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Pantech GB310 Service Manual

Gsm cellular phone
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GB310 Service Manual
GB310
GB310 Service Manual
(GSM Cellular Phone)
Pantech Co., Ltd., Korea
June 7, 2004
st
1
Edition
For Use by Authorized Service/Maintenance Personal Only
Documents to Receive This Addendum:
GB310 Maintenance/Repair/Operating Manual

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  • Page 1 GB310 Service Manual GB310 GB310 Service Manual (GSM Cellular Phone) Pantech Co., Ltd., Korea June 7, 2004 Edition For Use by Authorized Service/Maintenance Personal Only Documents to Receive This Addendum: GB310 Maintenance/Repair/Operating Manual...

  • Page 2: Table Of Contents

    GB310 Service Manual CONTENTS SECTION 1 INTRODUCTION ......................3 1.1 I ..........................3 NTRODUCTION 1.2 F ...................3 REQUENCY LLOCATION AND 1.3 I ........................4 AME AND 1.4 C ........................4 HARACTERISTICS SECTION 2 ELECTRICAL SPECIFICATIONS..................5 2.1 G ............................5 ENERAL 2.2 T …………………………………………………………………………………………….5 RANSMITTER 2.3 R …………………………………………………………………………………………………5...
  • Page 3 GB310 Service Manual 6.2.7 VIBRATOR NOT WORKING …………………………………………………………………...…41 6.3 SIM CARD PART ……………………………………...…………………………………………….42 6.3.1 SIM ………………………………………………………………………………………….42 ERROR 6.4 CHARGER PART……………………………………………………………………………………..43 6.4.1 C ………………………………..…………………………………………………43 HARGING ERROR 6.5 RF PART…………….………………………………………………………………………………… 45 6.5.1 T ………………………………………………………………… …………………45 EST CONDITIONS 6.5.2 P ……………………………………………………………………….46 OWER UPPLY HECK POINT 6.5.3 P...

  • Page 4: Section 1 Introduction

    GB310 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: Item Name And Use

    2) Surface mounting device (SMD) is used to ensure high reliability, compactness and lightness. 3) GB310 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...

  • Page 6: Section 2 Electrical Specifications

    GB310 Service Manual Section 2. Electrical Specifications 2.1 General GSM850 / PCS Band Mobile Transmit Frequency 824 MHz ~ 849 MHz / 1850MHz ~ 1910MHz Mobile Receive Frequency 869 MHz ~ 894 MHz / 1930MHz ~ 1990MHz The Number of Time Slot...

  • Page 7: Section 3 Operation

    GB310 Service Manual Section 3 Operation 3.1 Name of each part Intenna Display Screen Speaker PANTECH...

  • Page 8: Display

    GB310 Service Manual 3.2 Display(Single LCD) Parameter Projected Actual (MAIN LCD) Display Color LTPS LCD with white LED back lighting 65k colors European Character : (font size : 16×16) 7 lines x 8 characters Chinese Character : (font size : 16×16) 7 lines × 8 characters...

  • Page 9: Section 4 Theory Of Operation

    GB310 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”. AD6535(U102) control that power manage regarding power on/off in handset Pressing POWERKEY on the key pad is active on the handset.
  • Page 10 GB310 Service Manual ☞ Configuration by Function of AD6525 1 Microprocessor Core AD6525 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 11: Memory Part

    GB310 Service Manual This interfaces the RF part to control power amplifier, Tx LO buffer amplifier, VC-TCXO, and AGC-end on transmit/receive paths in the RF part. 1) Transmitter Interface: This transmits TX_AGC signal to Tx AGC amplifier to adjust transmit power level and sends Ramp_DAC signal to the RF part to control power amplifier.

  • Page 12: Notification Part

    GB310 Service Manual SRAM has a capacity of 16Mbit(2MByte) and stores system parameters, data buffer, and stack of each task in it. 3 Key Tone Generation All alert signals are generated by the DSP and output to the ABB audio output.

  • Page 13: Radio Transceiver Section

    4.2 Radio Transceiver Section Fig.4-1. RF Transceiver block diagram The GB310’s RF Transceiver(U304), 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 14: Dc Distribution And Regulation Part

    GB310 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.

  • Page 15: Receive Section

    GB310 Service Manual Table 4-1. Pin Description of Si4200DB-BM 4.2.3 Receiver Section 4.2.3.1 An Overview of Receive section Fig.4-6. Receiver block diagram PANTECH...

  • Page 16: Receiver Part

    GB310 Service Manual GB310’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 SAW filter required in conventional superheterodyne architectures. Compared to a...
  • Page 17 GB310 Service Manual is 881.5±12.5MHz for GSM850 bands, 1960.2±30 MHz for PCS bands and transmits it to dual saw filter. The Tx filter passes through the output signals of frequency band that is 836.5MHz ± 12.5MHz for GSM850 bands, 1880.2 ±30 MHz for PCS bands from the power amplifier and transmits it to the antenna.

  • Page 18: Transmit Section

    GB310 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 (U303), 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 19: Transmitter Part

    GB310 Service Manual 4.2.4.2 Transmitter Part A. 6 dB attenuator : Z301, Z302 These passive components are adopted for PAM to operate in a stable output power. B. ASM(Antenna Switch Module / built in LPF): U320 These filters pass through the signals of which frequency band of 824~849MHz,...

  • Page 20: Offset Pll

    GB310 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 21: Vctcxo

    GB310 Service Manual 4.2.5.2 VC-TCXO(Voltage Controlled Temperature Compensated Crystal Oscillator): U302 This is the mobile station’s reference frequency source. Its frequency is 13MHz, this signal is applied to Si4205(U304)_pin8. VCTCXO Fig.4-11. Top view of VCTCXO part on the PCB artwork...

  • Page 22: Section 5 Alignment Procedure

    GB310 Service Manual Section 5. Alignment Procedure 5.1 Recommended Test Equipment Model No. Description Maker Remark GSM Mobile Station 8960 Agilent Technologies Test Set 8593E Spectrum Analyzer Hewlett Packard TDS 340A Oscilloscope Tektronix FLUKE 87 Digital Multimeter Fluke E3630A DC Power Supply...

  • Page 23: Section 6 Equipment Repair Procedure

    GB310 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. VBATT PANTECH...
  • Page 24 GB310 Service Manual 2. Check to see if C124.1 or C123 pin voltage is same with battery power : CP100 CP100 CP100 PANTECH...
  • Page 25 GB310 Service Manual 3. Check to see if Q101.5,6 and R160 pin is same with battery power : CP101 CP101 CP101 PANTECH...
  • Page 26 GB310 Service Manual 4. Check to see if U102 and C154, C156, C161, C163, C165, C166, C167 pin is 2.8V_EXT, 2.8V_M, 1.8V_D, VMIC, VTCXO, VSIM, 1.95V_RTC : CP102 CP102 CP102 PANTECH...
  • Page 27 GB310 Service Manual 6. Check to see if U102.R7 or D101, D102, C168, R162 pin becomes to 0V : CP103 Pressing “END” key to turn on equipment. CP103 CP103 CP104 CP104 PANTECH...
  • Page 28 GB310 Service Manual 8.Check to see if U103.K5,J5 pin and C152,C153 is 2.8V_M : CP105 CP105 CP105 PANTECH...
  • Page 29 GB310 Service Manual 9.Check to ses if PAD1 pin R177and D120, C213 pin is 2.8V_EXT : CP106 CP106 PANTECH...

  • Page 30: Oscillation Check

    GB310 Service Manual 6.1.2 Oscillation CHECK 1. Check to see if U101 No. A3 and B3 pin is oscillated(32.768KHz) : CP107 Check R141 and then replace X101 CP107 CP107 2. Check to see if U101.L12 pin Master Clock(13MHz). : CP108...

  • Page 31: Keypad Led Not In Operation

    GB310 Service Manual 6.1.3 KEYPAD LED Not in Operation 1. Check to see if R179 ~ R182 are same with battery voltage : CP110 Replace the resistors. 2. Check R175 signal (control PWM) : CP111 3. Check Q102 CP110 CP111...

  • Page 32: Lcd

    GB310 Service Manual 6.1.4 LCD Backlight Not in Operation (White) 1. Check to see if U331.4 or R209 pins are controlled GPIO (2.8V): CP112 2. Check to see if D121 or PAD2 1pin is around 10V. CP112 CP112 PANTECH...

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

    GB310 Service Manual 6.2 Audio Part ( Earpiece, Hands-free Earphone, Microphone, Hands-free Mic ) 6.2.1 No receiving tone heard ( Ear-piece ) 1.DTMF,BEEP TONE: Check U102.J15 and K15(C130,C132,C169,C170) pins (Ear Signal) for waveform : CP113 Replace U102. 2.VOICE,BELL TONE : Check U104.17,18 and C211,C212 pins for waveform. : CP114 Replace U104.
  • Page 34 GB310 Service Manual 6.2.2 No Receivng tone heard ( Hands-free Earphone ) 1. Check to see if U101.B11 (J106.1) is around 0V: Check to see J106 : CP115 Set to HP8922M to connect a call and then set to 1kHz.

  • Page 35: Sidetone Not Transmitted (Earpiece )

    GB310 Service Manual 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 1.84V : CP117 Check that R142, C202, C135 and R145 is cold solder, broken, short to the other PCB pattern or not If you find out any defective part, you replace it.
  • Page 36 GB310 Service Manual 6.2.4 Side Tone Not transmitted ( Hands-free Mic. ) Repeat 6-2-2 No receiving tone heard.( Hands-free Earphone ). 1. Check to see if R144 pin is 2.5V : CP119 Check that C148 is cold solder,broken,short to the other PCB pattern or not.

  • Page 37: Hook Switch Not Working

    GB310 Service Manual 6.2.5 Hook Switch not working 1. Check to see if Q104.1 pin is 2.4V : CP120 2. Check to see if Q104.1 pin is 0V during pressing Hook Switch : CP120 Check that R155 and R156 cold solder, broken, short to the other PCB pattern or not If you find out any defect, you replace it 3.

  • Page 38: Melody Not Ringing

    GB310 Service Manual 6.2.6 Melody not ringing 1. Check to see if C199, C172 is Vbat : CP121 2. Check to see if R197,C198 is 2.8 V : CP122 3.Check U104.12,13,14pin for waveform: CP123 Check that C175,R200,R202,C176and R201 cold solder, broken, short to the other...

  • Page 39: Vibrator Not Working

    GB310 Service Manual 6.2.7 Vibrator not working 1. Check to see if Q103.1 pin is 2.8V (duty : 60%, 70Hz) : CP124 Check to see Q103 cold solder, broken, short to the other PCB pattern or not If you find out any defect, you replace it 2.

  • Page 40: Sim Card Part

    GB310 Service Manual 6.3 SIM card part 6.3.1 SIM error Check to see if J105.1 pin is around 2.85V : CP126 Check to see C197 pin cold solder, broken, short to the other PCB pattern or not : If you find out any defect, you replace it 2.Check to see J105.2, 3, 6 for wave form : CP127...

  • Page 41: Charger Part

    GB310 Service Manual 6.4 Charger part 6.4.1 Charging error Insert adaptor into I/O jack. Check to see if F100, D118 pin is 5.2V : CP128 Check to see J101.23, 24(I/O connector) pin and F100, D118 cold solder, broken, short to the other PCB pattern or not : If you find out any defect, you replace it 2.
  • Page 42 GB310 Service Manual CP128 CP129 CP130 PANTECH...

  • Page 43: Rf Part

    GB310 Service Manual 6.5 RF Part 6.5.1 Test conditions 1. Test condition 1 : VBAT = 3.8V during all tests 2. Test condition 2 : Traffic channel :GSM850 Band Tx mode Ch190 Power Level : 13 3. Test condition 3 : Traffic channel : PCS Band...

  • Page 44: Power Supply Check Point

    GB310 Service Manual 6.5.2 Power Supply Check Point Test Step Typical Value Condition Checking Point point U305 3.8V 2, 3, 4, 5 Check route connection : VBAT Pin#1 U305 2.8V 2, 3, 4, 5 Check route connection : VBAT Pin#5 U303 3.8V...
  • Page 45 GB310 Service Manual TYP 3.8V TYP 2.8V Fig.6-3 U303 PAM’s Power Check Point Fig.6-4 U303 PAM’s PCB Layout PANTECH...

  • Page 46: Power Amplifier Module

    GB310 Service Manual 6.5.3 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 U303 Logic High 2, 3...
  • Page 47 GB310 Service Manual STEP 3-2 Fig.6-6. U303 PAM PCSSEL Test Point Circuit Fig.6-7. U303 PAM TXEN and PCSSEL Test Point on the PCB Layout PANTECH...

  • Page 48: Vctcxo

    GB310 Service Manual 6.5.4 VCTCXO Test Step Typical Value Condition Reaction to Abnormality point U302 0.5V ~ 2.5V 2, 3, 4, 5 Check route connection : AFC Pin#1 U302 2.8V 2, 3, 4, 5 Check route connection : VTCXO Pin#4...

  • Page 49: Antenna Switch Module

    GB310 Service Manual 6.5.5 Antenna Switch Module Step Test point Typical Value Condition Check point When Pin#11 is Logic High and Pin#2 U320 2.6V is Logic Low the mode is GSM 850 Pin#11 band. U320 While Pin#2 is Logic High and Pin#11 2.6V...

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