Nexcom EBC 355A User manual

NEXCOM International Co., Ltd.
NEXCOM International Co., Ltd.
Published July 2018 www.nexcom.com
Intelligent Platform & Services Business Unit
Embedded Computing (3.5” CPU Board)
EBC 355A
User Manual

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. ii EBC 355A User Manual
Content
Contents
Preface
Copyright ............................................................................................. iv
Disclaimer.............................................................................................. iv
Acknowledgements ............................................................................... iv
Regulatory Compliance Statements........................................................ iv
Declaration of Conformity...................................................................... iv
RoHS Compliance ................................................................................... v
Warranty and RMA ................................................................................ vi
Safety Information ................................................................................viii
Installation Recommendations...............................................................viii
Safety Precautions.................................................................................. ix
Technical Support and Assistance............................................................ x
Conventions Used in this Manual............................................................ x
Global Service Contact Information........................................................ xi
Package Contents.................................................................................xiii
Ordering Information ............................................................................xiv
Chapter 1: Product Introduction
Overview ................................................................................................1
Key Features ...........................................................................................1
Hardware Specifications..........................................................................2
Knowing Your EBC 355A ........................................................................3
Location of Connectors and Headers (Top View) ..................................3
Location of Jumpers (Top View) ...........................................................4
Edge I/O View......................................................................................5
Chapter 2: Jumpers and Connectors
Before You Begin ....................................................................................6
Precautions ............................................................................................6
Jumper Settings ......................................................................................7
Locations of the Jumpers and Connectors...............................................8
Jumpers..................................................................................................9
LVDS LCD VCC 3.3V/5V/12V Select......................................................9
LVDS Inverter VCC 5V/12V/Adapter VCC Select ...................................9
eDP LCD VCC 3.3V/5V/12V Select .....................................................10
eDP Backlight VCC 3.3V/5V/Adapter VCC Select ...............................10
COM4 Header Pin-9 Function Select..................................................11
COM3 Header Pin-9 Function Select..................................................11
COM2 Header Pin-9 Function Select..................................................12
COM1 Header Pin-9 Function Select..................................................12
CMOS Clear Select ............................................................................13
Case Open Message Display Function Select ......................................13
AT/ATX Mode Select..........................................................................14
Security Measure Function Select.......................................................14
Connector Pin Definitions .....................................................................15
Internal Connectors...........................................................................15
SATAII Connector ...........................................................................15
SATA Power Connector..................................................................15
CPU Fan Connector........................................................................16
LVDS Inverter Connector ................................................................16
Front Panel Audio: Line-out and Mic-in ..........................................17
SPDIF Out Header...........................................................................17

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. iii EBC 355A User Manual
Content
COM1 to COM4 Headers...............................................................18
GPIO Header..................................................................................18
USB 2.0 Headers ............................................................................19
SMBUS Header...............................................................................19
PS/2 Keyboard & Mouse Header.....................................................20
Front Panel Header.........................................................................20
LAN Activity LED Headers...............................................................21
24-bit Dual Channel LVDS Header ..................................................21
eDP Header....................................................................................22
Block Diagram .................................................................................23
Chapter 3: BIOS Setup
About BIOS Setup.................................................................................24
When to Configure the BIOS.................................................................24
Default Configuration...........................................................................25
Entering Setup......................................................................................25
Legends................................................................................................25
BIOS Setup Utility..................................................................................27
Main .................................................................................................27
Advanced .........................................................................................28
Chipset..............................................................................................39
Security .............................................................................................42
Boot..................................................................................................43
Save & Exit ........................................................................................44

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. iv EBC 355A User Manual
Preface
PrefaCe
Copyright
This publication, including all photographs, illustrations and software, is
protected under international copyright laws, with all rights reserved. No
part of this manual may be reproduced, copied, translated or transmitted in
any form or by any means without the prior written consent from NEXCOM
International Co., Ltd.
Disclaimer
The information in this document is subject to change without prior notice and
does not represent commitment from NEXCOM International Co., Ltd. However,
users may update their knowledge of any product in use by constantly checking
its manual posted on our website: http://www.nexcom.com. NEXCOM shall
not be liable for direct, indirect, special, incidental, or consequential damages
arising out of the use of any product, nor for any infringements upon the rights
of third parties, which may result from such use. Any implied warranties of
merchantability or fitness for any particular purpose is also disclaimed.
Acknowledgements
EBC 355A is a trademark of NEXCOM International Co., Ltd. All other
product names mentioned herein are registered trademarks of their
respective owners.
Regulatory Compliance Statements
This section provides the FCC compliance statement for Class B devices and
describes how to keep the system CE compliant.
Declaration of Conformity
FCC
This equipment has been tested and verified to comply with the limits for
a Class B digital device, pursuant to Part 15 of FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference
to radio communications. Operation of this equipment in a residential area
(domestic environment) is likely to cause harmful interference, in which
case the user will be required to correct the interference (take adequate
measures) at their own expense.
CE
The product(s) described in this manual complies with all applicable
European Union (CE) directives if it has a CE marking. For computer systems
to remain CE compliant, only CE-compliant parts may be used. Maintaining
CE compliance also requires proper cable and cabling techniques.

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. vEBC 355A User Manual
Preface
RoHS Compliance
NEXCOM RoHS Environmental Policy and Status
Update
NEXCOM is a global citizen for building the digital
infrastructure. We are committed to providing green
products and services, which are compliant with
European Union RoHS (Restriction on Use of Hazardous Substance in
Electronic Equipment) directive 2011/65/EU, to be your trusted green
partner and to protect our environment.
RoHS restricts the use of Lead (Pb) < 0.1% or 1,000ppm, Mercury (Hg)
< 0.1% or 1,000ppm, Cadmium (Cd) < 0.01% or 100ppm, Hexavalent
Chromium (Cr6+) < 0.1% or 1,000ppm, Polybrominated biphenyls (PBB) <
0.1% or 1,000ppm, and Polybrominated diphenyl Ethers (PBDE) < 0.1% or
1,000ppm.
In order to meet the RoHS compliant directives, NEXCOM has established an
engineering and manufacturing task force in to implement the introduction
of green products. The task force will ensure that we follow the standard
NEXCOM development procedure and that all the new RoHS components
and new manufacturing processes maintain the highest industry quality
levels for which NEXCOM are renowned.
The model selection criteria will be based on market demand. Vendors and
suppliers will ensure that all designed components will be RoHS compliant.
How to recognize NEXCOM RoHS Products?
For existing products where there are non-RoHS and RoHS versions, the
suffix “(LF)” will be added to the compliant product name.
All new product models launched after January 2013 will be RoHS compliant.
They will use the usual NEXCOM naming convention.

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. vi EBC 355A User Manual
Preface
Warranty and RMA
NEXCOM Warranty Period
NEXCOM manufactures products that are new or equivalent to new in
accordance with industry standard. NEXCOM warrants that products will
be free from defect in material and workmanship for 2 years, beginning on
the date of invoice by NEXCOM. HCP series products (Blade Server) which
are manufactured by NEXCOM are covered by a three year warranty period.
NEXCOM Return Merchandise Authorization (RMA)
▪Customers shall enclose the “NEXCOM RMA Service Form” with the
returned packages.
▪Customers must collect all the information about the problems
encountered and note anything abnormal or, print out any on-screen
messages, and describe the problems on the “NEXCOM RMA Service
Form” for the RMA number apply process.
▪Customers can send back the faulty products with or without accessories
(manuals, cable, etc.) and any components from the card, such as CPU
and RAM. If the components were suspected as part of the problems,
please note clearly which components are included. Otherwise, NEXCOM
is not responsible for the devices/parts.
▪Customers are responsible for the safe packaging of defective products,
making sure it is durable enough to be resistant against further damage
and deterioration during transportation. In case of damages occurred
during transportation, the repair is treated as “Out of Warranty.”
▪Any products returned by NEXCOM to other locations besides the
customers’ site will bear an extra charge and will be billed to the customer.
Repair Service Charges for Out-of-Warranty Products
NEXCOM will charge for out-of-warranty products in two categories, one is
basic diagnostic fee and another is component (product) fee.
Repair Service Charges for Out-of-Warranty Products
NEXCOM will charge for out-of-warranty products in two categories, one is
basic diagnostic fee and another is component (product) fee.
System Level
▪Component fee: NEXCOM will only charge for main components such as
SMD chip, BGA chip, etc. Passive components will be repaired for free,
ex: resistor, capacitor.
▪Items will be replaced with NEXCOM products if the original one cannot
be repaired. Ex: motherboard, power supply, etc.
▪Replace with 3rd party products if needed.
▪If RMA goods can not be repaired, NEXCOM will return it to the customer
without any charge.
Board Level
▪Component fee: NEXCOM will only charge for main components, such
as SMD chip, BGA chip, etc. Passive components will be repaired for free,
ex: resistors, capacitors.
▪If RMA goods can not be repaired, NEXCOM will return it to the customer
without any charge.

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. vii EBC 355A User Manual
Preface
Warnings
Read and adhere to all warnings, cautions, and notices in this guide and
the documentation supplied with the chassis, power supply, and accessory
modules. If the instructions for the chassis and power supply are inconsistent
with these instructions or the instructions for accessory modules, contact
the supplier to find out how you can ensure that your computer meets
safety and regulatory requirements.
Cautions
Electrostatic discharge (ESD) can damage system components. Do the
described procedures only at an ESD workstation. If no such station is
available, you can provide some ESD protection by wearing an antistatic
wrist strap and attaching it to a metal part of the computer chassis.

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. viii EBC 355A User Manual
Preface
Installation Recommendations
Ensure you have a stable, clean working environment. Dust and dirt can get
into components and cause a malfunction. Use containers to keep small
components separated.
Adequate lighting and proper tools can prevent you from accidentally
damaging the internal components. Most of the procedures that follow
require only a few simple tools, including the following:
▪A Philips screwdriver
▪A flat-tipped screwdriver
▪A grounding strap
▪An anti-static pad
Using your fingers can disconnect most of the connections. It is recommended
that you do not use needle-nose pliers to disconnect connections as these
can damage the soft metal or plastic parts of the connectors.
Safety Information
Before installing and using the device, note the following precautions:
▪Read all instructions carefully.
▪Do not place the unit on an unstable surface, cart, or stand.
▪Follow all warnings and cautions in this manual.
▪When replacing parts, ensure that your service technician uses parts
specified by the manufacturer.
▪Avoid using the system near water, in direct sunlight, or near a heating
device.
▪The load of the system unit does not solely rely for support from the
rackmounts located on the sides. Firm support from the bottom is highly
necessary in order to provide balance stability.
▪The computer is provided with a battery-powered real-time clock circuit.
There is a danger of explosion if battery is incorrectly replaced. Replace
only with the same or equivalent type recommended by the manufacturer.
Discard used batteries according to the manufacturer’s instructions.

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. ix EBC 355A User Manual
Preface
Safety Precautions
1. Read these safety instructions carefully.
2. Keep this User Manual for later reference.
3. Disconnect the equipment from any AC outlet before cleaning or installing
a component inside the chassis. Use a damp cloth. Do not use liquid or
spray detergents for cleaning.
4. To prevent electrostatic build-up, leave the board in its anti-static bag
until you are ready to install it.
5. For plug-in equipment, the power outlet socket must be located near the
equipment and must be easily accessible.
6. Keep the board away from humidity.
7. Put the board on a stable surface. Dropping it or letting it fall may cause
damage.
8. Wear anti-static wrist strap.
9. Do all preparation work on a static-free surface.
10. Make sure the voltage of the power source is correct before
connecting the equipment to the power outlet.
11. Hold the board only by its edges. Be careful not to touch any of the
components, contacts or connections.
12. All cautions and warnings on the board should be noted.
13. Use the correct mounting screws and do not over tighten the screws.
14. Keep the original packaging and the anti-static bag; in case the board
has to be returned for repair or replacement.

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. xEBC 355A User Manual
Preface
Technical Support and Assistance
1. For the most updated information of NEXCOM products, visit NEXCOM’s
website at www.nexcom.com.
2. For technical issues that require contacting our technical support team or
sales representative, please have the following information ready before
calling:
– Product name and serial number
– Detailed information of the peripheral devices
– Detailed information of the installed software (operating system,
version, application software, etc.)
– A complete description of the problem
– The exact wordings of the error messages
Warning!
1. Handling the unit: carry the unit with both hands and handle it with care.
2. Maintenance: to keep the unit clean, use only approved cleaning products
or clean with a dry cloth.
Conventions Used in this Manual
Warning:
Information about certain situations, which if not observed,
can cause personal injury. This will prevent injury to yourself
when performing a task.
CAUTION!
CAUTION!CAUTION! Caution:
Information to avoid damaging components or losing data.
Note:
Provides additional information to complete a task easily.

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. xi EBC 355A User Manual
Preface
Global Service Contact Information
Headquarters
NEXCOM International Co., Ltd.
9F, No. 920, Chung-Cheng Rd.,
ZhongHe District, New Taipei City, 23586,
Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
www.nexcom.com
America
USA
NEXCOM USA
2883 Bayview Drive,
Fremont CA 94538, USA
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.com
Asia
Taiwan
NEXCOM Intelligent Systems
Taipei Office
13F, No.920, Chung-Cheng Rd.,
ZhongHe District,
New Taipei City, 23586, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.com.tw
NEXCOM Intelligent Systems
Taichung Office
16F, No.250, Sec. 2, Chongde Rd.,
Beitun Dist.,
Taichung City 406, R.O.C.
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.com.tw
Japan
NEXCOM Japan
9F, Tamachi Hara Bldg.,
4-11-5, Shiba Minato-ku,
Tokyo, 108-0014, Japan
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom-jp.com
China
NEXCOM China
Floor 5, No.4, No.7 fengxian middle Rd.,
(Beike Industrial Park), Haidian District,
Beijing, 100094, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.cn

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. xii EBC 355A User Manual
Preface
Europe
United Kingdom
NEXCOM EUROPE
10 Vincent Avenue,
Crownhill Business Centre,
Milton Keynes, Buckinghamshire
MK8 0AB, United Kingdom
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.eu
Italy
NEXCOM ITALIA S.r.l
Via Lanino 42,
21047 Saronno (VA), Italia
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcomitalia.it
NEXCOM Shanghai
Room 603/604, Huiyinmingzun Plaza Bldg., 1,
No.609, Yunlin East Rd.,
Shanghai, 200333, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.cn
NEXCOM Surveillance Technology Corp.
Room202, Building B,
the GuangMing Industrial Zone Zhonghua Rd.,
Minzhi Street, Longhua District,
Shenzhen 518131, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.cn
NEXCOM United System Service
Hui Yin Ming Zun Building Room 1108,
Building No. 11, 599 Yunling Road, Putuo District,
Shanghai, 200062, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.cn

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. xiii EBC 355A User Manual
Preface
Package Contents
Before continuing, verify that the EBC 355A package that you received is
complete. Your package should have all the items listed in the following
table.
Item Name Qty
1 EBC 355A 1
2 COM port cable 1
3 SATA + power cable 1
Optional Accessories
Item Part Number Name Description
1 7400060028X00 Power Adapter FSP:FSP060-DIBAN2 60W 12V/5A Level VI for McAfee
2 603COM0090X00 COM Port Cable for EBC 355A GREAT IDEAL:YXH17120801 9-pin to Housing 10-pin PIT:2.0mm Pin-10 Sealed L:200mm
3 603USB0084X00 USB Cable for EBC-355A ST:MD-5606151 USB CONx2 + Bracket to Dupont 10P PIT:2.0mm 200mm
4 60233ATA48X00 SATA Cable Best SATA CON 7P 180D to 180D Connector L:250mm 28AWG

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. xiv EBC 355A User Manual
Preface
Ordering Information
The following below provides ordering information for EBC 355A.
EBC 355A-N2930 (P/N: 10E00035514X0)
Onboard Intel Atom®Processor N2930, SoC w/DDR3L SO-DIMM, support
1 x VGA, 1 x eDP, 1 x LVDS, 2 x LAN, 1 x SATA, 1 x USB 3.0, 5 x USB 2.0,
1 x Line-out Jack, 1 x full-size mSATA/Mini-PCIe, 1 x half-size Mini-PCIe, DC
+9V~24V input
Optional Accessories
▪12V, 60W power adapter w/o power cord (P/N: 7400060028X00)
▪COM port cable (P/N: 6023309105P00)
▪USB cable (P/N: 603USB0084X00)

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. 1EBC 355A User Manual
Chapter 1: Product Introduction
ChaPter 1: ProduCt IntroduCtIon
Key Features
▪Onboard Intel Atom®Processor N2930, SoC w/DDR3L SO-DIMM
▪Support 1 x VGA, 1 x eDP, 1 x LVDS, 2 x LAN, 1 x SATA, 1 x USB 3.0,
7 x USB 2.0 and 1 x Line-out jack
▪Support 1 x full-size mSATA/Mini-PCIe and 1 x half-size Mini-PCIe
▪DC +9V~24V input
▪3.5” Fanless
▪Optional: Wi-Fi module/mSATA storage
Overview

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. 2EBC 355A User Manual
Chapter 1: Product Introduction
Hardware Specifications
CPU Support
▪Onboard Intel Atom®Processor N2930 SoC, dual core 1.8GHz, TDP: 7.5W
Display
▪1 x VGA connector (resolution up to 1920x1200 @ 60Hz)
▪1 x eDP connector (resolution up to 1920x1080 @ 60Hz)
▪1 x LVDS connector (resolution up to 1920x1080 @ 60Hz)
System
▪1 x DDR3L 1333MHz SO-DIMMs, up to 8GB.
▪2 x GbE LAN: Realtek 8111G GbE
▪4 x RS232, (3 x RS232, 1 x RS232/485/422 by COM1) with 5/12V
selectable header
▪1 x USB 3.0, 7 x USB 2.0 ports (3 x connector / 4 in header)
▪1 x HD Audio Jack (Line-out), 1 x SPDIF Out header
▪1 x Front panel audio header
▪Watchdog Timer 1~255 sec./min. programmable
▪1 x SMBUS header
▪1 x 8-bit GPIO (4-In/4-Out)
▪Support Chassis intrusion
▪1 x DC Jack input
BIOS
▪AMI 64Mb Flash ROM
Storage Device
▪1 x SATAII 3Gb/s
Expansion
▪2 x Mini PCI Express slots:
(Half-size supports PCIe/USB interface)
(Full-size supports mSATA and PCIe/USB interface)
Power Requirements
▪Single power 9~24V DC input
▪AT/ATX mode (by jumper setting, default: ATX)
Front I/O
▪2 x Button (ATX power on/off & Reset button)
▪2 x LAN LED activity header (Power & HDD LED)
Rear I/O
▪1 x HD Audio Jack
▪1 x double stack (1 USB 3.0 and 1 USB 2.0)
▪1 x VGA display output
▪1 x double stack USB 2.0
▪2 x RJ45 GbE controller
▪1 x DC jack input
Mechanical & Environment
▪Operating Temperature: 32°F ~ 140°F (0°C ~ 60°C)
▪Storage Temperature: -40°F ~ 185°F (-40°C ~ 85°C)
▪Relative Humidity: Operating 10%~90%, non-condensing
Dimension
▪Display Head: 3.5” SBC Form Factor (148mm * 102mm)
Operating System
▪Windows 7, Windows 8.1, Windows 10 (32/64-bit)
▪Linux
Certificate
▪EMC & Safety
▪CE/FCC (Class B)

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. 3EBC 355A User Manual
Chapter 1: Product Introduction
Knowing Your EBC 355A
Location of Connectors and Headers (Top View)
EDP
LVDS
Full-size
Mini-PCIe/mSATA
LAN LED
Half-size
Mini-PCIe
DDR3L
SO-DIMM
Front Panel Audio
PS/2 K/B
Mouse
Inverter
COM4
COM3
COM2
COM1
SPDIF Out
SATA Power
SATA II
GPIO
System
Front Panel
Reset
Button
Power
Button
CPU FanSMBUS USB 2.0

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. 4EBC 355A User Manual
Chapter 1: Product Introduction
Location of Jumpers (Top View)
COM4 Pin-9 Function Select
LVDS Inverter VCC Select
eDP LCD VCC SelecteDP Backlight VCC Select LVDS LCD VCC Select
COM3 Pin-9 Function Select
COM2 Pin-9 Function Select
COM1 Pin-9 Function Select
Case Open Message Display Function
Security Measure Function Select
CMOS Clear
AT/ATX Select

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. 5EBC 355A User Manual
Chapter 1: Product Introduction
Edge I/O View
RJ45 LAN Ports
9V~24V
DC Jack
Line-out VGA
USB 2.0
USB 3.0 USB 2.0

Copyright © 2018 NEXCOM International Co., Ltd. All Rights Reserved. 6EBC 355A User Manual
Chapter 2: Jumpers and Connectors
ChaPter 2: JumPers and ConneCtors
This chapter describes how to set the jumpers and connectors on the
EBC 355A motherboard.
Before You Begin
▪Ensure you have a stable, clean working environment. Dust and dirt can
get into components and cause a malfunction. Use containers to keep
small components separated.
▪Adequate lighting and proper tools can prevent you from accidentally
damaging the internal components. Most of the procedures that follow
require only a few simple tools, including the following:
– A Philips screwdriver
– A flat-tipped screwdriver
– A set of jewelers screwdrivers
– A grounding strap
– An anti-static pad
▪Using your fingers can disconnect most of the connections. It is
recommended that you do not use needle-nosed pliers to disconnect
connections as these can damage the soft metal or plastic parts of the
connectors.
▪Before working on internal components, make sure that the power is off.
Ground yourself before touching any internal components, by touching
a metal object. Static electricity can damage many of the electronic
components. Humid environments tend to have less static electricity than
dry environments. A grounding strap is warranted whenever danger of
static electricity exists.
Precautions
Computer components and electronic circuit boards can be damaged by
discharges of static electricity. Working on computers that are still connected
to a power supply can be extremely dangerous.
Follow the guidelines below to avoid damage to your computer or yourself:
▪Always disconnect the unit from the power outlet whenever you are
working inside the case.
▪If possible, wear a grounded wrist strap when you are working inside the
computer case. Alternatively, discharge any static electricity by touching
the bare metal chassis of the unit case, or the bare metal body of any
other grounded appliance.
▪Hold electronic circuit boards by the edges only. Do not touch the
components on the board unless it is necessary to do so. Don’t flex or
stress the circuit board.
▪Leave all components inside the static-proof packaging that they shipped
with until they are ready for installation.
▪Use correct screws and do not over tighten screws.