Nokia NHM-8NX Series Troubleshooting Instructions Download

Page: 23 / 62

PAMS Technical Documentation

Troubleshooting Instructions

NHM-8NX

Issue 1 05/02

Nokia Corporation

Page 23

Figure 5: Power supply configuration

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).

Table 3:

Please see the picture below for measuring points at the UEM (D200).

Supply name RF

Supply name UEM

Min

Typ

Max

Unit

VTX

VR2

2.64

2.78

2.86

VXO

VR3

2.64

2.78

2.86

VCP

VR1A

4.75

VPLL

VR5

2.64

2.78

2.86

VRX

VR6

2.64

2.78

2.86

VVCO

VR7

2.64

2.78

2.86

VBB

VIO

1.72

1.8

1.88

VREF2

VrefRF01

1.334

1.35

1.366

VBATT

BATTERY

3.1

3.6

5.2

VR2

VR3

VR5

VR6

VR7

VIO

Vref01

Battery

UEM

Vtx

VddTX

MJOELNER

VXO

VddXO

VPLL

VddLO
VddPre

VddPLL

Vrx

VddRXF

VddRXBB

Vvco

Vref1

Vbext

Vbb

VddDL

Sel_addr

VCO

module

Vdddig

Vddbbb

VR1A

VddCP

VCP

Summary of Contents for NHM-8NX Series

Page 1: ...PAMS Technical Documentation NHM 8NX Series Transceivers Issue 1 05 02 ãNokia Corporation Troubleshooting Instructions ...

Page 2: ...General Instructions for GSM900 RX Troubleshooting 24 Fault Finding Chart for GSM900 Receiver 26 General Instructions for GSM1800 RX Troubleshooting 27 Fault Finding Chart for GSM1800 Receiver 29 Measurement points in the receiver 31 Transmitter 32 Measurement points for the transmitter 32 General instructions for GSM TX troubleshooting 33 Fault finding chart for GSM900 transmitter 34 PCN Transmit...

Page 3: ...Fig 10 GSM1800 receiver fault finding chart 29 Fig 11 RX1800 I Q signal waveform 30 Fig 12 RX measurements point at the RX TX Switch Z700 31 Fig 13 Measurements points at the RX Filters Z601 Z602 31 Fig 14 RX I Q Signals Baseband shielding can UEM D200 32 Fig 15 TX measuremnet points in the PA N700 shielding can 32 Fig 16 EGSM900 transmitter fault finding chart 35 Fig 17 VPCTRL_G TXC 36 Fig 18 GSM...

Page 4: ... Flash are moisture sensitive and must be pre baked prior to soldering if they have been out of their vacuum package longer than the specified time Connect test jig MJS 37 to computer with DAU 9S cable or to FPS 8 Flash Prommer with AXS 4 serial cable Make sure that you have PKD 1 dongle connected to computer s parallel port Connect DC power supply to module test jig MJS 37 with FLC 2 cable Set th...

Page 5: ...416 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 R161 1 EARP PRODTP3 FBUS RX PRODTP2 FBUS TX PRODTP7 MBUS PRODTP6 VPP C205 VFLASH1 R183 2 HF C157 HEADINT 6 SIM I O R310 KLIGHT C100 VCHARIN C206 VANA J410 MBUSRX 3 VSIM 2 RST 1 CLK J150 HOOKINT C227 VR3 C224 VR7 C208 VCORE C222 VR4 C223 VR2...

Page 6: ...NHM 8NX Troubleshooting Instructions PAMS Technical Documentation Page 6 ãNokia Corporation Issue 1 05 02 carded ...

Page 7: ...No Yes Check R317 C310 S300 Pin 1 3 is HIGH when power key is untouched Check Z261 C261 Z264 C264 Check X101 Yes No No J402 PURX 1 8VDC 1 sec after power key is pressed Z261 C261 Z264 C264 Voltage 3 6VDC S300 Pin 1 3 is 0VDC LOW when power key is pressed J425 26 MHz clock min 300mVACpp probe Cin 10 13 pF 10M C227 VR3 2 78VDC J404 Sleep clock is 32 768 kHz 1 8Vpp Check C227 PWB Else defective D200 ...

Page 8: ...information about a fault The fault information messages could be Phone doesn t set FBUS_TX line low Because of the use of uBGA components it is not possible to verify if there is a short cir cuit in control and address lines of MCU UPP and memory flash Flash prgramming do not work Error from prommer Phone doesn t set FBUS_TX line low Yes Check PWB Else defective D200 J409 J410 J411 J412 Voltage l...

Page 9: ... the operations watchdog will run out after approximately 32 seconds Unfortunately the service routine can not be measured Power doesn t stay on or phone is jammed J404 Sleep clock 32 768 kHz 1 8Vpp Yes Check D450 Keymat Lightguide PWB Else defective D400 UI functionality and keys react to pressure Check PWB Else defictive D200 Yes No No J402 PURX 1 8VDC 1 sec after power key is pressed Check C425...

Page 10: ...mmon sense and experience to decide which test case to start error hunting at Display shows Contact Service EarDa MicDa between UPP and UEM Check PWB Else defective D200 or D400 MBUS interface between UPP and UEM AuxDa UEMInt between UPP and UEM Yes No SleepX SleepClk between UPP UEM Key is stucked TXI QD RXI QD SIM interface between UPP UEM Flash checksum ASIC version vs compilation flag PMM chec...

Page 11: ...C All during GSM frame call mode Use TXP on C646 as trigger Check C222 C223 C224 C225 C226 C227 PWB Else defective D200 or D400 J608 J609 J610 Check RF serial bus during GSM frame Logic HIGH 1 8VDC Logic LOW 0VDC RFBUSCLK J608 RFBUSDA J609 RFBUSEN1X J610 C222 C233 C224 C225 C226 C227 Voltage 2 78VDC All during GSM frame call mode Use TXP on C646 as trigger No Yes Check PWB Else defective D200 or D...

Page 12: ... 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 Display shows Insert SIM Card Check X387 R386 PWB Else defective D200 X387 Verify that phone checks for 1 8V SIM and then 3V SIM during power up See illustration below Yes No Yes SIM Interface OK Check for SIM voltage dur...

Page 13: ...are wrong The first data is always ATR and it is sent from card to phone For reference a picture with normal SIM power up is shown below Display shows SIM Card Rejected Check R386 PWB Else defective D200 X387 VSIM min 1 6V 1 8V Card VSIM min 2 8V 3V Card See illustration below Yes No Yes SIM Interface OK X387 ATR data can be seen at SIM data pin Check X387 R386 PWB No Yes Normal SIM power up seque...

Page 14: ...n circuit Replace Earpiece Yes Error still present Microphone do not work and the isn t any mechanical problem Check R165 C168 PWB Else defctive D200 No Error still present R165 Check voltage level on R165 towards UEM bias 2 1V Replace C103 and or Z100 Yes Replace System Connoctor C103 Z100 Check C103 Z100 is working correctly no short open circuit No R153 Check voltage level on R153 towards mic l...

Page 15: ...3 Z102 is working correctly no open circuit No Headset microphone do not work and the isn t any mechanical problem Replace C183 and or Z102 Defective D200 R166 Check voltage level on R166 towards UEM bias 2 1V No R152 R165 R168 C155 C156 C172 C170 C173 C174 Z101 Check XMIC line to UEM D200 Check R166 R151 C171 R151 Check voltage level on R151 towards UEM bias 1 0V 1 4V No Yes Yes Error still prese...

Page 16: ...is completely empty 3 1VDC and no current from charger when connected Check F100 L100 V101 C100 R200 System connector L100 VCHAR 2 1VDC No Defective D200 Yes Phone is ON or OFF battery nominal voltage 3 6VDC and no current from charger when connected Check F100 L100 V101 C100 R200 System connector L100 VCHAR 3 6VDC No Defective D200 or D400 Yes ...

Page 17: ...206 towards D200 is 0 8VDC when power is connected BSI must be 75K No Check PWB Yes R207 Voltage use scope on R207 towards D200 is 0 9VDC at peak BTEMP must be 47K Check X101 R202 R207 C220 No R200 Voltage on R200 towards D200 same as VBAT voltage Check R200 PWB Else defective D200 R200 Voltage rises slowly on R200 towards D200 when charger is connected Check PWB Else defective D200 No No Yes Yes ...

Page 18: ... static discharge sensitive So ESD protection must be taken during repair ground straps and ESD soldering irons Mjoelner and Bifrost is mois ture sensitive so parts must be pre baked prior to soldering Apart from key components described in this document there are a lot of discrete com ponents resistors inductors and capacitors for which troubleshooting is done by check ing if soldering of the com...

Page 19: ... path The I Q signal from the BB is routed two the modulators for both 900 and 1800 MHz The output of the modulators is either terminated in a SAW filter Z603 for GSM 900 or a balun for GSM1800 Both signals are amplified in buffers whereby a limiting effect takes place to suppress some of the AM contents of the signal The amplitude limited signal is then amplified in the PA N700 where the gain con...

Page 20: ... and frequency of the LO sig nal Building blocks for the PLL are Phase detector Charge Pump Voltage Controlled Oscillator VCO N Divider and loopfilter As mentioned earlier only the VCO and loopfil ter is external to the Mjoelner IC The VCO G600 is the component that actually generates the LO frequency Based on the control voltage input the VCO generates a single ended RF output The signal is then ...

Page 21: ...Figure 3 Synthesiser RF Key component placement Table 1 Frequency plan Frequency band Channel System Frequency Band MHz PLL Frequency band MHz EGSM RX 975 1023 1 12 925 2 959 8 3700 8 3839 2 TX 880 2 914 8 3520 8 3659 2 PCN RX 512 885 1805 2 1879 8 3610 4 3759 6 TX 1710 2 1784 8 3420 4 3569 6 64 65 NDIV ADIV ϕ Charge Pump RDIV 1 2 1 4 CPOUT 1 2 1 4 PLL loop filter 26MHz RBEXT VXO RF_EN RF_CLK RF_D...

Page 22: ...or 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 The power supply configuration used in the HDb12 phone is shown in the blockdiagram below 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 ...

Page 23: ...ee the picture below for measuring points at the UEM D200 Supply name RF Supply name UEM Min Typ Max Unit VTX VR2 2 64 2 78 2 86 V VXO VR3 2 64 2 78 2 86 V VCP VR1A 4 75 V VPLL VR5 2 64 2 78 2 86 V VRX VR6 2 64 2 78 2 86 V VVCO VR7 2 64 2 78 2 86 V VBB VIO 1 72 1 8 1 88 V VREF2 VrefRF01 1 334 1 35 1 366 V VBATT BATTERY 3 1 3 6 5 2 V VR2 VR3 VR5 VR6 VR7 VIO Vref01 Battery UEM PA Vtx VddTX MJOELNER ...

Page 24: ...Mjoelner N600 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 Select Scan for Product Ctrl R Select Maintenance Testing and then RF Controls VR2 Vtx C643 VR7 Vvco C224 VR5 Vpll C226 VR3 Vvcxo C227 VR6 Vrx C225 Vref01 Vref2 C231 Vio Vbb C621 ...

Page 25: ...al Documentation Troubleshooting Instructions NHM 8NX Issue 1 05 02 ãNokia Corporation Page 25 Select The setup should now look like this Band GSM900 Active Unit RX Operation Mode Continuous Rx Tx Channel 37 AGC 9 ...

Page 26: ...offset 67 71 kHz from generator to antenna connector Oscilloscope at RX I Q signal 588 mVpp DC offset 1 35 V freq 67 71 kHz EGSM chain functional Check RX TX switch at RX 900 Z700 56 dBm Oscilloscop check Vc1 and Vc2 at Z700 signal 0V Spectrum analyzer EGSM SAW filter Z602 output 65 dBm Spectrum analyzer Check signal after inductors L603 and L602 65 dBm Check SAW filter Z602 Oscilloscope VRX 2 7 V...

Page 27: ...aveform 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 Select Scan for Product Ctrl R Select Maintenance Testing and RF Controls Select Band GSM1800 Active Unit RX Operation Mode Continuous Rx Tx Channel 700 AGC 9 ...

Page 28: ...NHM 8NX Troubleshooting Instructions PAMS Technical Documentation Page 28 ãNokia Corporation Issue 1 05 02 The setup should now look like this ...

Page 29: ...Hz offset 67 71 kHz from generator to antenna connector Oscilloscope at RX I Q signal 408 mVpp DC offset 1 33 V freq 67 71 kHz PCN chain functional Check RX TX switch at RX 1800 Z700 57 dBm Oscilloscop check Vc1 and Vc2 at Z700 signal 0V Spectrum analyzer PCN SAW filter Z601 output 65 dBm Spectrum analyzer Check signal after inductors L611 and L601 65 dBm Check SAW filter Z601 Oscilloscope VRX 2 7...

Page 30: ...NHM 8NX Troubleshooting Instructions PAMS Technical Documentation Page 30 ãNokia Corporation Issue 1 05 02 Figure 11 RX1800 I Q signal waveform ...

Page 31: ...X Switch Z700 Figure 13 Measurements points at the RX Filters Z601 Z602 RX900 output Z700 Vc2 Z700 Vc1 Z700 RX1800 output Z700 RX1800 SAW filter unbal input Z601 RX900 SAW filter unbal input Z602 RX1800 SAW filter bal output Z601 RX900 SAW filter bal output Z602 RX900 Mjoelner input INML L602 RX900 Mjoelner input INPM L601 RX900 Mjoelner input INPL L603 RX1800 Mjoelner input INMM L611 ...

Page 32: ... I Q Signals Baseband shielding can UEM D200 Transmitter Measurement points for the transmitter Figure 15 TX measuremnet points in the PA N700 shielding can RXQM D200 RXIM D200 RXIP D200 RXQP D200 Vcon1_GSM Vcon2_DCS ANT Pout_DCS Pout_GSM C717 Pin_GSM Pin_DCS VPCTRL_G VTX_B_P VTX_B_G DCS Tx GSM Tx C717 DET_Out VPCTRL_P ...

Page 33: ... transmitted signal act as normal RF cable should be connected to measurement equipment or to at least a 10 dB attenuator otherwise the PA may be damaged Start Phoenix Service Software and establish a connection to the phone e g FBUS Select File and Product Gemini Select Maintenance Testing and RF Controls Band GSM 900 Active Unit TX Tx Power Level 5 Tx Data Type Random OUT_D_TX OUT_G_TX VTX TXIP ...

Page 34: ...he 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 ...

Page 35: ...t to Z603 20 dBm With Scope check VTX 2 7 V discretes around No No No No No No Yes With Scope check on TX RX Swith Vcon2_DCS 0V Vcon1_GSM 2 7 V Yes Check C739 L702 Check Z700 RX TX Switch Yes Check L709 Coupler Yes With Scope check VPCTRL_G See figure 18 Yes Check N700 PA Yes With Scope check VTX_B_G 2 7 V Yes Check V702 discretes around Yes Check Z603 TX SAW filter Yes Check TXIP and TXQP See fig...

Page 36: ...s show different situations of TX IQ measurements Depending on the time the modulation may cause the signal to look differently TX I Q waveforms Yellow trace Vpctrl_G power level 5 ch37 Pink trace TXC GSM900 band Pink trace TXQP Blue trace TXIP All 1 Pink trace TXQP Blu etrace TXIP Random Pink trace TXQP Blue trace TXIP All 1 Zoom In Pink trace TXQP Blu etrace TXIP Random Zoo ...

Page 37: ...ansmitted signal act as normal RF cable should be connected to measurement equipment or to at least a 10 dB attenuator otherwise the PA may be damaged Start Phoenix Service Software and establish a connection to the phone e g FBUS Select File Choose Product Gemini Select Maintenance Testing and then RF Controls Band GSM 1800 Active Unit TX Tx Power Level 0 Tx Data Type Random Your screen should lo...

Page 38: ...t to T600 16 dBm With Scope check VTX 2 7 V discretes around No No No No No No Yes With Scope check on TX RX Swith Vcon2_DCS 2 7 V Vcon1_GSM 2 7 V Yes Check C739 L702 Check Z700 RX TX Switch Yes Check L709 Coupler Yes With Scope check VPCTRL_P See figure 21 Yes Check N700 PA Yes With Scope check VTX_B_P 2 7 V Yes Check V701 discretes around Yes Check T600 PCN Balun Yes Check TXIP and TXQP See figu...

Page 39: ...ve Unit RX Operation Mode Continuous RX TX Channel 700 It is not possible to measure the output of the VCO G600 directly as this component is placed underneath a shielding can without detachable lid However with spectrum ana lyzer and 500 ohm passive probe it is possible to get an indication if the VCO outputs the correct frequency To do this probe R656 the frequency should be 3685 6MHz and the po...

Page 40: ...z 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 Example Signal Measured at VCXO output R425 Figure 20 VCXO 26 MHz waveform ...

Page 41: ...finding chart for PLL Synthesizer Figure 21 PLL fault finding chart From Phoenix chose File Choose Product NHM 8NX Mainenance Testing RF Controls GSM1800 RX Continuous Ch 700 Spectrum Analyzer Measure VCO frequency at R656 3685 6MHz Oscilloscope Measure VCXO Power Supply at C620 2 7 V Check UEM Software Phone not in function PLL block functional Oscilloscope Measure VCXO output On R425 26 MHz Appr...

Page 42: ...nal is not getting to the UPP clock input 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 700mVpp If this is not the case check the reference crystal B600 and Mjolner N600 as well as R425 R426 C425 C426 Measurement points for the PLL Measurement points at the VCXO Figure 22 Mea...

Page 43: ...ctions NHM 8NX Issue 1 05 02 ãNokia Corporation Page 43 Figure 23 Measurement point for VCXO output Measurement points at the PLL VCO Figure 24 Measurement point for PLL VCXO Output R425 Measure at this end VCO Vcc R656 VCO Output is also detected here ...

Page 44: ...NHM 8NX Troubleshooting Instructions PAMS Technical Documentation Page 44 ãNokia Corporation Issue 1 05 02 PLLVcc C614 C634 CPVcp C616 Vcp VR1A ...

Page 45: ...11 2 1002 885 6 930 6 3542 4 3722 4 28 895 6 940 6 3582 4 3762 4 90 908 953 3632 3812 1003 885 8 930 8 3543 2 3723 2 29 895 8 940 8 3583 2 3763 2 91 908 2 953 2 3632 8 3812 8 1004 886 931 3544 3724 30 896 941 3584 3764 92 908 4 953 4 3633 6 3813 6 1005 886 2 931 2 3544 8 3724 8 31 896 2 941 2 3584 8 3764 8 93 908 6 953 6 3634 4 3814 4 1006 886 4 931 4 3545 6 3725 6 32 896 4 941 4 3585 6 3765 6 94 ...

Page 46: ... 1814 2 3438 4 3628 4 651 1738 1833 3476 3666 745 1756 8 1851 8 3513 6 3703 6 839 1775 6 1870 6 3551 2 3741 2 558 1719 4 1814 4 3438 8 3628 8 652 1738 2 1833 2 3476 4 3666 4 746 1757 1852 3514 3704 840 1775 8 1870 8 3551 6 3741 6 559 1719 6 1814 6 3439 2 3629 2 653 1738 4 1833 4 3476 8 3666 8 747 1757 2 1852 2 3514 4 3704 4 841 1776 1871 3552 3742 560 1719 8 1814 8 3439 6 3629 6 654 1738 6 1833 6 ...

Page 47: ...lt channels are 37 for GSM900 and 700 for GSM1800 The alignments and calibrations must be performed in the order shown to give reliable results The way to save data to the phone and to load data from the phone is made different in the various tunings Always look what is shown in the windows regarding these issues and act accordingly To vary a selected parameter you can use and key or in some cases...

Page 48: ...oting Instructions PAMS Technical Documentation Page 48 ãNokia Corporation Issue 1 05 02 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 ...

Page 49: ... 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 Channel Select Filter Calibration 2 Press Start and you can select to load values from the phone...

Page 50: ...ibration 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 select to save values to the phone or not ...

Page 51: ...Page 51 6 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 advan tage use Auto Tuning Dwell should be around 10ms Tx Power tuning Select Maintenance Tuning Tx Power Level Tuning ...

Page 52: ...Documentation Page 52 ãNokia Corporation Issue 1 05 02 TX power tuning GSM 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 The data from a good phone can be saved to PC for use ...

Page 53: ...er 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 2 Select Tx PA Mode High 3 Tune the highlighted values to the wanted power Use average burst power 4 Tune base level to 28dBm Close to lowest level CMD55 can keep synchronisa tion ...

Page 54: ...alues 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 Only way to end the tuning session is with Yes ...

Page 55: ...echnical Documentation Troubleshooting Instructions NHM 8NX Issue 1 05 02 ãNokia Corporation Page 55 TX power tuning PCN 1 GSM 1800 band PCN 2 Start 3 Select where to get values from Normally Permanent Memory ...

Page 56: ...ue 1 05 02 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 ...

Page 57: ...y 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 ...

Page 58: ...ions PAMS Technical Documentation Page 58 ãNokia Corporation Issue 1 05 02 5 Check eventually with other modulation 0 Remember to tick Save to Product if you want to save to phone 1 Stop to end the tuning with the selected save option ...

Page 59: ...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 It changes the PA mode but changes also the power level if a level is selected that is not supported in that mode If you want to tune at other channels th...

Page 60: ... 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 In the Autocaller Maintenance Testing you can answer by ticking Answer when button pushed and then posh the button ...

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Page 62: ...NHM 8NX Troubleshooting Instructions PAMS Technical Documentation Page 62 ãNokia Corporation Issue 1 05 02 ...

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