FLY DS186 Bedienungs- und Wartungsanleitung

DS186_Maintenance

Instruction

Prepared by：xiaoyu wan

Approved by：

Date：2010.9.25

TABLE OF CONTENTS

1 Overview DS186

1.1 About DS186 Phone

1.2 Distribution of the mainboard components

2 RF

2.1 RF Overview

2.2 Transmit

2.3 Receive

2.4 Common RF Malfunction

3 Baseband

3.1 Baseband Overview

3.2 Logic

3.3 Power management

3.4 Baseband common malfunction

4 Reference for maintenance

4.1 No power on

4.2 Shut off automatically

4.3 Dead halt

4.4 No charge

4.5 Quantity of electricity faulty detection

4.6 No display

4.7 LED NG (on the LCD)

4.8 LED NG (on the keyboard)

4.9 Key NG

4.10 No ring

4.11 No receiving voice

4.12 No sending voice or voice is small

4.13 No vibration

4.14 SIM card inefficacy

4.15 TF card inefficacy

4.16 Camera inefficacy

4.17 Bluetooth inefficacy

4.18 Earphone inefficacy

4.19 FM inefficacy

1 Overview DS186

1.1 About DS186 Phone

DS186 mainboard is based on the MTK platform designed to support 2-

band which supporting the FM and Bluetooth calls and transmission, the

mainboard system consists of the base-band （CPU：

MT6253+TY6701111184KC）and the RF (MT6253+SKY77518).

Flash

CPU

Audio PA

BT area

RF PA

LED Driver

FM

LCD

K/B FPC

MT6253

MT6612

TY6701111184KC

SKY77518 RDA5802ES

1.2 Distribution of the mainboard components

Antenna

Socket of SIM card

and TF card

Battery CONN

Earphone CONN

Adapter CONN

Camera FPC

2 RF

2.1 RF Overview

RF part mainly consists of transceiver MT6253 (adopts program of near-zero IF

receiver, supporting the EGSM / DCS and 26M VCTCXO as the clock input,

integrated clock buffer, LO VCO and TX VCO and regulator, only need for

external connections of VBAT / AVDD), SKY77518 (it supports EGSM / DCS

and integrated automatic power control and transceiver switch).

Transceiver (MT6253) with the RF modulation and demodulation functions

contains IF frequency synthesizer and VCO RF, which is part of the core

component of the RF. PA has a major role in amplification of modulation

signal, and it must be controllable and the speed should meet the GSM

agreement.

2.2 Transmit

TX is composed of the modulation loop, power amplifier and antenna

switch. PLL is mainly in the internal MT6253, I / Q signal first

enters into the MT6253, after entering the PLL the signal is

modulated to RF, and then it outputs from the chip to PA, converts

into electromagnetic energy through antenna by the antenna

switch after enlarged.

PA:

This part adopts voltage control to achieve and its role is to amplify

the signal power in accordance with the requirements. It is divided

to two different power levels through VRAMP signal. The transmit

signal of GSM is 5 to 19, power is from 3.2MW to 2W while DCS is

0 ~ 15, power from 1MW ~ 1W. PA is time-sharing work controlled

by TX-EN chip, the output power of PA is controlled by VRAMP

(APC) through the voltage. PA is intermittent work, by the BS to

achieve the choice of frequency bands.

2.3 Receive

Antenna RX - MT6253 (RX_VCO mixer) - band-pass - Amplification -

filter - Amplification - RX_VCO mixer - CPU

2.4 Common RF Malfunction

Detection and Maintenance Flow Chart of MS Transmit malfunctio

3 Baseband

3.1 Baseband Overview

DS186 Baseband consists of CPU MT6253 and Program Memory. MT6253

baseband, the core device of the mainboard, is responsible for the normal work

among various parts of mainboard, such as voice processing, image processing,

power management as well as MS communications.

MT6253 digital baseband contains ARM7EJ-S 32-bit core and 144Kbyte SRAM.

MT6253 which is an enhanced GSM Processor integrated Channel Codec

subsystems interiorly including Channel Codec, Intertlace / Deinterleave,

Encryption / Decryption and Control Processor subsystems including ARM7EJ-S

and its peripheral circuits. There are 25 address lines,16 data lines, 8 chip select

lines, provided 7 external interrupt Interface, 52M/104M operation clock.

Analog baseband contains MT6253 analog baseband chip, audio, baseband

codec and power management. Four major functional blocks integrated internal:

Audio codec including Voice input / Output channel, Buzzer output; Baseband

codec including Differential I, Q input / output, GMSK modulation and A / D, D / A;

Auxiliary parts including AFC DAC, RAMP DAC, AGC DAC and a seven-channel

A / D. And WATCHDOG interface is set internal to enhance the stability of the

system.

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