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
© Copyright Lenovo 2018 i

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.
© Copyright Lenovo 2018 1

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
6M725s User Guide and Hardware Maintenance Manual