The information in this User’s Manual has been carefully reviewed and is believed to be accurate.
The vendor assumes no responsibility for any inaccuracies that may be contained in this document,
makes no commitment to update or to keep current the information in this manual, or to notify any
person or organization of the updates. Please Note: For the most up-to-date version of this
manual, please see our web site at www.supermicro.com.
Super Micro Computer, Inc. ("Supermicro") reserves the right to make changes to the product
described in this manual at any time and without notice. This product, including software and
documentation, is the property of Supermicro and/or its licensors, and is supplied only under a
license. Any use or reproduction of this product is not allowed, except as expressly permitted by
the terms of said license.
IN NO EVENT WILL SUPERMICRO BE LIABLE FOR DIRECT, INDIRECT , SPECIAL, INCIDENTAL,
SPECULATIVE OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OR INABILITY TO
USE THIS PRODUCT OR DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES. IN PARTICULAR, SUPERMICRO SHALL NOT HAVE LIABILITY FOR ANY
HARDWARE, SOFTW ARE, OR DA TA STORED OR USED WITH THE PRODUCT, INCLUDING THE
COSTS OF REPAIRING, REPLACING, INTEGRATING, INSTALLING OR RECOVERING SUCH
HARDWARE, SOFTWARE, OR DATA.
Any disputes arising between manufacturer and customer shall be governed by the laws of Santa
Clara County in the State of California, USA. The State of California, County of Santa Clara shall
be the exclusive venue for the resolution of any such disputes. Super Micro's total liability for
all claims will not exceed the price paid for the hardware product.
FCC Statement: This equipment has been tested and found to comply with the limits for a Class
A digital device pursuant to Part 15 of the 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 manufacturer’s instruction manual, may cause harmful
interference with radio communications. Operation of this equipment in a residential area is likely
to cause harmful interference, in which case you will be required to correct the interference at your
own expense.
California Best Management Practices Regulations for Perchlorate Materials: This Perchlorate
warning applies only to products containing CR (Manganese Dioxide) Lithium coin cells. “Perchlorate
Material-special handling may apply. See www.dtsc.ca.gov/hazardouswaste/perchlorate”
WARNING: Handling of lead solder materials used in this
product may expose you to lead, a chemical known to
the State of California to cause birth defects and other
reproductive harm.
Manual Revision 1.0b
Release Date: March 11, 2010
Unless you request and receive written permission from Super Micro Computer, Inc., you may not
copy any part of this document.
Information in this document is subject to change without notice. Other products and companies
referred to herein are trademarks or registered trademarks of their respective companies or mark
holders.
This manual is written for professional system integrators and PC technicians. It provides information for the installation and use of the SuperServer 6026T-URF. Installation and maintainance should be performed by experienced technicians only.
The SuperServer 6026T-URF is a high-end server based on the SC825TQ-R720UB
2U rackmount chassis and the X8DTU-F dual processor serverboard.
Manual Organization
Chapter 1: Introduction
Preface
The fi rst chapter provides a checklist of the main components included with the
server system and describes the main features of the X8DTU-F serverboard and
the SC825TQ-R720UB chassis.
Chapter 2: Server Installation
This chapter describes the steps necessary to install the SuperServer 6026T-URF
into a rack and check out the server confi guration prior to powering up the system.
If your server was ordered without processor and memory components, this chapter
will refer you to the appropriate sections of the manual for their installation.
Chapter 3: System Interface
Refer here for details on the system interface, which includes the functions and
information provided by the control panel on the chassis as well as other LEDs
located throughout the system.
Chapter 4: System Safety
You should thoroughly familiarize yourself with this chapter for a general overview
of safety precautions that should be followed when installing and servicing the
SuperServer 6026T-URF.
iii
SUPERSERVER 6026T-URF User's Manual
Chapter 5: Advanced Serverboard Setup
Chapter 5 provides detailed information on the X8DTU-F serverboard, including the
locations and functions of connections, headers and jumpers. Refer to this chapter
when adding or removing processors or main memory and when reconfi guring the
serverboard.
Chapter 6: Advanced Chassis Setup
Refer to Chapter 6 for detailed information on the SC825TQ-R720UB server chassis.
You should follow the procedures given in this chapter when installing, removing
or reconfi guring SAS/SATA or peripheral drives and when replacing system power
supply units and cooling fans.
Chapter 7: BIOS
The BIOS chapter includes an introduction to BIOS and provides detailed information on running the CMOS Setup Utility.
Appendix A BIOS Error Beep Codes
Appendix B Installing Windows
Appendix C System Specifi cations
viii
Chapter 1: Introduction
Chapter 1
Introduction
1-1 Overview
The SuperServer 6026T-URF is a high-end server comprised of two main subsystems: the SC825TQ-R720UB 2U server chassis and the X8DTU-F dual processor
serverboard. Please refer to our web site for information on operating systems that
have been certifi ed for use with the system (www.supermicro.com).
In addition to the serverboard and chassis, various hardware components have
been included with the 6026T-URF, as listed below:
One slim DVD-ROM drive (DVM-TEAC-DVD-SBT)
•
One SATA to USB adapter for slim DVD-ROM drive (CDM-USATA-G)•
One internal USB cable for DVD-ROM drive (CBL-0341L)•
Three 8-cm chassis fans (FAN-0094L4)•
Two passive CPU heatsinks (SNK-P0038P)•
One air shroud (MCP-310-28001-0N)•
One riser card (RSC-R2UU-UA3E8+)•
SAS/SATA Accessories •
One SAS/SATA backplane (BPN-SAS-825TQ)
Two iPass to SATA cables (CBL-0188L)
Eight drive carriers (MCP-220-00001-01)
One rackmount kit (MCP-290-00053-0N)
•
One CD containing drivers and utilities•
SuperServer 6026T-URF User's Manual•
1-1
SUPERSERVER 6026T-URF User's Manual
1-2 Serverboard Features
At the heart of the SuperServer 6026T-URF lies the X8DTU-F, a dual processor
serverboard based on the Intel® 5520 (North Bridge) + ICH10R (South Bridge)
chipset. Below are the main features of the X8DTU-F. (See Figure 1-1 for a block
diagram of the chipset).
Processors
The X8DTU-F supports single or dual two Intel® 5500 Series processors in
LGA1366 sockets. Please refer to our web site for a complete listing of supported
processors (www.supermicro.com).
Memory
The X8DTU-F has twelve 240-pin DIMM sockets that can support up to 192 GB of
registered ECC DDR3-1333/1066/800 SDRAM or 24 GB of unbuffered ECC DDR31333/1066/800 SDRAM. Please refer to Chapter 5 for installing memory.
UIO
The X8DTU-F is a specially-designed serverboard that features Supermicro's UIO
(Universal I/O) technology. UIO serverboards have a PCI Express x8 slot that can
suppor t any on e of several t ype s of UIO c ard t ypes to ad d SAS po rt s, addit ional
LAN ports, etc. to the serverboard. This allows the user to tailor the serverboard
to their ow n need s.
Note: the ser ver does n ot com e with a UI O card i nstal led.
Serial ATA
An on-chip (ICH10R) SATA controller is integrated into the X8DTU-F to provide a
six-po rt, 3 G b/se c SATA subsystem, which is RAI D 0, 1, 5 and 10 suppo rted. Th e
SATA drives are ho t-swap pable u nits.
Note: You must have RAID set up to enable the hot-swap capability of the SATA
drives. D ocum entati on on R AI D setup gui deline s can be fo und on our we b site.
Onboard Controllers/Ports
The color-coded I/O ports include one COM port, a VGA (monitor) port, two USB
2.0 ports, PS/2 mouse and keyboard ports and two gigabit Ethernet ports.
1-2
Chapter 1: Introduction
Graphics Controller
The X8DTU-F features an integrated Matrox G200eW graphics chip, which includes
8 MB of DDR2 memory.
Other Features
Other onboard features that promote system health include onboard voltage monitors, auto-switching voltage regulators, chassis and CPU overheat sensors, virus
protection and BIOS rescue.
1-3 Server Chassis Features
The 6026T-URF is built upon the SC825TQ-R720UB chassis. Details on the chassis
and on servicing procedures can be found in Chapter 6. The following is a general
outline of the main features of the chassis.
System Power
The SC825TQ-R720UB features a redundant 720W power supply consisting of
two power modules. The system does not need to be shut down when replacing or
removing a single power supply module.
Hard Drive Subsystem
The SC825TQ-R720UB cha ss is was d es ig ned t o sup po rt eigh t hot - swap S ATA or
SAS hard d rives. ( Require s UIO c ontro ller c ard - not in clud ed with sy stem.)
Note: A SAS or SATA UIO card must be installed to support SAS or SATA
drives.
Front Control Panel
The control panel on the SuperServer 6026T-URF provides you with system monitoring and control. LEDs indicate system power, HDD activity, network activity, system
overheat and power supply failure. A main power button and a system reset button
are also included. In addition, two USB ports have been incorporated into the control
panel to provide front side USB access.
I/O Backplane
The SC825TQ-R720UB is an ATX form factor chassis designed to be used in a 2U
rackmount confi guration. The I/O backplane provides four standard-size add-on card
slots, one COM port, a VGA port, two USB 2.0 ports, PS/2 mouse and keyboard
ports, a dedicated IPMI LAN port and two gigabit Ethernet ports.
1-3
SUPERSERVER 6026T-URF User's Manual
Cooling System
The SC825TQ-R720UB chassis has an innovative cooling design that includes three
8-cm hot-plug system cooling fans located in the middle section of the chassis. An
air shroud channels the airfl ow from the system fans to effi ciently cool the processor
area of the system. The power supply module also includes a cooling fan.
1-4
Chapter 1: Introduction
Figure 1-1. Intel 5520/ICH10R Chipset:
System Block Diagram
Note: This is a general block diagram. Please see Chapter 5 for details.
Tel: +886-(2) 8226-3990
Fax: +886-(2) 8226-3991
Web Site:www.supermicro.com.tw
Technical Support:
Email:support@supermicro.com.tw
Tel: 886-2-8228-1366, ext.132 or 139
1-6
Chapter 2: Server Installation
Chapter 2
Server Installation
2-1 Overview
This chapter provides a quick setup checklist to get your SuperServer 6026T-URF
up and running. Following these steps in the order given should enable you to have
the system operational within a minimum amount of time. This quick setup assumes
that your system has come to you with the processors and memory preinstalled. If
your system is not already fully integrated with a serverboard, processors, system
memory etc., please turn to the chapter or section noted in each step for details on
installing specifi c components.
2-2 Unpacking the System
You should inspect the box the SuperServer 6026T-URF was shipped in and note
if it was damaged in any way. If the server itself shows damage you should fi le a
damage claim with the carrier who delivered it.
Decide on a suitable location for the rack unit that will hold the SuperServer 6026TURF. It should be situated in a clean, dust-free area that is well ventilated. Avoid
areas where heat, electrical noise and electromagnetic fi elds are generated. You
will also need it placed near a grounded power outlet. Read the Rack and Server
Precautions in the next section.
2-3 Preparing for Setup
The box the SuperServer 6026T-URF was shipped in should include two sets of
rail assemblies, two rail mounting brackets and the mounting screws you will need
to install the system into the rack. Follow the steps in the order given to complete
the installation process in a minimum amount of time. Please read this section in
its entirety before you begin the installation procedure outlined in the sections that
follow.
Choosing a Setup Location
Leave enough clearance in front of the rack to enable you to open the front door •
completely (~25 inches) and approximately 30 inches of clearance in the back
of the rack to allow for suffi cient airfl ow and ease in servicing.
2-1
SUPERSERVER 6026T-URF User's Manual
!
!
This product is for installation only in a Restricted Access Location (dedicated •
equipment rooms, service closets and the like).
This product is not suitable for use with visual display work place devices
•
acccording to §2 of the the German Ordinance for Work with Visual Display
Units.
Warnings and Precautions!
Rack Precautions
Ensure that the leveling jacks on the bottom of the rack are fully extended to •
the fl oor with the full weight of the rack resting on them.
In single rack installation, stabilizers should be attached to the rack. In multiple
•
rack installations, the racks should be coupled together.
Always make sure the rack is stable before extending a component from the
•
rack.
You should extend only one component at a time - extending two or more si-
•
multaneously may cause the rack to become unstable.
Server Precautions
Review the electrical and general safety precautions in Chapter 4.•
Determine the placement of each component in the rack • before you install the
rails.
Install the heaviest server components on the bottom of the rack fi rst, and then
•
work up.
Use a regulating uninterruptible power supply (UPS) to protect the server from
•
power surges, voltage spikes and to keep your system operating in case of a
power failure.
Allow any hot plug drives and power supply modules to cool before touching
•
them.
Always keep the rack's front door and all panels and components on the servers
•
closed when not servicing to maintain proper cooling.
2-2
Chapter 2: Server Installation
Rack Mounting Considerations
Ambient Operating Temperature
If installed in a closed or multi-unit rack assembly, the ambient operating temperature of the rack environment may be greater than the ambient temperature of the
room. Therefore, consideration should be given to installing the equipment in an
environment compatible with the manufacturer’s maximum rated ambient temperature (Tmra).
Reduced Airfl ow
Equipment should be mounted into a rack so that the amount of airfl ow required
for safe operation is not compromised.
Mechanical Loading
Equipment should be mounted into a rack so that a hazardous condition does not
arise due to uneven mechanical loading.
Circuit Overloading
Consideration should be given to the connection of the equipment to the power
supply circuitry and the effect that any possible overloading of circuits might have
on overcurrent protection and power supply wiring. Appropriate consideration of
equipment nameplate ratings should be used when addressing this concern.
Reliable Ground
A reliable ground must be maintained at all times. To ensure this, the rack itself
should be grounded. Particular attention should be given to power supply connections other than the direct connections to the branch circuit (i.e. the use of power
strips, etc.).
2-3
SUPERSERVER 6026T-URF User's Manual
2-4 Installing the System into a Rack
This section provides information on installing the SC825 chassis into a rack unit
with the quick-release rails provided. There are a variety of rack units on the market,
which may mean the assembly procedure will differ slightly. You should also refer to
the installation instructions that came with the rack unit you are using.
Note: This rail will fi t a rack between 26" and 33.5" deep.
Separating the Sections of the Rack Rails
The chassis package includes two rail assemblies in the rack mounting kit. Each
assembly consists of two sections: an inner fi xed chassis rail that secures directly
to the server chassis and an outer fi xed rack rail that secures directly to the rack
itself.
Installing the Inner Rail Extension
The SC825 chassis includes a set of inner rails in two sections: inner rails and inner
rail extensions. The inner rails are pre-attached to the chassis, and do not interfere
with normal use of the chassis if you decide not to use a server rack. The inner rail
extension is attached to the inner rail to mount the chassis in the rack.
Installing the Inner Rails
Place the inner rail extensions on the side of the chassis aligning the hooks 1.
of the chassis with the rail extension holes. Make sure the extension faces
"outward" just like the pre-attached inner rail.
Slide the extension toward the front of the chassis.2.
Secure the chassis with 2 screws as illustrated. Repeat steps for the other 3.
inner rail extension.
2-4
Chapter 2: Server Installation
Figure 2-1: Separating the Rack Rails
1
1
2
1
3
1
4
1
Rail Assembly
Extending the Rails
Quick-
Release Tab
Separating
the Inner Rail
Extension
Separating the Inner and Outer Rails
Locate the rail assembly in the chassis 1.
packaging.
Extend the rail assembly by pulling it 2.
outward.
Press the quick-release tab.3.
Separate the inner rail extension from 4.
the outer rail assembly.
2-5
SUPERSERVER 6026T-URF User's Manual
3
1
1
1
2
1
Figure 2-2. Assembling the Outer Rails
Outer Rack Rails
Outer rails attach to the rack and hold the chassis in place. The outer rails for the
SC825 chassis extend between 30 inches and 33 inches.
Installing the Outer Rails to the Rack
Secure the back end of the outer rail to the rack, using the screws provided. 1.
Press the button where the two outer rails are joined to retract the smaller 2.
outer rail.
Hang the hooks of the rails onto the rack holes and if desired, use screws to 3.
secure the front of the outer rail onto the rack.
Repeat steps 1-3 for the remaining outer rail.4.
2-6
Chapter 2: Server Installation
Figure 2-3. Installing the Rack Rails
Installing the Chassis into a Rack
Extend the outer rails as illustrated above. 1.
Align the inner rails of the chassis with the outer rails on the rack.2.
Slide the inner rails into the outer rails, keeping the pressure even on both 3.
sides. When the chassis has been pushed completely into the rack, it should
click into the locked position.
Optional screws may be used to secure the to hold the front of the chassis to 4.
the rack.
2-7
SUPERSERVER 6026T-URF User's Manual
2-5 Checking the Serverboard Setup
After you install the 6026T-URF in the rack, you will need to open the unit to
make sure the serverboard is properly installed and all the connections have been
made.
Accessing the inside of the System
First, grasp the two handles on either side and pull the unit straight out until it 1.
locks (you will hear a "click").
Next, depress the two buttons on the top of the chassis to release the top 2.
cover.
You can then lift the top cover from the chassis to gain full access to the 3.
inside of the server.
Checking the Components and Setup
You may have one or two processors already installed into the serverboard. 1.
Each processor needs its own heat sink. See Chapter 5 for instructions on
processor and heat sink installation.
Your 6026T-URF server system may have come with system memory already 2.
installed. Make sure all DIMMs are fully seated in their slots. For details on
adding system memory, refer to Chapter 5.
If desired, you can install add-on cards to the system. See Chapter 5 for 3.
details on installing PCI add-on cards.
Make sure all power and data cables are properly connected and not blocking 4.
the chassis airfl ow. Also make sure that no cables are positioned in front of
the fans. See Chapter 5 for details on cable connections.
2-8
Chapter 2: Server Installation
Figure 2-3. Accessing the Inside of the System
2-9
SUPERSERVER 6026T-URF User's Manual
2-6 Checking the Drive Bay Setup
Next, you should check to make sure the peripheral drives and the SAS/SA TA drives
have been properly installed and all connections have been made.
Checking the Drives
All drives are accessable from the front of the server. For servicing the DVD-1.
ROM, you will need to remove the top chassis cover. The hard drives can be
installed and removed from the front of the chassis without removing the top
chassis cover.
A slim DVD-ROM may be preinstalled in your server. Refer to Chapter 6 if 2.
you need to install a DVD-ROM drive to the system.
Depending upon your system's confi guration, your system may have one or 3.
more drives already installed. If you need to install hard drives, please refer to
Chapter 6.
Checking the Airfl ow
Airfl ow is provided by three hot-swappable 8-cm chassis cooling fans. The 1.
system component layout was carefully designed to direct suffi cient cooling
airfl ow to the components that generate the most heat.
Note that all power and data cables have been routed in such a way that they 2.
do not block the airfl ow generated by the fans.
Providing Power
Plug the power cord(s) from the power supply unit(s) into a high-quality power 1.
strip that offers protection from electrical noise and power surges. It is recommended that you use an uninterruptible power supply (UPS).
Depress the power on button on the front of the chassis. 2.
2-10
Chapter 3: System Interface
Chapter 3
System Interface
3-1 Overview
There are several LEDs on the control panel as well as others on the drive carriers to keep you constantly informed of the overall status of the system as well as
the activity and health of specifi c components. There are also two buttons on the
chassis control panel.
3-2 Control Panel Buttons
There are two buttons located on the front of the chassis: a reset button and a
power on/off button.
Reset
Use the reset button to reboot the system.
Power
This is the main power button, which is used to apply or turn off the main system
power. T urning off system power with this button removes the main power but keeps
standby power supplied to the system.
3-1
SUPERSERVER 6026T-URF User's Manual
3-3 Control Panel LEDs
The control panel located on the front of the chassis has several LEDs. These
LEDs provide you with critical information related to different parts of the system.
This section explains what each LED indicates when illuminated and any corrective
action you may need to take.
Power Fail
Indicates a power supply module has failed. The second power supply module will
take the load and keep the system running but the failed module will need to be
replaced. Refer to Chapter 6 for details on replacing the power supply. This LED
should be off when the system is operating normally.
Overheat/Fan Fail:
When this LED fl ashes, it indicates a fan failure. When on continuously it indicates
an overheat condition, which may be caused by cables obstructing the airfl ow in
the system or the ambient room temperature being too warm. Check the routing of
the cables and make sure all fans are present and operating normally. You should
also check to make sure that the chassis covers are installed. Finally, verify that
the heatsinks are installed properly (see Chapter 5). This LED will remain fl ashing
or on as long as the indicated condition exists.
1
NIC1
Indicates network activity on the LAN1 port when fl ashing.
2
NIC2
Indicates network activity on the LAN2 port when fl ashing.
3-2
Chapter 3: System Interface
HDD
On the SuperServer 6026T-URF, this LED indicates hard drive and/or DVD-ROM
drive activity when fl ashing.
Power
Indicates power is being supplied to the system's power supply units. This LED
should normally be illuminated when the system is operating.
3-4 Drive Carrier LEDs
Each drive carrier has two LEDs:
SATA Drives
Green:• When ill uminated, the green LED on the SATA drive carr ier indic ates
drive ac tivity. A con nectio n to the SATA backpla ne enables t his LED to blin k
on and off when that particular drive is being accessed. Please refer to Chapter
6 for instructions on replacing failed SATA drives.
Red:
• When this LED fl ashes it indicates the drive is rebuilding. When solid on
it indicates a SATA drive failure. If a drive fails, you should be notifi ed by your
system management software. Please refer to Chapter 6 for instructions on
replacing failed drives.
SAS Drives
Green:• When illuminated, the green LED on the drive carrier indicates the SAS
drive is powered on. If this LED is not lit, it means no power is being provided for
the dri ve. Please refer to Chapter 6 for instructions on replacing failed drives.
Red:
• When this LED fl ashes it indicates the drive is rebuilding. When solid on
it indicates a SAS drive failure. If a drive fails, you should be notifi ed by your
system management software. Please refer to Chapter 6 for instructions on
replacing failed drives.
3-3
SUPERSERVER 6026T-URF User's Manual
Notes
3-4
Chapter 4: System Safety
!
Chapter 4
System Safety
4-1 Electrical Safety Precautions
Basic electrical safety precautions should be followed to protect yourself from harm
and the SuperServer 6026T-URF from damage:
Be aware of the locations of the power on/off switch on the chassis as well
•
as the room's emergency power-off switch, disconnection switch or electrical
outlet. If an electrical accident occurs, you can then quickly remove power from
the system.
Do not work alone when working with high voltage components.
•
Power should always be disconnected from the system when removing or in-•
stalling main system components, such as the serverboard, memory modules
and fl oppy drive. When disconnecting power, you should fi rst power down the
system with the operating system fi rst and then unplug the power cords of all
the power supply units in the system.
When working around exposed electrical circuits, another person who is familiar
•
with the power-off controls should be nearby to switch off the power if necessary.
Use only one hand when working with powered-on electrical equipment. This
•
is to avoid making a complete circuit, which will cause electrical shock. Use
extreme caution when using metal tools, which can easily damage any electrical
components or circuit boards they come into contact with.
Do not use mats designed to decrease static electrical discharge as protection
•
from electrical shock. Instead, use rubber mats that have been specifi cally
designed as electrical insulators.
The power supply power cords must include a grounding plug and must be
•
plugged into grounded electrical outlets.
4-1
SUPERSERVER 6026T-URF User's Manual
!
Serverboard Battery: • CAUTION - There is a danger of explosion if the onboard
battery is installed upside down, which will reverse its polarites (see Figure
4-1). This battery must be replaced only with the same or an equivalent type
recommended by the manufacturer. Dispose of used batteries according to the
manufacturer's instructions.
DVD-ROM Laser:
• CAUTION - this server may have come equipped with a
DVD-ROM drive. To prevent direct exposure to the laser beam and hazardous
radiation exposure, do not open the enclosure or use the unit in any unconventional way.
ture Coeffi cient) fuses on the mainboard must be replaced by trained service
technicians only. The new fuse must be the same or equivalent as the one
replaced. Contact technical support for details and support.
4-2 General Safety Precautions
Follow these rules to ensure general safety:
Keep the area around the 6026T-URF clean and free of clutter.
•
The 6026T-URF weighs approximately 57 lbs (25.9 kg.) when fully loaded. •
When lifting the system, two people at either end should lift slowly with their
feet spread out to distribute the weight. Always keep your back straight and lift
with your legs.
Place the chassis top cover and any system components that have been re-
•
moved away from the system or on a table so that they won't accidentally be
stepped on.
While working on the system, do not wear loose clothing such as neckties and
•
unbuttoned shirt sleeves, which can come into contact with electrical circuits or
be pulled into a cooling fan.
Remove any jewelry or metal objects from your body, which are excellent metal
•
conductors that can create short circuits and harm you if they come into contact
with printed circuit boards or areas where power is present.
4-2
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