PAMS Technical Documentation NSW-4 Series Transceivers Disassembly & Troubleshooting Issue 1 Final Draft 08/00 Nokia Mobile Phones Ltd.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation AMENDMENT RECORD SHEET Amendment Date Number 08/00 Page 2 Inserted By Comments OJuntune Issue 1 Nokia Mobile Phones Ltd.
PAMS Technical Documentation NSW-4 Disassembly & Troubleshooting CONTENTS Page No Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Baseband Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Phone is totally dead . . . . . . . . . .
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation TDMA1900 UPCONVERTER N980 . . . . . . . . . . . . . . . . . . . TDMA1900 PLL–circuit N870 . . . . . . . . . . . . . . . . . . . . . . . . Warranty transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4 Nokia Mobile Phones Ltd.
PAMS Technical Documentation NSW-4 Disassembly & Troubleshooting Disassembly 1. Remove battery 2. Remove the antenna cover by using the ART–9 antenna removal tool. Place the ART–9 flat side down in the battery recess of the phone in the top left hand corner. The extruding ”finger” slides in the hole next to the battery springs and when pushing the tool the antenna is released for removal Issue 1 Final Draft 08/00 Nokia Mobile Phones Ltd.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation 3. Remove screws from the back of the phone. 4. Open covers. Page 6 Nokia Mobile Phones Ltd.
PAMS Technical Documentation NSW-4 Disassembly & Troubleshooting 5. Remove shield screws (2 pcs) 6. Remove shield. Issue 1 Final Draft 08/00 Nokia Mobile Phones Ltd.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation 7. Remove main PWB 8. Remove keyboard spacer. Page 8 Nokia Mobile Phones Ltd.
PAMS Technical Documentation NSW-4 Disassembly & Troubleshooting 9. Remove UI board 10. Separate parts from cover. Issue 1 Final Draft 08/00 Nokia Mobile Phones Ltd.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Baseband Testing The MCU software enters a local mode at start-up if suitable resistors are connected to the BTEMP and BSI lines. NOTE! Baseband doesn’t wake up automatically when the battery voltage is connected. Power must be switched on via: 1. Pwr key or 2. BTEMP line or 3. Charger 4.
PAMS Technical Documentation NSW-4 Disassembly & Troubleshooting Trouble Shooting The following hints should facility finding the cause of the problem when the circuitry seems to be faulty. This trouble shooting instruction is divided following section. 1. Phone is totally dead 2. Flash programming does not work 3. Power does not stay on or the phone is jammed 4. Display information: Contact Service 5. Phone does not register to the network or phone does not make a call. 6. Audio fault. 7.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Phone is totally dead This means that phone doesn’t take current at all when the power switch is pressed or when the watchdog disable pin (X101 pin 11 or J150) is grounded. Used battery voltage must be higher than 3.0 V. Otherwise the hardware of CCONT (N150) prevents totally switching power on. Here the VBat is set to 3.6V Phone is totally dead YES NO VBat=3.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Flash programming doesn’t work The flash programming is carried out via the pads accessible from the back of the phone (using service accessories). Flash programming doesn’t work YES VBAT > 3.0 V VBB (C166) 2.8 V VR1 (C158) 2.8 V NO See section ”Phone is totally dead” YES PURX (J140) master reset=”1”(2.8V) NO Sleep clock SLCLK (J157) square wave 32 kHZ YES YES FLASH (D201) VBB is 2.8V (C203), SRAM (D200) VBB is 2.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Power doesn’t stay on or the Phone is jammed If this kind of fault has come after flash programming, there are most probably open pins in ICs. The solder joints of ICs: MAD1 (D202), Flash (D201) and SRAM (D200) are to be checked at the extent possible (by microscope from the side of PCB and lightly pressing components while switching power on).
PAMS Technical Documentation NSW-4 Disassembly & Troubleshooting The phone doesn’t register to the network or phone doesn’t make a call If the phone doesn’t register to the network or the phone doesn’t make a call, the reason could be either the baseband or the RF part. The phone can be set to wanted mode by WinTesla service software and determinate if the fault is in RF or in baseband part (RF interface measurements).
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Phone doesn’t register to the network or phone doesn’t make a call YES Analog supply voltage VR6 is > 2.7 V of NO Check N250 NO Check R256 Cobba (N250) at C275 YES Analog reference voltage Vref is 1.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Charging failure Nothing happens when charger is connected YES Voltage level at VCHAR–pin of CCONT is Check X102, R158, R160, F150 NO higher than 0.17 V when charger is connected YES Check N150 Display Information: Not charging YES Voltage level at C165 is about 0.8 V when power is connected BSI resistor value should be 18 k Check R158, R163 NO YES Voltage level at C168 is about 0.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation RF Troubleshooting Introduction Measurements are done using a spectrum analyzer and a high–frequency probe (Local and reference frequencies and RF–power levels in intermediate stages of TX/RX–chains). An oscilloscope is used to measure DC–voltages and low frequency signals. A multimeter is also a useful measurement instrument in fault finding.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation AAX–2 Abbreviations used BB Baseband f Frequency of signal (measured with spectrum analyzer) IF Intermediate Frequency LO Local Oscillator P Power of signal in decibels compared to a milliwatt (dBm) (measured with spectrum analyzer) PA Power Amplifier PCB Printed Circuit Board PLL Phase Locked Loop RF Radio Frequency RX Receiver T Time (between pulses) TX Transmitter UHF Ultra High Frequency V Voltage of signal (m
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Interface signals between RF and BB/DSP Signal name From To Parameter Min Typ Max Unit Function VBAT Battery RF Voltage 3.1 3.6 5.3 V Supply voltage for RF and regulators VREF CCONT EROTUS Voltage 1.478 1.500 1.523 V Reference voltage for EROTUS RFTEMP RF CCONT Voltage 0 1.4 2.7 V HOT ROO M COLD RF temperature sensor 47k NTC to GND 2.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Signal name From To Parameter Min Logic low ”0” 0 0.2 RFC EROTUS COBBA_D Voltage/Frequency RFCEN MAD Voltage RSSI CCONT / PENTA regulator EROTUS CCONT/ Typ 0.4 / 19.44 0 Max Unit 0.8 V 1.0 Vpp / MHz Clock signal for the logic circuits 2.85 V “1” min 2.0 V “0” max 0.4 V Output level 0.1 1.
NSW-4 Disassembly & Troubleshooting Signal name From To PAMS Technical Documentation Parameter Min Typ Logic low ”0” TXLX1 TXLX2 SENA2 RXPWR1 RXPWR2 RXPWR3 SPWR1 SPWR2 SPWR3 TXPWR1 Page 22 MAD MAD MAD MAD MAD MAD COBBA_D COBBA_D COBBA_D MAD TX 800 TX 1900 2 Ghz UHF PLL CCONT PENTA PENTA CCONT CCONT PENTA CCont Max Unit Function 0.2 V PWR control loop during ramp up/down (fast mode) Logic high ”1” 2.1 2.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Signal name TXWR2 TXWR3 From MAD MAD To PENTA Parameter Min Logic high ”1” 2.0 Logic low ”0” 0 TDMA800 Logic high ”1” TX–upconverter Logic low ”0” Typ Max Function V VR12 ON , TDMA1900 TX– upconverter enable V VR12 OFF V AMPS & TDMA800 TX– upconverter enable 0.5 V TX–UC disable 0.5 2.0 0 Unit VR1 CCont RF Voltage 2.7 2.8 2.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Receiver General instructions for RX troubleshooting Start the WinTesla–software and use it to start the desired RX–mode of the mobile phone. The troubleshooting flowchart is divided into three steps, general checking, local checking and RX–chain checking. Please notice that before changing ASICs or filters, all solderings and missing components are checked.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Apply 879.00 MHz –116dBm , 8kHz dev, 1 kHz sine signal to the antenna pad Connect EXT HS to audioanalyzator, open audio AF: 1 kHz sine signal, meas SINAD AF: >12 dB N Y AMPS RX–chain OK N N Check UHF Vcnt at C822 V: 2.0 ..3.5 V Start synthesizer troubleshooting Y N Check 3 multiplier output level C745 N700 V: >80 mVpp ? Start synthesizer troubleshooting Y Apply 879.00 MHz –50dBm , sine signal to antenna pad.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Note! Check input of EROTUS IF ampli– fier at R744 N Check all components around filter Change Z741 P:≅–55dBm Y Note ! Check LIMIN1 level at C768 N Check comp. R764 &C769 Check voltages around EROTUS Y N Check LIMOUT1 output R788 : >300 mVpp Change EROTUS Y Note ! N Check COBBA_D IF2A input at R774 Check comp. R788 , R789, L750, C780 and R774 Inductor L750 is not reciprocal, i.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Apply 879.00 MHz –50dBm signal to antenna interface NOTE! If AMPS RX check is OK, then only components in AGC1, OUT_rx, IN_rxif and OUT_rxif –lines needs to be checked. Y Check RF level of COBBA_D TDMA800 RX–chain OK N N N Check UHF VCO PD2 V: 2.0...3.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation TDMA800 continued Check input of EROTUS IF amplifier at R744 Note! N Check all components around filter Change Z741 Y Note! Check INP_rxif level at R763 N Change Filters Z750 Check all components around filters &Z751 Y Check OUTP_rxif level at R798 Change capacitors N C750 & C751 Change EROTUS Note ! Check all discrete components and supply voltages of EROTUS. Check also AGC1 line.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation TDMA 1900RX NOTE! If RX800 is OK, then RX1900 troubleshooting should be concentrated only on Z960 and N721 area and surrounding components. Apply 1960.02 MHz –50dBm signal to Antenna interface Y Check RF level of COBBA_D pin no 10 TDMA1900 RX–chain is OK N N Check UHF Vcnt N V: 2.0...3.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation TDMA1900RX continued Note! Check input of EROTUS IF amplifier at R744 N Check all components around filter Change Z741 Y Note! Check INP_rxif level at R763 N Change Filters Z750 Check all components around filters &Z751 Y Check OUTP_rxif level at R798 Change capacitors N C750 & C751 Change EROTUS Note ! Check all discrete components and supply voltages of EROTUS. Check also AGC1 line.
PAMS Technical Documentation NSW-4 Disassembly & Troubleshooting Transmitter General Instructions for TX Troubleshooting Always use RF–cable connected from antenna interface to analyzer through an attenuator. This is important to protect analyzer against excessive rf–power and not to let any unwanted RF power leak to the cellular frequencies. Start the Wintesla software and select TX mode under testing (AMPS,DAMPS or TDMA1900).
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Set marker at middle of slot. Check that spectrum analyzer frequency is correct Set settings for pulse power meter Do calibration if needed. Set correct frequency Set Ref LVL offset ––> Attenuation to Antenna Pad Set correct duty cycle, 33,3 % in digital mode and 100 % at analog mode. Select Tuning –> Using WinTesla Select Tuning –> TX power –> LowBand/HighBand –>EEPROM values All four tuning channels have to be tuned.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Power level 7 8 9 10 RF Power at ext. Antenna pad 8.0 dBm 4.0 dBm –0.0 dBm –4.0 dBm Tuning target tolerance +/– 1 dB +/– 1 dB +/– 1 dB +/– 1 dB Testing Limits +/– 2.0 dB +/– 2.0 dB +/– 2.0 dB +/– 2.0 dB Check, that power level PL2 TXC DAC value is on allowed range +50...300. TDMA1900 TX output power Power level 2 RF Power at ext. Antenna pad 25.9 dBm Tuning target tolerance +/– 0.1 dB 3 4 5 6 7 8 9 10 23.0 dBm 20.0 dBm 16.0 dBm 12.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Troubleshooting diagrams for TX AMPS TX Connect an RF–cable to the antenna interface and connect the cable to a spectrum analyzer input. Start WinTesla–software and set the phone to Analog mode. Set channel 383 and Powerlevel 2 and measure RF ouput level. Please notice insertion loss of the cable and attenuations in the test jig or antenna adapter. It is recommended to use an external attenuator to avoid overloading the spectrum analyzer.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Continues from previous page Y Check TXIF Z900 Pin7 f: 161.19 MHz P: >–25 dBm Change upconverter N900 N Is Z900 Insertion loss too high? Y Change filter Z900 IL>5 dB N Check modulator output at R925 N Note! Check R925 P≅ –18dBm max check also I/Q–resistors R760 Y N Is TX I/Q OK? V: 0.8 VDC +/– 0.4 V (symmetrical) Check I&Q COBBA DACs (BaseBand) Y Change N700 Issue 1 Final Draft 08/00 Nokia Mobile Phones Ltd.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation TDMA800 TX The transmitter chain is exactly same as in AMPS–mode, but the power amplifier is biased to more linear mode, so it is important, that AMPS have no faults. N Start AMPS troubleshooting Is AMPS mode OK ? Y N Check Vbias PIN16 N903 V: > 2.8 V Check CCONT VR7_bias (BaseBand) Y Start power level tuning. Does it work? Page 36 N Change N700 and/or Cobba Nokia Mobile Phones Ltd.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation TDMA1900 TX TDMA1900 mode and DAMPS mode have common IF section and antenna circuit and thus it is important that DAMPS mode have no faults. N Is TDMA800 mode OK ? Start TDMA800 troubleshooting Y Note! N Are LO signals OK ? Start synth troubleshooting Check VHF and UHF locals including LO–buffer, measuring point for UHF is N980 pin5.
NSW-4 Disassembly & Troubleshooting Check VAPC Y PAMS Technical Documentation Check PA input Y power V:>2.5 V Change PA P:> 0 dBm N N N Check TXC Typ 1.5V@PL2 Check Z975 filter Y Change Z975 Insertion loss IL>4dB N Y Start powercontrol troubleshooting Check TX–driver input Y Change N951 P:> –20dBm N Check COBBA TXCDAC (BaseBand) Check N980 upconverter Y Check Z950 insertion loss. Max 4 dB. output P:> –20 dBm N Check TX–IF f: 196.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Power control loop Power control section is basically similar for both bands, except for that both bands have their own directional coupler and detector. The power control is actually made in EROTUS IC. Is V929, V930 voltage drop about 0.3–0.4 V N Check V930, V929 Check bias circuit around diodes. Note ! See DETO vs. Output power curve Note: 1. DETO and TXC will be about same in each mode.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Synthesizers There are four oscillators generating the needed frequencies for RF–section. 19.44 MHz reference oscillator, 1GHz UHF VCO, 2Ghz UHF VCO and VHF VCO. Only VHF VCO is discrete solution and it has two fixed frequencies, 322.38 MHz for lowband and 392.46 MHz for upper band. VHF VCOs operating frequency is controlled by BAND–signal and PLL– circuit of EROTUS. All locals are locked to the stable reference oscillator.
Ty eYourNameHere Ty eDateHere NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation 19.44 MHz oscillator VCTCXO OUTPUT : 19.44 MHz G850 P:>0.8Vpp Note! N Check all soldering and supply voltages for VCTCXO and RFC–buffer. Check also coil L850. Change G850 Y Check AFC–signal from G850, pin1 V≅ 1.05 V N Check resistor R851 Y Check RFC–buffer N Check EROTUS supply voltages. N Start BB troubleshooting. output, C719 P: >0.3 Vpp Y Check 2G PLL N880, pin 15 P: >0.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation 19.44 MHz Oscillator (continued) Check VAPC Y Check PA input Y power V:>2.5 V Change PA P:> 0 dBm N N N Check TXC Typ 1.5V@PL2 Check Z975 filter Y Change Z975 Insertion loss IL>4dB N Y Start powercontrol troubleshooting Check TX–driver input Y Change N951 P:> –20dBm N Check COBBA TXCDAC (BaseBand) Check N980 upconverter Y Check Z950 insertion loss. Max 4 dB. output P:> –20 dBm N Check TX–IF f: 196.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation VHF VCO The VHF VCO signal is used to generate transmitter Intermediate frequencies. The VHF VCO has two fixed frequencies. Operating frequency is locked in Phase locked Loop, which is controlled by baseband. Because the oscillator has two frequencies, it has also two different switching modes. These modes are controlled by a BAND–signal. In AMPS and TDMA800 modes the VHF frequency is 322.38 MHz and logical level of BAND–signal is “HIGH”.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation AMPS& TDMA800 UHF SYNTHESIZER 1 GHz UHF VCO (G880) generates the first injection for RX (869...897) and the final injection for TX (824...849 MHz). The output frequency of the module depends on the DC–control voltage supplied by EROTUS in line PD2. Note! Is the frequency locked? Frequency = 985.23...1010.2 Vcnt = 1.3...3.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation TDMA1900 UHF SYNTHESIZER 2GHz UHF synthesizer generates desired injection frequencies for TX and RX chain. The output frequency of the VCO depends on the control voltage of the PLL–circuit. Note! Frequency = 985.23...1010.2 Vcnt = 1.3...3.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation RF ASIC DATA General Info EROTUS (N700) provides three main RF functions: 1. RX/TX IF blocks 2. PLLs for VHF and 1 GHz UHF 3. TX Power control circuits The receiver block consists of IF buffers, active mixers, 6–multiplier (3*+2*), AGC amplifier and limiter.
PAMS Technical Documentation NSW-4 Disassembly & Troubleshooting Power Amplifiers N903 & N960 RF9130 (N903) Pin no. Pin name 1 2 VCC L TUNE 3 4 GND VCC1 5 6 7 8 9 10 11 12 GND1 RF IN N/C Vreg GND GND GND RF OUT 13 14 15 16 Package Base RF OUT 2 * f0 GND Vbias Ground Description Power supply pin for bias circuit. Add RF bypass capacitor. Tuning pin for interstage matching network. A short (TBD) transmission line length is required for tuning interstage match.
NSW-4 Disassembly & Troubleshooting Pin no. PAMS Technical Documentation Pin name 13 14 15 16 Package Base Description RF output and bias for the output stage. 3rd stage collector. RF output and bias for the output stage. 3rd stage collector. No connection. (GND) No connection. (GND) Ground connection. The backside of the package should be connected to the ground plane through a short path. RF OUT RF OUT N/C N/C Ground PENTA regulator N702 Pin no.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Pin no. Pin name Nominal level Description 14 15 16 IF IN N/C TX ENA – Intermediate frequency input Not connected TX enable >2V TDMA1900 PLL–circuit N870 Pin no. Pin name Nominal level Description 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 FAST CPF CP VDD2 Vss3 RFI Vss2 POL PON Vss1 CLK DATA E Vdd1 XTALB XTALA GND(CP) Vcc Iset LOCK 2.8V – – 2.8V 0 – 0 2.8V 2.8V 0 2.8V 2.8V 2.8V 2.8V – – 0 4.
NSW-4 Disassembly & Troubleshooting PAMS Technical Documentation Warranty transfer Items: Service accessories: Product codes: 1 Warranty Cable SCH-6A 0730167 2 Flash Adapter FLA-12 0080389 The Warranty cable SCH–6A and 2 pcs Flash adapters FLA–12 are used to connect two phones and transfer the warranty data (user settings and serial numbers) from one phone to another. The warranty transfer procedure is described below: Point of Sale – Phone 1 is broken and Phone 2 is the swap phone.
