Lenovo ThinkCentre M725s Owner's manual

M725s User Guide and Hardware
Maintenance Manual
Energy Star Machine Types: 10VT, 10VU, 10VV, and 10VX

Note: Before using this infor ation and the product it supports, be sure to read and understand the
Important Product Information Guide and Appendix A “Notices” on page 63.
First Edition (July 2018)
Copyright Lenovo 2018.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services
Ad inistration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-
35F-05925.

Contents
Chapter 1. Overview . . . . . . . . . . . 1
Front view . . . . . . . . . . . . . . . . . . 1
Rear view . . . . . . . . . . . . . . . . . . 3
Syste board . . . . . . . . . . . . . . . . 5
Machine type and odel label . . . . . . . . . . 6
Chapter 2. Specifications . . . . . . . . 7
Chapter 3. Computer locks . . . . . . . 9
Chapter 4. Replacing hardware . . . . 11
Before replacing hardware . . . . . . . . . . 11
Knowing FRUs (including CRUs) . . . . . . . . 11
Locating FRUs (including CRUs) . . . . . . . . 12
Replacing external options . . . . . . . . . . 14
Re oving the co puter cover . . . . . . . . . 16
Replacing the front bezel . . . . . . . . . . . 17
Replacing the optical drive . . . . . . . . . . 18
Pivoting the drive bay asse bly upward and
downward . . . . . . . . . . . . . . . . . 20
Replacing the storage drive . . . . . . . . . . 22
Replacing the power button board and the card
reader . . . . . . . . . . . . . . . . . . 27
Replacing the illu inated red dot . . . . . . . . 31
Replacing the internal speaker . . . . . . . . . 33
Replacing the ther al sensor . . . . . . . . . 35
Replacing the Wi-Fi card . . . . . . . . . . . 38
Replacing the Wi-Fi antennas . . . . . . . . . 40
Replacing the M.2 solid-state drive . . . . . . . 42
Replacing the M.2 solid-state drive bracket . . . . 45
Replacing the coin-cell battery . . . . . . . . . 46
Replacing a e ory odule. . . . . . . . . . 48
Replacing the heat sink and fan asse bly . . . . 50
Replacing the icroprocessor . . . . . . . . . 52
Replacing a PCI Express card . . . . . . . . . 54
Replacing the cover presence switch . . . . . . 56
Replacing the power supply asse bly . . . . . . 57
Replacing the syste board . . . . . . . . . . 59
Co pleting the parts replace ent . . . . . . . 60
Appendix A. Notices . . . . . . . . . . 63
Appendix B. Trademarks . . . . . . . 65
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ii M725s User Guide and Hardware Maintenance Manual

Chapter 1. Overview
This chapter provides basic infor ation to help you get fa iliar with your co puter.
Front view
Note: Your co puter odel ight look slightly different fro the illustration.
Figure 1. Front view
1 Optical drive eject button 2 Optical drive activity indicator
3 Storage drive activity indicator 4 Card reader slot (optional)
5 Power button 6 Power indicator
7 Microphone connector 8 Headphone connector
9 USB 3.1 Gen 2 connectors (2) 10 USB 3.1 Gen 1 connectors (2)
11 Illu inated red dot 12 Internal speaker (optional)
1 Optical drive eject button
Used to eject the tray of the optical drive.
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2 Optical drive activity indicator
This indicator is on when the optical drive is in use.
3 Storage drive activity indicator
This indicator is on when the storage drive is in use.
4 Card reader slot
Used to read data fro a supported e ory card.
5 Power button
Used to turn on your co puter. When you cannot shut down the co puter fro the operating syste , press
and hold the power button for four or ore seconds to turn off the co puter.
6 Power indicator
This indicator is on when the co puter is on.
7 Microphone connector
Used to connect a icrophone to your co puter when you want to record sound or interact with the
co puter using speech recognition software.
8 Headphone connector
Used to connect headphones to your co puter.
9 USB 3.1 Gen 2 connector
Used to connect a USB-co patible device. For opti al data transfer, connect a USB 3.1 Gen 2 device to a
USB 3.1 Gen 2 connector instead of a USB 3.1 Gen 1 or USB 2.0 connector.
10 USB 3.1 Gen 1 connector
Used to connect a USB-co patible device. For opti al data transfer, connect a USB 3.1 Gen 1 device to a
USB 3.1 Gen 2 or USB 3.1 Gen 1 connector instead of a USB 2.0 connector.
11 Illuminated red dot
This indicator is on when the co puter is on.
12 Internal speaker
Used to listen to the sounds fro your co puter without using a headset or headphones.
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Rear view
Note: Your co puter odel ight look slightly different fro the illustration.
Figure 2. Rear view
1 Microphone connector 2 VGA-out connector
3 DisplayPort® 1.2 out connectors (2) 4 USB 3.1 Gen 1 connectors (2)
5 USB 2.0 connectors (2) 6 PS/2 keyboard connector
7 Audio line-out connector 8 Audio line-in connector
9 Serial connector 10 Ethernet connector
11 PS/2 ouse connector 12 Security-lock slot
13 Padlock loop 14 PCI-Express card area
15 S art cable clip slots (2) (optional) 16 Power cord connector
1 Microphone connector
Used to connect a icrophone to your co puter when you want to record sound or interact with the
co puter using speech recognition software.
2 VGA-out connector
Chapter 1.Overview 3

Used to send video signals fro the co puter to another video device, such as a onitor.
3 DisplayPort 1.2 out connector
Used to send audio and video signals fro the co puter to another audio or video device, such as a high-
perfor ance onitor.
4 USB 3.1 Gen 1 connector
Used to connect a USB-co patible device. For opti al data transfer, connect a USB 3.1 Gen 1 device to a
USB 3.1 Gen 2 or USB 3.1 Gen 1 connector instead of a USB 2.0 connector.
5 USB 2.0 connector
Used to connect a device that requires a USB 2.0 connection.
6 PS/2 keyboard connector
Used to connect a keyboard that uses a Personal Syste /2 (PS/2) keyboard connector.
7 Audio line-out connector
Used to send audio signals fro the co puter to external devices, such as powered stereo speakers,
headphones, or ulti edia keyboards. To connect a stereo syste or other external recording device,
connect a cable between the audio line-in connector of the device and the audio line-out connector of the
co puter.
Note: If your co puter has both an audio line-out connector and a headset or headphone connector, always
use the headset or headphone connector for earphones, headphones, or a headset. The headphone
connector does not support headset icrophones.
8 Audio line-in connector
Used to receive audio signals fro an external audio device, such as a stereo syste . To connect an external
audio device, connect a cable between the audio line-out connector of the device and the audio line-in
connector of the co puter.
9 Serial connector
Used to connect an external ode , a serial printer, or other devices that use a serial connector.
10 Ethernet connector
Used to connect an Ethernet cable for network access.
11 PS/2 mouse connector
Used to connect a ouse, a trackball, or other pointing devices that use a PS/2 ouse connector.
12 Security-lock slot
Used to secure a Kensington-style cable lock.
13 Padlock loop
Used to secure a padlock.
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14 PCI-Express card area
To i prove the operating perfor ance of the co puter, you can connect PCI-Express cards into this area.
Depending on the co puter odel, the connectors in this area vary.
15 Smart cable clip slots
Used to secure a s art cable clip.
16 Power cord connector
Used to connect the power cord to your co puter for power supply.
System board
Note: See “Front view” and “Rear view” for additional co ponent descriptions.
Figure 3. System board
1 4-pin power connector 2 Microprocessor fan connector
3 Internal speaker connector 4 Storage drive activity indicator
5 Power button board connector 6 SATA power connectors (2)
7 10-pin power connector 8 Clear CMOS /Recovery ju per
9 SATA 3.0 connectors (3) 10 Auxiliary fan connector 1
11 Illu inated red dot connector 12 Ther al sensor connector
13 M.2 solid-state drive slot 14 Front USB 2.0 connector (card reader connector)
15 Front USB 2.0 connector 16 Parallel connector
Chapter 1.Overview 5

17 Serial (COM2) connector 18 Buzzer
19 PCI Express x1 card slots (2) 20 PCI Express x16 graphics card slot
21 Syste fan connector 22 Microprocessor socket
23 Me ory slot (DIMM1) 24 Me ory slot (DIMM2)
25 Me ory slot (DIMM3) 26 Me ory slot (DIMM4)
27 Coin-cell battery 28 PCH
29 M.2 Wi-Fi card slot 30 Cover presence switch connector (intrusion switch
connector)
Machine type and model label
The achine type and odel label identifies the co puter. When you contact Lenovo for help, the achine
type and odel infor ation helps support technicians to identify the co puter and provide faster service.
The achine type and odel label is attached to the co puter as shown.
Figure 4. achine type and model label
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Chapter 2. Specifications
Power supply
• 180-watt auto atic voltage-sensing power supply
• 210-watt auto atic voltage-sensing power supply
Storage drives
• 3.5-inch storage drive (optional)
• 2.5-inch storage drive (optional)
• M.2 solid-state drive (optional)
Video features
• The integrated graphics card supports the following:
– DisplayPort 1.2 out connector
– VGA-out connector
• The optional discrete graphics card provides an enhanced video experience and extended capabilities.
Audio features
• The integrated audio card supports the following:
– Audio line-in connector
– Audio line-out connector
– Headphone connector
– Internal speaker (optional)
– Microphone connector
• The optional discrete audio card provides an enhanced audio experience and extended capabilities.
Input/Output (I/O) features
• Audio connectors (audio line-in, audio line-out, headphone, and icrophone)
• Card reader slot (optional)
• Display connectors (DisplayPort 1.2 out and VGA-out)
• Ethernet connector
• PS/2 keyboard connector
• PS/2 ouse connector
• Serial connector
• USB connectors
Expansion
• Card reader (optional)
• Me ory slots
• Optical drive
• PCI Express x1 card slot
• PCI Express x16 graphics card slot
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• Storage drive bay
Network features
• Ethernet LAN
• Wireless LAN (optional)
• Bluetooth (optional)
Physical dimensions
• Width: 92.5 (3.6 inches)
• Height: 343.5 (13.5 inches)
• Depth: 290.5 (11.4 inches)
Weight (without the package)
Maxi u configuration as shipped: 6.0 kg (13.2 lb)
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Chapter 3. Computer locks
Locking the computer cover
Locking the co puter cover helps prevent unauthorized access to the inside of your co puter. Your
co puter features a padlock loop so that the co puter cover cannot be re oved when a padlock is
installed.
Figure 5. Locking the computer cover
Attaching a Kensington-style cable lock
You can use a Kensington-style cable lock to secure your co puter to a desk, table, or another
nonper anent fixture. The cable lock connects to the security-lock slot at the rear of your co puter.
Depending on the type selected, the cable lock can be operated with a key or a co bination. The cable lock
also locks the buttons used to open the co puter cover. This is the sa e type of lock used with any
notebook co puters. You can order such a cable lock directly fro Lenovo by searching for Kensington at:
http://www.lenovo.co /support
Figure 6. Attaching a Kensington-style cable lock
© Copyright Lenovo 2018 9

Attaching a smart cable clip
A s art cable clip can be used to secure devices, such as the keyboard and the ouse, by locking the
device cables to the co puter. The s art cable clip connects to the cable-lock slots on the rear of the
co puter. To install a s art cable clip, do the following:
1. Insert the clip 1 into the cable-lock slot 4.
2. Pull the cables you want to lock through the dents in the s art cable clip.
3. Press the clip 2 into the cable-lock slot 3 until it snaps into position.
Figure 7. Attaching a smart cable clip
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Chapter 4. Replacing hardware
This chapter provides instructions on how to replace hardware for your co puter.
Before replacing hardware
Attention: Do not open your co puter or atte pt any repairs before reading this section and the Important
Product Information Guide.
Notes before replacing hardware
• Use co puter co ponents provided only by Lenovo.
• When installing or replacing an option, use the appropriate instructions explained in this anual along with
the instructions that co e with the option.
• In ost areas of the world, Lenovo requires the return of defective CRUs. Infor ation about this will co e
with the CRU or will co e a few days after the CRU arrives.
Notes when handling static-sensitive devices
Do not open the static-protective package containing the new part until the defective part has been re oved
and you are ready to install the new part. Static electricity, although har less to you, can seriously da age
co puter co ponents and options.
When you handle options and other co puter co ponents, take these precautions to avoid static-electricity
da age:
• Li it your ove ent. Move ent can cause static electricity to build up around you.
• Always handle options and other co puter co ponents carefully. Handle PCI/PCIe cards, e ory
odules, syste boards, and icroprocessors by the edges. Never touch any exposed circuitry.
• Prevent others fro touching the options and other co puter co ponents.
• Touch the static-protective package containing the part to a etal expansion-slot cover or other
unpainted etal surface on the co puter for at least two seconds. This reduces static electricity fro the
package and your body before you install or replace a new part.
• When possible, re ove the new part fro the static-protective package, and install it directly in the
co puter without setting the part down. When this is not possible, place the static-protective package on
a s ooth, level surface and place the part on the package.
• Do not place the part on the co puter cover or other etal surface.
Knowing FRUs (including CRUs)
• Field Replaceable Units (FRUs) are co puter parts that a trained technician can upgrade or replace. FRUs
include all CRUs. For detailed FRU infor ation, such as the FRU part nu bers and supported co puter
odels, go to:
http://www.lenovo.co /serviceparts-lookup
• Custo er Replaceable Units (CRUs) are co puter parts that a user can upgrade or replace.
– Self-service CRUs: You can install self-service CRUs easily. These CRUs ight be stand-alone,
latched, or secured by up to two screws. Exa ples of self-service CRUs include the keyboard, ouse,
and any USB device. You are responsible for replacing all self-service CRUs.
– Optional-service CRUs: Handling optional-service CRUs requires so e technical skills and si ple tools
(such as a screwdriver). These CRUs are isolated parts within the co puter. They are usually
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concealed by an access panel that is secured by ore than two screws. You ust re ove the screws
and panel to access the specific CRU. Optional-service CRUs can be re oved and installed by users
or, during the warranty period, by a Lenovo service technician.
Before replacing FRUs
Before replacing any FRU, read the following:
• Only certified and trained personnel can service the co puter.
• Before replacing an FRU, read the entire section about replacing the part.
• Be extre ely careful during writing operations such as copying, saving, or for atting.
The sequence of the drives in the co puter that you are servicing ight have been altered. If you select
an incorrect drive, data or progra s ight be overwritten.
• Replace an FRU only with another FRU of the correct odel.
When you replace an FRU, ensure that the odel of the achine and the FRU part nu ber are correct.
• An FRU should not be replaced because of a single, unreproducible failure.
Single failures can occur for a variety of reasons that have nothing to do with a hardware defect, such as
cos ic radiation, electrostatic discharge, or software errors. Consider replacing an FRU only when a
proble recurs. If you suspect that an FRU is defective, clear the error log and run the test again. If the
error does not recur, do not replace the FRU.
• Only replace a defective FRU.
Locating FRUs (including CRUs)
Notes:
• So e of the following co ponents are optional.
• To replace a co ponent that is not in the list below, contact a Lenovo service technician. For a list of
Lenovo Support phone nu bers, go to:
http://www.lenovo.co /support/phone
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Figure 8. Locating FRUs (including CRUs)
Self-service CRUs Optional-service CRUs Non-CRUs
1 Co puter cover 4 Wi-Fi card 2 Heat sink fan duct
6 Coin-cell battery 5 Wi-Fi card shield 3 Heat sink and fan asse bly
8 Me ory odule 34 Power supply asse bly 7 Microprocessor
10 M.2 solid-state drive 9 Syste board
11 M.2 solid-state drive bracket 14 Card reader
12 Secondary storage drive bracket 15 Power button board
13 Secondary storage drive (a 2.5-
inch storage drive)
16 Front I/O bracket
Chapter 4.Replacing hardware 13

Self-service CRUs Optional-service CRUs Non-CRUs
18 Optical drive bracket 17 Optical drive cable
19 Optical drive 28 Storage drive cable
20 Front bezel 29 Illu inated red dot
21 Dust shield 30 Ther al sensor
22 Keyboard 31 Internal speaker
23 Mouse 33 Chassis
24 Power cord 35 Wi-Fi antennas (2)
25 Pri ary storage drive (a 2.5-inch
or 3.5-inch storage drive)
36 Cover presence switch (intrusion
switch)
26 Pri ary storage drive bracket
27 Storage converter
32 Vertical stand
37 PCI Express card
Replacing external options
Attention: Do not open your co puter or atte pt any repairs before reading the Important Product
Information Guide.
1. Re ove any edia fro the drives and turn off all connected devices and the co puter.
2. Disconnect all power cords fro electrical outlets and disconnect all cables fro the co puter.
3. Replace external options.
• Vertical stand
Figure 9. Removing the vertical stand
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Figure 10. Assembling the vertical stand
Figure 11. Installing the vertical stand
• Dust shield
Chapter 4.Replacing hardware 15

Figure 12. Removing the dust shield
Figure 13. Installing the dust shield
4. Reconnect the external cables and power cords to the corresponding connectors on the co puter.
Removing the computer cover
Attention: Do not open your co puter or atte pt any repairs before reading the Important Product
Information Guide.
CAUTION:
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