PAMS Technical Documentation NHM-8NX Series Transceivers Troubleshooting Instructions Issue 1 05/02 ãNokia Corporation
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Table of Contents Page No Transceiver Troubleshooting ......................................................................................... 4 Troubleshooting steps ..................................................................................................4 General instructions................................................................................................... 4 Baseband Troubleshooting............................
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions Call testing .................................................................................................................60 List of Figures Page No Fig 1 Receiver signal path ...................................................................................................19 Fig 2 Transmitter signal path ...............................................................................................20 Fig 3 Synthesiser...............
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Transceiver Troubleshooting Troubleshooting steps The following hints should help to find the cause of the problem when the circuitry seems to be faulty. This trouble shooting instruction is divided into sections. 1 Phone is totally dead 2 Power does not stay on or the phone is jammed 3 Flash programming does not work 4 Display is not working 5 Plug in SIM card is out of order (insert SIM card).
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Baseband Troubleshooting Baseband Testpoints Baseband testpoint PWB Placement R306 DLIGHT J416 EXTWRX J419 FLSCLK J420 FLSCSX J417 EXTRDX J418 FLS2CSX J414 DBUSDA J402 PURX J413 DBUSEN1X J404 SLEEPCLK J408 CBUSENX J406 CBUSCLK J407 CBUSDA J412 FBUSRX C230 VREFRF02 C231 VREFRF01 C222 VR4 J403 SLEEPX C225 VR6 C226 VR5 C223 VR2 C227 VR3 C224 VR7 C208 VCORE J425 RFCLK 4 GND 6 SIM I/O J410 MBUSRX 3 VSIM 2 RST 1 CLK J413 DBUSCLK C206 V
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation carded.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Phone is dead This means that the phone do not draw any current at all when supply is connected and/ or powerkey is pressed. It is assumed that the voltage supplied is 3.6 VDC. The UEM will prevent any functionality what so ever at battery/supply levels below 2.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Flash programming does not work The flash programming can only be done via the pads on the PWB (J100). In case of Flash failure in FLALI station, problem is most likely related to SMD problems. Possible failures could be short-circuit of balls under µBGAs (UEM, UPP, FLASH). Missing or misaligned components. In flash programming error cases the flash prommer can give some information about a fault.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Power does not stay on or phone is jammed If this kind of failure is presenting itself immediately after FLALI, it is most likely caused by ASICs missing contact with PWB. If for some reason the MCU does not service the watchdog register within the UEM, the operations watchdog will run out after approximately 32 seconds. Unfortunately, the service routine can not be measured.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Display information: "Contact Service" This error can only happen at power up where several self-tests is run. If any of these test cases fails the display will show the message: "Contact Service". It's individual test cases so the below lineup of error hunting's has no chronological order. Use common sense and experience to decide which test case to start error hunting at.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Phone does not register onto the network, or the phone cannot make a call If the phone doesn't register to the network, the fault can be in either BB or RF. Only few signals can be tested since several signals is 'burried' in one or more of the inner layers of the PWB. First of all check that SIM LOCK is not causing the error by using a Test-SIM card and connect the phone to a tester.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation SIM related faults Insert SIM card fault The hardware of the SIM interface from UEM (D200) to the SIM connector (X387) can be tested without a SIM card. When the power is switched on the phone first check for a 1,8V SIM card and then a 3V SIM card. The phone will try this four times, whereafter it will display ”Insert SIM card”.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation SIM-Card rejected The error ”SIM card rejected” means that the ATR message received from SIM card is corrupted, e.g. data signal levels are wrong. The first data is always ATR and it is sent from card to phone. Display shows : "SIM Card Rejected" Yes X387 VSIM = min. 1,6V(1,8V Card) VSIM = min. 2,8V(3V Card) (See illustration below) No Check : R386, PWB. Else defective D200* Yes X387 ATR data can be seen at SIM data pin.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Audio related faults Earpiece do not work Replace : Earpiece Error still present Z150, R161 Check Z150, R161 is working correctly (no short/open-circuit) No Check : R386, PWB.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Headset earpiece do not work and the isn't any mechanical problem R183, Z102 Check R183, Z102 is working correctly (no open-circuit) No Replace : C183 and/or Z102 Defective D200* Headset microphone do not work and the isn't any mechanical problem R166 Check voltage level on R166 towards UEM (bias) = 2,1V No Replace : C183 and/or Z102 Yes R151 Check voltage level on R151 towards UEM (bias) = 1,0V - 1,4V No Check : R166, R151, C17
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Charging failure Phone is OFF - battery is completely empty (<=3,1VDC) and no current from charger when connected L100 VCHAR > 2,1VDC Check : No F100, L100, V101, C100, R200, System-connector. No F100, L100, V101, C100, R200, System-connector.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Display info when charger is connected : "Not charging" R206 Voltage on R206 towards D200 is ~0,8VDC when power is connected. (BSI must be 75K) No Check : X101, R202, R206, C240. Yes R207 Voltage (use scope) on R207 towards D200 is ~0,9VDC at peak. (BTEMP must be 47K) No Check : X101, R202, R207, C220. Yes R200 Voltage on R200 towards D200 same as VBAT voltage No Check : R200, PWB.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation RF Troubleshooting Two types of measurements are used in the following. It will be specified if the measurement type is "RF" or "LF". • RF measurements should be done with a Spectrum Analyser and a high-frequency 500 ohm passive probe, for example HP54006A. (Note that when measuring with the 500 ohm probe the signal will be around 20 dB attenuated.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation RX/TX Z700 RX Supply filter VRX LNA Bias SAW Z602 INPL RX900 RX INML RXIM BBAMP Ant Switch GSM TX SAW Z601 LPF1 DCN1 AGC LPF2 INMM RXQP Pregain LNA RXQM PCN BBAMP TX DCN2 BIQUAD INPM RX1800 RX RXIP BIQUAD Pregain LNA VR6 VDDRXBB VDDRXF Figure 1: Receiver signal path LPF1 DCN1 AGC LPF2 DCN2 INPH RX1900 INMH 2 LNA 2 2 2 2 VDDDIG RF Controls 2 1/2 1/4 Mjoelner N600 VANTL / VANTM From the RX/TX
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Figure 2: Transmitter signal path Mjoelner N600 VDDDIG VANTL / VANTM VANTH 2 RF Controls VB_DET VTXLOL VTXLOH 1/2 VDDRXBB 1/4 RF Controls VTXBH VTXBL PCN V701 RX L704 2 Balun Buffer Ant Switch TX PCN VTX SAW Z603 PA N700 Dir.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation detector controls the charge pump to either charge or discharge the capacitors in the loopfilter. By charging/discharging the loopfilter the control voltage to the VCO changes and the LO-frequency will change. Therefore the PLL will make the LO-frequency stay locked to the 26MHz VCXO frequency. The loopfilter consists of the following components: C639-C641 and R618-R619.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Figure 4: Key component location Table 2: N600 Mjoelner RF IC Z601 PCN RX SAW Z602 EGSM RX SAW Z603 EGSM TX SAW B600 26 MHz crystal G600 VCO ( 3.6 GHz UHF VCO ) N700 Power Amplifier (PA) Z700 RX/TX switch Power Supply Configuration All power supplies for the RF Unit are generated in the UEM IC (D200). All power outputs from this IC has a decoupling capacitor at which the supply voltage can be checked.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Figure 5: Power supply configuration PA UEM Battery MJOELNER Vtx VR2 VddTX Vdddig VR3 VXO VddXO Vddbbb VPLL VR5 VCP VR1A Vrx VR6 VddPLL VddLO VddPre VddRXF VddRXBB VddCP Vbext Sel_addr VddDL Vbb VIO Vref1 Vref01 VR7 VCO module Vvco The names in bold are signal names used on the RF schematic pages. Names in the boxes within the Mjoelner and the VCO refers to pin names on the respective ICs (N600, G600).
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Figure 6: Supply points at UEM (D200) VR2=Vtx (C643) VR5=Vpll (C226) VR7=Vvco (C224) VR3=Vvcxo (C227) VR6=Vrx (C225) Vref01=Vref2 (C231 Figure 7: Supply point at Mjoelner (N600) Vio = Vbb (C621) Receiver General Instructions for GSM900 RX Troubleshooting Connect the phone to a PC with the module repair jig. Start Phoenix and establish connection to the phone Select File.
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions Select: Band: GSM900 Active Unit: RX Operation Mode: Continuous Rx/Tx Channel: 37 AGC: 9 The setup should now look like this: Issue 1 05/02 ãNokia Corporation Page 25
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Fault Finding Chart for GSM900 Receiver Figure 8: EGSM Receiver fault finding chart 1 4 3 2 Apply -55 dBm 942.4 MHz, offset 67.71 kHz from generator to antenna connector 1 YES Oscilloscope at RX I/Q signal 588 mVpp DC offset 1.35 V freq. 67.
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions Figure 9: RX900 I/Q signal waveform General Instructions for GSM1800 RX Troubleshooting Connect the phone to a PC with the module repair jig. Start Phoenix and establish connection to the phone Select File.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation The setup should now look like this: Page 28 ãNokia Corporation Issue 1 05/02
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Fault Finding Chart for GSM1800 Receiver Figure 10: GSM1800 receiver fault finding chart 1 1 4 3 2 Apply -55 dBm 1842.8 MHz, offset 67.71 kHz from generator to antenna connector YES 2 Oscilloscope at RX I/Q signal 408 mVpp DC offset 1.33 V freq. 67.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Figure 11: RX1800 I/Q signal waveform Page 30 ãNokia Corporation Issue 1 05/02
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Measurement points in the receiver Figure 12: RX measurements point at the RX/TX Switch - Z700 Vc1 Z700 Vc2 Z700 RX900 output Z700 RX1800 output Z700 Figure 13: Measurements points at the RX-Filters – Z601/Z602 RX900 RX900 RX1800 RX900 Mjoelner input INML Mjoelner input INPL Mjoelner input INMM Mjoelner input INPM L602 L603 L611 L601 RX1800 RX900 SAW filter bal output SAW filter bal output Z601 Z602 RX1800 RX900 SAW
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Figure 14: RX I/Q Signals, Baseband shielding can UEM (D200) RXQM RXIP D200 D200 RXIM D200 RXQP D200 Transmitter Measurement points for the transmitter Figure 15: TX measuremnet points in the PA ( N700 ) shielding can Vcon2_DCS Vcon1_GSM Pout_DCS Pin_DCS ANT VPCTRL_P DCS-Tx VTX_B_P DET_Out GSM-Tx (C717) VPCTRL_G Pout_GSM Pin_GSM VTX_B_G (C717) ' Page 32 ãNokia Corporation Issue 1 05/02
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation ' Figure 16 : TX measurement point in Mjolner (N600) shielding can TXQI TXQM Bal_Input1 GSM Bal_Input1 Bal_Input2 GSM Bal_Input2 OUT_D_TX VTX OUT_G_TX TXIP TXIM General instructions for GSM TX troubleshooting Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RFcable should be connected to measurement equipment or to at least a 10-dB attenuator, otherwise the PA may be damaged.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Your screen should look like: Measure the output power of the phone; it should be around 32.5 dBm. Remember the loss in the jig; around 0.3 dB. Fault finding chart for GSM900 transmitter Fault finding in output power For the spectrum analyser measurements in the following chart use the 500 ohm passive probe. Since the signal measured is bursted it is advised to set the analyser to maxhold.
Issue 1 05/02 Check C739, L702 Check Z700 ( RX/TX Switch ) Yes Vcon2_DCS = 0V Vcon1_GSM = 2.7 V With Scope check on TX/RX Swith: Yes Yes Measure TX Power on GSM-TX. Power ~ 8 dBm No Measure Power on ANT with Power Meter or RCT > 30.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Figure 17: VPCTRL_G & TXC Yellow trace: Vpctrl_G @ power level 5, ch37 Pink trace: TXC GSM900 band Fault finding in modulation The following plots show different situations of TX IQ measurements. Depending on the time the modulation may cause the signal to look differently.
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions I/Q signals look almost the same regardless if modulation is by "1" or by "0". There is no significante difference between TXIP and TXIM. The same is valid for TXQP and TXQM. PCN TransmitterGeneral instructions for PCN TX troubleshooting Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RFcable should be connected to measurement equipment or to at least a 10-dB attenuator, otherwise the PA may be damaged.
Page 38 Check C739, L702 With Scope check : VPCTRL_P ( See figure 21 ) Yes -14 dBm Measure Pin_DCS ãNokia Corporation Check V700 ( detector ) + discretes around Yes With Scope check : TXC ( See figure 21 ) Check N700 ( PA ) No Check Z700 ( RX/TX Switch ) Check L709 ( Coupler ) Yes 11 dBm Measure Pout_DCS Yes No Yes Vcon2_DCS = 2.7 V Vcon1_GSM = 2.7 V With Scope check on TX/RX Swith: Yes Yes Measure TX Power on DCS-TX.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Figure 19: VPCTRL_P & TXC Yellow trace : Vpctrl_P @ power level 0, ch700 Pink trace : TXC PCN1800 band ** TXIQ signals look the same in PCN and GSM Synthesizer There is only one PLL synthesizer generating Local Oscillator frequencies for both RX and TX in both bands ( PCN and EGSM). The VCO frequency is divided by 2 for PCN operation or by 4 for EGSM operation inside the Mjoelner IC.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation 26MHz signal is divided by 2 to achieve 13MHz inside the UPP IC (D400). The 26 MHz signal from the VCXO can be measured by probing R425 (must be measured on the UPP side of R425 i.e. the end not connected to C425). The level at this point is approx. 700mVpp. Frequency of this oscillator is adjusted by changing the AFC-register inside the Mjoelner IC. This is done via the Mjoelner serial interface.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation VCO The VCO is generating frequencies in the range of 3420.2MHz – 3839.2 MHz when the PLL is running. The output frequency from the VCO is led to the Local oscillator input of the Mjoelner IC (N600), where the frequency is divided by 2 or 4 so that they can generate all channels in EGSM and PCN respectively. Frequency of the VCO is controlled by a DC-voltage ( Vctrl ) coming from the loopfilter.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation If the phone stops working a short time after the power is turned ON, a possible reason forthis might be that the 26MHz system clock signal is not getting to the UPP clockinput in BaseBand. In this case check the following: 1 Turn on the phone and check 2 VCXO Power supply (C620) = 2.7V 3 VCXO output (R425 – end not connected to C425) is 26MHz and approx.
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions Figure 23: Measurement point for VCXO output VCXO Output (R425) Measure at this end! Measurement points at the PLL/VCO Figure 24: Measurement point for PLL VCO Vcc (R656) VCO Output is also detected here! Issue 1 05/02 ãNokia Corporation Page 43
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation CP Vcp (C616) Vcp=VR1A PLL Vcc (C614, C634) Page 44 ãNokia Corporation Issue 1 05/02
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions Frequency lists GSM900 Frequency list NHM-5 GSM900 CH TX RX VCO TX VCO RX CH TX RX VCO TX VCO RX 975 880.2 925.2 3520.8 3700.8 1 890.2 935.2 3560.8 3740.8 976 880.4 925.4 3521.6 3701.6 2 890.4 935.4 3561.6 3741.6 977 880.6 925.6 3522.4 3702.4 3 890.6 935.6 3562.4 3742.4 978 880.8 925.8 3523.2 3703.2 4 890.8 935.8 3563.2 3743.2 979 881 926 3524 3704 5 891 936 3564 3744 980 881.2 926.2 3524.8 3704.8 6 891.2 936.2 3564.8 3744.8 981 881.4 926.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation PCN CH TX RX VC O TX VC O R X CH VC O R X CH TX RX VC O TX VC O R X CH TX RX VC O TX VC O R X 512 1710.2 1805.2 3420.4 3610.4 606 1729 1824 3458 3648 700 1747.8 1842.8 3495.6 3685.6 794 1766.6 1861.6 3533.2 3723.2 513 1710.4 1805.4 3420.8 3610.8 607 1729.2 TX 1824.2 RX VC O T X 3458.4 3648.4 701 1748 1843 3496 3686 795 1766.8 1861.8 3533.6 3723.6 514 1710.6 1805.6 3421.2 3611.
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions Alignment NHM-8NX manual align with Phoenix In Phoenix select connection Fbus and Product Gemini. If you power up the board before selecting Fbus, it works without any error messages. Use Jig or other device for RF and bus connection. Attenuation in the probe alone is 0.5dB for 900 and 1dB for 1800. Use CMD55 or other suitable device. Default channels are 37 for GSM900 and 700 for GSM1800.
NHM-8NX Troubleshooting Instructions Page 48 PAMS Technical Documentation 1 Select Automatic, set to 60dBm in small window in top bar 2 Start and select PM settings in the start parameters that pops up 3 OK ãNokia Corporation Issue 1 05/02
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions 1 The existing data in the phone is shown 2 Calibrate, and the new data is shown 3 Stop, and the little window pops up where you can select to save or not 4 Select GSM1800 in the top bar and repeat at channel 700 1 The existing data in the phone is shown 2 Calibrate, and the new data is shown 3 Stop, and the little window pops up where you can select to save or not RX channel select filter 1 Select Maintenance, Tuning, Rx Chann
NHM-8NX Troubleshooting Instructions 4 PAMS Technical Documentation Press Stop and you can select to save values to the phone or not Note: This calibration requires no input signal RX Band Filter Response 1 Select Maintenance, Tuning, Rx Band Filter Response Compensation 2 Press Start, Read from PM area and you can select to load values from the phone or not 3 Press Manual Tuning 4 Set the Signal generator according to the pop-up windows 5 When finished press Stop, Write to PM area and you can s
PAMS Technical Documentation 6 NHM-8NX Troubleshooting Instructions Repeat for GSM1800 Note: This calibration requires a lot of different frequencies from the generator. If you have a signal generator with a frequency list option you can with advantage use Auto Tuning (Dwell should be around 10ms).
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation TX power tuning GSM Page 52 1 Select edge off, GSM 900 2 Press Start and select from where to load values. Best is to have PC saved data from a good phone.
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions later. 1 Select the modulation 1, 0 or random in Tx Data Type. Select random if a GSM tester is used. Then it can synchronise to the burst.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation 5 Calculate coefficients 1 Select Tx PA Mode low and tune the high lighted values. 2 The base level coefficient is taken from the high mode. Do not change it. 3 Calculate and select Stop If you are satisfied with the coefficients and the power, then save to the Permanent memory. You can also save the table to the PC, so that you can load it to an other phone. Or you can select not to do anything by removing both ticks.
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions TX power tuning PCN 1 GSM 1800 band (PCN) 2 Start 3 Select where to get values from.
NHM-8NX Troubleshooting Instructions Page 56 PAMS Technical Documentation 4 OK 1 Select the wanted modulation. Random if a GSM tester is used, so that you can synchronise the burst. 2 Only high mode is possible 3 Tune the highlighted values to the wanted power 4 Tune base level to –27dBm 5 Stop 6 Select where to save the values, one, both or no one can be selected.
PAMS Technical Documentation 7 NHM-8NX Troubleshooting Instructions Yes. That’s the only way to end tuning. I/Q tuning Select Maintenance, Tuning, Tx IQ tuning Set CMD55 to Narrow Spectrum on the same band as the phone. Selected in the top menu. 1 Select where to get values. Normally select Load From Product 2 Start 3 Tune offset values to lowest carrier. Use Side arrows or +, - . 4 Tune Amplitude and phase to lowest sideband.
NHM-8NX Troubleshooting Instructions 5 PAMS Technical Documentation Check eventually with other modulation (0). Remember to tick Save to Product if you want to save to phone.
PAMS Technical Documentation NHM-8NX Troubleshooting Instructions 1 Same procedure for PCN as for GSM. 2 Remember to tick Save To Product. 3 Stop. Ends tuning and does what you have ticked. RF control This menu can be placed in maintenance or in tuning dependent of Phoenix. It is meant to check the receiver or transmitter without going in call. It works very much like a call, but you have control via the PC, and not via the tester. The TX mode GSM900 can select between Free, High and low mode.
NHM-8NX Troubleshooting Instructions PAMS Technical Documentation Call testing If all tunings are done, and the phone TX and RX is working a call is the ultimate test of the phone. Set CMD55, or similar tester, to manual test and switch the phone to normal if it was in local. Remember to have a test simcard in the phone. When the phone has made a registration a call can be made, and it is possible to let the phone answer via Phoenix.
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NHM-8NX Troubleshooting Instructions Page 62 PAMS Technical Documentation ãNokia Corporation Issue 1 05/02
