screws.

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Press down on the drive cover tabs.
2.6 External 5.25” Device Installation
The Three Hundred Two can support up to three 5.25” devices.
1. Remove the side panels and front bezel as directed in Section 2.2.
2. Remove the drive bay cover by pressing in on the four small tabs on either side of the cover,
then push cover out the front of the bezel.
3. Replace the front bezel on the front of the chassis.
4. Slide your 5.25” drive through the front of the chassis until it lines up flush with the front bezel.
You will feel the drive lock into position.
5. If you need more clearance on the inside of the chassis for your drive, pull the drive bay tab on
the inside of the chassis toward you and push the drive in further.
Remove the drive bay cover.
Slide you drive until it locks.
Pull on the tab to adjust drive bay clearance.

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2.7 Internal 2.5” Device Installation
There are two 2.5” drive mounting locations in the Three Hundred Two: on the back of the motherboard
tray and at the bottom of the case.
To install on the back of the motherboard tray:
1. Remove the side panels as described in Section 2.2.
2. Secure your drive with the 2.5” screws provided (C in Section
1.3). Your drive will attach on the back of the motherboard
tray, with screws affixing from the front of the tray.
Note: The motherboard should not be installed when installing your 2.5” device in this location.
To install at the base of the case:
1. Remove the left side panel as described in Section 2.2.
2. Secure your drive to the base of your case with the 2.5” screws provided (C in Section 1.3).
Align your drive’s holes with the drive bay holes.
Secure your drive with the provided 2.5”screws.

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2.8 Internal 3.5” Device Installation
The Three Hundred Two includes 6 pairs of 3.5” drive rails. You will need 1 pair per 3.5” drive.
1. Line up the drive rail pins to the sides of your 3.5”
drive. Ensure that the squeeze-tabs are aligned on the
side of your drive that does not have power or data
connectors.
2. Snap the rail into place.
3. Repeat steps 1-2 for the other side of the 3.5” drive.
4. Pinch the ends of the drive rails together and slide the
drive into the 3.5” bay until it locks into position.
2.9 Cable Management
There is a cable management compartment between the
motherboard and right side panel. You can tuck excess
cables in this compartment or route them to the drive
bays through one of the four conveniently-placed cable
management holes.
Choose the cables you would like to pass through the
holes behind the motherboard tray. Pull them through
the hole toward the right side of the case. Feed the cables
back through the insertion point nearest the destination
of the cable.
This is the drive rail pin
that is inserted into
your 3.5” drive hole
Pinch the ends of the drive rails and then slide your drive into the 3.5”
bay until it locks into position.

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2.10 Expansion Slot Device Installation
When installing graphics cards or other expansion cards, you must
first remove the rear place covering the expansion slots.
1. With the rear of the case facing you, remove the 2 screws
shown to remove the plate.
2. Install your expansion cards according to the manufacturer’s
instructions.
3. Repalce the plate and screws.
Remove these screws prior to expansion card installation

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Section 3
Front I/O Ports

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Pin
Signal Names
(HDA)
Pin
Signal Names
(AC’97)
1
MIC2 L
1
MIC In
2
AGND
2
GND
3
MIC2 R
3
MIC Power
4
AVCC
4
N C
5
FRO-R
5
Line Out (R)
6
MIC2_JD
6
Line Out (R)
7
F_IO_SEN
7
N C
8
Key (no pin)
8
Key (no pin)
9
FRO-L
9
Line Out (L)
10
LINE2_JD
10
Line Out (L)
Three Hundred Two User Manual
3.1 USB 3.0
The Three Hundred Two comes with two front panel USB 3.0 ports and includes an internal
motherboard connector. To access USB 3.0 capability from the front panel:
1. Identify the USB 3.0 header on your motherboard.
2. Connect the USB 3.0 header to the motherboard port. Be
sure to align the connector in the proper orientation so
that you do not damage the pins on your motherboard.
3.2 AC’97 / HD Audio Ports
There is an Intel® standard 10-pin AC’97 connector and an Intel® 10-pin HDA (High Definition Audio)
connector linked to the front panel of the chassis.
You can connect either the AC’97 or the HDA connector, depending on your motherboard. Locate the
internal audio connectors from your motherboard or sound card and connect the corresponding audio
cable. Consult your motherboard or sound card manual for the pin-out positions. Even if your system
supports both standards, only use one connector.
Align the connector properly to
prevent damage to your
motherboard.

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3.3 Power Switch / Reset Switch / Hard Disk Drive LED Connectors
Connected to your front panel are LED leads for power and HDD activity, as well as switch leads for the
power and reset buttons. Attach these to the corresponding connectors on your motherboard. Consult
your motherboard manual for specific pin header locations. For LEDs, colored wires are positive ( + ).
White or black wires are negative ( –). If the LED does not light up when the system is powered on, try
reversing the connection. For more information on connecting LEDs to your motherboard, see your
motherboard user’s manual.
Note: Polarity (positive and negative) does not matter for switches.
Front panel leads

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3.4 Rewiring Motherboard Header Connections
There may come a time when you need to reconfigure the pin-out of a motherboard header connector.
Examples could be for your USB header, audio input header, or some other front panel connector such
as the Power Button connector.
Before performing any work, please refer to your motherboard user’s manual or your motherboard
manufacturer's website to confirm the pin-out needed for your connector. We strongly recommend
making a notated drawing before beginning work so that you can recover if your work gets disturbed.
Determine which wires you need to remove in order to rewire your plug to match the USB pin-outs on
your motherboard (refer to your motherboard user’s manual). Working on one connector at a time, use
a very small flathead screwdriver or similar tool to lift up on the black tab located beside the gold posts
(squares). This will allow you to easily slide out the pins from the USB plug.
Working carefully so as not to damage the wires, connectors, or pins, slowly remove the pin from the
connector. Repeat these steps for each wire you need to change.
Working carefully so as not to damage the wires, connectors or pins, slowly insert the pin into the
correct slot of the connector then snap closed the black tab that was lifted in step 1. Repeat these steps
for each wire you need to change.
Front panel headers

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Section 4
Cooling System
Three Hundred Two User Manual

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4.1 Included Fans
The Three Hundred Two comes with two standard
fans (yellow outline) –a rear 120 mm TwoCool fan
and a top 140 mm TwoCool fan.
The red rectangles indicate additional fan mounts.
Mounting procedures for these fans is discussed in
Section 4.2.
120 mm TwoCool Specifications
Size : 120 x 25 mm TwoCool™ fan
Rated Voltage : 12V
Operating Voltage : 10.8V ~ 13.2V
Speed
(RPM)
Input
Current
Airflow
Static
Pressure
Acoustic
Noise
Input
Power
High
1200
0.20A
(Max.)
1.2 m³ / min
(42.6 CFM)
0.96 mm-H2O
(0.037 inch-H2O)
23.7 dBA
2.4W
Low
600
0.10A
0.6 m³ / min
(21.3 CFM)
0.24 mm-H2O
(0.009 inch-H2O)
17.0 dBA
1.2W
140 mm TwoCool Specifications
Size: 140 x 25 mm TwoCool™
Rated Voltage: 12V
Operating Voltage: 10.8V ~ 13.2 V
Speed
(RPM)
Input
Current
Airflow
Static
Pressure
Acoustic
Noise
Input
Power
High
1200
0.3A
(Max.)
1.7 m³ / min
(58.9 CFM)
0.8 mm-H2O
(0.03 inch-H2O)
26.0 dBA
3.6W
Low
800
0.2A
0.95 m³ / min
(33.6 CFM)
0.3 mm-H2O
(0.01 inch-H2O)
21.8 dBA
2.4W