Nokia NME-2A Series, Troubleshooting Instructions

Page 1: ...Programmes After Market Services P A M S NME 2A SeriesTransceivers Technical Documentation Original 08 97 Troubleshooting Instructions ...

Page 2: ...P A M S Technical Documentation NME 2A Troubleshooting Instructions Page 2 Original 08 97 AMENDMENT RECORD SHEET Amendment Number Date Inserted By Comments 08 97 Original ...

Page 3: ...ubleshooting Flow Diagrams 5 Flash Programming OK part 1 6 Flash Programming OK part 2 7 Flash Programming OK part 3 8 Flash Programming OK part 4 9 PWR Button Fault 10 Display Selftest Failed 11 No Registration to the System no serv 12 Audio Fault 13 RF Troubleshooting Instructions 14 RX Part 14 TX Part 17 UHF Synthesizer 19 VHF Synthesizer 19 ...

Page 4: ...P A M S Technical Documentation NME 2A Troubleshooting Instructions Page 4 Original 08 97 This page intentionally left blank ...

Page 5: ...ipment PC for PCLocals Power supply 12 V 5 A Digital multimeter Oscilloscope with 10 1 probes Spectrum analyzer capable of 10 W input e g external attenuator Signal generator Test SIM RF cables with BNC or N in the other end Modular cable RS232 M2BUS adapter DAU 2 HP8922H BB Troubleshooting Flow Diagrams The baseband flow diagrams give you the overview of the blocks The purpose is that you proceed...

Page 6: ...ines data line disconnected VREF unconnected MBUS line X100 5 5 V after pwr on R263 5 V VBATT pins 4 16 Check X102 N100 pin 8 XRESET 5 V after pwr on C114 OK R106 OK Change N100 MCU D250 PIN67 RDX 5 V after pwr on NO If D250 at pin 66 TXD doesn t apply 5 V change D250 V250 base 1 V Check R262 R263 V250 V251 Check R257 R260 R258 V250 R268 Change first D250 If R259 is OK change D250 NO NO NO Power s...

Page 7: ...902 C918 26 MHz at MCU D250 pin 69 MCUCLK MCU D250 pin 8 MD2 pin 9 STNDBY MCU D250 pin 43 XPWROFF pulses up to 5 V after pwr on NO YES YES MCU D250 pin 77 IRQ0 5 V after power on MCU D250 pin 4 WSTROBEX 5 V after pwr on Change D300 Check joints and foils Change D250 Change D300 Check D300 Check all soldered joints The data and address signals must a clear difference between low 0 V and high 5 V YE...

Page 8: ...n OK FLASH8N MES D253 EEPROM YES 3 MBUS registration OK Display selftest failed D253 EEPROM pin 27 EROMSELX pulses 5 to 0 V during r w action Check D300 NO NO 4 pin 1 RSTROBEX pulses 5 to 0 V during r w action D253 EEPROM pin 1 WSTROBEX pulses 5 to 0 V during r w action YES Check D250 NO D300 Check D250 D300 Change D253 NO YES YES YES YES ...

Page 9: ...X100 pin 7 TXD2 pulses during programming Check D250 pin 63 R250 R251 C250 D251 FLASH pin 12 PWD 5 V after power on NO Check D300 D251 FLASH pin 9 ROMSELX pulses from 5 to 0 V after power on NO Check D250 D300 YES YES D251 FLASH pin 37 RSTROBEX pulses from 5 to 0 V after power on NO Check D250 D300 D251 FLASH pin 38 WSTROBEX pulses from 5 to 0 V after power on NO Check D250 D300 Check D251 FLASH A...

Page 10: ...ow or Check N101 pin 2 6 2 V if not OK N100 PSL pin 9 XPWROFF pulses from 0 to 5 V after power on Check VL1 VL2 VA2 VREF if OK then change N100 N101 pin 4 VBATT voltage V110 gate is 0V Check V101 if OK change V110 D250 pin 5 42 VL1 5 V When XPWRON Check V106 L100 Change N100 is push high Check D250 D300 NO NO YES YES NO NO YES Check V102 V103 V104 R109 R110 R111 R113 R133 R134 C100 change N101 C11...

Page 11: ... ROM bus test Unprogrammed FLASH Unconnected pins in MCU address or data lines MCU DSP code download failed DSP tests no responce RFI bus fault NO YES Codec N150 pin 12 PCMDO Codec N150 pin 13 PCMDI Codec N150 pin 19 PCMCLK Codec N150 pin 20 XSELPCMC DSP clock oscillator DSP pin 45 INT1 DSP pin 10 ERAMHI DSP pin 9 IOX DSP pin 12 EROM DSP pin 14 RWN DSP pin 15 EXM DSP pin 39 RSTB RFI RFIAD 3 0 RFI ...

Page 12: ...I pins 1 63 RXI RXQ RFI pin 3 EXTBG 4 096 V RFI pin 4 VCM 2 35 V RFI pin 6 TXC to RF RFI pins 8 9 TXQ TXQ to RF RFI pins 11 12 TXI TXI to RF RFI pin 14 AFC to RF RFI pins 20 23 28 29 PDATA 5 0 RFI pin 51 DAX to ASIC ASIC D300 pin 105 SYNTHPWR to RF ASIC D300 pin 104 TXP to RF ASIC D300 pin 106 TXPPWR to RF ASIC D300 pin 111 SENAT to RF ASIC D300 pin 112 SENAR to RF ASIC D300 pin 113 SDAT to RF ASI...

Page 13: ...ignal missing YES Earphone signal missing YES NO Microphone and earphone signal missing CODEC pin 15 SYNC from ASIC CODEC pin 16 CODEC_CLK from ASIC DSP pins 79 82 PCMCOSYCLKX from ASIC DSP pins 60 81 PCMDATRCLKX from ASIC DSP pin 80 CODEC_CLK CODEC pin 21 HF_MIC CODEC pin 22 MIC CODEC pin 10 PCMOUT CODEC pins 6 7 LSP CODEC pins 3 4 EAR CODEC pin 14 PCMIN DSP D200 pin 78 ...

Page 14: ...ible to operate the parts dynamic to check the switching between the different modes and that is more or less sufficient to tell if the RF is OK or not The following descriptions all starts with a simple and top level check If that fails or if the radio still has a malfunction then the checks goes deeper and deeper into the circuits to help finding the circuit that is responsible for the malfuncti...

Page 15: ...signal AGC1 to AGC4 low AGC4 2 5 V in burst N702 pin1 and pin14 4 8 V 0 2 V Enable pin 6 4 V Input pin12 13 50 dBm 71 MHz Output pin 4 5 10 dBm 71 MHz 1 4 Check UHF mixer LO C934 9 dBm 3 dB 1014 MHz Signal in C722 50 dBm 947 07 MHz 57 dBm input Signal in C722 30 dBm 947 07 MHz 37 dBm input Signal out C726 57 dBm 70 93 MHz 1 5 Check 71 MHz amp Output to filter 35 dBm 70 93 MHz 2 AFC Input 57 dBm ch...

Page 16: ... Signal should be about 30 mVPP and vary as the AGC operates If not check the signal path and the LO signals as above 3 Noise and sensitivity Checks the overall RX performance except real demodulation Use F2 to measure clipping level and difference between I Q Disconnect or switch off the RF signal from the generator Use F3 to measure SNR and Sensitivity Clipping SNR 50 SNR 20 Sensitivity 103 dBm ...

Page 17: ...e Power tuning Coefficients from 0 8 at level 2 to about 0 1 at level 15 Tolerance of 0 1 at level 2 to 0 050 at level 15 The control signal should follow the RF amplitude with a maximum of 4 to 6 V at level 2 and 2 to 2 5 V at level 15 1 2 TX buffer and level regulator Via PCLocals select local mode RF control TX mode Power level 10 23 dBm Operation mode burst Data type random Continuous mode cha...

Page 18: ...anted signal Check the LO generating mixer UHF TX and VHF RX PLL the ampli fier and the filter UHF LO 5 dBm 5 dB 1014 MHz VHF RX PLL 5 dBm 5 dB 116 MHz Check the modulating input balanced pairwise for I and Q about 1 Vpp for every signal d c at 2 4 V Check the power and enable to the modulator Check the UHF and VHF synthesizers 2 Modulation spectrum Select I and Q TUNING in PCLocals Measure with s...

Page 19: ...t J902 26MHz ref 26 MHz 2 VPP Measure at the collector of V904 UHF TX and of V906 LO UHF to see that they alternately are on With a probe connected to the spectrum analyzer check the RF sig nals The level when they are active should be about 6 dBm VHF Synthesizer Via PCLocals select local mode RF control TX mode Power level 10 23 dBm Operation mode burst Data type random Continuous mode channel 60...

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