CCS Technical Documentation RH-13 Series Transceivers Troubleshooting Issue 1 11/02 ãNokia Corporation
RH-13 Troubleshooting CCS Technical Documentation Contents Page No Transceiver Troubleshooting ......................................................................................... 5 General about testing ...................................................................................................5 Phone operating modes ............................................................................................. 5 Measurement points ..............................................................
RH-13 Troubleshooting CCS Technical Documentation General instructions for TX troubleshooting .............................................................53 AMPS/TDMA ......................................................................................................... 53 GSM850 .................................................................................................................. 53 GSM1900 ....................................................................................................
RH-13 Troubleshooting Fig 14 Fig 15 Fig 16 Fig 17 Fig 18 Fig 19 Fig 20 Fig 21 Fig 22 Fig 23 Fig 24 Fig 25 Fig 26 Fig 27 Fig 28 Fig 29 Fig 30 Fig 31 Fig 32 Fig 33 Fig 34 Fig 35 Fig 36 Fig 37 Fig 38 Fig 39 Fig 40 Fig 41 Fig 42 Fig 43 Fig 44 Fig 45 Fig 46 Fig 47 Fig 48 Fig 49 Fig 50 Fig 51 Fig 52 Page 4 CCS Technical Documentation Receiver block diagram ............................................................................................30 RF Test .....................................................
RH-13 Troubleshooting CCS Technical Documentation Transceiver Troubleshooting General about testing Phone operating modes Phone has three different modes for testing/repairing phone. Modes can be selected with suitable resistors connected to BSI- and BTEMP- lines as following: Table 1: Mode selection resistors Mode BSI- resistor BTEMP- resistor Normal 68k 47k Local 560_ (<1k_) What ever Test 3.3k (> 1k) 560_ (<1k_) Remarks Recommended with baseband testing.
RH-13 Troubleshooting CCS Technical Documentation Measurement points Figure 1: UEM regulator's filter capacitors VR1B VR1A VCORE VFLASH VFLASH VANA VR6 VR4 VR2 UEM VR7 VR3 VR5 VSIM VIO Page 6 ãNokia Corporation Issue 1 11/02
RH-13 Troubleshooting CCS Technical Documentation Figure 2: BB testpoints FLASH Issue 1 11/02 CbusDA CbusENX CbusCLK Fbus TX DbusENX FbusRX MbusTX MbusRX SLEEPCLK UEMINT SLEEPX PURX DbusCLK DbusDA UEM RFCLK: Init clk 19.
RH-13 Troubleshooting CCS Technical Documentation Baseband Troubleshooting Note: ESN and IMEI has to re-written to phone If UEM is replaced. This can be done only in Central Service.
RH-13 Troubleshooting CCS Technical Documentation •Hw "core" regulators "on": Vio, Vcore, VR3, Vflash1 •These regulators are supplying the processors, memory, chip interfaces and clock source in RF • Reset releasing delay •Supply voltages stabilize to their UEM hw default values •RFCLK grows to full swing •Core is ready to run but waiting for PURX release • Reset releasing •UPP releases the SLEEPX up to "non sleep" -state to prevent the UEM switching the regulators "OFF" MCU starts running the Bootstr
RH-13 Troubleshooting CCS Technical Documentation Figure 3: Power up sequence 1 Power key pressed • After 20ms UEM enters RESET MODE if VBAT>Vmstr+ 2 2) VFLASH1, Vana, Vcore, Vio and VR3 goes high. Page 10 • VCTCXO enabled by VR3 -> RFClk 19.2 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.
RH-13 Troubleshooting CCS Technical Documentation Phone does not start up normally or does not stay on Note! In case of power up faults, it's not possible to force phone on by disabling watchdog. 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.
RH-13 Troubleshooting CCS Technical Documentation Figure 4: Fault tree, phone does not power up Try to start phone to test or local mode Check the power key OK OK FAIL Measure Vflash1,Vana,Vio,Vcore ,VR3 when pwr key pressed OK Check R202, R203, R205, C217, C220 OK FAIL Check X101,C108, C109,Z101 VR3 missing Check G801 (missing, misaligned) FAIL Measure VBAT from C262 Check 13MHz /GSM or 19.44/TDMA RF-clock from C420 FAIL Check C420 OK OK OK Check that purx goes up to 1.
RH-13 Troubleshooting CCS Technical Documentation •FBUSTX(serial data to phone), •FBUSRX(serial data from phone), •MBUS(serial clock for FBUSRX) •VPP(External flashing voltage for speed up flashing) • Also BSI line is used when initializing flashing (battery connector) • When phone is powered (VBAT>3V ) MBUS and FBUSTX lines are pulled up internally by phone. • Prommer sends command to UEM, using FBUSRX, to enter Flash-mode.
RH-13 Troubleshooting CCS Technical Documentation Flash programming error codes Error codes can be seen from "FPS-8 Flash" in Phoenix. Underlined note means that item under consideration is being used first time in flashing sequence. Table 2: Flash programming error codes Error Description Not working properly C101 "The Phone does not set FbusTx line high after the startup." Vbatt Vflash1 Vcore VIO BSI and FbusRX from prommer to UEM.
RH-13 Troubleshooting CCS Technical Documentation C384 C584 C684 "The Phone has generated NAK signal during data block transfer." (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.
RH-13 Troubleshooting CCS Technical Documentation Charging Note: Charging voltage and current can be checked by connecting phone to service software and reading ad- converter values of vchar and ichar.
RH-13 Troubleshooting CCS Technical Documentation 3 In case of internal microphone/XEAR fail: Feed tone to microphone and 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 connect 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.
RH-13 Troubleshooting CCS Technical Documentation Earpiece or external microphone line does not work Figure 6: Fault tree, earpiece fail Earpiece doesn't work Run audio-loop selftest with phoenix Fail Feed 1KHz to Xmic by JBA-8 and measure from earpiece OK OK Fail Check R157,L152, L158,C150,C164, C153, C165,R152, C156,C155,R164, R161,R153,R150, C159,C167,V153 OK Check earpiece Change UPP OK Change UEM Page 18 ãNokia Corporation Issue 1 11/02
RH-13 Troubleshooting CCS Technical Documentation Microphone or XEAR does not work Figure 7: Fault tree, microphone fail Microphone doesn't work Run audio-loop selftest with phoenix Fail Feed 1KHz to Mic and measure from Xear by JBA-8 Ok Ok Fail Check C151,C152,C157,L151,C162, C168,C169,R156,R162,R166, R159,C154,C158,C161,C166, R163,L159,V152 Ok Check microphone Change UPP Ok Change UEM Issue 1 11/02 ãNokia Corporation Page 19
RH-13 Troubleshooting CCS Technical Documentation Accessory detection • - Start phone to normal mode when checking accessory detection. • - Ad- converter value of headint and hookint - lines can be checked with Phoenix ADC-reading. • - When headset HDC-9 connected and headset push button is held down, headint- value should be between 10 and 50 and hookint- value between 0-30.
RH-13 Troubleshooting CCS Technical Documentation Power supply for data cable DLR-3 needs power supply for data transfering. SGND will supply 2.8V to DLR-3. - Start phone to normal mode when checking DLR-3 detection Figure 9: Fault tree, data cable. DLR-3 data cable doesn't work Connect DLR-3, check DLR-3 detection Fail Check the components of XMIC, HEADINT and MICB2 lines Ok Check bottom connector Ok Check VFlash2 (~2.8V) Fail OK Check SGND voltage from Ok bottom connector (2.40-2.
RH-13 Troubleshooting • CCS Technical Documentation Phone clock (on display) does not function properly Figure 10: Fault tree, sleep clock Sleep mode not working Measure sleep clock from J404 Page 22 Fail Measure sleep clock from B200 Fail Check C203 &C204 Ok Ok Ok Change UPP (D400) Change UEM (D200) Change B200 ãNokia Corporation Issue 1 11/02
RH-13 Troubleshooting CCS Technical Documentation Display/Keyboard lights do not work Figure 11: Fault tree, Display/Keyboard lights Display/Keyboard lights are not working Check R300 (Display) and R301 (Keyboard) FAIL Replace resistor(s) FAIL Replace LED(s) FAIL Replace UEM OK Check LEDs V300...V303,V310-V311 (Display) and V304...
RH-13 Troubleshooting CCS Technical Documentation Display does not work Figure 12: Fault tree, display Display does not work Check that phone powers up norm ally (current consumption, power up sequence) In any phase of display troubleshooting use Display Test in Phoenix to produce test patterns on display. FAIL Proceed to phone doesn't power up troubleshooting Also check with a known good display module to see if it works.
RH-13 Troubleshooting CCS Technical Documentation No sound: Try using known good buzzer instead. If still no sound ->change UEM(D200) Weak sound: Use Audio test in Phoenix to set buzzer parameters(frequency, strength). If it doesn't effect to the sound level ->change buzzer. Vibra does not work Check spring connectors and C307. No vibration: Try using known good vibra instead.
RH-13 Troubleshooting CCS Technical Documentation Infrared does not work Figure 13: Fault tree, infra red Infra Red not working Measure Vflash1 from IR module VCC(pin6), should be 2.78V FAIL Change UEM(D200) FAIL Replace faulty component(s) OK Check R350, R351, C351 and V350 OK Use ST_IR_LOOP_TEST(in BB Self Tests) in Phoenix OK FAIL Measure Tx Data from IR module(pin3) 2.78V, 9.6/115.
RH-13 Troubleshooting CCS Technical Documentation RF troubleshooting Repairing instructions for RF Unit Introduction Measurements should be done using spectrum analyzer and high-frequency probe (Local and reference frequencies and RF-power levels in intermediate stages of chain). Oscilloscope is used to measure DC-voltages and low frequency signals. Multimeter is also useful measurement equipment in faultfinding. Also cellular tester is needed in order to perform tests mentioned in this document.
RH-13 Troubleshooting CCS Technical Documentation Abbreviations in fault finding chart AF: Audio Frequency BB Base band BPF Band pass filter f: Frequency of signal (measured with spectrum analyzer) HB High 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
RH-13 Troubleshooting CCS Technical Documentation Receiver General instructions for RX troubleshooting Receiver troubleshooting is divided into three sections: - General checking - Local oscillator checking - RX Chain checking Faultfinding 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.
RH-13 Troubleshooting CCS Technical Documentation Path of the received signal Block level description of the receiver: Figure 14: Receiver block diagram Diplex filter 850 / 1900 1930 ... 1990 MHz 133.2 MHz kHz BW200 869 ... 894 MHz Duplex filter 1900 MHz Duplex filter 850 MHz LNA LNA 1900 850 Band filter Band filter 1st mixer 1st mixer 134.04 MHz BW30 kHz GSM ch filter AGC TDMA SAFARI GTE AGC 25/20 dB 1 step 2063.4 ... 2124 MHz UHF LO 1002.4...1028.
RH-13 Troubleshooting CCS Technical Documentation AMPS Fault finding chart A pply signal to ext. antenna connector f= 881.4 MH z (ch 380) mod.= 1004 H z dev.= 8 kH z level= -116 dB m C onnect audio box from the bottom connector to audio analyzer SINA D > 12 dB A MPS R X is O K SINA D < 12 dB A pply signal to ext. antenna connector f= 881.
RH-13 Troubleshooting CCS Technical Documentation Step 1. General checking C heck signal level at R X band filter Z 801 input Not O K C heck V R 4 supply and components if these ok => replace Safari N801 OK Not O K C heck signal level at mix1_A input OK C heck signal level at IF filter Z 803 input (134.04 MH z) Not O K R eplace R X band filter Z 801 Measure V R 4 from L 812 and L 811pads OK Not O K OK OK C heck components L 812, R eplace Safari N801 L 811 etc.
RH-13 Troubleshooting CCS Technical Documentation 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.
RH-13 Troubleshooting CCS Technical Documentation 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 268.08 MHz but for the 1st mixer UHF VCO frequency depends on the channel. The UHF VCO frequencies for the 1st mixer are: Channel 991: 2006.16 MHz Channel 380: 2030.88 MHz Channel 799: 2056.02 MHz 1 Set signal generator frequency to 881.4091125 and level to -80 dBm.
RH-13 Troubleshooting CCS Technical Documentation • RBW: 3 kHz, reference level: 10 dBm 7 Connect spectrum analyzer probe to the UHF VCO output and record signal level and frequency. Signal level should be around -5 dBm and frequency 2030.88 MHz. Output G802 8 Repeat measurement for channels 991 and 799. Step 3. RX chain checking 1 Set signal generator frequency to 881.4091125 and level to -50 dBm. 2 Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Testing => RF Test).
RH-13 Troubleshooting CCS Technical Documentation TDMA800 Since there is same physical signal path for both analog (AMPS) and digital modes (TDMA/GSM) in lower band there is no need for additional troubleshooting in digital modes. If digital mode in lower band is not working properly start analog mode troubleshooting. GSM850 Figure 18: Fault finding chart. Apply signal to ext. antenna connector f= 881.
RH-13 Troubleshooting CCS Technical Documentation Step 1. General checking Figure 19: General checking. Check signal level at RX band filter Z801 input Not OK Check V R 4 supply and components if these ok => replace Safari N801 Not OK Replace RX band filter Z801 OK Check signal level at mix1_A input OK Check signal level at IF filter Z804 input (133.
RH-13 Troubleshooting CCS Technical Documentation Figure 20: 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 oscillator checking Carrying out this step VCO signal of 1st and 2nd mixers can be checked.
RH-13 Troubleshooting CCS Technical Documentation 3 Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO signal level and frequency. Signal should look like in the picture 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.
RH-13 Troubleshooting CCS Technical Documentation 8 Connect spectrum analyzer probe to the UHF VCO output and record signal level and frequency. Signal level should be around -5 dBm and frequency 2029.2 MHz. Figure 22: UHF VCO. Output G802 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.
RH-13 Troubleshooting CCS Technical Documentation 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 24: 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 probably due to Safari ASIC. • If the signal amplitude is correct but its frequency is something else than 67.
RH-13 Troubleshooting CCS Technical Documentation 3 Set phone receiver to continuous mode with full gain using Phoenix (see figure 23, 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.
RH-13 Troubleshooting CCS Technical Documentation Figure 26: Fault finding chart. Apply signal to ext. antenna connector f= 1960.
RH-13 Troubleshooting CCS Technical Documentation Channel 2: 2064.12 MHz Channel 1000: 2094.06 MHz Channel 1998: 2124.00 MHz 1 Set signal generator frequency to 1960.0230375 MHz and level to -80 dBm. 2 Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Testing => RF Test). Figure 27: RF Test. 3 Set channel to 1000 and press "Write Init". 4 Set spectrum analyzer settings as following: • Center frequency: 268.
RH-13 Troubleshooting CCS Technical Documentation MHz. Output G802 8 Issue 1 11/02 Repeat measurement for channels 2 and 1998.
RH-13 Troubleshooting CCS Technical Documentation GSM1900 Figure 28: Fault finding chart A pply signal to ext. antenna connector f= 1960.
RH-13 Troubleshooting CCS Technical Documentation C heck signal level at R X band filter Z 802 input Not O K C heck components around lna and measure supply voltages OK C heck signal level at mix1_B input Not O K R eplace R X band filter Z 802 OK C heck signal level at IF filter Z 804 input (133.2 MH z) Not O K Measure V R 4 from L 815 OK and L 814 pads Not O K OK Start synthesizer troubleshooting OK C heck components L 815, R eplace Safari N801 L 814 etc.
RH-13 Troubleshooting CCS Technical Documentation Step 1. General checking The fastest way to get overview of RX status is to measure RSSI (Received Signal Strength Indicator) level. This can be done by using signal generator and Phoenix. Note that this is useful only if the phone has been calibrated when it was OK and the malfunction have occured after tunings. 1 Set signal generator frequency to 1960.06771 MHz and level to -80 dBm.
RH-13 Troubleshooting CCS Technical Documentation 1 Set phone receiver to continuous mode using Phoenix. 2 Set spectrum analyzer settings as following: Figure 30: RF controls. • Center frequency: 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.
RH-13 Troubleshooting CCS Technical Documentation 6 Connect 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. Output G802 The result should be like in the picture below: Figure 32: UHF VCO signal level and frequency 7 Page 50 Repeat measurement for channels 512 and 810.
RH-13 Troubleshooting CCS Technical Documentation Step 3. RX chain checking 1 Set signal generator frequency to 1960.06771 MHz and level to -80 dBm. 2 Set phone receiver to continuous mode with full gain using Phoenix. Figure 33: 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 behind display) 4 Measure frequency and peak-to-peak voltage of RX I/Q signal from each test points.
RH-13 Troubleshooting CCS Technical Documentation 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. Page 52 • 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.
RH-13 Troubleshooting CCS Technical Documentation Figure 35: IF signal level. LNA gain step function can be checked by measuring signal level at L803 and turning ON and OFF the LNA using Phoenix. The gain should change by 20...30 dB. Transmitter General instructions for TX troubleshooting Always use an RF-cable connected from an external RF-connector to analyzer via (rfpower) attenuator.
RH-13 Troubleshooting CCS Technical Documentation TDMA1900, GSM1900 UEM TX I/Q DA-converters -> I/Q modulator and Digital gain step amplifier (SAFARI) -> Dual TX IF-BPF -> Up converter (Mixer -> BPF -> Driver) -> 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. 1900 UHF-PLL 2G (÷2) (2063.4-2124 MHz, HB) (1003.08-1028.
RH-13 Troubleshooting CCS Technical Documentation Fault finding charts 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.
RH-13 Troubleshooting CCS Technical Documentation Figure 39: Fault finding chart AMPS, PL2, CH383 Visual check of TX block - PA and up converter -TX SAW - Duplex filter - Passive components OK *)Check LO-signal (1015.53MHz) @L979&L980 and TX VHF (358.08 MHz)@N811 NOK Start synth troubleshooting OK Check supply voltages: VR2,VBATTRF, VR5, IPA1,BANDSEL, TX_ENABLE TX_GAIN_CONTROL NOK Check UEM and UPP (Baseband) OK Check TXi/q signals Test points J810...
RH-13 Troubleshooting CCS Technical Documentation NOK Check TX SAW input and output power IL: 3 dB Change TX SAW filter Z905 OK ****)Is Itot 680 ... 1000 mA? Check PA output power and gain. Output power: ~28 dBm Gain: ~30 dB NOK Change PA N901 OK NOK Check PWRDET N900 insertion loss IL<0.3 dB Change PWRDET N900 OK Check duplexer Z906, diplexer Z908 and RF connector X900 Dupl IL: ~2.2 dB Dipl IL: ~0.35 dB RF conn: ~0.
RH-13 Troubleshooting CCS Technical Documentation TDMA800, GSM850 The transmitter 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.
RH-13 Troubleshooting CCS Technical Documentation Figure 42: Fault finding chart TDMA1900, PL2, CH1000 GSM1900, PL0, CH661 NOK Is TDMA800 mode OK? Start AMPS troubleshooting OK Check LO-signal NOK (TDMA 2094.06 GSM 2093.2MHz)@L979&L98 0 and TX VHF (TDMA 428.16 GSM 426.4 MHz)@N811 Start synth troubleshooting OK Check supply voltages: VR2,VBATTRF, VR6, IPA2,BANDSEL, TX_ENABLE TX_GAIN_CONTROL NOK Check UEM and UPP (Baseband) OK Check TX IF input power (TDMA 214.08 GSM 213.
RH-13 Troubleshooting CCS Technical Documentation Is Itot TDMA 350...500 GSM 200 ... 300 mA? NOK Check PA output power and gain. Gain: ~30 dB Pout: TDMA ~29 dBm GSM ~32 dBm Change PA N901 OK NOK Check PWRDET N900 insertion loss IL< 0.3 dB Change PWRDET N900 OK Check duplexer Z962 , diplexer Z908 and RF connector X900 insertion loss Dupl IL ~2.2 dB Dipl ~0.35 dB RF conn ~0.
RH-13 Troubleshooting CCS Technical Documentation Power control loop Basically, the power detection is done with Power detector module and power control is done inside SAFARI. Power detection is similar for both bands, except both bands have own coupler. Figure 43: Power detection. N Is TXPWRDET vs. output power OK? See chart below. Check VR2 and PATEMP . Check C921, C922 and PWRDET module. Note ! See TXPWRDET vs. Output power curve Y N Is DAC value vs.
RH-13 Troubleshooting CCS Technical Documentation GSM850/GSM1900 GSM detected voltages and DAC values are also OK if AMPS and 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 dBm dac 0 - - 29.5 1 - - 28 2 - - 26 3 - - 24 4 - - 22 5 - - 20 6 - - 18 7 29.
RH-13 Troubleshooting CCS Technical Documentation Synthesizers There are five oscillators generating the needed frequencies for RF section. 19.2 MHz reference oscillator, 2GHz UHF VCO, TX VHF cascade amplifier VCO both RX VHF VCO and BB VHF integrated in Safari. RX VHF frequency is 268.08 MHz in TDMA and 266.4 MHz in GSM and TX VHF has four fixed frequencies, 358.08 MHz TDMA and 356.4 MHz GSM for lowband and 426.4 MHz in GSM and 428.16 MHz in TDMA upper band.
RH-13 Troubleshooting CCS Technical Documentation Figure 44: Fault finding chart for 19.2 MHz oscillator 2 Change VCTCXO OK 2.No START HERE! Is VCTCXO oscillating? 19.2MHz 1.No OK! OK 1 Check voltage C867 2.
RH-13 Troubleshooting CCS Technical Documentation RX VHF VCO The RX VHF VCO signal is used to generate receiver Intermediate frequency. RX VHF VCO has two fixed frequencies: TDMA 268.08 MHz, GSM 266.4 MHz. Operating frequency is locked in Phase locked Loop. RX VHF VCO output signal is fed to SAFARI. Inside the SAFARI signal is divided 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.
RH-13 Troubleshooting CCS Technical Documentation BB PLL The BB PLL generates RF clock to base band. It has two fixed frequencies 77.76 MHz in TDMA mode and 78 MHz in GSM mode. Next picture shows BB PLL working. Figure 46: BB PLL. VCTCXO 19.2 MHz Divider 65 or 80 * Data Freq/Phase comparator Divider 324 or 325 Charge Pump Active part Loop Filter Varactor Resonator BB VCO Divider 4 or 6 RF-IC RFCLK to BB GSM 13 MHz TDMA 19.44 MHz *Data are related to vctcxo frequency and mode selections.
RH-13 Troubleshooting CCS Technical Documentation Fault finding chart for BB PLL Note! Measure oscillator frequency 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. 4 Change SAFARI OK No 3 Check loopfilter components: C878, R834, C881, R835, C882 OK 3.No 1 START HERE Is oscillator locked to TDMA 77.76 or GSM 78 MHz 2.
RH-13 Troubleshooting CCS Technical Documentation TX VHF VCO The TX VHF VCO signal is used to generate transmitter Intermediate frequency. TX VHF VCO has three fixed frequencies 358.08 MHz for lower band and TDMA 428.16 MHz and GSM 426.4 MHz for upper band. Operating frequency is locked in Phase locked Loop and frequency is divided by two before modulator. Fault finding chart for TX VHF VCO AMPS, CH383 -> TX VHF frequency 358.08 MHz TDMA1900, CH1000 -> TX VHF frequency 428.
RH-13 Troubleshooting CCS Technical Documentation UHF SYNTHESIZER The UHF synthesizer consists of a external 2GHz UHF VCO, loop filter and integrated PLL in Safari RF-IC. Safari GTE IC contains stages like counters, prescaler, divider by two, phase and frequency comparator and a charge pump circuit which allows two operational modes analog and digital. The UHF VCO Oscillation frequency is from 2004.8 MHz to 2124 MHz In upper band (TDMA1900 &GSM1900) 2 GHz synthesizer frequency is fed straight to mixers.
RH-13 Troubleshooting CCS Technical Documentation Description of RH-13 RF auto-tune tunings TDMA RF tunings Figure 50: Auto tune TDMA TDMA RX 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.
RH-13 Troubleshooting CCS Technical Documentation - This tuning has to be done simultaneously with AFC-tuning If LP and AMP2 filter tunings fail it may be due to: - Problems with lower band signal path (synthesizer etc.) - VCTCXO component can be broken - Safari can be broken or solder joints UB RX AGC tuning - UB TDMA minimum gain (around 0 dB), measured when lna is switched off - UB LNA gain step, measured when lna is switched on.
RH-13 Troubleshooting CCS Technical Documentation - UEM or Safari - Too low output power TX power levels and crossband (TxPwr) - Purpose of this tuning is to tune all power levels (PL2 – PL10) - TX crossband: - 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).
RH-13 Troubleshooting CCS Technical Documentation 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.
RH-13 Troubleshooting CCS Technical Documentation If NTC temperature fails it might be due to: - Faulty NTC resistor or pull-up resistor - faulty UEM - wrong ambient temperature (phone is too hot or cold) GSM RX CROSS BAND CALIBRATION - Purpose of the calibration is to compensate gain ripple due to rx-filters over the band - This is done in UB and LB If it fails, response over the band can be very bad and there can be following problems: - Please check that all components are ok and in place around rx-par
RH-13 Troubleshooting CCS Technical Documentation - GSM1900: Purpose is to tune high channel power (ch512) and low channel power (ch810) equal to mid channel power (ch661). - GSM850: Purpose is to tune high channel power (ch128) and low channel power (ch251) equal to mid channel power (ch189). Typical values: - Low Comp Factor UB 0.5, LB 0.5 - High Comp Factor UB 1.0, LB 1.5 PA TROUBLESHOOTING FOR SALIERI This document has been done to get exact information of defect PA.
RH-13 Troubleshooting CCS Technical Documentation Figure 52: Fault finding chart Put the phone PWB in the module jig MJS-17 and check if phone takes too much current. Do not power on. Report to additional notes. Yes Remove Coil L903.Current <100mA No Remove Coil L905.Current <100mA No Remove Coil L977.Current <100mA No Remove Coil L978.Current <100mA No N901 1900 VCC3 short. Yes N901 850 VCC3 short. Yes N901 850 VCC1/VCC2 short. Yes N901 1900 VCC1/VCC2 short. PA OK. Check UEM = BB troubleshoot.
