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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