Lenovo I360 Maintenance Manual

Brand: Lenovo

Model: I360

Type: Maintenance Manual

I360 Mobile Phone Maintenance Manual v0.1

I360 Mobile Phone Maintenance

Manual

Lenovo Mobile Telecommunications Co., Ltd.

All information contained herein, including the text, diagrams, data,

graphics, images, methods and ideas, is the property of Lenovo Mobile

Communications Co., Ltd. and shall not be disclosed, copied,

duplicated, photographed and transferred in any way by any individual

and organization without the written approval of the Mobile

Communication Office of Lenovo Research Institute.

Lenovo Mobile Telecommunications Co., Ltd.

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 1 of 1

I360 Mobile Phone Maintenance Manual v0.1

Contents

Preface............................................................................................................................................3

1. Specifications....................................................................................................................................4

2 Working Principles......................................................................................................................................5

2.1 GSM System Description.................................................................................................6

2.1.1 General Introduction to Cellular Theory...............................................................................6

2.1.2 GSM Description .............................................................................................................6

2.1.3 Service Area................................................................................................................9

2.1.4 Baseband Block Diagram....................................................................................................10

2.2 GSM Processor and Voice Baseband Codec .................................................................................. 11

2.3 GSM Processor ..............................................................................................................................12

2.3.1 Mcu Chip.............................................................................................................................12

2.3.2 ABB chip.............................................................................................................................13

3. Disassembly .............................................................................................................................................14

3.1 Recommended tools.......................................................................................................................15

3.2 Disassembling Steps.......................................................................................................................15

4 I360 Assembly Steps..............................................................................................................................16

5 Troubleshooting ........................................................................................................................................16

5.1 Block Diagram of Troubleshooting................................................................................................16

5.2 Problem Identification and Maintenance................................................................17

5.2.1 Block Diagram and Modules Description...........................................................................17

5.2.2 Baseband troubleshooting ...................................................................................................20

5.2.3 RF Troubleshooting..........................................................................................................24

6. Engineering Mode....................................................................................................................................28

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 2 of 2

I360 Mobile Phone Maintenance Manual v0.1

Preface

I360 is a bar-style GSM (GPRS) WAP mobile phone developed by Lenovo

Mobile Telecommunications Co., Ltd.

Services for this product are divided into three levels:

1、 Level 1 is for elementary services. With no specialized

maintenance tools available, only empirical maintenance

service is offered. Usually a heat gun is not required, and an IC

problem cannot be solved. IC troubleshooting is offered only

when necessary with the manufacturer’s permission.

2、 Level 2 is intended to solve problems that cannot be solved at

level 1. If necessary, specialized maintenance tools can be used

such as the heat gun, electric soldering iron, oscilloscope and

communications system analyzer. Any element of the phone

can be serviced at this level, and the service technicians will try

their best to solve various problems.

3、 Level 3 is for problems that cannot be solved at level 2. These

problems will be solved by the research and development

center of the manufacturer.

Important statement:

The target readers of this service manual are experienced technicians

familiar with similar devices. This manual is intended to technically assist

electronic and mechanical maintenance, suitable for I360 Level 2 maintenance

technicians. If the problems cannot be solved with the help of this manual,

please contact the Customer Support or the Development and Research Center

of Lenovo Mobile Telecommunications Co., Ltd. Thanks.

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 3 of 3

I360 Mobile Phone Maintenance Manual v0.1

1. Specifications

Table 1. Radio Frequency

Radio Frequency (900MHz)

Frequency range

Transmit: 880-915MHz；Reception:

925-960MHz

Bandwidth per channel 200 kHz

Number of channels

174 channels x8 (TDMA)

Carrier modulation GMSK (Gaussian Minimum Shift Keying)

Duplex bandwidth 45 MHz

Frequency stability

±0.1 ppm

Output power

33±2dBm - 5±5dBm

Reception sensitivity -104 dBm

Radio Frequency (1,800MHz)

Frequency range

Transmit: 1710-1785 MHz； Reception:

1805-1880 MHz

Bandwidth/channel 200 kHz

Number of channels

374 x 8 (TDMA)

Carrier modulation GMSK (Gaussian Minimum Shift Keying)

Duplex bandwidth 95 MHz

Frequency stability

± 0.1 ppm

Output power

30±2dBm - 0±5dBm

Reception sensitivity -105 dBm

Ambient temperature

-10 -- +55℃

GPRS feature

GPRS CLASS 8

Table 2. Operation voltage

Operation voltage

Li-polymer battery DC 3.4-4.2 V

Table 3. Power consumption

Power consumption

Average operation current < 250 mA

Standby current < 9 mA

Talk time* 90--150min (When using 680mAH lithium

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 4 of 4

I360 Mobile Phone Maintenance Manual v0.1

battery)

Standby time*

60--80h (When using 680mAH lithium battery)

Data sharing with PC Supported (specialized transmission cable

required)

* Depends on the network used.

2 Working Principles

Baseband Structure

Block Diagram

Voice

band/Baseband

coder

Radio

receptio

GSM/GPRS

Processor

128Mbit

FALSH

Backlight

Displayer

Keypad

SIM

Data terminal

ada

tation

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 5 of 5

I360 Mobile Phone Maintenance Manual v0.1

2.1 GSM System Description

2.1.1 General Introduction to Cellular Theory

A cellular system differs from other wireless telephone systems by dividing the service

area into many contiguous cells, which enables more powerful call processing and higher

system utilization. Each cell contains a base station which is capable of transmitting and

receiving signals, and is allocated with a set frequency pair (channel) for duplex

communications. Covering a relatively small area, each cell requires lower transmission

power than other wireless systems. So in a cellular system, the wireless transmission over a

specific channel involves the cell containing this channel and the immediate neighbor cells.

And since a cell corresponding to a specific channel covers a limited small area (compared

with the area covered by the whole system), the same channel can be reused by another cell

which is far away enough. This makes it possible for multiple subscribers to use the same

channel separately within the same geographical region.

2.1.2 GSM Description

The GSM system utilizes digital wireless communications technology, which makes it

different from previous cellular systems. Compared with older analog systems, the GSM

system enjoys many advantages which include the following:

A. International Roaming -- Since the universal GSM specifications are adopted

internationally, subscribers can dial or answer an international call in any country with

GSM support.

B. Digital wireless interface – A GSM phone provides a complete digital link between

a base station and a subscriber. In other words, a GSM phone provides a digital link

into the switching center and the traditional PSTN.

C. Compatible with ISDN – As the digital communications specification adopted in

many countries, ISDN can be used to transmit voice and data over copper links. A GSM

phone can offer features similar to those of a ISDN phone.

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 6 of 6

I360 Mobile Phone Maintenance Manual v0.1

D. Security and privacy -- While analog calls can be easily intercepted by portable

wireless receivers, GSM calls are encrypted and transmitted digitally, which are of high

security.

E. High quality voice – Problems such as channel interference, switching interrupts

and attenuation are properly handled in the digital system, and error code correction

(reorganizing missed data) also helps to improve voice quality.

F. Efficiency -- The GSM system can utilize the frequency band more efficiently than

traditional analog systems.

As shown in Figure 2 given below, the area bounded by the bold line represents the

total area to be covered by the imagined system. The whole area is divided into multiple cells,

with a base station in each cell. The cells work with specific channels and connect the

wireless phone subscribers to the mobile switching center. A mobile phone can utilize any of

the channels of the system, which means the mobile phone can be used in any of the cells.

Within any specific cell, the wireless communication requires lower power, so the channels

can be reused by cells which do not intersect with each other.

For instance, in Figure 2, cell A utilizes channels 1--8, cell B utilizes channels 9--16,

cell C utilizes channels 17--24, and cell D utilizes channels 1--8 again. So channels 1--8 are

used repeatedly, which means subscribers in cell A and cell D can use channels 1--8

simultaneously.

This frequency multiplexing increases the calls processing capability of the wireless

system, and it is unnecessary to increase the number of channels available. When the same

frequency is multiplexed within a community, the interference between the channels cannot

CELL A

CHANNELS

1-8

CELL B

CHANNELS

9-16

CELL C

CHANNELS

17-24

CELL D

CHANNELS

1-8

CELL F

CHANNELS

17-24

CELL E

CHANNELS

9-16

Figure 2: Hypothetical

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 7 of 7

I360 Mobile Phone Maintenance Manual v0.1

be ignored. The GSM system is more capable of enduring inter-channel interference. With

digital modulation, forward correction and equalization, GSM cells are more adjacent to each

other than similar analog cells. So frequency multiplexing improves the GSM system and

enables more powerful calls processing for frequently used areas.

Combined with Time Division Multiple Address (TDMA) technique, the same carrier

can be shared by multiple calls. A carrier is divided into several continuous TDMA frame

streams. And a frame is divided into 8 time slices. For each connection, a specific time slice

is assigned to each subscriber in each TDMA frame. Subscriber’s voice and data are

transmitted digitally and divided into several segments. subscriber’s data segments are

transmitted within the corresponding time slices as burst pulses.

The segments are modulated onto carriers via Gaussian Minimum Shift Keying

(GMSK). Phase Shift Keying (PSK) is a very effective modulation scheme. Different

frequencies can be used whenever a data pulse is transmitted, and this procedure is called

frequency-hopping, which helps reducing impact of the attenuation and improves the security

and privacy of the wireless connection. A GSM wireless call demands to transmit the

corresponding pulse in each frame, but the pulses may not be transmitted continuously. So

the unit should be made more efficient.

When a mobile phone is moved from one cell to another cell, measures should be taken

to reduce the inconvenience as much as possible to the subscriber. During the movement, the

signal strength of adjacent cells should be measured, and the channel quality should be

judged by the mobile phone and the base station. Cross-cell switching requirements should

be clearly defined, and the switching should be carried out before the voice quality over a

channel has fallen down to a sensible extent.

When a mobile phone is located at the center of a cell, the signal is very strong; when the

phone is moved to the edge of the cell, the signal turns weak. The information contained in

the signal indicates the distance between the subscriber and the base station. When a mobile

phone is moved from one cell to another cell, the base station of the new cell takes over the

control of this phone. The treatment of the distance changes between the mobile phone and

the base station are completely transparent to the subscriber.

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 8 of 8

I360 Mobile Phone Maintenance Manual v0.1

2.1.3 Service Area

Calls within the service area can be positioned and received by the system administrator

(for a wireless system, there are no definite geographical boundaries.) If a mobile phone is

located outside of the coverage area, Out of Service will be prompted, and the phone cannot

locate and receive a call. If the movement occurs during a call, the current call would abort.

For some special service area, there may be communications interrupts for some part of the

area.

The mobile phone’s identity information is kept in the Host Location Register (HLR)

and Visiting Location Register (VLR) of the local GSM system. VLR contains identity

information of all wireless phones enabled locally. When roaming into another mobile

communications network, the identity information of a mobile phone will be sent to the VLR

of the new network. The new network will carefully check the identity information. Once the

authenticity is verified, roaming features will be enabled.

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 9 of 9

I360 Mobile Phone Maintenance Manual v0.1

2.1.4 Baseband Block Diagram

Radio frequency block diagram

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 10 of 10

I360 Mobile Phone Maintenance Manual v0.1

2.2 GSM Processor and Voice Baseband Codec

2.2.1 Mcu chip consists of some elements, including ARM7TDMI microcontroller,

which is in charge of channel coding/decoding and running protocols and applications; a

16-bit digital signal processor (DSP), which produces full speed and enhanced full speed

voice and a high performance, soft decision Viterbi equalizer, which is built-in software

in the DSP. The ARM7TDMI microcontroller runs protocols at layers 1, 2 and 3, and

executes the human-machine interface software.

2.2.2 The ABB chip performs audio and baseband A/D and D/A conversion, acting

as an interface to the digital elements of the chipset and to the speaker and wireless

module. The auxiliary converters in the ABB chip are used for burst pulses control,

automatic frequency control, automatic gain control, as well as battery and temperature

monitoring.

The power management unit of the GSM phone is also built in the ABB chip,

which contains 5 LDOs, one of which controls the power supply to some key

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 11 of 11

I360 Mobile Phone Maintenance Manual v0.1

sub-modules (the SIM converter, SIM voltage converter for 3V-5V logic signals).There

are also some improvements in the control of recharging power increasing and of the

recharging progression.

2.3 GSM Processor

2.3.1 Mcu Chip

The enhanced GSM processor is a highly integrated core element in the

GSM chipset. The GSM processor features all base-band functions of the layer

1 protocols, including:

A. Complete Single Chip GSM Processor

B. Channel Codec Subsystem

a. Channel Coder/decoder

b. Interleaving/de-interleaving

c. Encryption/decryption

d. Control processor

d. 32-bit microcontroller(ARM7TDMI)

C. Serial and parallel display interfaces

D. Keyboard interface

E. EPROM interface

F. SIM interface

G. ABB interface

H. Wireless control subsystem

I. Programmable backlight

J. Real-time clock with alarming function

K. DSP subsystem

a. 16-bit solid-state coding

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 12 of 12

I360 Mobile Phone Maintenance Manual v0.1

b. Full-speed voice coding/decoding

b. Enhanced full-speed voice coding/decoding

d. 16-state Viterbi equalizer (soft decision)

e. Dual-tone multiple frequency and call progression voice producer

L. Wireless transmission power management

M. Delayed clock for low current standby state

N. Ultra-low power design

O. 14.4Kbps on-chip GSM data processing

P. JTAG testing interface

Q. 1.5V operation voltage

R. 179-pin BGA package

S. Voice baseband Codec and A/D interface

2.3.2 ABB chip

A. Power Voltage: 1.5V--3.3V

B. Input frequency of system clock: 13MHz

C. Ambient temperature: -40--85℃

D. Complete interfaces:

a. A/D interfaces for voice I/O

b. A/D interfaces for baseband I/O

c. A/D interfaces for auxiliary/control signals

E. Voice Codec

a. Complete linear Codec

b. Dual-channel 15-bit A/D converter with filters

c. Dedicated buzzer output

d. Programmable I/O gain

e. Serial audio interface

F. Baseband Codec

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 13 of 13

I360 Mobile Phone Maintenance Manual v0.1

a. Differential I, Q I/O

b. Burst pulse storage on chip

c. GMSK modulator

d. 2 10-bit D/A converters

d. 2 15-bit A/D converters

f. Limited pulse response filter on chip

g. Serial baseband interface

G. Auxiliary components

a. Support for automatic gain control, automatic frequency control and power slope

control

b. 10-bit automatic gain control D/A converter

c. 13-bit automatic frequency control D/A converter

d. 10-bit slop D/A converter with a 4x repeater

e. On-chip slop random memory

f. 4 channel 10-bit A/D converter

g. Serial auxiliary interface

h. Charger interface

i. 3V/5V SIM interface

j. Power management module

H. 100 Ball BGA package

3. Disassembly

The disassembly of bar phone I360 is relatively complicated. To avoid

internal elements and the housing damage when disassembling or assembling

again, the service operations should be performed with great caution. Safe

grounding should be guaranteed. When maintaining these elements, high

resistance anti-static bracelets must be used to prevent possible damage caused

by static electricity.

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 14 of 14

I360 Mobile Phone Maintenance Manual v0.1

Attention Most of the circuit elements of this device are prone to static

damage. When operating, transporting the device or maintaining the

internal elements, measures should be taken against static electricity.

3.1 Recommended tools

The following tools are recommended for disassembling or assembling the

mobile phone (or similar tools with the same functionality can be utilized).

a. Anti-static pad (including the grounding lead)

b. Anti-static bracelets

c. Rotary screw driver (Type T5，with a torque of 0.15Nm）

d. Ф1.4mm cross screw driver

e. Nipper

f. Chock gauge（100mm in length）,type: 0.02mm-1.00mm (the mesne thickness

is 0.4mm )

g. Digital multimeter

h. Oscilloscope

i. Electric soldering iron

j. Heat gun

j. Communications system analyzer

3.2 Disassembling Steps

The steps for assembling components of the mobile phone are described

as below. Disassembling can be done with the reversed steps.

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 15 of 15

I360 Mobile Phone Maintenance Manual v0.1

4 I360 Assembly Steps

Fig. 4-1 I360 assembly process

5 Troubleshooting

5.1 Block Diagram of Troubleshooting

Fault description by the user

Search for

solution from the

list given below

ause

hardware

own

again

following the

steps give

elow

ause

software

Explain to the

use

Diagnosis

Notice: A brand new problem has to be solved based on the technician’s experience. The troubleshooting

list given below contains the known faults of I360, which is for Level 1 service reference.

5.1.1 Chips and elements inside the mobile phone are driven by weak currents, so the maintenance

should not be performed within a magnetic field or with high voltage to avoid possible

damage caused by heavy current.

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 16 of 16

I360 Mobile Phone Maintenance Manual v0.1

5.1.2

When troubleshooting the mobile phone, follow the general operation rules. Firstly

the measurement meters should be correctly connected. Then turn on and properly configure

the meter. The type of the fault should be firstly determined as well as the possible extension

of the fault.

5.1.3

The mobile phone is an integrated microelectronics product with delicate elements

inside, so the service technician should get familiar with the chips/elements and their

specifications before any troubleshooting operation, with the logic between the chips clear in

mind. During the troubleshooting, circuit analysis, careful inspection, correct judgment, as

well as quick and accurate operation are required to prevent any man-made malfunction and

economic loss. Repair operations should be performed after the type of the fault has been

confirmed.

5.1.4

Final Testing or Calling on Trial

Final testing or calling on trial are performed to check whether the mobile phone can

operate normally again.

5.2 Problem Identification and Maintenance

The I360 phone includes mainly a motherboard and a keypad board.When

troubleshooting the phone, check the connection between the LCD and the keypad board.

5.2.1 Block Diagram and Modules Description

5.2.1.1 Block Diagram

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 17 of 17

I360 Mobile Phone Maintenance Manual v0.1

DBB

ABB

MEMORY

JPEG

CAMERA

LCM

SIM

BATTERY

KEYBOARD

MIC

SPEAKER

EARPHONE

MIDI&

MP3

VIBRATOR

RECEIVE

5.2.1.2 Modules Description

Power supply: The upper part shows ABB’s direct output, and the lower part shows the output voltage

from the LDO. Once the phone is turned on, the LDO output should be valid. If there is no output, check

the LDO’s input and the shutdown control (which should be “1”).

V-DBB 1.5V TO DIGITAL CORE

V-FLASH 2.8V TO MEMORY

V-SRAM 2.8V TO MEMORY

V-IO 2.8V TO Peripherals

V-ABB 2.8V TO Analog Part

VBAT 3.5---4.2V Battery Voltage

Note: VBAT is connected directly with the battery, providing power supply to the phone

components via L301 (filter induce). The network name is VBA.

U336_5 pin 3.3V TO MIDI PA

U334_5 pin 1.8V TO MIDI

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 18 of 18

I360 Mobile Phone Maintenance Manual v0.1

U335_5pin 2.8V TO LCD,JPEG,MIDI

U318_4pin/ U318_6pin 2.8V/1.8V TO Camera Connector

VCHG (J305_3,4pin) 5.00~5.50V

Voltage from recharger to

the phone

U320 About 6.2V LCD Backlight Voltage(2

lights)

Connectors (both internal and external)

J305

18pin＋4pin connector, external

Recharging, download and

battery connection

J306

Earphone jack, external Earphone for receiving

calls or listening to MP3

music

J301

SIM slot, external For SIM connection

J304

MIC connector, internal For MIC connection

J320

Camera connector, internal For camera connection,

20pinB-B

J332

Motor connector, internal For motor connection

J308

Speaker connector, internal For speaker connection

Receiver

Receiver connector, internal

For receiver connection

J300

LCD connector, internal For LCD connection

Display (LCD and camera)

The display module primarily includes the JPEG chip (U301), LCD displayer, camera, and LCD backlight

driver (U320).

The clock signal (13MHz, 2.8V) of JPEG is provided by DBB.

The voltage of LCD is 2.8V, provided by pins 28,29,30 of J300. The data and control signals are provided

by the JPEG chip to the LCD, which includes data, chip-select and read/write pins.

Camera data signals are connected with the JPEG chip, including I2C, field synch and YUV. The power

supply is provided by U318. Pins 1 and 3 (control) of LDO are controlled by JPEG. When the camera is

not used, there is no output for LDO, and pin 1 is “0”.

Storage (composed of combFlash)

combFlash(U331) consists of 128Mb Flash and 32Mb SRAM, which are both connected directly with

DBB.

Music (consisting of MIDI, MP3 chip and peripheral circuits)

U333 (VC0938D)

provides MIDI and MP3 features. The Speaker signal is output directly by VC0938D

(with built-in mono audio PA)

，and the earphone can be used for playing MP3 music and receiving calls,

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 19 of 19

I360 Mobile Phone Maintenance Manual v0.1

so there is an analog switch U300.

5.2.2 Baseband troubleshooting

The possible symptoms and corresponding solutions of I360 are listed in the table below

for reference.

Entry

Symptoms Possible causes Solution or maintenance steps

The voltage between the

positive and negative

connectors of the battery is

0.4—0.6V when the battery

is removed.

1、Use the nipper to short-circuit the

positive and negative connectors.

Then check whether the voltage

has turned to be 0V.

2、 If the phone still cannot be turned

on, remove the battery. After about

ten minutes, install the battery

and try to turn on the phone.

The battery is not correctly

installed.

Install the battery again. Make sure

the clamp functions correctly.

The battery is low(less than

3.4V)

Recharge the battery for about 20

minutes, and then check the phone

display which should indicates the

battery level.

If there is battery level indication,

press the Power key for about 2

seconds to see whether the phone

functions normally.

Battery connectors are of

poor elasticity.

Replace the battery connector J305.

The phone cannot

be turned on.

Power key malfunction Check the mechanical part of the

Power key and check the switch.

Breakdown

Error in program running. Remove and reinstall the battery, and

make sure the clamp functions

properly. Then power on the phone

again.

Date and time are

reset.

There is no backup battery in

the phone.

Please set up date and time after the

battery is reinstalled.

The alarm clock

(agenda) cannot

be set up

Menu options are not

properly configured.

See the part on Settings menus in your

user’s manual.

The LCD connector is not

ell connected with the

FPC.

Reinstall it again.

Nothing

displayed on the

LCD.

Or the LCD is

acklighted, but

Check the soldering of FPC

connector J300.

Check for possible pseudo soldering

or bridging

LENOVO Lenovo Mobile Telecommunications Co., Ltd.（OPEN DOC） Page 20 of 20

Page is loading ...

Lenovo I360 Maintenance Manual

Lenovo I360 Maintenance Manual

Lenovo I360 Maintenance Manual

Related papers

Other documents