Acer HARLEY TAB A3-A20 User manual

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HARLEY TAB A3-A20/A3-A20FHD
SERVICE GUIDE

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Table of Contents
Chapter 1 Product Features and Hardware Specifications
Features………………………………………………….…………………………..……....…1-3
Tablet Tour…………………………………………………………………………….……......…4
Front View………………………………………………………………………….…...5
Rear View………………………………………………………………………….……6
Top View………………………………………………………………………….….….7
Bottom View………………………………………………………………………...….8
Left View……………………………………………………………………….……..…9
Right View……………………………………………………..……………...…...….10
System Block Diagram……………………………………………………………………..…..11
Chapter 2 Diagnostic Utilities
Introduction………………………………………………………………...………………….…12
Flash Tool SOP…………………………………………………………….........................12-18
Writing Tool SOP……………………………………………………………………............19-32
Re-write Country Code SOP………………………...…………………………………………33
How to Check Wifi Channel………………………………………………………………..34-38
Chapter 3 Service and Maintenance
Introduction……………………………………………………………………………….…..….39
Disassembly and Assembly Guide…………………………………………………..........39-51
L2 Troubleshooting Guide………………………………………………………….……....52-62
Chapter 4 Diagnostic Tool SOP
Index…………………………………………………………………………………………..….64
Introduction and Installation Method…………………………………………...……..…..65-66
Test Items and Function Description…………………………………………..……….....67-69
Operational Methods of Test Items……………………………………………………………69
Test Content Description……………………………………………………………...........70-88
Chapter 5 Serial Number Definition
Introduction of Acer FG SN…………………………………………………………...……89-96
Introduction of Acer KC PN and Acer KC SN……………………………………….........97-98
Chapter 6 FRU (Field Replaceable Unit) List
Exploded Diagram………………………………………………………………..………100-102
FRU List………………………………………………………………………………..….103-104

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Revision History
Please refer to the table below for the updates made on this service guide.
Date
Chapter
Update
Copyright
Copyright 2014 byAcer 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 representatives or warranties, either expressed or implied,
with respect to the contents hereof and specifically 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 program 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.
Other brand and product names are trademarks and/or registered trademarks of their
respective holders.

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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 requirement 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
Product Features and Hardware Specifications
Product Features and Hardware Specifications
Features………………………………………………….……………………..……….………1-2
Tablet Tour…………………………………………………………………………………..…….3
Front View………………………………………………………………………..….....4
Rear View………………………………………………………………………………5
Top View…………………………………………………………………………….….6
Bottom View………………………………………………………………………...….7
Left View……………………………………………………………………………..…8
Right View………………………………………………………………………..…….9
System Block Diagram………………………………………………………………….……...10

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Product Features and Hardware Specifications
Features
Following is a summary of the tablet’s main features:
Harley Quick Spec.
Category
Specification & Requirements
Form Factor
10.1‖ Tablet
Operating system
Android KitKat system (4.4)
Dimensions and weight
Dimension
256 (L) x 171.1 (W) x 8.99 (T) mm
Weight
WIFI HD SKU < 540 g
CPU
HD SKU: MTK MT8127 (MT8127A/B) Quad Cortex A7@1.3GHz , Mali450 MP4
Memory
HD SKU: RAM- DDR3L 1GB,
LCM
10.1‖ HD, 16:10 LCM (1280(H) x 800(V)), TFT panel
LED backlight, IPS
Wide view angle 85/85/85/85 degree
MIPI interface
Active Area : 216.96 (H) x 135.6 (V) [mm]
TTL Solution brightness: (TBD) nits (LCD: 350 nits)
Contrast ratio 800:1
Storage
HD SKU:, eMMC-16GB/32GB
GPS
Standalone GPS without GLONASS
Camera
Front camera : 2MP Camera with Fix Focus
Preview 30 fps@ 800x600
Photo capture at 24fps @ 1600x1200 in JPEG
Video capture recording at 30fps @ VGA
Rear camera : 5MP Camera with Auto Focus
Preview 30fps(15 fps)@ 2560x1920
Photo capture at 30fps(15 fps) @ 2560x1920 in JPEG

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Harley Quick Spec.
Category
Specification & Requirements
Connectivity
Bluetooth® 4.0
Wi-Fi IEEE 802.11 b/g/n
HDMI 1 x Micro HDMI, support HDCP 1.0
USB
x Micro USB 2.0 Type B port, support OTG
BT profile support
BT Protocol & Low Layer BT Profile
RF / RFPHY / BB / LMP / LL / L2CAP / SDP / GAP / RFComm / ATT /
GATT / SM /AVCTP / AVDTP / GAVDP
High Layer BT Profile
A2DP /AVRCP / DI (DID) / HID / HOGP / OPP / SPP
Other
IOP
Input
Touch Sensor
GFF touch sensor.
Touch sensor AA area covers 1.2mm outside LCM AA area.
Touch Controller
Goodix GT9110 , 10-point touch controller IC
Minimum 100 valid touch points per second at 1-point touch touch
scenario.
Minimum 60 valid touch points per second at 10-point touch scenario.
Function buttons
Side (mechanical key):
-Volume Up, Volume Down
-Power: Indicator with orange back light, power-on when charging
Sensors
G-Sensor
Output
NA
Audio
Single Analog Microphone
2 Speaker
3.5mm Audio Jack 4-ring (with Mic)
Expansion Slot
Support MicroSD memory card push push type
Battery
Rechargeable Lithium-ion polymer battery
Capacity: 21.6W (4700 mAh cell , 1S2P)
Battery-life (TBD)
Video playback: up to 7 hours when play 720P H.264 video playback on
system (not streaming, Wifi/3G/BT off, total solution 150 nits)
Stand-by on fly mode: up to (TBC) hours (LCD off)
AC Adapter
Voltage range/frequency: 100 ~ 240V AC, 50/60Hz
DC output: 5V and 2A, 10W
Cable length of adapter is with 100cm
Black color

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Harley Quick Spec.
Category
Specification & Requirements
Green requirement
Rohs compliance
WEEE compliance
Hologen free, at least PVC free
SMT Green process
Others
Reset hole
Accessory (in Box)
Charger + Plug

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Tablet Tour
Six View

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Front View
Figure 1.1 Front View
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Item
Description
1
Touch Screen
CTP
2
Front Camera
Front Camera_6*6*4.2_200W_HI257_FF_ZIF connector
1
2

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Rear View
Figure 1.2 Rear View
#
Item
Description
1
Rear Cover Module
Rear Cover Module includes rear cover, rear camera lens
2
Rear Camera
Rear Camera_8.5x8.5x4.75_500w_OV5648_AF_BTB connector
1
2

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Top View
Figure 1.3 Top View
#
Item
Description
1
Volume Key
Increases or decreases the tablet volume.
2
Up Key
+ Up Key
3
Down Key
- Down Key
1
2
3

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Bottom View
Figure 1.4 Bottom View

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Left View
Figure 1.5 Left View
#
Item
Description
1
Power Key
• Press and hold to turn the tablet on or off.
• Press briefly to turn the screen on/off or enter sleep mode.
2
HDMI Port
Used for image transmission
3
USB Port
Used for charging
4
Headset Jack
Connected to stereo headphones
5
SD Card Slot
Used for inserting SD card
6
SIM Card Slot
Used for inserting SIM card
2
3
1
4
5
6

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Right View
Figure 1.6 Right View

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System Block Diagram

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CHAPTER 2
Diagnostic Utilities
Introduction
The HARLEY HD TAB has a flash tool designed to software upgrading and a writing tool
designed to write SN/IMEI/BT/Wifi/Country Code.
Flash Tool SOP
This document will give the instructions of Harley’s Flash Tool. It includes two parts: the
open of flash tool and the download of a version.
1. Open flash tool
After decompressing the flash tool archive, the flash_tool.exe shown as Figure1 is the tool
that we need.
Figure 1 The location of flash_tool.exe
Double check the flash_tool.exe, Figure 2 will show up, and after the ―ok‖ button is clicked,
we will enter into the download interface (Figure 3). The download of Harley’s versions will be
operated in this interface. By now, we can start to use the flash tool.

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Figure 2 The dialog shows up while double check the flash_tool.exe
Figure 3 The download interface of flash tool

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Figure 4 The format interface of flash tool (forbidden)
As Figure 4 shows, the ―Format‖ interface is forbidden to use. We just need to use the
―Download‖ interface shown as Figure3.
2. Download a Harley’s version
The download of a Harley’s version involves two parts: the download of secro-sign.img and
the download of the whole version.
(1) The download of secro-sign.img
It includes three steps shown as Figure 5, Figure6 and Figure 7.
Figure 5 Select a version

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Step 1 and Step 2: click the ―Scatter-loading‖ button to find MT6582_Android_scatter.txt
inside of Rework-Serco folder. And then click the ―open‖ button.
Figure 6 Find MT6582_Android_scatter.txt inside of Rework-Secro folder
Figure 7 Download secro-sign.img
Step 3: make sure the download pattern is ―Download Only‖, only secro-sign.img existed
and checked. Click the ―Download‖ button to download the secro-sign.img, and then connect
the android device after power failure with the computer through USB. When the download ok
dialog shows up, it means the download of secro-sign.img has been completed.