Prestigio PSP3502 Service Manual
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Prestigio PSP3502 Service Manual

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SERVICE MANUAL
For Cellular Phone
Model Name: PSP3502

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Summary of Contents for Prestigio PSP3502

  • Page 1   SERVICE MANUAL For Cellular Phone Model Name: PSP3502...
  • Page 2         Version: Effective Date: 2014.04.27...
  • Page 3   Note This manual is guide to after-sales repair of DA34681 mobile phone, the repair of product shall only be carried out by trained and well experienced technical person and use of this manual by any other person for the service of the product may result in serious damage to the product...

  • Page 4: Table Of Contents

      Content 1. Introduction 1.1 Purpose 1.2 General safety Guidelines and use 2. General Characters 2.1 Overview 2.2 Introduction to main Functions 3. Introduction to capability and index 4. How the GSM system work 4.1 General 4.2 Introduction of GSM 5.

  • Page 5: Introduction

      9. RF Trouble 9.1 Principle of operation 9.2 AGC failure 9.3 AFC failure 9.4 APC Failure 10. Maintenance tools 1. Introduction: 1.1 Purpose: The main purpose of this manual is to provide a basic foundation for electrical and mechanical repairs 1.2 General Safety guidelines and use: Safety guidelines: The product contains polar capacitors, which must not be short-circuited or...

  • Page 6: Introduction To Capability And Index

      Antenna: GSM antenna, FM earphone antenna, BT/WiFi/GPS antenna Charger: Micro USB charger SIM: dual band and dual standby Support MSN, Yahoo, Message, face book, ect 3. Introduction to capability and index: Operating temperature: -10℃ ~ +55℃ Storage temperature: -10 ℃ ~ +60℃ Relative humidity: ~ 95% Transmit power:...
  • Page 7   Output powers of transmitters of different power levels (GSM900) Power Control Output Power Error level of transmitter Normal(dB) Limit(dB) 5 33 ±3 ±4 6 31 ±3 ±4 7 29 ±3 ±4 8 27 ±3 ±4 9 25 ±3 ±4 10 23 ±3 ±4...
  • Page 8   Output powers of transmitters of different power levels (DCS1800) Power Control Output Power Error level of transmitter Normal(dB) Limit(dB) 0 30 ±3 ±4 1 28 ±3 ±4 2 26 ±3 ±4 3 24 ±3 ±4 4 22 ±3 ±4 5 20 ±3 ±4...

  • Page 9: How The Gsm System Work

      15 0 ±5 ±6 4. How the GSM system work: 4.1 General: The following is a basic introduction to the GSM (Global system for mobile communication) cellular network. This introduction has been greatly simplified and cannot describe all the working performances and technologies or technologies used by the system.
  • Page 10   For example, assuming that cell A works in channels 1~8(Numbering is arbitrary), cell B works in channels 9~16 and cell C works in channels 17~24, cell D can works in channels 1~8(reusing the channels used by cell A). In this system, subscribers in cells A and D can use channels 1~8 at the same time.

  • Page 11: System Overview

      made, the system allocates a dedicated time slot from each TDMA frame, and, after digitalization, the subscriber data(voice/data) is broken up into blocks. The subscriber data blocks are sent in the allocated slots of each TDMA frame in the form of an information pulse. Utilize Gaussian Minimum Shift keying(GMSK) --- a highly efficient method of phase modulation, to modulate the data blocks into the carrier.

  • Page 12: Rf Part

      RF part : RX SA W : U1 103 ;   DPX:U1104/U1105/U11 VBAT 06/U1207 U1202 RF Connector U1101 RF Transceiver 26MHz U1201 Ante nna Switch + GSM PA; U1203/U 1204/U1206 U1102 26MHz /U1206 WCDMA PA Crystal RF (Radio Frequency) section is composed of 26MHz crystal, RF main chip, Saw filter, RF connector, Antenna Switch, RF Amplifier 26MHz Crystal circuit: Mainly comprised of U1102 (Output frequency 26MHz and ±10ppm accuracy) and related RC components.

  • Page 13: Bb Part

      LNA, PGA, Amplifier, GMSK modem (GMSK modem exclude from RF chip), PLL etc. RF Amplifier circuit U1201: The periphery of U1101 mainly includes resistance, capacitor and inductance components. U1201 is directly powered by batteries. BB Parts: Include analog baseband chip, Flash, audio, keys, SIM Card slot, battery connector, micro USB connector (5pin), charger circuit etc.
  • Page 14   Back view Instruction of disassembly: Tool for repair: Tweezers, case removing tool, standard cross head screwdriver...
  • Page 15   Disassem bly Steps: Removing the battery : Push the battery cover in the direction of the red arrow, and take the battery cover off, and take the battery off.

  • Page 16: Repair Requirement

      Removing the upper house: Unscrew the 10 screws fixed on lower housing, the position of screws shown as red circles of the following picture, and according to the order of A--->B--->C--->D--->E--->F--->G--->H--->I--->J:   B  B  F  F  G  G    J ...

  • Page 17: Baseband Trouble

      8. Baseband Trouble 8.1 Flash programming does not download Analysis Process： 8.2 Phone does not “power on” Power on principle of phone: When the power supply is connected with the phone, through internal switching circuit in the boot it will form a trigger High-level, when press boot button long enough, the boot high-level change to low-level because of connecting with GND, and the signal reaches PMU block, PMU will activate the internal voltage regulator and output stable voltage, as a logical part of the...
  • Page 18   MHz clock signal, on the one hand it will be taken as a RF reference clock, on the other hand, it will be sent to logic to the clock signal. After the clock signal reaches the microprocessor, the memory before need be cleared, therefore PMU will send reset signal to it for initialization.

  • Page 19: Sound Trouble

      8.3 Sound trouble Analysis Process： Reference circuit as follows：   8.4 Can not charge up Charging principle introduction: The battery charger is optimized for the Li-ion batteries. The typical...
  • Page 20   charging procedure can be divided into three phases: pre-charging, constant current mode charging, and constant voltage mode charging. Follow figure shows the flow chart of the charging procedure. Most of the charger circuits are integrated in the PMU except for one PNP transistor, one NMOS and one accurate resistor for current sensing.
  • Page 21   Reference circuit as follows：...

  • Page 22: Lcd Trouble

      8.5 LCD trouble LCD backlight driver circuit: BL chip LCM part...

  • Page 23: Microphone Trouble

      Analysis Process： 8.6 Microphone trouble Reference circuit as follows：          ...

  • Page 24: Earphone Part Trouble

      Analysis Process： 8.7 Earphone part trouble Earphone Circuit Working Principle： 1、Bias voltage：MICBIASP（1.9V）. 2、Headphone detection signal: EINT4_HP: When insert earphone, due to EINT4_HP connection with MP3_OUTL ， EINT4_HP will be pull down， Trigger interrupt to the CPU，Will show "Insert headphone". 3、...
  • Page 25   Analysis Process ：...

  • Page 26: Vibrator Trouble

      8.8 Vibrator trouble Reference circuit as follows： Analysis Process： 8.9 Receiver does not work Reference circuit as follows：...

  • Page 27: Camera Trouble

      Analysis Process： 8.10 Camera trouble Reference circuit as follows：...

  • Page 28: Main Camera

      Main camera     Sub camera...
  • Page 29   Analysis Process： 8.11 WIFI、FM and BT an GPS circuit trouble Reference circuit as follows：...
  • Page 30  ...
  • Page 31   WIFI Analysis Process： FM Analysis Process：...
  • Page 32   BT Analysis Process： GPS Analysis Process...
  • Page 33   8.12 G-sensor has not function Reference circuit as follows： Analysis Process： 8.13 Phone can not access SIM card SIM Circuit Working Principle： SIM cards signal Description: 　 SIM_IO: data signals; 　...
  • Page 34   SIM_RST: SIM card reset signal; 　 SIM_CLK: SIM card clock signal; 　 VSIM: SIM card power supply; Boot process, VSIM power supply through the SIM card I / O port from the CPU detection SIM card, such as card not detected, the software will soon be closed VSIM.
  • Page 35   Analysis Process： 8.14 TF card trouble TF card Circuit Working Principle Multi-media card primarily is used to expand data storage capacity, relatively simple interface circuits, including power signals, clock signals and data signals. Repair inspection contact pin of the welding, and the existence of foot subsidence;...

  • Page 36: Rf Trouble

      Analysis Process： 9. RF Trouble 9.1 Principle of operation： Signal TX processes: Acquisition voice - Amplification - ADC - filter - Speech Code - Complect - encryption – Channel Equalization - GMSK modulation -- ( into RF part) IQ modulation (IQ modulator) - filter –...

  • Page 37: Agc Failure

      9.2 AGC failure Analysis Process ：...

  • Page 38: Afc Failure

      9.3 AFC failure Analysis Process :...

  • Page 39: Apc Failure

      9.4 APC Failure Analysis Process： 10. Maintenance tools ● RF Test Apparatus Agilent 8960 or CMU200 ● Oscilloscope ● DC Power Supply ● MultiMate ● Iron ● Hot wind gun ● RF test cable ● USB downloads cable ● Screwdriver ●...

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