HTC SkyWriter User manual

Doc. No. DOC-00045404 REV.
Issued Date 2008/08/18
Revised Date 2008/08/15 A01
Doc. Title SkyWriter Service Manual Page 1 of 83
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宏達國際電子股份有限公司
HTC Corporation
SkyWriter
Service Manual
HTC Proprietary
Confidential Treatment Requested
Rev. A01
Aug. 15. 2008

Doc. No. DOC-00045404 REV.
Issued Date 2008/08/18
Revised Date 2008/08/15 A01
Doc. Title SkyWriter Service Manual Page 2 of 83
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HTC Corporation
TITLE: Service Manual for SkyWriter Pocket PC Phone
REV.
NO. DATE CONTENTS DEP. REVISED APP
´ D STGE.PER.
Ax01 03/18/2008 First Draft GSD Technical
Support Joy Lu DVT
Ax02 04/15/2008 Second edition/ add WLAN/BT/GPS level 4 repair/
update ch4, ch5, ch7
GSD
Technical
Support Joy Lu DVT
Ax03 06/13/2008
Third edition/ update Ch3 by
listing only useful fixture for
customer/ change Panther to
SkyWriter/ delete battery label in
Ch8.3& 8.4
GSD
Technical
Support Joy Lu DVT
Ax04 07/31/2008 Fourth edition/ update Ch5.3/
5.4 for modified MMI test items
GSD
Technical
Support Joy Lu DVT3-3
A01 08/15/2008
Fifth edition/ update Ch8.1& 8.2
agency label
GSD
Technical
Support Joy Lu DVT4-1

Doc. No. DOC-00045404 REV.
Issued Date 2008/08/18
Revised Date 2008/08/15 A01
Doc. Title SkyWriter Service Manual Page 3 of 83
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Table of Contents
CHAPTER 1 INTRODUCTION······································································································································4
CHAPTER 2 PRODUCT SPECIFICATIONS·················································································································4
CHAPTER 3 SERVICING EQUIPMENT AND TOOLS ·································································································9
CHAPTER 4 ASSEMBLING AND DISASSEMBLING·································································································11
4.1 DEBUG FIXTURE ··············································································································11
4.2 DISASSEMBLING ··············································································································12
4.3 ASSEMBLING···················································································································22
CHAPTER 5 DIAGNOSTIC PROGRAM······················································································································35
5.1 HOW TO ENTER BOOT-LOAD MODE····················································································35
5.2 HOW TO MAKE DIAGNOSTIC CARD·····················································································37
5.3 HOW TO ENTER DIAGNOSTIC PROGRAM ············································································38
5.4 LIST OF DIAGNOSTIC TEST ITEMS·······················································································40
5.5 HOW TO PERFORM THE OS UPGRADING PROCESS VIA MICRO-SD CARD?·····························41
CHAPTER 6 DEVICE CURRENT CONSUMPTION MEASURE ················································································43
CHAPTER 7 TROUBLE SHOOTING GUIDE··············································································································46
7.1 IDENTIFY REPORTED FAILURE SYMPTOM BEFORE REPAIR·····················································46
7.2 HOW TO PERFORM WARM BOOT AND COLD BOOT······························································48
7.3 TROUBLE SHOOTING PROCESS/FAULTY TREE·····································································49
CHAPTER 8 LABELING PLAN (NOT READY)···········································································································65
8.1 AGENCY LABEL-T850UEU······························································································65
8.2 AGENCY LABEL-T850UNA ······························································································67
CHAPTER 9 LCM INSPECTION CRITERIA (FOR NEW LCM)··················································································68
CHAPTER 10 SPARE PARTS LISTAND PHOTO······································································································70
10.1 PHOTOS OF SPARE PARTS······························································································70
CHAPTER 11 BOARD LEVEL REPAIR······················································································································72
11.1 EQUIPMENT AND HAND TOOLS·························································································72
11.2 MAIN BOARD KEY COMPONENT BLOCK: ···········································································73
11.3 WLAN/ BT/GPS TROUBLE SHOOTING PROCESS······························································76
NOTIFICATION ONCE PERFORMING GOLDEN CAP REPLACEMENT ················································81
UNDERFILL RE-WORK PROCESS······························································································82

Doc. No. DOC-00045404 REV.
Issued Date 2008/08/18
Revised Date 2008/08/15 A01
Doc. Title SkyWriter Service Manual Page 4 of 83
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宏達國際電子股份有限公司
HTC Corporation
Chapter 1 Introduction
This manual provides the technical information to support the service activities of SkyWriter
Pocket PC Phone,It contains highly confidential information, so any or all of this document should
not be revealed to any third party.
Chapter 2 Product Specifications
Feature Description
OS Release Crossbow 6.1 AKU 1.0
Dimensions and ID ID intent is to create an update design with a flush front surface.
Processor and
Baseband Dual-Core MSM7201 at 400MHz
RF RTR6275/RFR6500
Memory Flash Storage – 256MB
RAM – 128MB
Power (Talk and
Standby time) Talk Time: 5 hours typical (typical measured with PCL7 or CDG35 with LCD/keyboard at minimum setting)
Standby: > 250 hours UMTS with partial refresh enabled (partial refresh to be controlled by
Polish customization)
Carrier targets must be achieved: Vodafone, AT&T, Orange
Antenna Internal antenna design. Two antenna SKUs will be used to optimize for NA and EU bands.
Co-existence between WI-FI and Bluetooth must be optimized.
Must meet Palm Engineering specifications for RF performance.
•Desense when using Wi-Fi, Bluetooth, GPS
•Head/Hand effect

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•Desense with support peripherals (e.g. extended battery if available)
•Desense in all audio modes.
•Desense when other functions are in use (e.g. camera)
GPS location determination can be made when a phone call is active.
Display / Controller TFT, 320x320 display.
Supports displaying 16 bits (+65,536) of colors out of a palette of 256,000 colors.
Partial refresh will be supported.
Wi-Fi Radio 802.11 b/g (TI chipset)
Co-existence of WLAN data with BT hands-free call or A2DP streaming is required.
IR Supported.
Bluetooth Radio BT 2.0 + EDR. TI chipset.
Co-existence with WLAN data during hands-free call or A2DP streaming is required.
LED Red and Green Led’s will be required on the left hand corner of the front plastics. The LED
must be visible in bright daylight.
Connector Micro-USB
All audio routed to 3.5mm
Camera 2MP FF camera
Flash not supported
No camera SKU required by AT&T
Stylus Stylus included
Hardware buttons •Five-way navigation button
•The application buttons will be backlit
•2 soft keys for Windows Mobile platforms (non-tactile LSK/RSK activates touch

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window)
•Dedicated Power Button
•Dedicated Send and End keys
•4 application buttons (2 application buttons, OK, and Start Key)
•Ringer silence switch
•Wi-Fi push button
•Volume control – the two buttons appear on the left- side of the device to control
volume
•Side center Button: Voice Dialing/PTT/MP3 Button
Expansion Micro SD card
Max capacity: 32GB SDHC
Battery •Rechargeable 1500 mAh, Li-ion
•Removable Battery
•USB Charge not to exceed 500mA
•Heavy User Scenario: Charging limited to 45C for battery safety concerns. Note:
Battery pack may be raised by vendor to 50C.
•Charge time will be 90 minutes based on 1A wall charger specification.
In box wall charger should be specification listed in comments.
Heavy user scenarios must be met with the standard battery to prevent the need of an
Extended Life Battery.

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Issued Date 2008/08/18
Revised Date 2008/08/15 A01
Doc. Title SkyWriter Service Manual Page 7 of 83
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Audio Audio experience based on the following priorities:
•Exceptional voice quality. First priority is a great experience of using the receiver
against your ear. Receiver must pass Palm’s audio spec. Ergonomics of the earpiece are
critical – for example, provide a targetable and comfortable landing area of your ear.
•Second larger speaker for the application of speakerphone, audio/video playback
(MP3), and loud ringtone playback. The speakerphone (off the back of the device) must
be clear and audible even when the device is placed on a table with the screen facing up.
•>32 polyphonic MIDI support (SW) required for ringtones and system sounds.
•Two-speaker architecture
One receiver (front facing) optimized for voice and one speaker (rear facing) for loud
system sounds and speakerphone mode. The speaker cavity must be designed to
minimize the audio leaks and maximize the space necessary to provide a rich audio
experience (benchmark the products against Moto Q and Nokia E61/62).
•Microphone support from the built-in mic and headset. Improve the design and
placement so that the ambient noise is reduced while the user’s voice is clear at the
receiver’s end.
•Headset 3.5mm interface (refer to later section on pinout)
•Bluetooth Hands free call management with SCO and eSCO headsets, and stereo
media with wireless stereo A2DP headsets. The requirements for range and clarity (listed
in the performance section in the Bluetooth FRD) must be met in stand-alone mode, and
with simultaneous data traffic on cellular network (for UMTS networks) or Wi-Fi. The
simultaneous data must not impact the range and/or clarity of the voice call on BT hands
free.
Keyboard Skywriter keyboard usability is critical for messaging centric business customers.
QWERTY / AZERTY / QWERTZ required.

Doc. No. DOC-00045404 REV.
Issued Date 2008/08/18
Revised Date 2008/08/15 A01
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Keyboard will be LED backlit.
Real Time Clock The real time clock must be included to meet a Microsoft LTK requirement.
Accessories Micro-USB and 3.5mm audio connector.
Accessories are defined in a separate document.

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Doc. Title SkyWriter Service Manual Page 9 of 83
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Chapter 3 Servicing Equipment and Tools
Please refer service tools list for detail.
No. Test for Setup for Detail tools/ equipment Photo
1 Soldering tools
Component level Lead-free Soldering station
Disassembly/assembly tools
USB Cable
Headset
AC Adapter
Micro SD Card
2 General tools list System level
PC + monitor

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Revised Date 2008/08/15 A01
Doc. Title SkyWriter Service Manual Page 10 of 83
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Label Printer
Power supply
3 Handset Current
consumption System level
Current series jig
4 Battery
Component level Voltage meter
Manual test fixture
5 All functions Board level
Control box