Pantech G800 Service Manual
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Pantech G800 Service Manual

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G800 Service Manual
G800
G800 Service Manual
(GSM Cellular Phone)
Pantech Co., Ltd., Korea
January 23, 2004
st
1
Edition
For Use by Authorized Service/Maintenance Personal Only
Documents to Receive This Addendum:
G800 Maintenance/Repair/Operating Manual

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  • Page 1 G800 Service Manual G800 G800 Service Manual (GSM Cellular Phone) Pantech Co., Ltd., Korea January 23, 2004 Edition For Use by Authorized Service/Maintenance Personal Only Documents to Receive This Addendum: G800 Maintenance/Repair/Operating Manual...

  • Page 2: Table Of Contents

    G800 Service Manual CONTENTS ....................3 ECTION NTRODUCTION 1.1 I ..........................3 NTRODUCTION 1.2 F ..................4 REQUENCY LLOCATION AND 1.3 I ........................4 AME AND 1.4 C ........................5 HARACTERISTICS ................6 ECTION LECTRICAL PECIFICATIONS 2.1 G ............................ 6 ENERAL 2.2 T...
  • Page 3 G800 Service Manual 6.2.5 HOOK S ....................35 WITCH ORKING 6.2.6 M ......................35 ELODY INGING 6.2.7 V ......................37 IBRATOR ORKING 6.3 SIM CARD P ........................38 6.3.1 SIM E ........................... 38 RROR 6.4 C ......................... 39 HARGER 6.4.1 C .........................

  • Page 4: Section 1 Introduction

    G800 Service Manual SECTION 1. Introduction 1.1. An Introduction of GSM Digital Cellular Mobile Communication System GSM (Global System for Mobile communication) concluded that digital technology working in the Time Division Multiple Access (TDMA) mode would provide the optimum solution for the future system.

  • Page 5: Frequency Allocation And Its Use

    ** Fl(n)= frequency value of the carrier , Fu(n)= corresponding frequency value in upper band 1.3. Item Name and Usage G800, GSM digital cell phone, is supercompact, superlight mobile communication terminal for personal use. It has a 900MHz, 1800MHz, and 1900MHz frequency band and adopts GSM, DCS, and PCS mode having excellent spectrum efficiency, economy, and portability.

  • Page 6: Characteristics

    2) Surface mounting device (SMD) is used to ensure high reliability, compactness and lightness. 3) G800 adopts the Silabs’s AERO I RF transceiver, which is CMOS RF front-end for multi-band GSM digital cellular handsets. The AERO I's highly-integrated architecture eliminates the IF SAW filter, low noise...

  • Page 7: Section 2 Electrical Specifications

    G800 Service Manual SECTION 2. Electrical Specifications 2.1. General E-GSM / DCS / PCS Band 880 MHz ~ 915 MHz / 1710 MHz ~1785 MHz / 1850MHz ~ Mobile Transmit Frequency 1910MHz 925 MHz ~ 960 MHz / 1805 MHz ~ 1880 MHz / 1930MHz...

  • Page 8: Receiver

    G800 Service Manual 2.3. Receiver Reference Sensitivity For GSM900 small MS :-102dBm For DCS1800 / PCS1900 class3 MS : -102dBm C/Ic For Adjacent interference 9 dB For Adjacent(200KHz) interference C/Ia1 -9 dB For Adjacent(400KHz) interference C/Ia2 -41 dB For Adjacent(600KHz) interference...

  • Page 9: Section 3 Operation

    G800 Service Manual SECTION 3 Operation 3.1. Name of each part Antenna Sub LCD Flash LED Camera Speaker& Earpiece Display Screen Navigation Camera Key Volume up key Bluetooth key Volume down key - 8 - PANTECH R&D CONFIDENTIAL...

  • Page 10: Display

    G800 Service Manual 3.2. Display(Dual LCD) Parameter Projected Actual(MAIN LCD) Display Color TFT LCD with white LED back lighting 262144 colors European Character : (font size : 16×16) 6 lines x 16 characters Chinese Character : (font size : 16×16) 6 lines × 7 characters...

  • Page 11: Section 4 Theory Of Operation

    G800 Service Manual SECTION 4. Theory of Operation 4.1. Logic Section 4.1.1 DC Distribution and Regulation Part Applying battery voltage and pressing “END” key on the key pad short-circuits “Ground” and “_ PowerON”.ADP3522(U103)control that power manage regarding power on/off in handset Pressing POWERKEY on the key pad is active on the handset.
  • Page 12 G800 Service Manual AD6526 has a built-in ARM7 microprocessor core, including microprocessor interrupt controller, timer/counter, and DMA controller. And besides, 32bit data path is included, and up to 8Mbyte addressing is enabled and can be extended up to 16Mbyte. Although external clock should be provided to operate the microprocessor, this core uses 13MHz VCTCXO to provide clock.

  • Page 13: Memory Part

    G800 Service Manual 5 General Purpose ADC Support The AD6521 includes a general purpose 10bit auxiliary ADC with four multiplexed input channel These are used for measurment of battery voltage ID , temperature and accessory ID. 6 USC(Universal System Connector) Interface A Typical GSM handset requires serial connections to provide data during normal phone operation manufacturing,testing and debugging.

  • Page 14: Key Pad Part

    G800 Service Manual Vibrator: This is a device enabling vibration. The vibrator data is stored in flash memory(U104) And generated by U101.C5(GPO_23)pin. 4.1.5 Key Pad Part To enable key operation to input information, the key matrix is configured using strobe signal of KEYPADROW(0-4) and 5 input ports of KEYPADCOL(0-4).

  • Page 15: Radio Transceiver Section

    4.2. Radio Transceiver Section Fig.4-1. RF Transceiver block diagram The G800’s RF Transceiver(U710), which is AERO I, consists of the GSM transmitter,the GSM Receiver, and the RF synthesizer. The highly integrated solution eliminates the IF SAW filter, external low noise amplifiers (LNAs) for three bands, transmit and RF voltage controlled oscillator (VCO) modules, and more than 60 other discrete components found in conventional designs.

  • Page 16: Dc Distribution And Regulation Part

    G800 Service Manual Fig.4-2. Top view of RF Transceiver PCB Layout 4.2.1 DC Distribution and Regulation Part The battery voltage, in return, is applied to the logic part and RF part via LDO(Low Drop-Out) regulator. As several LDO regulators are used, power can be supplied for each necessary part efficiently. Audio/Logic parts use +2.8V.

  • Page 17: Receive Section

    4.2.3.1 An Overview of Receive section Fig.4-6. Receiver block diagram G800’s Aero I transceiver uses a low-IF receiver architecture which allows for the on-chip integration of the channel selection filters, eliminating the external RF image reject filters and the IF...
  • Page 18 1800 (1805–1880 MHz) band. The PCS input supports the PCS 1900 (1930–1990 MHz) band. G800 use all the input ports that are GSM, DCS and PCS inputs. The LNA inputs are matched to the 150 Ω balancedoutput SAW filters through external LC matching networks.
  • Page 19 G800 Service Manual that is 897.5MHz ±17.5MHz for EGSM bands, 1747.4±37.4 MHz for DCS bnads, and 1880.2 ±30 MHz for PCS bands from the power amplifier and transmits it to the antenna. The maximum insertion loss is about 0.8 dB for the receiving bands at 25 C and about 1.35 dB for the transmitting bands at 25...

  • Page 20: Transmit Section

    G800 Service Manual 4.2.4 Transmit Section 4.2.4.1 An Overview of Transmit Section Fig.4-8. Transmitter block diagram The transmit (TX) section consists of an I/Q baseband upconverter, an offset phase-locked loop (OPLL) and two output buffers that can drive external power amplifiers (U701), one for the GSM 850 (824 to 849 MHz) and E-GSM 900 (880 to 915 MHz) bands and one for the DCS 1800 (1710 to 1785 MHz) and PCS 1900 (1850 to 1910 MHz) bands.

  • Page 21: Transmitter Part

    G800 Service Manual Low-pass filters before the OPLL phase detector reduce the harmonic content of the quadrature modulator and feedback mixer outputs. The cutoff frequency of the filters is programmable. 4.2.4.2 Transmitter Part A. 6 dB attenuator : Z705, Z706 These passive components are adopted for PAM to operate in a stable output power.

  • Page 22: Offset Pll

    G800 Service Manual 4.2.5 Offset PLL 4.2.5.1 An Overview of Offset PLL Fig.4-10. Si4205 Frequency Synthesizer Block Diagram The Aero I transceiver integrates two complete PLLs including VCOs, varactors, resonators, loop filters, reference and VCO dividers, and phase detectors. The RF PLL uses two multiplexed VCOs.

  • Page 23: Vc-Tcxo(Voltage Controlled Temperature Compensated Crystal Oscillator): V801

    G800 Service Manual 4.2.5.2 VC-TCXO(Voltage Controlled Temperature Compensated Crystal Oscillator): V801 This is the mobile station’s reference frequency source. Its frequency is 13MHz, this signal is applied to Si4205(U710)_pin8, AD6526(U101) and YMU765(U105). VCTCXO Fig.4-11. Top view of VCTCXO part on the PCB artwork...

  • Page 24: Section 5 Alignment Procedure

    G800 Service Manual SECTION 5. Alignment Procedure 5.1. Recommended Test Equipment Model Description Maker Remark GSM Mobile Station Agilent 8960 Test Set Technologies 8593E Spectrum Analyzer Hewlett Packard Oscilloscope Tektronix 340A FLUKE Digital Multimeter Fluke E3630 DC Power Supply Hewlett Packard...

  • Page 25: Section 6 Equipment Repair Procedure

    G800 Service Manual SECTION 6. Equipment Repair Procedure 6.1. No Power On with battery Applied. 6.1.1 Power CHECK 1.Check battery power : 3.5V~4.2V. BATTERY PACK Terminal 2.Check to see if U103.22,19,2 pin voltage is same with battery power : CP100...
  • Page 26 G800 Service Manual CP100 3. Check to see if Q101.7,8 and 9 pin is same with battery power : CP101 CP101 CP101 4. Check to see if U113 .1 pin is same with battery power : CP102 - 25 - PANTECH R&D CONFIDENTIAL...
  • Page 27 G800 Service Manual CP102 CP102 5. Check to see if U103. 21,20.23 and 3 pin is 1.8V, 2.8V, 2.55V_A,1.95V_RTC : CP103 CP103 - 26 - PANTECH R&D CONFIDENTIAL...
  • Page 28 G800 Service Manual CP103 6. Check to see if U103.30 pin becomes to 0V : CP104 Pressing “END” key to turn on equipment. CP104 7. Check to see if C106~109,C121,C100,C102,C103 is 2.8V_M, 1.8V_D : CP105 CP105 - 27 - PANTECH...
  • Page 29 G800 Service Manual CP105 8. Check to see if U106.5 pin and J103.28 pin is 2.8V_EXT : CP107 CP107 CP107 - 28 - PANTECH R&D CONFIDENTIAL...

  • Page 30: Oscillation Check

    G800 Service Manual 6.1.2 Oscillation CHECK Check to see if U101 No. A3 and B3 pin is oscillated(32.768KHz) : CP108 Check R138 and then replace X101 CP108 CP108 Check to see if U107.4 pin Master Clock(13MHz). : CP109 Check U107 No. 1.2 pin and then check the PCB pattern, soldering...

  • Page 31: Keypad Led Not In Operation( Blue )

    G800 Service Manual 6.1.3 KEYPAD LED Not in Operation( blue ) 1.Check to see if R129. 1 pin is around 2.8V(duty:80%, 256Hz) : CP110 Check R129 and Q102 and then replace those 2.Check to see if R123.124.125.126.127.128 is same with battery voltage : CP111 Check the PCB pattern between battery and the resistors.

  • Page 32: Lcd

    G800 Service Manual CP112 CP110 6.1.4 LCD Backlight Not in Operation(White) 1. Check to see if J103.13 pin is around 2.8V(duty:80%, 256Hz) : CP113 Check J103 and resoldering CP113 CP113 - 31 - PANTECH R&D CONFIDENTIAL...

  • Page 33: Audio Part ( Earpiece, Hands-Free Earphone, Microphone, Hands-Free Mic )

    G800 Service Manual 6.2. Audio Part ( Earpiece, Hands-free Earphone, Microphone, Hands-free Mic ) 6.2.1 No receiving tone heard( Ear-piece ) 1.Check to see if U102 Nos. F10.A9 and J8(C118.C119) is 2.55V_A : CP114 2.Check to see if U102 No. A7(C124) is around 1.2V : CP115 Set to HP8922M to connect a call and then set to 1Khz.

  • Page 34: Sidetone Not Transmitted (Earpiece )

    G800 Service Manual CP117 CP119 CP118 6.2.3 Side Tone Not transmitted ( Ear-piece ) Repeat 6-2-1 No receiving tone heard.( Ear-piece ) 1.Check to see if Mic + pin is around 1.8V : CP120 Check that R104,C181 is cold solder,broken,short to the other PCB pattern or not If you find out any defective part, you replace it.
  • Page 35 G800 Service Manual CP120 CP121 CP122 CP121 CP116 CP115 CP114 CP122 CP118 CP119 CP120 - 34 - PANTECH R&D CONFIDENTIAL...

  • Page 36: Hook Switch Not Working

    G800 Service Manual 6.2.5 Hook Switch not working 1.Check to see if U111 No.5 is 2.8V : CP123 2.Check to see if U111 No.1 is 0V during pressing Hook Switch : CP124 3.Check to see if U111 No.3 is around 0.15V : CP125...
  • Page 37 G800 Service Manual CP127 CP128 CP130 CP129 CP129 CP127 CP128 CP117 CP130 - 36 - PANTECH R&D CONFIDENTIAL...

  • Page 38: Vibrator Not Working

    G800 Service Manual 6.4. 6.2.7 Vibrator not working Check to see if U101 No. C5(Q105.2) pin is 2.8V(duty:70%, 70Hz) : CP131 Check to see Q105 cold solder,broken,short to the other PCB pattern or not If you find out any defect, you replace it Check to see J103.11 is same with battery power : CP131,CP132...

  • Page 39: Sim Card Part

    G800 Service Manual 6.3 SIM card part 6.3.1 SIM error Check to see if J103-JST No. 1 pin is 2.85V : CP133 Check to see U103.18 pin cold solder,broken,short to the other PCB pattern or not : CP134 If you find out any defect, you replace it 2.Check to see J103-JST.2.3.6 for wave form : CP135...

  • Page 40: Charger Part

    G800 Service Manual 6.4 Charger part 6.4.1 Charging error Insert adaptor into I/O jack. Check to see if U103. 7 pin is 5.2V : CP136 Check to see J101.23 .24 pin and D116 cold solder,broken,short to the other PCB pattern or not :...
  • Page 41 CP137 G800 Service Manual CP138 CP136 CP139 CP137 - 40 - PANTECH R&D CONFIDENTIAL...

  • Page 42: Blutooth Part

    G800 Service Manual 6.5. Bluetooth part 6.5.1 Bluetooth error After BT_En(U101.A9,U106.3) Pin is enable, Check to see if U108. 1,14,15,19,20 pin is 2.8V : CP140 Check to see U106.5 cold solder,broken,short to the other PCB pattern or not : CP141 If you find out any defect, you replace it 2.Check to see U115.5,U116.5,U117.5,U118.5 pin is 2.8V : CP142...

  • Page 43: Rf Part

    G800 Service Manual CP141 CP141 CP142,CP144 CP143 CP141 - 42 - PANTECH R&D CONFIDENTIAL...
  • Page 44 G800 Service Manual 6.6. RF Part 6.6.1 Test conditions 1. Test condition 1 : VBAT = 3.8V during all tests 2. Test condition 2 : Traffic channel :EGSM Band Tx mode Ch62 Power Level : 13 3. Test condition 3 : Traffic channel :DCS Band...

  • Page 45: Test

    G800 Service Manual 6.6.2 Power Supply Check Point Test Step Typical Value Condition Checking Point point U907 3.8V 2, 3, 4, 5, 6, 7 Check route connection : VBAT Pin#1 U907 2.8V 2, 3, 4, 5, 6, 7 Check route connection : VCC_RFCHIP...

  • Page 46: Power Amplifier Module

    G800 Service Manual Step 2-3 Step 2-4 Fig.6-3 Z710 PAM’s Power Check Point Step 2-3 Step 2-4 Fig.6-4 Z710 PAM’s PCB Layout - 45 - PANTECH R&D CONFIDENTIAL...
  • Page 47 G800 Service Manual 6.6.3 Power Amplifier Module - First check the Power Supply Check point following 6.3.2. Then you can trace the guideline of PAM as follows . Test Step Typical Value Condition Checking Point point Z710 Logic High 2, 3, 4...
  • Page 48 G800 Service Manual Step 3-2 Fig.6-6. PAM DCSSEL Test Point Circuit Step 3-1 Step 3-2 Fig.6-7. PAM TXEN and DCSSEL Test Point on the PCB Layout - 47 - PANTECH R&D CONFIDENTIAL...

  • Page 49: Vctcxo

    G800 Service Manual 6.6.4 VCTCXO Test Step Typical Value Condition Reaction to Abnormality point V801 0.5V ~ 2.5V 2, 3, 4, 5, 6, 7 Check route connection : AFC Pin#1 V801 2.8V 2, 3, 4, 5, 6, 7 Check route connection : VTCXO...

  • Page 50: Antenna Switch Module

    G800 Service Manual 6.6.5 Antenna Switch Module Typical Step Test point Condition Check point Value When Pin#10 is Logic High and Pin#4 Z701 2.8V and Pin#2 is Logic Low the mode is Pin#10 EGSM Tx. While Pin#4 is Logic High and Pin#10 Z701 2.8V...
  • Page 51 G800 Service Manual Fig. 6-11 Antenna Switch Module PCB Layout - 50 - PANTECH R&D CONFIDENTIAL...

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