Nokia RH-13 Series Troubleshooting Manual Download Page 73

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CCS Technical Documentation

Troubleshooting

RH-13

Issue 1 11/02

Nokia Corporation

Page 73

GSM RX tunings

LP and AMP2 filters tunings

- This is done using Safari internal loop. No external signal is needed

If it fails there can be following problems:

- Safari problem

GSM AFC tuning

- Purpose of the tuning is to correct phone frequency error

If AFC tuníng fails it might be due to:

- Problems with upper band signal path (synthesizer etc.)

- VCTCXO component can be broken

- (UEM)

- (UPP)

GSM UB LNA GAIN AND RSSI OFFSET

- UB GSM reference gain (around 74 dB), measured when lna is switched off

- UB LNA gain step, measured when lna is switched on. Result is gain difference between
lna on and off (around 21 dB)

If it fails there can be following problems:

- Rx chain is totally deaf or some gain is missing, start receiver troubleshooting

GSM LB LNA GAIN AND RSSI OFFSET

- UB GSM reference gain (around 77 dB), measured when lna is switched off

- UB LNA gain step, measured when lna is switched on. Result is gain difference between
lna on and off (around 20 dB)

If it fails there can be following problems:

- Rx chain is totally deaf or some gain is missing, start receiver troubleshooting

RX temperature calibration

- NTC resistor calibration in ambient temperature

Summary of Contents for RH-13 Series

Page 1: ...CCS Technical Documentation RH 13 Series Transceivers Issue 1 11 02 ãNokia Corporation Troubleshooting ...

Page 2: ...play Keyboard lights do not work 23 Display does not work 24 Buzzer does not work 24 Vibra does not work 25 Keyboard does not work 25 SIM does not work 25 Infrared does not work 26 RF troubleshooting 27 Repairing instructions for RF Unit 27 Introduction 27 Abbreviations in fault finding chart 28 Receiver 29 General instructions for RX troubleshooting 29 Path of the received signal 30 AMPS 31 Step ...

Page 3: ... PLL 67 TX VHF VCO 68 Fault finding chart for TX VHF VCO 68 UHF SYNTHESIZER 69 Description of RH 13 RF auto tune tunings 70 TDMA RF tunings 70 TDMA RX tunings 70 TDMA TX tunings 71 GSM RF tunings 72 GSM RX tunings 73 GSM TX tunings 74 PA TROUBLESHOOTING FOR SALIERI 75 List of Figures Fig 1 UEM regulator s filter capacitors 6 Fig 2 BB testpoints 7 Fig 3 Power up sequence 10 Fig 4 Fault tree phone d...

Page 4: ...nt 48 Fig 30 RF controls 49 Fig 31 RX VHF VCO signal level and frequency 49 Fig 32 UHF VCO signal level and frequency 50 Fig 33 RF controls 51 Fig 34 RX I Q signal 51 Fig 35 IF signal level 53 Fig 36 TX signal path 54 Fig 37 RF Test 55 Fig 38 RF controls 55 Fig 39 Fault finding chart 56 Fig 40 TDMA1900 58 Fig 41 GSM1900 58 Fig 42 Fault finding chart 59 Fig 43 Power detection 61 Fig 44 Fault findin...

Page 5: ...local or test mode at start up if correspond ing resistors are connected Note Baseband doesn t wake up automatically when the battery voltage is connected normal mode Power can be switched on by Pressing the power key connecting a charger RC alarm function In the local and test mode the baseband can be controlled through MBUS or FBUS FBUS is recommended connections by a Phoenix service software Mo...

Page 6: ...leshooting CCS Technical Documentation Page 6 ãNokia Corporation Issue 1 11 02 Measurement points Figure 1 UEM regulator s filter capacitors VR6 VR4 VR2 VR7 VR3 VR1B VR1A VCORE VFLASH VFLASH VANA VSIM VIO VR5 UEM ...

Page 7: ...leshooting RH 13 Issue 1 11 02 ãNokia Corporation Page 7 Figure 2 BB testpoints SLEEPCLK UEMINT SLEEPX PURX DbusDA CbusDA CbusENX Fbus TX CbusCLK DbusCLK FbusRX DbusENX MbusRX MbusTX RFCLK Init clk 19 22MHz GSM 13MHz TDMA UEM FLASH UPP ...

Page 8: ...rvice The Baseband Troubleshooting instructions consists of the following topics Power up Flash programming Audio Earpiece Microphone Charging Accessory detection Data cable Sleep clock User interface Display Lights Buzzer Vibra Keyboard Infra red Power up faults Power up sequence UEM acts as a HW master during start up Vbatt limits 2 1V for internal state machine 3V triggering whole startup Regul...

Page 9: ...e UEM switching the regulators OFF MCU starts running the Bootstrap Code written in stone UPP internal ROM the program checks if there exists any reason for FDL mode Flash Down Load If there exists executable code in FLASH and there exists no reason for FDL the MCU starts running the MCU program from FLASH MCU runs the FLASH MCU code the phone initialization user interfaces internal blocks etc Cor...

Page 10: ...9 2 MHz running 3 Purx released Purx released by UEM UEMINT goes high for 100 ms and about 500ms RFCLK will change 13MHz GSM mode SleepX goes high and UEM starts feeding SleepClk 32 KHz to UPP NOTE Sleepclock starts running in crystal circuitry B200 immediately when battery voltage is supplied 4 Software running Default value for Vcore is 1 5 volts and if software is running Vcore will rise to 1 8...

Page 11: ...e to force phone on by disabling watch dog Instead measurements should be done immediately when power key pressed or when battery voltage connected to phone local test mode The easist way to check if software is running when phone takes abnormal amount of current is to measure cbusclk and Vcore Dbus clock programmable 9 72MHz TDMA 13MHz GSM is not automatically visible on test and local mode ...

Page 12: ...sh1 Vana Vio Vcore VR3 when pwr key pressed Check 13MHz GSM or 19 44 TDMA RF clock from C420 Check that purx goes up to 1 8V Change UPP D400 Change the UEM D200 OK Measure VBAT from C262 Check R202 R203 R205 C217 C220 Check G801 missing misaligned Measure J406 1 08 MHz TDMA and 1 00MHz GSM Check C420 Check 19 2MHz from G801 See RF troubleshooting FAIL Re flash phone OK OK FAIL VR3 missing FAIL OK ...

Page 13: ...y Prommer If bootstrap is not requested bootstrap code jumps to FLASH SW If Bootstrap code is requested UPP enters Flash mode and sets FbusTX to 0 as acknowledgement to prommer This is an indication that UPP can run at least the fixed Bootstrap code although not able to run FLASH code UPP then sends an UPP ID to prommer via FBUSTX line After prommer has received UPP ID it sends corresponding Secon...

Page 14: ...PP MbusRx SA0 FbusRx from Prommer UEM UPP FbusTx from UPP UEM Prommer C104 MCU ID message sending failed in the Phone FbusTx from UPP UEM Prommer C105 The Phone has not received Secondary boot codes length bytes correctly Mbus from Prommer UEM UPP MbusRx FbusRx from Prommer UEM UPP FbusTx from UPP UEM Prommer C106 The Phone has not received Secondary code bytes correctly Mbus from Prommer UEM UPP ...

Page 15: ...nsfer C384 during algorithm download to target phone C584 during erasing C684 during programming Flash UPP Signals between UPP Flash C585 C685 Data block handling timeout C585 during erasing C685 during programming Flash UPP Signals between UPP Flash C586 C686 The status response from the Phone informs about fail C586 during erasing C686 during programming Flash ...

Page 16: ...r and check audios 2 In case of earpiece XMIC fail Feed 1Khz signal to XMIC line and measure signal from earpiece line Audio test box JBA 8 is needed Audio loop Audio test Ext In Hp Out must be switched on by Phoenix service software This loop will connect audios only through UEM In this case UPP is not used Phone doesn t start charging Connect charger and check VCHARIN check CHRG_CTRL if used ACP...

Page 17: ... measure signal from XEAR line Audio test box JBA 8 is needed Audio loop Audio test Hp In Ext Out must be switched on by Phoenix service software This loop will con nect audios only through UEM In this case UPP is not used 4 Run audio loop selftest with Phoenix BB Self tests ST_EAR_DATA_LOOP_TEST This loop will test the eardata micdata lines between UPP and UEM ...

Page 18: ...hone line does not work Figure 6 Fault tree earpiece fail Earpiece doesn t work Run audio loop selftest with phoenix Check R157 L152 L158 C150 C164 C153 C165 R152 C156 C155 R164 R161 R153 R150 C159 C167 V153 Check earpiece Change UEM Feed 1KHz to Xmic by JBA 8 and measure from earpiece Change UPP Fail OK OK OK Fail OK ...

Page 19: ...es not work Figure 7 Fault tree microphone fail Microphone doesn t work Run audio loop selftest with phoenix Check C151 C152 C157 L151 C162 C168 C169 R156 R162 R166 R159 C154 C158 C161 C166 R163 L159 V152 Check microphone Change UEM Feed 1KHz to Mic and measure from Xear by JBA 8 Change UPP Fail Ok Ok Ok Ok Fail ...

Page 20: ...50 and hookint value between 0 30 Figure 8 Fault tree accessory detection Accessory detection doesn t work normally Check HeadInt and HookInt ad value with Phoenix No accessory connected HeadInt and HooInt 1000 Change UEM Check headint line L152 C150 R152 C153 R154 C160 R153 R150 C159 Check hookint line L159 R163 C158 R155 R151 C161 V152 Check bottom connector Connect HDC 9 and keep the HDC 9 swit...

Page 21: ...t tree data cable Sleep Clock Missing non functional sleep clock causes Entering sleep mode fails higher current consumption shorter standby time Baseband self tests cannot be run DLR 3 data cable doesn t work Connect DLR 3 check DLR 3 detection Change UEM Check V151 V152 R161 C164 L158 Check the components of XMIC HEADINT and MICB2 lines Check bottom connector Check SGND voltage from bottom conne...

Page 22: ...rporation Issue 1 11 02 Phone clock on display does not function properly Figure 10 Fault tree sleep clock Sleep mode not working Measure sleep clock from J404 Check C203 C204 Change B200 Change UPP D400 Fail Measure sleep clock from B200 Change UEM D200 Fail Ok Ok Ok ...

Page 23: ...ts do not work Figure 11 Fault tree Display Keyboard lights Display Keyboard lights are not working Check R300 Display and R301 Keyboard Replace resistor s Check LEDs V300 V303 V310 V311 Display and V304 V309 Keyboard Replace LED s Use Display Test in Phoenix to set lights ON OFF FAIL OK FAIL OK Replace UEM FAIL ...

Page 24: ... Check PWB and elastomer connector Run LCD test in Phoenix BB Self Tests ST_LCD_TEST Proceed to phone doesn t power up troubleshooting Replace display module Clean PWB and replace elastomer if needed Check capacitors C302 C304 FAIL OK FAIL FAIL OK FAIL Replace capacitors s FAIL Replace elastomer OK OK Replace display module FAIL Use Display Test in Phoenix to check if display works OK In any phase...

Page 25: ...enix to set vibra parameters frequency duty cycle If it doesn t effect to the magnitude of vibration change vibra Keyboard does not work Check that there is no dirt between the dome sheet and the PWB also check that Z300 is properly soldered and the corner mark is located in the right place If the keyboard still doesn t operate normally try to use Keyboard test in Phoenix to see if the pressed key...

Page 26: ... module VCC pin6 should be 2 78V Change UEM D200 Check R350 R351 C351 and V350 Replace faulty component s Use ST_IR_LOOP_TEST in BB Self Tests in Phoenix FAIL OK FAIL OK Use ST_IR_IF_TEST in BB Self Tests in Phoenix OK Phone OK Measure Tx Data from IR module pin3 2 78V 9 6 115 2kbps FAIL Measure Rx Data from IR module pin4 OK Change IR module OK Change UEM FAIL OK UPP or UEM is faulty FAIL ...

Page 27: ...uency band To simplifying troubleshooting this RF troubleshooting document is divides into three bigger sections Receiver Transmitter and Synthesizer parts The tolerance is specified for critical signals voltages Before changing single ASICs or components please check the following things 1 The soldering and alignment marks of the ASICs 2 Supply voltages and control signals are OK The PA module is...

Page 28: ...band LB Low band LO Local Oscillator P Power of signal in decibels dB measured with spectrum analyzer PA Power Amplifier PWB Printed Wiring Board PWRDET Power detector module PLL Phase Locked Loop RF Radio Frequency RX Receiver T Time between pulses TX Transmitter U C Up converter mixer and driver in same package UHF Ultra High Frequency V Voltage of signal measured with oscilloscope VCO Voltage c...

Page 29: ... charts are represented for each band and more detailed troubleshooting instructions are included Please note that before changing ASICs or filters all solderings and missing components must be checked visually After any possible component changes phone must be re tuned using Phoenix Equipment needed for receiver troubleshooting Signal generator up to 2 GHz Oscilloscope with 10x passive probe Spec...

Page 30: ...plex filter 850 1900 LNA 1900 LNA 850 Band filter Band filter 1st mixer 1st mixer GSM ch filter TDMA ch filter AGC AGC 2nd mixer 2nd mixer Buffer Buffer BB filter BB filter AGC AGC Q I Q I SAFARI GTE UHF LO VHF LO 1930 1990 MHz 869 894 MHz 133 2 MHz BW200 kHz 134 04 MHz BW30 kHz 2063 4 2124 MHz 1002 4 1028 01MHz VCO 2 133 2 MHz VCO 2 AGC 1 31 dB 5 steps AGC 6 36 dB 7 steps TDMA AGC 6 30 dB 5 steps...

Page 31: ...ottom connector to audio analyzer A MPS RX is OK SINA D 12 dB SINA D 12 dB A pply signal to ext antenna connector f 881 409 MHz ch 380 unmodulated level 50 dBm Check signal level at diplexer Z908 input Replace external antenna connector X 900 Not OK OK Check signal level at duplex filter Z906 input Replace diplexer Z908 Not OK OK Check signal level at L NA _a input coil pad L 802 If coil L 802 is ...

Page 32: ... RX band filter Z801 Not OK OK Check signal level at IF filter Z803 input 134 04 MHz Not OK OK Start synthesizer troubleshooting OK Not OK Check signal level at IF filter Z803 output 134 04 MHz Not OK OK Replace IF filter Z803 Check signal level at RX I Q J808 J809 J818 J819 Not OK OK Start synthesizer troubleshooting Check UE M and start baseband troubleshooting Measure V R4 from L 812 and L 811p...

Page 33: ...02 ãNokia Corporation Page 33 Audio test Please use Phoenix RF control to set phone to the correct operation mode Figure 15 RF Test Enable audio using Phoenix software maintenance testing audio test mode set audio test mode See picture below Figure 16 Audio Test ...

Page 34: ...to 881 4091125 and level to 80 dBm 2 Set phone to TDMA mode and select RF Test UI in Phoenix Maintenance Test ing RF Test Figure 17 RF Test 3 Make sure that signal generator allows phone TX power going to its output Use low power level for example 10 Set channel to 380 and select Write Init 4 Set spectrum analyzer settings as following Center frequency 268 08 MHz Span 200 kHz RBW 3 kHz reference l...

Page 35: ... Test 3 Make sure that signal generator allows phone TX power going to its output Use low power level for example 10 Set channel to 380 and press Write Init 4 Connect oscilloscope probe to one of the RX I Q test points on PWB all four testpoints J808 J809 J818 and J819 are located behind display 5 Check that there is a clean signal in each test points 6 Decrease signal level slowly down to 115 dBm...

Page 36: ... working properly start analog mode trouble shooting GSM850 Figure 18 Fault finding chart Apply signal to ext antenna connector f 881 46771 MHz ch 189 unmodulate level 80dBm Check signal level at RX I Q J808 J809 J818 J819 OK GSM850 RX is OK Not OK Check signal level at diplexer Z908 input Replace external antenna connector X900 Not OK OK Check signal level at duplex filter Z906 input Replace dipl...

Page 37: ...UI in Phoenix Maintenance GSM RSSI Meas 3 Set Band to GSM850 and Rx Tx channel to 189 Check signal level at RX band filter Z801 input Check V R 4 supply and components if these ok replace Safari N801 Not OK OK Check signal level at mix1_A input Replace RX band filter Z801 Not OK OK Check signal level at IF filter Z804 input 133 2 MHz Not OK OK Check signal level at IF filter Z804 output 133 2 MHz ...

Page 38: ...eral dB s lower go to Step 2 Local oscillator checking Step 2 Local oscillator checking Carrying out this step VCO signal of 1st and 2nd mixers can be checked 2nd mixer RX VHF VCO frequency is constant 266 4 MHz but for the 1st mixer UHF VCO frequency depends on the channel The UHF VCO frequencies for the 1st mixer are Channel 128 2004 8 MHz Channel 189 2029 2 MHz Channel 251 2054 0 MHz 1 Set phon...

Page 39: ...below Figure 21 RX VHF VCO signal level and frequency 4 Set spectrum analyzer settings as following Center frequency 266 4 MHz Span 200 kHz RBW 3 kHz reference level 0 dBm 5 Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO signal level and frequency 6 Set Rx Tx channel to 189 using Phoenix 7 Set spectrum analyzer settings as following Center frequency 2029 2 MHz Span 200 ...

Page 40: ...d frequency 2029 2 MHz Figure 22 UHF VCO 9 Repeat measurement for channels 128 and 251 Step 3 RX chain checking 1 Set signal generator frequency to 881 46771 MHz and level to 80 dBm 2 Set phone receiver to continuous mode with full gain using Phoenix Figure 23 RF controls 3 Connect oscilloscope probe to one of the RX I Q test points on PWB all four testpoints J808 J809 J818 and J819 are located be...

Page 41: ...ncy is something else than 67 71 kHz 3 kHz you may try to change AFC value 1024 1023 and see does it have effect to the frequency Frequency should be tuned to target value with the AFC value of 100 If the signal amplitude and frequency in all testpoints is correct and signal amplitude changes when the LNA MIX2 and BB gains are changed RX chain is OK If the signal amplitude in all testpoints is too...

Page 42: ... of either 2nd mixer or AGC blocks inside Safari If the IF signal level is correct at the filter input but not at the output side the fil ter shall be replaced with new one If the IF signal level is not correct at the filter input side and the local oscillators are functioning properly inductors L814 and L815 should be checked as well If they are OK and there is a signal at the input of the 1st mi...

Page 43: ...nna connector f 1960 029 MHzch 1000 unmodulate level 50dBm Check signal level at RX I Q J808 J809 J818 J819 OK TDMA1900 RX is OK Not OK Check signal level at diplexer Z908 input Replace external antenna connector X900 Not OK OK Check signal level at duplex filter Z962 input Replace diplexer Z908 Not OK OK Check signal level atLNA V804 input Replace duplex filter Z962 Not OK OK Check signal level a...

Page 44: ...ss Write Init 4 Set spectrum analyzer settings as following Center frequency 268 08 MHz Span 200 kHz RBW 3 kHz reference level 0 dBm 5 Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO signal level and frequency Signal level should be around 25 dBm and frequency 268 08 MHz 6 Set spectrum analyzer settings as following Center frequency 2094 06 MHz Span 200 kHz RBW 3 kHz ref...

Page 45: ...CCS Technical Documentation Troubleshooting RH 13 Issue 1 11 02 ãNokia Corporation Page 45 MHz 8 Repeat measurement for channels 2 and 1998 G802 Output ...

Page 46: ...ntenna connector f 1960 06771 MHz ch 661 unmodulated level 80 dBm Check signal level at RX I Q J808 J809 J818 J819 OK GSM1900 RX is OK Not OK Check signal level at diplexer Z908 input Replace external antenna connector X 900 Not OK OK Check signal level at duplex filter Z962 input Replace diplexer Z908 Not OK OK Check signal level atL NA V 804 input Replace duplex filter Z962 Not OK OK ...

Page 47: ...Z802 Not OK OK Check signal level at IF filter Z804 input 133 2 MHz Not OK OK Check signal level at IF filter Z804 output 133 2 MHz Not OK OK Replace IF filter Z804 Check signal level at RX I Q J808 J809 J818 J819 Not OK OK Start synthesizer troubleshooting Replace Safari N801 OK Check UE M and start baseband troubleshooting Start synthesizer troubleshooting OK Not OK Check components L 815 L 814 ...

Page 48: ...ce GSM RSSI Meas 3 Set Band to GSM1900 and Rx Tx channel to 661 Figure 29 GSM RSSI Measurement If the cable losses are calibrated correctly the RSSI reading should give reasonable result 80 dBm 2 dB Please note that RSSI result is valid only if there has not been RX calibration attempts for the faulty phone If the RSSI level is several dB s lower go to Step 2 Local oscillator checking Step 2 Local...

Page 49: ...requency 266 4 MHz Span 200 kHz RBW 3 kHz reference level 0 dBm 3 Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO signal level and frequency The result should be like in the picture below Figure 31 RX VHF VCO signal level and frequency 4 Set Rx Tx channel to 661 using Phoenix 5 Set spectrum analyzer settings as following Center frequency 2093 2 MHz Span 200 kHz RBW 3 kHz...

Page 50: ...ect spectrum analyzer probe to the UHF VCO output and record signal level and frequency Signal level should be around 5 dBm and frequency 2093 2 MHz The result should be like in the picture below Figure 32 UHF VCO signal level and frequency 7 Repeat measurement for channels 512 and 810 G802 Output ...

Page 51: ...e to one of the RX I Q test points on PWB all four testpoints J808 J809 J818 and J819 are located behind display 4 Measure frequency and peak to peak voltage of RX I Q signal from each test points Signal should look like in the picture below Figure 34 RX I Q signal If only one or two testpoints shows correct signal and rest of the testpoints are either deaf or signal is very small the fault is pro...

Page 52: ...ain using Phoenix see figure 33 RF controls in step 3 4 Connect spectrum analyzer probe to the output of GSM IF filter at the one end of R804 and record the level 5 Connect spectrum analyzer probe to the input of GSM IF filter at the one end of R803 and record the level If the IF signal levels are according to the picture below and local oscillators are OK see step 2 Local oscillator checking but ...

Page 53: ... component change tune the phone with Phoenix auto tune SW AMPS TDMA Start Phoenix software and select TX mode under testing AMPS DAMPS or TDMA1900 It is useful to select mid channel 383 for AMPS DAMPS or 1000 for TDMA1900 and power level 2 Select random data for digital mode of operation GSM850 Start Phoenix software and select GSM RF Control Band GSM850 Active unit TX PL7 Ch189 and TX data type ...

Page 54: ...river BPF PA Power detector Duplex filter Diplexer EXT RF connector Antenna The power detection and power control circuit belongs under power control part of this guide Figure 36 TX signal path 213 2 MHz 214 08 MHz DIV 2 800MHz 1900MHz D E T VHF VCO 178 2 MHz 179 04 MHz UHF PLL 2G 2 2063 4 2124 MHz HB 1003 08 1028 01 MHz LB 1900MHz 800MHz VHF PLL 356 4 MHz 358 08 MHz 426 4 MHz 428 16 MHz 800 D I P...

Page 55: ... for transmitter AMPS Start Phoenix software and set phone to the Analog mode Set channel 383 and Power level 2 Connect RF cable to Ext RF connector and connect cable to Spectrum analyzer input and measure RF level Please notice insertion loss of the cable and attenuations Figure 37 RF Test Figure 38 RF controls ...

Page 56: ...015 53MHz L979 L980 and TX VHF 358 08 MHz N811 Start synth troubleshooting Check supply voltages VR2 VBATTRF VR5 IPA1 BANDSEL TX_ENABLE TX_GAIN_CONTROL NOK OK Check UEM and UPP Baseband NOK OK Check UEM Baseband Check TXi q signals Test points J810 J811 OK Check TX IF power 179 04 MHz C931 C932 Input 17 dBm 3 6 dB Check TX RF 836 49 MHz output power U C output RF 5 dBm 6dB NOK Change SAFARI N801 N...

Page 57: ...850 Itot 170 300 mA Check TX SAW input and output power IL 3 dB OK Is Itot 680 1000 mA Check PA output power and gain Output power 28 dBm Gain 30 dB Change PA N901 Check PWRDET N900 insertion loss IL 0 3 dB NOK OK Change PWRDET N900 NOK OK Change Z906 or Z908 or RF connector Check duplexer Z906 diplexer Z908 and RF connector X900 Dupl IL 2 2 dB Dipl IL 0 35 dB RF conn 0 1 dB OK Start Power control...

Page 58: ...nsmitter chain is exactly same as the AMPS mode except for the IPA current and thus it is important that the AMPS circuitry has no faults TDMA1900 GSM1900 TDMA1900 and GSM1900 mode and DAMPS mode have a common RF modulator and thus it is important that DAMPS mode have no faults Figure 40 TDMA1900 Figure 41 GSM1900 ...

Page 59: ...VBATTRF VR6 IPA2 BANDSEL TX_ENABLE TX_GAIN_CONTROL NOK OK Check UEM and UPP Baseband NOK OK Change SAFARI N801 or Z901 Check TX IF input power TDMA 214 08 GSM 213 2 MHz C931 C932 IF 12 dBm 6 6 dB OK Check TX RF TDMA 1879 98 GSM 1880 MHz U C output power Z961 input TDMA 4 dBm 6dB GSM 8 dBm 6dB Check Z961 input and output power IL 3dB NOK 1 Check Z960 input and output power IL 3dB 2 Change U C N902 ...

Page 60: ...put power and gain Gain 30 dB Pout TDMA 29 dBm GSM 32 dBm Change PA N901 Check PWRDET N900 insertion loss IL 0 3 dB Change PWRDET N900 Check duplexer Z962 diplexer Z908 and RF connector X900 insertion loss Dupl IL 2 2 dB Dipl 0 35 dB RF conn 0 1 dB Change Z962 or Z908 or RF connector Start Power control troubleshooting NOK OK NOK OK NOK OK ...

Page 61: ... TDMA TXPWRDET values can be checked with Phoenix autotuning Table 3 TYPICAL DETECTED VOLTAGES AT POWER LEVELS PL2 PL10 800A 800D 1900 D Pout TXPWRDET Pout TXPWRDET Pout TXPWRDET PL dBm dac mV dBm dac mV dBm dac mV 2 25 7 450 27 3 27 3 503 3 23 3 301 23 3 23 3 304 4 19 3 179 19 3 19 3 182 5 15 3 107 15 3 15 3 105 6 11 1 60 11 1 11 1 57 7 7 0 33 7 0 7 0 30 8 3 0 18 3 0 15 9 1 0 8 1 0 6 10 5 0 3 5 0...

Page 62: ... TDMA values are OK NOTE DAC VALUES MAY VARY ABOUT 20 NOTE TXPWRDET is difference between TX on burst and off burst Table 4 Typical detected voltages at power levels PL0 PL19 Pout TXPWRDET Pout TXPWRDET U_value PL dBm dac mV dBm dac mV 0 29 5 1 28 2 26 3 24 4 22 5 20 6 18 7 29 5 16 8 27 14 9 25 12 10 23 10 11 21 8 12 19 6 13 17 4 14 15 2 15 13 0 16 11 17 9 18 7 19 5 ...

Page 63: ...range for 2GHz UHF VCO is 2004 8 2124 MHz The output frequency range for the lower band is from 2006 16 to 2056 02 MHz in TDMA and from 2004 8MHz to 2054 in GSM In TDMA upper band the output frequency range is from 2064 12 MHz to 2124 MHz and GSM 2063 40 to 2123 MHz BB PLL frequencies are in TDMA 77 76 MHz and in GSM 78 MHz It is a practical way to check out synthesizer status by measuring the con...

Page 64: ...Documentation Page 64 ãNokia Corporation Issue 1 11 02 Figure 44 Fault finding chart for 19 2 MHz oscillator START HERE Is VCTCXO oscillating 19 2MHz 1 Check voltage C867 2 78 V Check resistor R816 1 No OK No OK 2 Change VCTCXO 2 No OK OK ...

Page 65: ...ided for Phase detector and RX parts Before I Q modulator frequency is divided by 2 Fault finding chart for RX VHF VCO Note Measure oscillator frequency over L818 coil Don t connect probe to pads AMPS TDMA RX VHF frequency 268 08 MHz GSM RX VHF frequency 266 4 MHz Figure 45 Fault finding chart for RX VHF VCO 1 START HERE Is oscillator locked to TDMA 268 08 or GSM 266 4 MHz OK Yes 2 Check resonator...

Page 66: ...quencies 77 76 MHz in TDMA mode and 78 MHz in GSM mode Next picture shows BB PLL working Figure 46 BB PLL Freq Phase comparator Charge Pump Divider 324 or 325 Divider 4 or 6 Loop Filter Varactor Resonator Active part BB VCO Divider 65 or 80 VCTCXO 19 2 MHz RF IC RFCLK to BB GSM 13 MHz TDMA 19 44 MHz Data Data are related to vctcxo frequency and mode selections ...

Page 67: ...over L829 coil Don t connect probe to pads TDMA BB PLL frequency 77 76 MHz GSM BB PLL frequency 78 MHz Figure 47 Fault finding chart for BB PLL 1 START HERE Is oscillator locked to TDMA 77 76 or GSM 78 MHz OK Yes 2 Check resonator components V805 C855 L829 and C893 3 Check loopfilter components C878 R834 C881 R835 C882 2 No OK 3 No OK 4 Change SAFARI No OK ...

Page 68: ...or Fault finding chart for TX VHF VCO AMPS CH383 TX VHF frequency 358 08 MHz TDMA1900 CH1000 TX VHF frequency 428 16 MHz GSM850 CH189 TX VHF frequency 356 4 MHz GSM1900 CH661 TX VHF frequency 426 4 MHz Figure 48 Fault finding chart for TX VHF VCO 1 START HERE Is oscillator locked to 356 4 358 08 426 4 or 428 16 MHz OK Yes 3 Check resonator components V802 C850 L820 C874 C865 4 Check components C85...

Page 69: ...ency is fed straight to mixers In lower band case AMPS TDMA800 and GSM850 2 GHZ UHF VCO frequency signal is first divided by 2 inside SAFARI and then that divided signal is fed to mixers The output frequency of the VCO depends on the DC control voltage which is controlled by PLL circuit inside SAFARI Figure 49 Fault finding chart for UHF SYNTHESIZER START HERE Is frequency locked 2004 8 2124 MHz I...

Page 70: ...X tunings AFC Tuning Purpose of the tuning is to correct phone frequency error If AFC tuning fails it might be fue to Problems with lower band signal path synthesizer etc If AFC DAC tuning value or step size is too low or high it might be due to faulty VCTCXO component UEM UPP RX LP and AMP2 filter tunings Tuning results are only visible after an unsuccessful auto tune procedure ...

Page 71: ... a lot of attenuation If it fails there can be following problems Rx chain is totally deaf or some gain is missing start receiver troubleshooting LB RX AGC tuning LB TDMA minimum gain around 2 dB measured when lna is switched off LB LNA gain step measured when lna is switched on Result is gain difference between lna on and off around 20 dB If LB TDMA minimum gain is lower than 2 dB further analysi...

Page 72: ...band Low band Purpose is to tune high channel power ch991 and low channel power ch799 equal to mid channel power ch383 Upper band Purpose is to tune high channel power ch2 and low channel power ch1998 equal to mid channel power ch1000 Crossband tuning is done only with PL2 If tuning fails there can be following problems Broken component PA Safari up converter some filters Missing components GSM RF...

Page 73: ...eference gain around 74 dB measured when lna is switched off UB LNA gain step measured when lna is switched on Result is gain difference between lna on and off around 21 dB If it fails there can be following problems Rx chain is totally deaf or some gain is missing start receiver troubleshooting GSM LB LNA GAIN AND RSSI OFFSET UB GSM reference gain around 77 dB measured when lna is switched off UB...

Page 74: ...owing problems Please check that all components are ok and in place around rx parts Please check that filters are ok GSM TX tunings If some TX tuning fails start always TX troubleshooting TX IQ Purpose of this tuning is to tune DC offset and phase offset so low as possible Typical values Amplitude 45 to 55 dBc and Phase 50 to 60 dBc If tuning fails there can be following problems UEM or Safari Too...

Page 75: ...SALIERI This document has been done to get exact information of defect PA In case is excessive current consumption is found during normal trouble shooting follow this trouble shoot ing instructions to find out if the reason is PA If the failure is due to PA change the PA and replace the removed components if the short is on VBATT line the current consumption goes to maximum provided from the power...

Page 76: ... Yes N901 850 VCC1 VCC2 short Yes N901 1900 VCC1 VCC2 short Yes Yes No No No No Put the phone PWB in the module jig MJS 17 and check if phone takes too much current Do not power on Remove Coil L903 Current 100mA Remove Coil L905 Current 100mA Remove Coil L977 Current 100mA Remove Coil L978 Current 100mA PA OK Check UEM BB troubleshoot Report to additional notes ...

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