IBM 7940, 7941 Problem Determination And Service Manual
IBM Sys te m x3455 Type 7940 and 7941
P roble m Dete rminatio n an d Se rvi ce Guide
IBM Sys te m x3455 Type 7940 and 7941
P roble m Dete rminatio n an d Se rvi ce Guide
Note: Before using this information and the product it supports, read the general information in Appendix B, “Notices,” on page 127
and the Warranty and Support Information document on the IBM System x Documentation CD.
Fourth Edition (March 2009)
© Copyright International Business Machines Corporation 2007.
US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract
with IBM Corp.
Contents
Safety ............................vii
Guidelines for trained service technicians ...............viii
Inspecting for unsafe conditions .................viii
Guidelines for servicing electrical equipment .............viii
Safety statements ........................x
Chapter 1. Introduction ......................1
Related documentation ......................1
Notices and statements in this document ................2
Features and specifications .....................3
Server controls, LEDs, and connectors ................5
Front view ..........................5
Rear view ..........................6
Internal LEDs, connectors, and jumpers ................7
System-board internal and option connectors .............7
Operator information panel controls and internal connectors ........8
System-board switches and jumpers ................9
System-board external connectors .................11
System-board LEDs ......................12
Chapter 2. Configuration information and instructions .........15
Updating the firmware ......................15
Configuring the server ......................15
Using the Configuration/Setup Utility program ............15
Configuring the Ethernet controller.................16
Updating the BMC firmware ...................16
Updating the UUID .......................17
Updating the DMI/SMBIOS data ..................17
Chapter 3. Parts listing, Type 7940 and 7941 servers..........19
Replaceable server components ..................21
Product recovery CDs ......................23
Power cords ..........................25
Chapter 4. Removing and replacing server components ........29
Installation guidelines ......................29
System reliability guidelines ...................30
Handling static-sensitive devices .................30
Returning a device or component .................30
Removing and replacing Tier 1 CRUs ................31
Removing the cover ......................31
Installing the cover ......................31
Removing an air baffle .....................32
Installing an air baffle .....................33
Removing a riser-card assembly .................33
Installing a riser-card assembly ..................34
Removing an adapter .....................35
Installing an adapter ......................36
Removing the CD or DVD drive ..................36
Installing the CD or DVD drive ..................38
Removing a memory module (DIMM)................39
Installing a memory module ...................40
Removing a fan .......................42
© Copyright IBM Corp. 2007 iii
Installing a fan ........................43
Removing the system-board battery ................43
Installing the system-board battery.................44
Removing the power supply ...................46
Installing the power supply ...................48
Removing and replacing Tier 2 CRUs ................49
Removing the operator information panel ..............49
Installing the operator information panel ...............50
Removing the CD or DVD backplane ................51
Installing the CD or DVD backplane ................52
Removing the front hard disk drive cage assembly ...........53
Installing the front hard disk drive cage assembly ...........54
Removing the rear hard disk drive cage assembly ...........55
Installing the rear hard disk drive cage assembly ...........56
Removing the front hard disk drive ................56
Installing the front hard disk drive .................57
Removing the rear hard disk drive .................58
Installing the rear hard disk drive .................59
Removing and replacing FRUs ...................61
Removing a microprocessor ...................61
Installing a microprocessor ...................62
Removing the system board ...................64
Installing the system board ...................65
Chapter 5. Diagnostics .....................67
Diagnostic tools ........................67
POST ............................67
POST beep codes ......................67
Error logs ..........................76
POST error codes.......................77
Checkout procedure .......................83
About the checkout procedure ..................83
Performing the checkout procedure ................84
Troubleshooting tables ......................86
CD or DVD drive problems ...................86
General problems .......................87
Hard disk drive problems ....................88
Intermittent problems......................88
USB keyboard, mouse, or pointing-device problems ..........89
Memory problems .......................90
Microprocessor problems ....................91
Monitor or video problems ....................92
Optional-device problems ....................94
Power problems .......................95
Serial port problems ......................96
ServerGuide problems .....................96
Software problems ......................97
Universal Serial Bus (USB) device problems .............97
System board error LEDs and the light path button ...........98
Light path button .......................99
Power-supply LEDs .......................99
Diagnostic programs, messages, and error codes ...........101
Running the diagnostic programs.................101
Diagnostic text messages ...................102
Viewing the test log ......................102
Diagnostic error codes ....................103
iv IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
Recovering from a BIOS update failure (Clearing CMOS) .........107
BMC system-event log messages .................109
IPMI BMC system-event log messages ..............110
BIOS-logged BMC system-event log messages ...........115
Resetting passwords ......................117
Solving power problems .....................119
Solving Ethernet controller problems ................119
Video adapter information ....................120
Solving undetermined problems ..................121
Problem determination tips ....................121
Calling IBM for service .....................122
Appendix A. Getting help and technical assistance ..........125
Before you call ........................125
Using the documentation .....................125
Getting help and information from the World Wide Web .........126
Software service and support ...................126
Hardware service and support ...................126
Appendix B. Notices ......................127
Trademarks..........................127
Important notes ........................128
Product recycling and disposal ..................129
Battery return program .....................130
Electronic emission notices ....................131
Federal Communications Commission (FCC) statement ........131
Industry Canada Class A emission compliance statement ........132
Australia and New Zealand Class A statement ............132
United Kingdom telecommunications safety requirement ........132
European Union EMC Directive conformance statement ........132
Taiwanese Class A warning statement ...............133
Chinese Class A warning statement ................133
Japanese Voluntary Control Council for Interference (VCCI) statement 133
Index ............................135
Contents v
vi IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
Safety
Before installing this product, read the Safety Information.
Antes de instalar este produto, leia as Informações de Segurança.
Pred instalací tohoto produktu si prectete prírucku bezpecnostních instrukcí.
Læs sikkerhedsforskrifterne, før du installerer dette produkt.
Lees voordat u dit product installeert eerst de veiligheidsvoorschriften.
Ennen kuin asennat tämän tuotteen, lue turvaohjeet kohdasta Safety Information.
Avant d’installer ce produit, lisez les consignes de sécurité.
Vor der Installation dieses Produkts die Sicherheitshinweise lesen.
Prima di installare questo prodotto, leggere le Informazioni sulla Sicurezza.
Les sikkerhetsinformasjonen (Safety Information) før du installerer dette produktet.
Antes de instalar este produto, leia as Informações sobre Segurança.
Antes de instalar este producto, lea la información de seguridad.
Läs säkerhetsinformationen innan du installerar den här produkten.
© Copyright IBM Corp. 2007 vii
Guidelines for trained service technicians
This section contains information for trained service technicians.
Inspecting for unsafe conditions
Use the information in this section to help you identify potential unsafe conditions in
an IBM product that you are working on. Each IBM product, as it was designed and
manufactured, has required safety items to protect users and service technicians
from injury. The information in this section addresses only those items. Use good
judgment to identify potential unsafe conditions that might be caused by non-IBM
alterations or attachment of non-IBM features or optional devices that are not
addressed in this section. If you identify an unsafe condition, you must determine
how serious the hazard is and whether you must correct the problem before you
work on the product.
Consider the following conditions and the safety hazards that they present:
v Electrical hazards, especially primary power. Primary voltage on the frame can
cause serious or fatal electrical shock.
v Explosive hazards, such as a damaged CRT face or a bulging capacitor.
v Mechanical hazards, such as loose or missing hardware.
To inspect the product for potential unsafe conditions, complete the following steps:
1. Make sure that the power is off and the power cord is disconnected.
2. Make sure that the exterior cover is not damaged, loose, or broken, and
observe any sharp edges.
3. Check the power cord:
v Make sure that the third-wire ground connector is in good condition. Use a
meter to measure third-wire ground continuity for 0.1 ohm or less between
the external ground pin and the frame ground.
v Make sure that the power cord is the correct type, as specified in “Power
cords” on page 25.
v Make sure that the insulation is not frayed or worn.
4. Remove the cover.
5. Check for any obvious non-IBM alterations. Use good judgment as to the safety
of any non-IBM alterations.
6. Check inside the server for any obvious unsafe conditions, such as metal filings,
contamination, water or other liquid, or signs of fire or smoke damage.
7. Check for worn, frayed, or pinched cables.
8. Make sure that the power-supply cover fasteners (screws or rivets) have not
been removed or tampered with.
Guidelines for servicing electrical equipment
Observe the following guidelines when you service electrical equipment:
v Check the area for electrical hazards such as moist floors, nongrounded power
extension cords, power surges, and missing safety grounds.
v Use only approved tools and test equipment. Some hand tools have handles that
are covered with a soft material that does not provide insulation from live
electrical currents.
v Regularly inspect and maintain your electrical hand tools for safe operational
condition. Do not use worn or broken tools or testers.
viii IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
v Do not touch the reflective surface of a dental mirror to a live electrical circuit.
The surface is conductive and can cause personal injury or equipment damage if
it touches a live electrical circuit.
v Some rubber floor mats contain small conductive fibers to decrease electrostatic
discharge. Do not use this type of mat to protect yourself from electrical shock.
v Do not work alone under hazardous conditions or near equipment that has
hazardous voltages.
v Locate the emergency power-off (EPO) switch, disconnecting switch, or electrical
outlet so that you can turn off the power quickly in the event of an electrical
accident.
v Disconnect all power before you perform a mechanical inspection, work near
power supplies, or remove or install main units.
v Before you work on the equipment, disconnect the power cord. If you cannot
disconnect the power cord, have the customer power-off the wall box that
supplies power to the equipment and lock the wall box in the off position.
v Never assume that power has been disconnected from a circuit. Check it to
make sure that it has been disconnected.
v If you have to work on equipment that has exposed electrical circuits, observe
the following precautions:
– Make sure that another person who is familiar with the power-off controls is
near you and is available to turn off the power if necessary.
– When you work with powered-on electrical equipment, use only one hand.
Keep the other hand in your pocket or behind your back to avoid creating a
complete circuit that could cause an electrical shock.
– When you use a tester, set the controls correctly and use the approved probe
leads and accessories for that tester.
– Stand on a suitable rubber mat to insulate you from grounds such as metal
floor strips and equipment frames.
v Use extreme care when you measure high voltages.
v To ensure proper grounding of components such as power supplies, pumps,
blowers, fans, and motor generators, do not service these components outside of
their normal operating locations.
v If an electrical accident occurs, use caution, turn off the power, and send another
person to get medical aid.
Safety ix
Safety statements
Important:
Each caution and danger statement in this documentation begins with a number.
This number is used to cross reference an English-language caution or danger
statement with translated versions of the caution or danger statement in the Safety
Information document.
For example, if a caution statement begins with a number 1, translations for that
caution statement appear in the Safety Information document under statement 1.
Be sure to read all caution and danger statements in this documentation before
performing the instructions. Read any additional safety information that comes with
your server or optional device before you install the device.
x IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
Statement 1:
DANGER
Electrical current from power, telephone, and communication cables is
hazardous.
To avoid a shock hazard:
v Do not connect or disconnect any cables or perform installation,
maintenance, or reconfiguration of this product during an electrical
storm.
v Connect all power cords to a properly wired and grounded electrical
outlet.
v Connect to properly wired outlets any equipment that will be attached to
this product.
v When possible, use one hand only to connect or disconnect signal
cables.
v Never turn on any equipment when there is evidence of fire, water, or
structural damage.
v Disconnect the attached power cords, telecommunications systems,
networks, and modems before you open the device covers, unless
instructed otherwise in the installation and configuration procedures.
v Connect and disconnect cables as described in the following table when
installing, moving, or opening covers on this product or attached
devices.
To Connect: To Disconnect:
1. Turn everything OFF.
2. First, attach all cables to devices.
3. Attach signal cables to connectors.
4. Attach power cords to outlet.
5. Turn device ON.
1. Turn everything OFF.
2. First, remove power cords from outlet.
3. Remove signal cables from connectors.
4. Remove all cables from devices.
Safety xi
Statement 2:
CAUTION:
When replacing the lithium battery, use only IBM Part Number 33F8354 or an
equivalent type battery recommended by the manufacturer. If your system has
a module containing a lithium battery, replace it only with the same module
type made by the same manufacturer. The battery contains lithium and can
explode if not properly used, handled, or disposed of.
Do not:
v Throw or immerse into water
v Heat to more than 100°C (212°F)
v Repair or disassemble
Dispose of the battery as required by local ordinances or regulations.
xii IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
Statement 3:
CAUTION:
When laser products (such as CD-ROMs, DVD drives, fiber optic devices, or
transmitters) are installed, note the following:
v Do not remove the covers. Removing the covers of the laser product could
result in exposure to hazardous laser radiation. There are no serviceable
parts inside the device.
v Use of controls or adjustments or performance of procedures other than
those specified herein might result in hazardous radiation exposure.
DANGER
Some laser products contain an embedded Class 3A or Class 3B laser
diode. Note the following.
Laser radiation when open. Do not stare into the beam, do not view directly
with optical instruments, and avoid direct exposure to the beam.
Class 1 Laser Product
Laser Klasse 1
Laser Klass 1
Luokan 1 Laserlaite
Appareil A Laser de Classe 1
`
Safety xiii
Statement 4:
≥ 18 kg (39.7 lb) ≥ 32 kg (70.5 lb) ≥ 55 kg (121.2 lb)
CAUTION:
Use safe practices when lifting.
Statement 5:
CAUTION:
The power control button on the device and the power switch on the power
supply do not turn off the electrical current supplied to the device. The device
also might have more than one power cord. To remove all electrical current
from the device, ensure that all power cords are disconnected from the power
source.
2
1
xiv IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
Statement 8:
CAUTION:
Never remove the cover on a power supply or any part that has the following
label attached.
Hazardous voltage, current, and energy levels are present inside any
component that has this label attached. There are no serviceable parts inside
these components. If you suspect a problem with one of these parts, contact
a service technician.
Statement 26:
CAUTION:
Do not place any object on top of rack-mounted devices.
Attention: This server is suitable for use on an IT power distribution system,
whose maximum phase to phase voltage is 240 V under any distribution fault
condition.
Safety xv
xvi IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
Chapter 1. Introduction
This Problem Determination and Service Guide contains information to help you
solve problems that might occur in your IBM
server. It describes the diagnostic tools that come with the server, error codes and
suggested actions, and instructions for replacing failing components.
Technical updates might be available to provide additional information that is not
included in the server documentation. To check for updates, go to
http://www.ibm.com/servers/eserver/support/xseries/index.html, select System
x3455 from the Hardware list, and click Go. For firmware updates, click the
Download tab. For documentation updates, click the Install and use tab, and click
Product documentation.
Replaceable components are of three types:
v Tier 1 customer replaceable unit (CRU): Replacement of Tier 1 CRUs is your
responsibility. If IBM installs a Tier 1 CRU at your request, you will be charged for
the installation.
v Tier 2 customer replaceable unit: You may install a Tier 2 CRU yourself or
request IBM to install it, at no additional charge, under the type of warranty
service that is designated for your server.
v Field replaceable unit (FRU): FRUs must be installed only by trained service
technicians.
For information about the terms of the warranty and getting service and assistance,
see the Warranty and Support Information document.
®
System x3455 Type 7940 or 7941
Related documentation
In addition to this document, the following documentation also comes with the
server:
v Installation Guide
This printed document contains instructions for setting up the server and basic
instructions for installing some optional devices.
v User’s Guide
This document is in Portable Document Format (PDF) on the IBM System x
Documentation CD. It provides general information about the server, including
information about features, and how to configure the server. It also contains
detailed instructions for installing, removing, and connecting optional devices that
the server supports.
v Rack Installation Instructions
This printed document contains instructions for installing the server in a rack.
v Safety Information
This document is in PDF on the IBM System x Documentation CD. It contains
translated caution and danger statements. Each caution and danger statement
that appears in the documentation has a number that you can use to locate the
corresponding statement in your language in the Safety Information document.
v Warranty and Support Information
This document is in PDF on the IBM System x Documentation CD. It contains
information about the terms of the warranty and getting service and assistance.
© Copyright IBM Corp. 2007 1
Depending on the server model, additional documentation might be included on the
IBM System x Documentation CD.
The System x and xSeries Tools Center is an online information center that
contains information about tools for updating, managing, and deploying firmware,
device drivers, and operating systems. The System x and xSeries Tools Center is at
http://publib.boulder.ibm.com/infocenter/toolsctr/v1r0/index.jsp.
The server might have features that are not described in the documentation that
comes with the server. The documentation might be updated occasionally to include
information about those features, or technical updates might be available to provide
additional information that is not included in the server documentation. These
updates are available from the IBM Web site. To check for updated documentation
and technical updates, complete the following steps.
Note: Changes are made periodically to the IBM Web site. The actual procedure
might vary slightly from what is described in this document.
1. Go to http://www.ibm.com/servers/eserver/support/xseries/index.html
2. From the Hardware list, select System x3455 and click Go.
3. Click the Install and use tab.
4. Click Product documentation.
Notices and statements in this document
The caution and danger statements that appear in this document are also in the
multilingual Safety Information document, which is on the IBM System x
Documentation CD. Each statement is numbered for reference to the corresponding
statement in the Safety Information document.
The following notices and statements are used in this document:
v Note: These notices provide important tips, guidance, or advice.
v Important: These notices provide information or advice that might help you avoid
inconvenient or problem situations.
v Attention: These notices indicate potential damage to programs, devices, or
data. An attention notice is placed just before the instruction or situation in which
damage could occur.
v Caution: These statements indicate situations that can be potentially hazardous
to you. A caution statement is placed just before the description of a potentially
hazardous procedure step or situation.
v Danger: These statements indicate situations that can be potentially lethal or
extremely hazardous to you. A danger statement is placed just before the
description of a potentially lethal or extremely hazardous procedure step or
situation.
2 IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
Features and specifications
The following information is a summary of the features and specifications of the
server. Depending on the server model, some features might not be available, or
some specifications might not apply.
Table 1. Features and specifications
Microprocessors:
Important: Dual-core and quad-core
microprocessors are not
interchangeable and cannot be used
in the same server.
v Up to two AMD Opteron
™
dual-core with 1 MB Level-2
cache or quad-core with 2 MB
Level-2 cache.
Note: Use the Configuration/Setup
Utility program to determine the
speed of the microprocessors.
Memory:
v Minimum: 1024 MB
v Maximum: 48 GB
v Type: PC2-5300 error-correcting
code (ECC), double-data-rate 2
(DDR2) SDRAM, registered
DIMMs with Chipkill
™
memory
protection
v Sizes: 512 MB, 1 GB, 2 GB, or 4
GB DIMMs in pairs
Note: Chipkill memory protection
is not supported on 512 MB
DIMMs.
v Six interleaved slots with
standard microprocessor
v Six additional interleaved slots
with optional microprocessor
v Standard: One pair of matching
DIMMs
Drives:
v CD-RW/DVD: Ultrabay Enhanced
IDE (standard only on some
models)
v Non-hot-swap hard disk drives:
– One standard
– Slim-high 3.5-inch drives
– Serial Advanced Technology
– Serial Attached SCSI (SAS)
– Maximum: Two SATA or two
Expansion slots:
v Two, used in either of the following
configurations:
– One full-height, half-length
– One full-height, half-length PCI
v Each riser card supports one
adapter
v Server supports a maximum of two
adapters
Attachment (SATA)
Note: Drive capacity and
speed vary with model.
drives are supported if an
optional SAS adapter is
installed.
SAS drives
Hyper Transport (HTX) riser
card and one half-length PCI
Express x16 riser card
Express x8 and one half-length
PCI Express x16 riser card
Video controller:
v ATI RN50b video controller on
system board
v Compatible with SVGA
v 16 MB DDR1 video memory
Power supply:
One 650 watt (115 - 230 V ac)
Cooling:
v Three nonredundant,
non-hot-swappable fans with
system-board connectors
v Two air baffles on the system board
v Two fans built into the power supply
Size:
v Height: 43 mm (1.7 in.)
v Depth:
– 660.5 mm (26.0 in.) with bezel
– 643.5 mm (25.3 in.) without bezel
v Width: 440 mm (17.3 in.)
v Weight: approximately 11.9 kg (26.2
lb) when fully configured
Integrated functions:
v Baseboard management controller
v One SATA controller
v Two Broadcom 10/100/1000 Ethernet
controllers (dual-port design) with
Wake on LAN
®
support
v Six Universal Serial Bus (USB) ports
– Two on front of server
– Four on rear of server
v One serial port
v One video port
Chapter 1. Introduction 3
Table 1. Features and specifications (continued)
Acoustical noise emissions:
v Declared sound power, idling: 6.5
bels
v Declared sound power, operating:
6.5 bels
Environment:
v Air temperature:
– Server on: 10° to 35°C (50.0°
to 95.0°F). Altitude: 0 to 914 m
(2998.7 ft)
– Server on: 10° to 32°C (50.0°
to 89.6°F). Altitude: 914 m
(2998.7 ft) to 2133 m (6998.0
ft)
– Server off: 10° to 43°C (50.0°
to 109.4°F). Maximum altitude:
2133 m (6998.0 ft)
v Humidity:
– Server on: 8% to 80%
– Server off: 8% to 80%
v Airflow rates:
– Minimum: 34 CFM
– Maximum: 74 CFM
Heat output:
Approximate heat output in British
thermal units (Btu) per hour for dual
multiprocessor configurations:
v Minimum configuration: 430 Btu
(126 watts)
v Maximum configuration: 1707 Btu
(500 watts)
Electrical input:
v Sine-wave input (50-60 Hz)
required
v Input voltage low range:
– Minimum: 100 V ac
– Maximum: 127 V ac
v Input voltage high range:
– Minimum: 200 V ac
– Maximum: 240 V ac
v Input kilovolt-amperes (kVA),
approximately:
– Minimum: 0.126 kVA
– Maximum: 0.500 kVA
Notes:
1. Power consumption and heat output
vary depending on the number and
type of optional features installed
and the power-management
optional features in use.
2. These levels were measured in
controlled acoustical environments
according to the procedures
specified by the American National
Standards Institute (ANSI) S12.10
and ISO 7779 and are reported in
accordance with ISO 9296. Actual
sound-pressure levels in a given
location might exceed the average
values stated because of room
reflections and other nearby noise
sources. The declared sound-power
levels indicate an upper limit, below
which a large number of computers
will operate.
4 IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
Server controls, LEDs, and connectors
This section describes the controls, light-emitting diodes (LEDs), and connectors on
the front and rear of the server.
Front view
The following illustration shows the controls, LEDs, and connectors on the front of
the server. Except for the CD or DVD drive activity LED, the CD-eject or DVD-eject
button, and the rack release latches, these controls, LEDs, and connectors are on
the operator information panel.
Hard disk drive activity LED
Power-on LED
Reset button
Power-control button
System locator LED
System-error LED
USB port connectors (2)
Rack release latchRack release latch
CD-eject or DVD-eject button
CD or DVD drive activity LED
CD or DVD drive activity LED: When this LED is lit, it indicates that the CD drive
or DVD drive is in use.
CD-eject or DVD-eject button: Press this button to release a CD from the CD
drive or a DVD from the DVD drive.
Rack release latches: Each side of the front of the server has a rack release latch.
Press these latches to remove the server from the rack.
Operator information panel: This panel contains controls, LEDs, and connectors.
The following illustration shows the operator information panel.
Hard disk drive activity LED (green)
Power-on LED (green)
Reset button
Power-control button
Power-control button shield
Locator LED (blue)
System-error LED (amber)
USB connectors (2)
The following controls, LEDs, and connectors are on the operator information panel:
v Power-control button: Press this button to turn the server on and off manually.
You might have to use a pen or the end of a straightened paper clip to press the
button.
A power-control-button shield comes with the server. You can install it to prevent
the server from being turned off accidentally.
Chapter 1. Introduction 5
v Reset button: Press this button to reset the server and run the power-on
self-test (POST). You might have to use a pen or the end of a straightened paper
clip to press the button.
v Power-on LED: When this LED is lit and not flashing, it indicates that the server
is turned on. When this LED is flashing, it indicates that the server is turned off
and still connected to an ac power source. When this LED is off, it indicates that
ac power is not present, or the power supply or the LED itself has failed.
Notes:
1. If this LED is off, it does not mean that there is no electrical power in the
server. The LED might be burned out. To remove all electrical power from the
server, you must disconnect the power cord from the electrical outlet.
2. The ac power and dc power LEDs are on the power supply and can be
viewed from the rear of the server. For additional information, see “Rear
view.”
v Hard disk drive activity LED: When this LED is lit, it indicates that either of the
hard disk drives is in use.
v System locator LED: This LED can be lit remotely by the system administrator
to aid in visually locating the server. If the server supports IBM Director, you can
use IBM Director to light this LED remotely. A system locator LED is also on the
rear of the server.
v System-error LED (!): When this LED is lit, it indicates that a system error has
occurred. An LED near the failing component on the system board is also lit to
help isolate the error.
v USB connectors: Connect a USB device to either of these connectors.
Rear view
Notes:
1. If you want to attach a keyboard or mouse to this server, you must use a USB
keyboard or a USB mouse. For detailed information about the USB keyboard
and how to connect it to your server, see the documentation that comes with the
USB keyboard.
2. The server supports keyboardless operation. If a USB keyboard is not
connected to the server, when the server is turned on or restarted, error
message 301 will be displayed during POST. No action is required. POST will
continue within 1 minute.
3. If you want to attach a diskette drive to this server, you must use an external
USB diskette drive.
The following illustration shows the connectors, switches, and LEDs on the rear of
the server.
Link LED
LAN activity LED
Video
connector
NMI switch
Ethernet
connectors
(2)
USB connectors (4)
Power-cord
connector
AC power LED
DC power LED
Serial connector
System locator LED
6 IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
Link LEDs (Ethernet): These LEDs are on the dual Ethernet connector. When
either LED is lit, it indicates that there is an active link between the server and the
network device that is connected to the left or right connector.
Video connector: Connect a monitor to this connector.
NMI switch: This switch is reserved for use by service technicians only.
Power-cord connector: Connect the power cord to this connector.
AC power LED: The power supply has an ac power LED and a dc power LED.
When the ac power LED is lit, it indicates that sufficient power is coming into the
power supply through the power cord. During typical operation, both the ac and dc
power LEDs are lit. For additional information about the ac power and dc power
LEDs, see “Power-supply LEDs” on page 99.
DC power LED: The power supply has a dc power LED and an ac power LED.
When the dc power LED is lit, it indicates that the power supply is supplying
adequate dc power to the system. During typical operation, both the ac and dc
power LEDs are lit. For additional information about the ac power and dc power
LEDs, see “Power-supply LEDs” on page 99.
Serial connector: Connect a 9-pin serial device to this connector.
System locator LED: This LED can be lit remotely by the system administrator to
aid in visually locating the server. If the server supports IBM Director, you can use
IBM Director to light this LED remotely. A system locator LED is also on the front of
the server.
USB connectors: Connect a USB device to any of these four connectors.
Gigabit Ethernet 1 (LAN 1) connector: Use this connector to connect the server
to a network.
Gigabit Ethernet 2 (LAN 2) connector: Use this connector to connect the server
to a network.
LAN activity LEDs (Ethernet): These green LEDs are on the dual Ethernet
connector. When either LED flashes, it indicates that data is being transmitted or
received between the server and the local area network (LAN) device that is
connected to the left or right connector. The flashing frequency is proportional to the
amount of traffic on the network link.
Internal LEDs, connectors, and jumpers
The illustrations in this section show the connectors, LEDs, and jumpers on the
internal boards. The illustrations might differ slightly from your hardware.
System-board internal and option connectors
The following illustration shows the connectors for internal and user-installable
optional devices.
Chapter 1. Introduction 7
PCI Express x16 riser card
Operator information panel
USB (2) (front)
SATA hard disk
drive 2
SATA hard disk
drive 1
CD or DVD drive
Battery
PCI Express x8
riser card
HTX riser card
Powe r
Fan 1 Fan 2
Operator information panel controls and internal connectors
The following illustration shows the controls and internal connectors on the operator
information panel. When the server is turned off, you can light the system-board
error LEDs for up to 30 seconds to indicate detected faults by pressing the light
path button.
Signal cable connector
Light-path button
USB cable connector
Fan 3
8 IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
System-board switches and jumpers
The following illustration shows the switches and jumpers on the system board.
Boot block recovery
jumper (J51)
NMI switch (SW1)
Power-on password
jumper (J52)
Force power-on
jumper (J37)
BMC update
jumper (J34)
Wake on LAN
bypass jumper (J48)
BMC reset
jumper (J36)
Chapter 1. Introduction 9
Table 2. Switch and jumper settings
Default
Component
NMI (nonmaskable
interrupt) switch (SW1)
Boot block recovery
jumper (J51)
BMC reset jumper (J36) Off Force BMC reset (trained service technician only).
Wake on LAN bypass
jumper (J48)
BMC update jumper
(J34)
Force power-on jumper
(J37)
Power-on password
override jumper (J52)
value Settings
Off Pressing this button issues an NMI.
1 and 2
1 and 2
Off Force BMC update (trained service technician
Off Power-on override. When installed, this jumper
1 and 2 Power-on (user) password override. Changing the
v Pins 1 and 2: Normal (default)
v Pins 2 and 3: Recover boot block.
When this jumper is installed, it causes a
continuous reset of the BMC.
v Pins 1 and 2: Wake on LAN disabled.
v Pins 2 and 3: Wake on LAN enabled
only). When this jumper is installed, it causes an
update of BMC firmware from ROM.
forces the server power on, overriding the
power-on button.
position of this jumper bypasses the power-on
password check the next time the server is turned
on and starts the Configuration/Setup Utility
program (see “Using the Configuration/Setup Utility
program” on page 15) so that you can change or
delete the power-on password. Move the jumper
back to the default position after the password is
overridden.
Changing the position of this jumper does not
bypass the administrator password check if an
administrator password is set.
10 IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
System-board external connectors
The following illustration shows the external connectors on the system board.
Serial
USB (4)
Video
Ethernet 2
Ethernet 1
Chapter 1. Introduction 11
System-board LEDs
The following illustration shows the light-emitting diodes (LEDs) on the system
board.
DIMM 7 error LED
DIMM 8 error LED
DIMM 9 error LED
DIMM 10 error LED
DIMM 11 error LED
DIMM 12 error LED
BMC heartbeat
LED
Battery error LED
Slot 1 error LED
Light-path power LED
Microprocessor 2
error LED
Microprocessor 2
VRD error LED
Fan 1 error LED
DIMM 1 error LED
DIMM 2 error LED
DIMM 3 error LED
DIMM 4 error LED
DIMM 5 error LED
DIMM 6 error LED
Slot 2 error LED
Microprocessor 1
error LED
Microprocessor 1
VRD error LED
Fan 3 error LED
Fan 2 error LED
12 IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
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