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Pantech GB310, Service Manual

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GB310 Service Manual  
                                                                                                                                                                                  

1 

PANTECH 

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 

NO   Check that  C148 is cold solder,broken,short to the other  

                   PCB pattern or not. 

      If you find out any defective part, you replace it.  

Set to HP8922M to connect a call and then set to 1kHz with Echo audio mode. 

3. Check C148 pins for wave form : CP119 

NO   Replace Handsfree Mic. 

 

 

 
 

 

 

CP119 

Summary of Contents for GB310

Page 1: ...B310 GB310 Service Manual GSM Cellular Phone Pantech Co Ltd Korea June 7 2004 1st Edition For Use by Authorized Service Maintenance Personal Only Documents to Receive This Addendum GB310 Maintenance R...

Page 2: ...AN OVERVIEW OF RECEIVE SECTION 17 4 2 3 2 RECEIVER PART 18 4 2 4 TRANSMIT SECTION 19 4 2 4 1 AN OVERVIEW OF TRANSMIT SECTION 19 4 2 4 2 TRANSMITTER PART 20 4 2 5 OFFSET PLL 21 4 2 5 1 AN OVERVIEW OF O...

Page 3: ...WORKING 41 6 3 SIM CARD PART 42 6 3 1 SIM ERROR 42 6 4 CHARGER PART 43 6 4 1 CHARGING ERROR 43 6 5 RF PART 45 6 5 1 TEST CONDITIONS 45 6 5 2 POWER SUPPLY CHECK POINT 46 6 5 3 POWER AMPLIFIER MODULE 4...

Page 4: ...the MS and the NS performs the switching of calls between the mobile and other fixed or mobile network users as well as mobility management The MS and the BS subsystem communicate across the Um interf...

Page 5: ...ppropriately to ensure its best performance This product consists of a handset battery pack and Travel charger 1 4 Characteristics 1 All the active devices of GB310 are made of semiconductors to ensur...

Page 6: ...Frequency Error 90Hz 180Hz Phase Error RMS 5 PEAK 20 Minimum Output Power 5 5 0 5 dBm Power Control 5 19 2 dB Step 0 15 2 dB Step Output RF Spectrum TS 100 910V6 2 0 Switching Transient TS 100 910V6 2...

Page 7: ...GB310 Service Manual 1 PANTECH Section 3 Operation 3 1 Name of each part Display Screen Intenna Mic Speaker...

Page 8: ...x 3 2 T Active Area 26 1 W x 28 15 H Dot pitch 0 068 W x 0 22 H 3 3 Keypad Market Goal Projected Actual Comments English Keypad 0 9 Send Color End Pwr Color Up Melody Down Phonebook SoftKey1 My menu S...

Page 9: ...chipset implemented for GSM terminal s system control and baseband digital signal processing Major parts used in the logic part are as follows 1 AD6525 U101 ARM7 Processor Core DBB GSM Signal Processi...

Page 10: ...ode consisting of speech transcoding and Channel equalization as follows 1 Speech transcoding In full rate the DSP receives the speech data stream from VBC and encodes data from 104kbps to 13kbps Usin...

Page 11: ...eral devices All GPIO pins start up as inputs Additional purpose inputs and outputs are available under SW control 8 Speech Transcoding In full rate mode the DSP receive the speech data stream from th...

Page 12: ...or data is stored in flash memory U103 And generated by A10 GPIO_9 pin 3 2color LED This is a device to indicate a notification mode using the lamp U102 Nos L16 and M16 signal drives the lamp to flash...

Page 13: ...ure that avoids the difficulties associated with direct conversion while delivering lower solution cost and reduced complexity The transmit section is a complete up conversion path from the baseband s...

Page 14: ...turn 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 Si4...

Page 15: ...GB310 Service Manual 1 PANTECH 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...

Page 16: ...modes The mixer output is amplified with an analog programmable gain amplifier PGA which is controlled with the AGAIN bits in register 05h The quadrature IF signal is digitized with high resolution A...

Page 17: ...loss is about 0 8 dB for the receiving bands at 25o C and about 1 35 dB for the transmitting bands at 25o C B SAW filter BPF Band select filter F301 F303 The F301 filter is for the GSM850 band signals...

Page 18: ...frequency is generated between 766 and 896 MHz and internally divided by 2 to generate the quadrature LO signals for the quadrature modulator resulting in an IF between 383 and 448 MHz For the GSM 85...

Page 19: ...ated frequencies C Power AMP Module PAM U303 This device amplifies signals ahead of transmiting them through the antenna to provide a sufficient RF power It has amplification factor of 28dB and effici...

Page 20: ...ll VCO tuning inductors are also integrated The IF and RF output frequencies are set by programming the N Divider registers NRF1 NRF2 and NIF Programming the N Divider register for either RF1 or RF2 a...

Page 21: ...oltage 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 Fig 4 11 To...

Page 22: ...emark 8960 GSM Mobile Station Test Set Agilent Technologies 8593E Spectrum Analyzer Hewlett Packard TDS 340A Oscilloscope Tektronix FLUKE 87 Digital Multimeter Fluke E3630A DC Power Supply Hewlett Pac...

Page 23: ...GB310 Service Manual 1 PANTECH 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 GND VBATT...

Page 24: ...GB310 Service Manual 1 PANTECH 2 Check to see if C124 1 or C123 pin voltage is same with battery power CP100 CP100 CP100...

Page 25: ...GB310 Service Manual 1 PANTECH 3 Check to see if Q101 5 6 and R160 pin is same with battery power CP101 CP101 CP101...

Page 26: ...GB310 Service Manual 1 PANTECH 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...

Page 27: ...GB310 Service Manual 1 PANTECH 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...

Page 28: ...GB310 Service Manual 1 PANTECH 8 Check to see if U103 K5 J5 pin and C152 C153 is 2 8V_M CP105 CP105 CP105...

Page 29: ...GB310 Service Manual 1 PANTECH 9 Check to ses if PAD1 pin R177and D120 C213 pin is 2 8V_EXT CP106 CP106...

Page 30: ...K 1 Check to see if U101 No A3 and B3 pin is oscillated 32 768KHz CP107 NO Check R141 and then replace X101 2 Check to see if U101 L12 pin Master Clock 13MHz CP108 NO Check TP116 C137 pin and then che...

Page 31: ...rvice Manual 1 PANTECH 6 1 3 KEYPAD LED Not in Operation 1 Check to see if R179 R182 are same with battery voltage CP110 NO Replace the resistors 2 Check R175 signal control PWM CP111 3 Check Q102 CP1...

Page 32: ...310 Service Manual 1 PANTECH 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 CP1...

Page 33: ...one 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 NO Replace U102 2 VOICE BELL TONE Check U104 1...

Page 34: ...tone heard Hands free Earphone 1 Check to see if U101 B11 J106 1 is around 0V NO Check to see J106 CP115 Set to HP8922M to connect a call and then set to 1kHz 2 Check C157 pin for waveform CP116 3 Ch...

Page 35: ...see if Mic pin is around 1 84V CP117 NO 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 Set to HP8922M...

Page 36: ...e Earphone 1 Check to see if R144 pin is 2 5V CP119 NO Check that C148 is cold solder broken short to the other PCB pattern or not If you find out any defective part you replace it Set to HP8922M to c...

Page 37: ...ssing Hook Switch CP120 NO 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 Check to see if Q104 1 pin is around 0V when yo...

Page 38: ...CP121 2 Check to see if R197 C198 is 2 8 V CP122 3 Check U104 12 13 14pin for waveform CP123 NO Check that C175 R200 R202 C176and R201 cold solder broken short to the other PCB pattern or not Check U...

Page 39: ...roken short to the other PCB pattern or not If you find out any defect you replace it 2 Check to see C194 is same with battery power CP125 NO Check to see Q103 cold solder broken short to the other PC...

Page 40: ...O 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 NO Check to see J105 R171 cold...

Page 41: ...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 Check to see Q101 No 1 2 pin is 5 2V CP129 NO Check to see Q101 R157 R159 C164 co...

Page 42: ...GB310 Service Manual 1 PANTECH CP128 CP129 CP130...

Page 43: ...fic channel GSM850 Band Tx mode Ch190 Power Level 13 3 Test condition 3 Traffic channel PCS Band Tx mode Ch662 Power Level 10 4 Test condition 4 Traffic channel GSM850 Band Rx mode Ch190 Input power 7...

Page 44: ...1 3 8V 2 3 4 5 Check route connection VBAT 2 2 U305 Pin 5 2 8V 2 3 4 5 Check route connection VBAT 2 3 U303 Pin 4 3 8V 2 3 4 5 Check route connection VBAT 2 4 U303 Pin 5 2 8V 2 3 4 5 Check route conn...

Page 45: ...GB310 Service Manual 1 PANTECH Fig 6 3 U303 PAM s Power Check Point Fig 6 4 U303 PAM s PCB Layout TYP 2 8V TYP 3 8V...

Page 46: ...race the guideline of PAM as follows Step Test point Typical Value Condition Checking Point 3 1 U303 Pin 3 Logic High 2 3 Check route connection TXEN Logic High 3 5 3 2 U303 Pin 2 Logic Low 2 4 Check...

Page 47: ...GB310 Service Manual 1 PANTECH Fig 6 6 U303 PAM PCSSEL Test Point Circuit Fig 6 7 U303 PAM TXEN and PCSSEL Test Point on the PCB Layout STEP 3 2...

Page 48: ...Value Condition Reaction to Abnormality 4 1 U302 Pin 1 0 5V 2 5V 2 3 4 5 Check route connection AFC 4 2 U302 Pin 4 2 8V 2 3 4 5 Check route connection VTCXO Fig 6 8 U302 VCTCXO Check Point Circuit Fi...

Page 49: ...1 U320 Pin 11 2 6V 2 5 2 U320 Pin 2 2 6V 3 When Pin 11 is Logic High and Pin 2 is Logic Low the mode is GSM 850 band While Pin 2 is Logic High and Pin 11 is Logic Low the operating mode is PCS band F...

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