Acer B1-720 User manual

B1-720
S E R V I C E G U I D E

i
Table of Contents
Chapter 1. Hardware Specifications and Configurations
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Tablet Tour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Right View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Left View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Specifications Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Chapter 2. Diagnostic Utilities
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Diagnostic Tool SOP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Testing User Interface (UI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Test Report UI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
CSDDL Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Using the CSDDL Tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
NVRAM Writer Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Using the NVRAM Writer Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
G-Sensor Calibration Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
Using the G-Sensor Calibration Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
Chapter 3. Jumper and Connector Locations
Mainboard Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Mainboard Bottom View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Chapter 4. Troubleshooting
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Power On Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
No Display Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
LCD Picture Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Touch Screen Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Internal Speaker Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Extend Earphone Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
USB Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Camera Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
WiFi & BT Function Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
GPS Function Test Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Other Functions Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Chapter 5. Service and Maintenance
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Recommended Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Maintenance Flowchart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Micro SD Card Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

ii
Micro SD Card Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Lower Case Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Lower Case Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Speaker Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
Speaker Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Microphone Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
Microphone Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
Mainboard Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
Mainboard Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28
Battery Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-32
Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-33
Camera Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-34
Camera Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-35
Chapter 6. FRU (Field Replaceable Unit) List
Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
FRU List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Screw List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Chapter 7. Test Compatible Components
Android OS Environment Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
B1-720 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Chapter 8. Online Support Information
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

iii
Revision History
Please refer to the table below for the updates made on this service guide.
Copyright
Copyright © 2013 by Acer Incorporated. All rights reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language
or computer language, in any form or by any means, electronic, mechanical, magnetic, optical,
chemical, manual or otherwise, without the prior written permission of Acer Incorporated.
Disclaimer
The information in this guide is subject to change without notice.
Acer Incorporated makes no representations or warranties, either expressed or implied, with
respect to the contents hereof and specifically disclaims any warranties of merchantability or fitness
for any particular purpose. Any Acer Incorporated software described in this manual is sold or
licensed "as is". Should the programs prove defective following their purchase, the buyer (and not
Acer Incorporated, its distributor, or its dealer) assumes the entire cost of all necessary servicing,
repair, and any incidental or consequential damages resulting from any defect in the software.
Acer is a registered trademark of Acer Corporation.
Intel is a registered trademark of Intel Corporation.
Other brand and product names are trademarks and/or registered trademarks of their respective
holders.
Date Chapter Updates
12/31/2013 1-8 First release

iv
Conventions
The following conventions are used in this manual:
The following typographical conventions are used in this document:
• Book titles, directory names, file names, path names, and program/process names are shown
in italics.
Example:
the DRS5 User's Guide
/usr/local/bin/fd
the /TPH15spool_M program
• Computer output (text that represents information displayed on a computer screen, such as
menus, prompts, responses to input, and error messages) are shown in constant width.
Example:
[01] The server has been stopped
• User input (text that represents information entered by a computer user, such as command
names, option letters, and words) are shown in constant width bold. Variables contained within
user input are shown in angle brackets (< >).
Example:
At the prompt, type run <file name> -m
• Keyboard keys are shown in bold italics.
Example:
After entering data, press Enter.
• Screen output (text that represents information displayed on the system, such as menus,
prompts, responses to input, and error messages) are shown in bold.
Example:
On the main menu, select OK.
WARNING:
Indicates a potential for personal injury.
CAUTION:
Indicates a potential loss of data or damage to equipment.
IMPORTANT:
Indicates information that is important to know for the proper completion of a
procedure, choice of an option, or completing a task.
NOTE:
Gives bits and pieces of additional information related to the current topic.

v
General Information
This Service Guide provides you with all technical information relating to the basic configuration for
Acer's global product offering. To better fit local market requirements and enhance product
competitiveness, your regional office may have decided to extend the functionality of a machine
(e.g. add-on card, modem, or extra memory capabilities). These localized features are not covered
in this generic service guide. In such cases, contact your regional offices or the responsible
personnel/channel to provide you with further technical details.
When ordering FRU parts:
Check the most up-to-date information available on your regional web or channel. If, for whatever
reason, a part number change is made, it may not be noted in this printed service guide.
For Acer-authorized service providers:
Your Acer office may have a different part number code than those given in the FRU list of this
printed service guide. The list provided by your regional Acer office must be used to order FRU
parts for repair and service of customer machines.

CHAPTER 1
Hardware Specifications and Configurations
Hardware Specifications and Configurations . . . . . . . . . . . . . . . . .1-2
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Tablet Tour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Right View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Left View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Specifications Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

1-2 Hardware Specifications and Configurations
Hardware Specifications and Configurations
Features
The following is a summary of the computer’s many features:
Form Factor
•7”Tablet
Operating System
• Android Jelly Bean 4.2
Platform
• MTK MT8111 Dual Core Cortex A7 1.3 GHz processor
System Memory
• RAM: DDR3 1GB
• eMMC: 8GB / 16GB
Display
LCM
• 7” WSVGA LCM (1024 x 600, 169PPI)
Low voltage
Wide viewing angle
High-brightness LED-backlit TFT LCD with integrated multi-touch
LVDS interface
Audio Subsystem
• Microphone
• Speaker
• 3.5mm Audio Jack
Camera
Front Camera
13P2SF001 (0.3M)
• Image Sensor : OV7675-SOC, 1/9''
• Output format:RAW RGB,YUV422,ITU656,RGB565
• Image capture at 30fps @ VGA 640 x 480
• Video capture at 30fps @ VGA 640 x 480

Hardware Specifications and Configurations 1-3
CIFC01920004970LH (0.3M)
• Image Sensor : OV7675
• Output format: YUV4:2:2 / YCbCr422, raw RGB, ITU656, RGB565
• Image capture at 30fps @ VGA 640 x 480
• Video capture at 30fps @ VGA 640 x 480
Connectivity
WLAN
• IEEE 802.11 b/g/n
Bluetooth
• Bluetooth®4.0
GPS
• Typical tracking sensitivity of -163dBm
• Supports external LNA
Expansion Slot
• MicroSD memory card up to 32G (SDHC 2.0 compatible)
• USB Micro-B port, supporting USB 2.0 client
Special Keys and Controls
• Capacitive Multi-Touch Screen
• Touch controller - Goodix GT927
• Function buttons
Side (mechanical key):
• Volume Up, Volume Down
•Power
Sensors
•G-Sensor
I/O Ports
• USB Micro-B port (supports USB 2.0 client)
• Audio port (headphones & microphone
• MicroSD card reader

1-4 Hardware Specifications and Configurations
Dimensions and Weight
Dimension
• 122 (W) x 199 (D) x 10.7/10.7 (H) mm (4.8 x 7.83 x 0.42/0.42 inches)
Weight
• 315g (0.69 lbs) with 1-cell battery pack
Power Adapter and Battery
Battery
• 11.2 Wh 2955 mAh 3.8 V 1-cell Li-polymer battery pack
• Battery-life:
Up to 4.5 hours (based on video playback test results)
Power Adapter
• 2-pin 10 W AC adapter:
75.3 (W) x 45 (D) x 33.8 (H) mm
75 g, without DC cable
AC power plug is interchangeable
• 2-pin 7 W AC adapter:
38 (W) x 38 (D) x 27.7 (H) mm
40 g, without DC cable
Fixed AC pins
Others (SW)
• Top HD Games Portal
• Acer Portal (AcerCloud)
• Google Mobile Services (except China region)
Green Requirement
• Rohs compliance
• WEEE compliance
• SMT Green process

Hardware Specifications and Configurations 1-5
Tablet Tour
Front View
Figure 1-1. Front View
Table 1-1. Front View
#Item Description
1 Microphone Receives audio input.
2 Speaker Emits stereo audio.
3 Touch Screen 7-inch, 1024 x 600 capacitive touch screen.
4 Camera A 0.3-megapixel camera for video chatting and self-portrait
images.
1
4
2
3

1-6 Hardware Specifications and Configurations
Rear View
Figure 1-2. Rear View
Table 1-2. Rear View
#Item Description
1 Card Slot Insert a microSD card into the slot.
2 Volume Control Increases or decreases the tablet volume.
1
2

Hardware Specifications and Configurations 1-7
Top View
Figure 1-3. Top View
Table 1-3. Top View
#Item Description
1 Headset Jack Connects to stereo headphones.
2 USB Micro-B Port Connects to a computer or power adapter with a USB
cable.
3 Power Button
• Press and hold to turn the tablet on or off.
• Press briefly to turn the screen on/off or enter sleep
mode.
123

1-8 Hardware Specifications and Configurations
Right View
Figure 1-4. Right View
Table 1-4. Right View
#Item Description
1 Volume Control Increases or decreases the tablet volume.
1

Hardware Specifications and Configurations 1-9
Left View
Figure 1-5. Left View
Table 1-5. Left View
#Item Description
1 Card Slot Insert a microSD card into the slot.
1

1-10 Hardware Specifications and Configurations
System Block Diagram
Figure 1-6. System Block Diagram
LVDS
WB_CTRL,EINT
WB_TX,RX
CONN.
MT6627
WIFI BT4.0 GPS*
External Memory Interface
USB 2.0
KCOL
Touch Sensor IC Goodix GT927
micro USB, client
Front Camera
YUV,I2C
PWM
RGB
I2C
EINT
I2C,EINT
Battery Input
Speaker
MT8193
MT6323 PMIC
AUDIO LDO OUTPUT BUCK OUTPUT CHARGER
Battery
LDO Output
BUCK Output
I2S, SPI, EINT, I2C
G Sensor
Sidekey (volume up)
eMMC
8G/16G
MSDC0 MSDC1
UART1
micro SD
JTAG
MT8111 Cortex-A7 1.3GHz Dual-Core
Debug Port
DDR3L 1GB (512M X 8bits *2 Pcs)
UART0
LCM
26MHz
MIC
combo JACK
WIFI/BT
GPS
switching Charger
I2C,EINT
I2C,EINT
Max. support VRAM size : 2GB.
CONN.
Capacitive Touch Panel
Kionix_KXTIK-1009
GPS_TX,RX
26MHz
Russian Sku
MT3332
GLONASS
UART1, EINT
GPS
26MHz
32.768KHz
Sidekey(volume down)
power key
FCHR_ENB

Hardware Specifications and Configurations 1-11
Specifications Table
Computer specifications
Item Metric Imperial
Dimensions
Length 199.0 mm 7.9 in
Width 122.3 mm 4.8 in
Height (front to rear) 10.7 mm 0.45 in
Weight (equipped with optical
drive, flash drive, and battery) 320 g 0.7 lb
Weight (equipped with optical
drive, flash drive, and without
battery)
N/A (Embedded Battery) N/A (Embedded Battery)
Input power
Operating voltage AC Input: 90V ~ 264V/DC Output: 5.25V(7W); 5.35V(10W)
Operating current
• AC Input: 0.25A(7W); 0.4A(10W)
• DC Output:1.35A(7W); 2A(10W)
Temperature
Operating 3ºC ~ 40ºC 37ºF ~ 104ºF
Non-operating -20ºC ~ 60ºC -4ºF ~ 140ºF
Relative humidity
Operating 0% ~ 80%
Non-operating 0% ~ 80%
Maximum altitude (unpressurized)
Operating 0 ~ 63 cm 0 ~ 2.48 in.
Non-operating
Shock
Operating Amplitude: 105G
Non-operating Amplitude: 220G
Random vibration
Operating 1.644 grms
Non-operating N/A
NOTE:
Applicable product safety standards specify thermal limits for plastic surfaces. The computer
operates well within this range of temperatures.

1-12 Hardware Specifications and Configurations
System Board Major Chips
Item Specification
CPU MTK_ MT8111V
Graphics Processor N/A
LVDS transmitter S IC MT8193A/B BGA 150P TRANSMITTER / MT8193
PMU S IC MT6323GA/A VFBGA 145P PMIC
DDR3L DDR3 1GB
ULPI Phy for USB N/A
Bluetooth S IC MT6627N/A QFN 40P WLAN BT FM
Wireless S IC MT6627N/A QFN 40P WLAN BT FM
GPS S IC MT6627N/A QFN 40P WLAN BT FM
GPS Low-Noise Amplifier N/A
TOUCH controller GOODIX_GT927
eMMC 8GB / 16GB
CAMERA CAMERA M 13P2SF001 LITEON 0.3M 0FA
Thermal Sensor N/A
Audio codec MT6323GA-A_VFBGA145 (Embedded in PMU)
Audio Amplifier MT6323GA-A_VFBGA145 (Embedded in PMU)
Echo Cancellation N/A
Battery Charger S IC BQ24196RGER VQFN 24P PWM
Embedded Controller IC N/A
Compass N/A
Gyro N/A
G-Sensor KIONIX _ KXTIK-1009
ALS/Proximity N/A

Hardware Specifications and Configurations 1-13
Processor
Processor Specifications
No CPU Fan for this product
No Graphics Controller
No BIOS Setup Menu for this product
No Keyboard for this product
System Memory-DDR3L
System Memory-eMMC (Any conflict, the latest AVL shall prevail)
Item Specification
CPU
MTK_MT8111V
AP MCU:
• Dual-core ARM®Cortex-A7 MPCoreTM operating at 1.3 GHz
CPU package FCCSP 10.6mm*11.0mm, 475-ball, 0.4mm pitch package
Item CPU
Speed Cores Bus Speed
(FSB/DMI/QBI)
Mfg
Tech Cache Size Package Core Voltage
MT811
1V
1.3
GHz
Dual
Core N/A 28nm
32KB L1 I-
cache and
32KB L1 D-
cache
FCCSP
10.6mm*11
.0mm, 475-
ball
1.15V
Item Specification
Memory controller Embedded in CPU
Memory size 1GB DDR3
Item Specification
Vendor &
Model Name
Hynix 8G
H26M42003
GMR
Kingston 8G
KE4CN3K6
A-A58
Samsung
8G
KLM8G1W
EMB-B031
Kingston
16G
KE4CN4K6
A-A58
Samsung
16G
FLKLMAG2W
EMB-B031
Capacity (GB) 8G 8G 8G 16G 16G
DC Power Requirements
Voltage
tolerance
VCC: 3.3V
VCCQ: 1.8V

1-14 Hardware Specifications and Configurations
LAN Interface
Bluetooth Interface
Bluetooth Module
Item Specification
LAN Chipset No support on board LAN
LAN connector type N/A
LAN connector location N/A
Item Specification
Chipset MT6627
Data throughput Max 3Mbps
Protocol Bluetooth 2.1+Enhanced Data Rate (EDR) / BT3.0+HS/
BT4.0
Interface Analog IQ
Connector type N/A
Supported protocol N/A
Item Specification
Controller GPIO
Features
• Bluetooth specification v2.1+EDR
• Bluetooth specification v3.0+HS compliance
• Bluetooth v4.0 Low Energy (LE)
• Integrated PA with 6dBm (class 1) transmit power
• Typical Rx sensitivity with companion chip modem: GFSK
-92.5dBm, DQPSK -91.5dBm, 8-DPSK -86dBm
• Lowe-power scan function to reduce power consumption
in scan modes