Lenovo A7600h Service Manual

							Important service information
17 Important notice for replacing a system board
Some components mounted on a system board are very sensitive. Improper 
handling can cause damage to those components, and may cause a system 
malfunction.
Attention: When handling a system board:
• Do not drop the system board or apply any excessive force to it.
• Avoid rough handling of any kind.
• Avoid bending the system board and hard pushing to prevent cracking at 
each BGA (Ball Grid Array) chipset. 
						

							Lenovo A7600 Hardware Maintenance Manual
18
RoHS, The Restriction of Hazardous Substances in Electrical and 
Electronic Equipment Directive (2002/95/EC) is a European Union legal 
requirement affecting the global electronics industry. RoHS requirements 
must be implemented on Lenovo products placed on the market after June 
2006. Products on the market before June 2006 are not required to have 
RoHS compliant parts. If the original FRU parts are non-compliant, 
replacement parts can also be non-compliant. In all cases if the original 
FRU parts are RoHS compliant, the replacement part must also be RoHS 
compliant.
Note: RoHS and non-RoHS FRU part numbers with the same fit and function are 
identified with unique FRU part numbers.
Lenovo plans to transit to RoHS compliance well before the implementation date 
and expects its suppliers to be ready to support Lenovo’s requirements and 
schedule in the EU. Products sold in 2005 and 2006 will contain some RoHS 
compliant FRUs. The following statement pertains to these products and any 
product Lenovo produces containing RoHS compliant FRUs.
RoHS compliant FRUs have unique FRU part numbers. Before or after the RoHS 
implementation date, failed RoHS compliant parts must always be replaced with 
RoHS compliant ones, so only the FRUs identified as compliant in the system 
HMM or direct substitutions for those FRUs may be used.
Note: A direct substitution is a part with a different FRU part number that is 
automatically shipped by the distribution center at the time of the order.
Products marketed before June 2006Products marketed after June 2006
Current or 
original partReplacement 
FRUCurrent or 
original partReplacement 
FRU
Non-RoHSCan be Non-RoHS
Must be RoHSMust be RoHSNon-RoHSCan be RoHS
Non-RoHSCan sub to RoHS
RoHSMust be RoHS
Important information about replacing RoHS compliant FRUs 
						

							General checkout
19
This chapter presents the following information:
• “What to do first” on page 20
• “Power system checkout” on page 21
Before you go to the checkout, make sure to read the following important notes:
General checkout
Important notes:
Only certified trained personnel can service the computer.
Before replacing any FRU, read the entire page on removing and 
replacing FRUs.
When you replace FRUs, use new nylon-coated screws.
Be extremely careful during such write operations as copying, 
saving, or formatting. Drives in the computer that you are servicing 
sequence might have been altered. If you select an incorrect drive, data 
or programs might be overwritten.
Replace an FRU only with another FRU of the correct model. When 
you replace an FRU, make sure that the machine model and the FRU part 
number are correct by referring to the FRU parts list. 
An FRU should not be replaced just 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 cosmic radiation, 
electrostatic discharge, or software errors. Consider replacing an FRU 
only when a problem recurs. If you suspect that an FRU is defective, 
clear the error logs and run the test again. If the error does not recur, do 
not replace the FRU.
Be careful not to replace a nondefective FRU. 
						

							Lenovo A7600 Hardware Maintenance Manual
20
When you do return an FRU, you must include the following information in the 
parts exchange form or parts return form that you attach to it:
1.Name and phone number of servicer
2.Date of service
3.Date on which the machine failed
4.Date of purchase
5.Procedure index and page number in which the failing FRU was detected
6.Failing FRU name and part number
7.Machine type, model number, and serial number
8.Customer’s name and address
Note for warranty: During the warranty period, the customer may be 
responsible for repair costs if the computer damage was caused by misuse, 
accident, modification, unsuitable physical or operating environment, or 
improper maintenance by the customer.
The following is a list of some common items that are not covered under 
warranty and some symptoms that might indicate that the system was subjected 
to stress beyond normal use.
Before checking problems with the computer, determine whether the damage is 
covered under the warranty by referring to the following list:
The following are not covered under warranty:
• LCD panel cracked from the application of excessive force or from being 
dropped
• Scratched (cosmetic) parts
• Distortion, deformation, or discoloration of the cosmetic parts
• Plastic parts, latches, pins, or connectors that have been cracked or broken by 
excessive force
• Damage caused by liquid spilled into the system
• Damage caused by the improper insertion of a PC Card or the installation of 
an incompatible card
• Improper disk insertion or use of an optical drive
• Diskette drive damage caused by pressure on the diskette drive cover, 
foreign material in the drive, or the insertion of a diskette with multiple 
labels
• Damaged or bent diskette eject button
• Fuses blown by attachment of a nonsupported device
• Forgotten computer password (making the computer unusable)
• Sticky keys caused by spilling a liquid onto the keyboard
• Use of an incorrect AC adapter on laptop products
The following symptoms might indicate damage caused by nonwarranted 
activities:
• Missing parts might be a symptom of unauthorized service or modification. 
• If the spindle of a hard disk drive becomes noisy, it may have been subjected 
to excessive force, or dropped.
What to do first 
						

							General checkout
21
To verify a symptom, follow the steps below:
1.Turn off the computer.
2.Remove the battery pack.
3.Connect the AC adapter.
4.Make sure that power is supplied when you turn on the computer.
5.Turn off the computer.
6.Disconnect the AC adapter and install the charged battery pack.
7.Make sure that the battery pack supplies power when you turn on the 
computer.
If you suspect a power problem, see the appropriate one of the following power 
supply checkouts:
• “Checking the Computer AC Charger ” on page 21
• “Checking the internal battery status” on page 22
Checking the Computer AC Charger
When you use the computer AC Charger to charge the tablet but no power is 
charged, see the instructions in this topic to check the computer AC Charger.
To check the computer AC Charger, do the following:
1.Disconnect the micro-USB cable from the tablet.
2.Measure the output voltage across the connector marked B of the micro-USB 
cable. Refer to the following figure:
Note: The output voltage across pin 3 of the micro-B connector might be 
different from the one you are servicing.
3.If the voltage is not correct, replace the micro-USB cable.
4.If the voltage is acceptable, replace the system board.
Power system checkout
Pin
Voltage (V dc)
1
Ground
20
3+5
12 3 (5V) 
						

							Lenovo A7600 Hardware Maintenance Manual
22Checking the internal battery status
To check the battery status of the tablet, do either of the following:
• Approximate information about the battery status
Get the approximate status of the battery at any time by checking the battery 
status icon on the system bar in the upper-right corner of the screen. The 
shorter the green bar is, the less the battery power remains.
 Accurate information about the battery status
To get the accurate information about the battery status of the tablet, do the 
following:
1.Open the Android Settings screen.
To open the Android Settings screen, do either of the following:
– From the main Home screen, touch the Android Settings icon on 
Lenovo Launch Zone. The Android Settings screen is displayed.
– Pull down the application icon from the action bar and then touch 
Settings. The Android Settings screen is displayed.
2.Touch Battery in the Device section on the Android Settings screen.
3.The accurate percentage of the remaining battery power is shown on the 
screen. 
						

							Related service information
23
This chapter presents the following information:
• “Security” on page 23
• “Power management” on page 23
Security settings include: SCREEN SECURITY, SIM CARD LOCK (3G version 
only), PASSWORDS, DEVICE ADMINISTRATION and CREDENTIAL 
STORAGE.
Note: Power management modes are not supported for APM operating system.
To reduce power consumption, the computer has three power management 
modes: screen blank, sleep (standby), and hibernation.
Activating/Deactivating the Display
With the display deactivated, press the Power button on the computer to activate 
the display. The computer display will then illuminate, indicating that it has 
been activated.
If you do not need to use your computer temporarily, you can press the Power 
button to deactivate the display. Your computer will then enter standby mode to 
save power.
Related service information
Security
Power management 
						

							Lenovo A7600 Hardware Maintenance Manual
24
This chapter presents the following product-specific service references and 
product-specific parts information:
• “Specifications” on page 24
• “FRU replacement notices” on page 26
• “Removing and replacing an FRU” on page 27
• “Locations” on page 73
• “Parts list” on page 75
The following table lists the specifications of the Lenovo A7600 tablet.
Table 1. Specifications
FeatureDescription
Size & Weight
Size • 264.10mm x 176.54mm x 8.95mm
Weight • Appr. 550g
System
CPU • 1.3GHz, Quad-core
Hardware Platform • MTK 8382 (3G) / MTK 8121 (WiFi)
RAM • 1GB
Storage Capacity • 16GB / 32GB
LCD • 10.1”, 1,280 x 800 pixels
Integrated Camera • Rear camera, CMOS, 5.0Mega pixels
• Front camera, CMOS, 2.0Mega pixels
Battery • 2-cell lithium battery, 6,340mAh
Operating System
• Android 4.2 (free support to one major version 
upgrade during lifecycle)
Network
• WCDMA (HSPA+ 21mb/s), EDGE
Lenovo A7600
Specifications 
						

							Lenovo A7600
25
Ports
• Micro-USB (USB 2.0), 5-pin
• Earphone, 3.5mm
•SIM card slot
• T-flash card slot
Communication
• WiFi, 802.11b/g/n
• WiFi Direct
• WiFi display
• A-GPS (10s fast positioning)
•Bluetooth 4.0
•FM radio
Others
•Gravity sensor
•Hall sensor
•Vibrator
•Battery manager 
						

							Lenovo A7600 Hardware Maintenance Manual
26
This section presents notices related to removing and replacing parts. Read this 
section carefully before replacing any FRU.
Screw notices
Loose screws can cause a reliability problem. In Lenovo computers, this problem 
is addressed with special nylon-coated screws that have the following 
characteristics:
• They maintain tight connections.
• They do not easily come loose, even with shock or vibration.
• They are harder to tighten.
• Each one should be used only once.
Do the following when you service this machine:
• Keep the screw kit in your tool bag.
• Always use new screws.
• Use a torque screwdriver if you have one.
Tighten screws as follows:
Plastic to plastic
Turn an additional 90° after the screw head touches the surface of the plastic 
part:
Logic card to plastic
Turn an additional 180° after the screw head touches the surface of the logic 
card:
To r q u e  d r i v e r
If you have a torque screwdriver, refer to the “Torque” column for each step.
• Make sure that you use the correct screws. If you have a torque screwdriver, 
tighten all screws firmly to the torque shown in the table. Never use a screw 
that you removed. Use a new one. Make sure that all screws are 
tightened firmly.
• Ensure torque screwdrivers are calibrated correctly following country 
specifications.
FRU replacement notices
more than 90°
(Cross-section)
more than 180°
(Cross-section)