Blu STUDIO 5.0S II Manuale utente

STUDIO 5.0S II SERVICE GUIDE

1. INTODUCTION

1.1 Compile Objective

This document“STUDIO 5.0S II Working Service Guide_V1.0”is the maintenance

work guide for STUDIO 5.0S II. The compile objective is to describe the detail theory of

STUDIO 5.0S II and to offer a maintenance guide for the later mass production and after

service.

The readers of the document should be the debug worker of SMT and after-service. It

will be the work guide for them. At the same time, the other members of the STUDIO 5.0S

II project group can also refer to the documents.

1.2 Project Background

STUDIO 5.0S II is a WCDMA systems project designed by us, according to the marketing

evaluation, baseband on a platform from MTK.

Project name: STUDIO 5.0S II

Project presenter: BLU Products

Project undertaker: STUDIO 5.0S

1.2.1 STUDIO 5.0S II Summary

STUDIO 5.0S II Supports the four 2G band class frequency: GSM850/900/1800/1900Mhz

and two 3G band class frequency 850 or 1900 or 2100, MP3, MPEG4, U storage, USB

charger, video record and play, Bluetooth, WIFI, and so on.

1.3 STUDIO 5.0S II Component Layout

1. Assembly components on TOP layer as follow：

2. Assembly components on Bottom layer as follow：

1.4 STUDIO 5.0S II Hardware Diagram

The HW Diagram as follow：

1.5 STUDIO 5.0S II Main Components

1.5.1 Mainboard

1 U101 - MT6582 CPU

2 U301 - MT6323

3 U401 - H9TP32A8JDACPR-KGM or H9TP32A8JDBCPR-KGM Memory

4 U501 - SKY77590 RF PA

5 U502 - MT6166 Transceiver

6 U503 - RF7241 WCDMA BAND1 PA or RF7242 WCDMA BAND2 PA

7 U504 - RF7248 WCDMA BAND8 PA or RF7245 WCDMA BAND5 PA

8 U601 - MT6627 WIFI BT GPS and FM 4 in 1 chip

9 U801 - BMA222E G_SENSOR

2. RF PARTS

Basic diagram:

The RF part of STUDIO 5.0S II consists of a transceiver (MT6166), GSM PA

(RF3232) ASM a WCDMA PA (RF7241/2/5/8) and an ASM.

1 The receiver circuit will receive the high frequency signal from the antenna, select out the

necessary signals and demodulate them into I/Q signals, transmit them to the BB (MT6582).

2 The transmit circuit will modulate the I/Q signals from the BB to pointed frequency,

amplify its power, and then transmit it to the antenna.

2.1 TX Part

2.1.1 TX Circuit

The modulation circuit is composed of PA and ASM. The PLL circuit is mainly

built in the MT6166. At first, the I/Q signals come into the MT6166 and then are

modulated into RF signals after going through the PLL circuit. The RF signals are sent out

to the PA RF7241/RF7242/RF7245/RF7248 (3G) or SKY77590 (2G). After sent into the

PA, the signals are amplified and transmitted as the electromagnetic wave by the antenna

after passing through the ASM between the MT6166 and RF7241/RF7242/RF7245/RF7248,

There are some circuits used as attenuation circuit, And the ASM (SKY77590 inside) do

the selects of RX TX.

2.2 RX Circuit

At first, the GSM signals received by the antenna will go through the front model

SAW filter to the MT6166. They are amplified, mixed and modulated into the I/Q carried

by the 100KHz wave, done by the band pass filter, amplifier (controlled gain), filter,

amplifier(controlled gain) and mixer. Then the 4 tracks of I/Q signals are putout the

transiver and sent to the MT6166

The FEM is the ASM, a select switch of RX and TX, GSM and DCS. By this way, the

isolation will be well strengthened and signals will be well protected.

2.3 RF Part examine and Repair -TX

2.3.1 Necessary condition

a. Test condition1：voltage=3.8V-4.2V

b. Test condition 2：GSM Band

TX mode CH62 Freq=902.4MHz Power Level：5

c. Test condition3：DCS Band

TX mode CH700 Freq=1747.4MHz Power Level：0

c. Test Instrument：CMU200,Oscillograph, spectrum analyzer

d. Examination of the TX

Make the mainboard into the transmit states by using the special software. In the GSM

band, select the 62nd channel, 5th power level. In the DCS band, select the 699th channel, 0

power level. Then observe whether the current will raise and check the wave by using the

spectrum analyzer or the oscillograph.

a. The wave I/Q at transmit state as below.

b.

c. If the PA_EN,VRAMP and TX input are all in the correct states and the TX output is

abnormal ,you can know there are something wrong with the SKY77590

d.

3. BASEBAND PARTS

STUDIO 5.0S II’s baseband is composed of MT6582 .The MT6582 is the core chipset with

responsibility for the audio, communication and the control of all parts of the system.

The digital baseband in MT6582 is the strengthen GSM processor with integrated channel

encoder/decoder, complex/de –complex, encrypt/decrypt and other subsystems of

coder/decoder.

The analog parts mainly include the analog part of the MT6582, audio part of MT6582 and

the coder/decoder in it.The analog part of the chipset integrate three function modules; two

separates audio input/output channel, the audio decoder for buzzer the differential I/Q input

/output, GMSK modulator, and A/D D/A coder/decoder.

Besides these, they also include the parts of AFC/ DAC/ RAMP DAC/AGC DAC/and a

auxiliary four channels A/D converter. And also, an integrated watch dog interface in used

to enhance the stabilization of the system.

The MT6323 include a power management function most of the power supply of the

system is made by its integrated 25 LDOs .And the chipset also has the function of

management of the charge.

Power Management

The power management part is composed of the PMU chipset and the periphery charging

circuit the logic level translation of SIM card and the reset signal of the system are all made

by the PMU. The output of the LDO integrated in the chipset as below:

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