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Nokia RH-42, Troubleshooting Instructions

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Nokia RH-42 Troubleshooting Instructions Download Page 24

RH-42

Troubleshooting Instructions

CCS Technical Documentation

Page 24

 

Nokia Corporation          Confidential

Issue 2 09/2003

TDMA800

Since the same physical signal path is used for both analog and digital modes at the 
lower band, there is no need for additional troubleshooting in the digital mode. So if the 
digital mode at the lower band is not working properly, start the analog mode trouble-
shooting.

Transmitter Troubleshooting

General instructions for TX troubleshooting

Always use an RF cable connected from an external RF connector to the analyzer via (rf-
power) attenuator. This is important to protect the analyzer against excessive RF power 
and not to allow leakage of undesired RF power into the cellular frequencies.

1 Start the Phoenix software and select the TX mode under 

Testing

 (AMPS, 

DAMPS). 

2 It is useful to select the mid channel (383 for AMPS/DAMPS) and the power 

level 2. 

Note: After any component change, tune the phone with the Phoenix autotune SW.

Path of the transmitted signal

l

AMPS/DAMPS

UEM TX I/Q DA-converters -> I/Q modulator and Digital gain step amplifier (Taco) -> 
IF-BPF -> Upcodriver (Taco) -> Balun->BPF -> PA -> Coupler (Power detector) > 
Duplex-filter -> Diplexer -> EXT RF Connector Switch -> Antenna

Fault-finding charts for the transmitter

AMPS

1 Start the Phoenix software and set the phone to the analog mode by using RF 

Test UI. 

2 Set the channel to 383 and the power level to 2. 

3 Connect the RF cable to the Ext RF connector switch.

4 Connect the cable to the Spectrum analyzer input.

5 Measure the RF level. 

Note: Insertion loss of the cable and attenuations.

Summary of Contents for RH-42

Page 1: ...CCS Technical Documentation RH 42 Series Transceivers Issue 2 09 2003 Confidential Nokia Corporation Troubleshooting Instructions ...

Page 2: ...RH 42 Troubleshooting Instructions CCS Technical Documentation Page 2 Nokia Corporation Confidential Issue 2 09 2003 ...

Page 3: ...y Keyboard lights do not work 18 Display does not work 19 Buzzer does not work 20 Keyboard does not work 20 Receiver Troubleshooting 20 General instructions for RX troubleshooting 20 Path of the received signal 20 Fault finding charts for receiver chain 21 Transmitter Troubleshooting 24 General instructions for TX troubleshooting 24 Path of the transmitted signall 24 Fault finding charts for the t...

Page 4: ...RH 42 Troubleshooting Instructions CCS Technical Documentation Page 4 Nokia Corporation Confidential Issue 2 09 2003 ...

Page 5: ... mode when the supply voltage is connected to the phone The power can be switched on by 1 Pressing the power key 2 Connecting the local test mode resistors to the bsi btemp lines and connecting the battery voltage to the phone 3 Connecting a charger 4 Phone s internal functions Real time clock alarm In the local and test mode the baseband can be controlled through MBUS or FBUS FBUS is recommended ...

Page 6: ...erface Display Lights Buzzer Keyboard Power up faults Power up sequence 1 The UEM acts as a HW master during start up Vbatt limits 2 1V for internal state machine 3V triggering whole startup Regulator sequencing HW core regulators on Vio Vcore VR3 Vflash1 These regulators supply the processors memory chip interfaces and clock source in RF Reset releasing delay Supply voltages stabilize to their UE...

Page 7: ...on for the FDL mode Flash Down Load If there is an executable code in FLASH and there is no reason for FDL the MCU starts running the MCU program from FLASH 3 MCU runs the FLASH MCU code The phone initialization user interfaces internal blocks etc Core regulator voltage setting for required DSP speed Initializes the DSP and concerning HW Releases DSP reset DSP starts running Note In the following ...

Page 8: ...e battery volt age is supplied 3 Software running Default value for Vcore is 1 5 volts when the software is running Cbus 1 08MHz clock starts running Phone does not start up normally or does not stay on Note In case of power up faults it is not possible to force the phone on by disabling the watchdog Instead measurements should be taken immediately when the power key is pressed or when the bat ter...

Page 9: ...206 R207 C220 C240 Check X101 Check G790 missing or misaligned Check 19 44MHz RF clock from C420 Check C420 Check 19 44MHz from G790 Check R792 C792 C793 Change G790 Change N801 Measure VBAT from C261 Change UEM D200 Check that purx goes up to 1 8V Measure J406 it should be 1 08MHz Change UPP D400 Reflash phone Go to Flash Failure flowchart FAIL OK OK OK FAIL OK VANA and VR3 missing FAIL FAIL OK O...

Page 10: ... to MCU 5 After reset is released UPP checks if there is a request for the Bootstrap code that resides in the UPP ROM 6 The request for Bootstrap is the MBUS pulled down by the prommer if the boot strap is not requested the bootstrap code jumps to FLASH SW 7 If the Bootstrap code is requested UPP enters the Flash mode and sets FbusTX to 0 as an acknowledgement to the prommer This is an indication ...

Page 11: ... when the Phone is not connected to the Prommer PURX also to Taco VR3 Rfclock VCTCXO Taco UPP Mbus from Prommer UEM UPP MbusRx SA1 FbusTx from UPP UEM Prommer SA1 C103 Boot serial line fail Mbus from Prommer UEM UPP MbusRx SA0 FbusRx from Prommer UEM UPP FbusTx from UPP UEM Prommer C104 MCU ID message sending failed in the Phone FbusTx from UPP UEM Prommer C105 The Phone has not received Secondary...

Page 12: ...und C383 C583 C683 The Prommer has not received Phone acknowledge to the message C383 during algorithm download to target phone C583 during erasing C683 during programming Flash UPP Signals between UPP Flash 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 betwee...

Page 13: ...he Audio test box JBA 8 is needed The Audio loop Audio test Ext In Hp Out must be switched on by the Phoenix service soft ware This loop will connect audios only through the UEM In this case the UPP is not used In case the internal microphone XEAR fails Feed the tone to the microphone and mea sure the signal from the XEAR line The Audio test box JBA 8 is needed The Audio loop Phone doesn t start c...

Page 14: ...e the UPP is not used 3 Run the audio loop self test with Phoenix BB Self Tests ST_EAR_DATA_LOOP_TEST This loop will test the ear data mic data lines between the UPP and the UEM Earpiece or external microphone line does not work Figure 4 Fault tree earpiece failure E arpiece does n t work R un audio loop s elf tes t with Phoenix Feed 1K Hz to XMIC by J B A 8 and meas ure from earpiece Check R 157 ...

Page 15: ...idential Page 15 Microphone or XEAR line does not work Figure 5 Fault tree microphone failure Microphone does n t work R un audio loop s elf tes t with Phoenix Feed 1K Hz to MIC by J B A 8 and meas ure from XE AR Check R 156 C151 C152 C157 L164 Check microphone Change UE M Change UPP Fail OK Fail OK OK ...

Page 16: ...high to low when no acces sory is connected 3 When the headset HDC 5 is connected the hookint value should be between 600 and 800 Figure 6 Fault tree accessory detection Accessory detection doesn t work normally Check Headint ad value with Phoenix no accessory connected Headint 0 Use XMIC switch on MJS 18 and check hookint ad value Should go from high 1000 to low 0 Check R151 and C160 Check R152 C...

Page 17: ... clock causes Entering sleep mode fails higher current consumption shorter standby time Baseband self tests cannot be run Phone clock on display does not function properly Figure 7 Fault tree sleep clock Sleep mode not working Measure sleep clock Measure sleep clock from B200 Check C209 and C210 Change B200 Change UEM D200 Change UPP D400 Fail Fail OK OK OK ...

Page 18: ...oard lights do not work Figure 8 Fault tree Display Keyboard lights Dis play K eyboard lights are not working Check R 300 Dis play and R 301 K eyboard R eplace res is tor s Check LE Ds V300 V303 Dis play and V304 V309 K eyboard R eplace LE D s Us e Dis play Tes t in Phoenix to s et lights ON OFF R eplace UE M Fail OK Fail OK Fail ...

Page 19: ...s s capacitors loos e or broken R eplace Dis play Module Check PWB and elas tomer connector Clean PWB and replace elas tomer if needed R un LCD tes t in Phoenix B B S elf Tes ts S T_LCD_TE S T Check capacitors C302 C304 R eplace capacitor s R eplace Dis play Module R eplace elas tomer Us e Dis play Tes t in Phoenix to check if dis play works R eplace Dis play Module Fail OK OK OK OK Fail Fail Fail...

Page 20: ...Keyboard test in Phoenix to see if the pressed key is identified If it is not identified change the UPP D400 Receiver Troubleshooting General instructions for RX troubleshooting Start the Phoenix software and use it to start the required RX mode of the mobile phone The troubleshooting flowchart is divided into three steps 1 general checking 2 local checking and 3 RX chain checking Note Before chan...

Page 21: ...MPS Apply 881 49MHz ch 383 116dBm 8kHz dev 1 kHz sine to external RF connector X900 Connect HS to cellular tester Open AF 1kHz sine meas SINAD AF 12 dB Check UHF Vc from C773 V 1 8 2 1V Check RXVHF Vc from C740 V 0 7 1 3 Apply 881 49 MHz 30dBm sine signal to external RF connector X900 Start troubleshooting Start troubleshooting AMPS RX chain OK Y Y N N Y N Y ...

Page 22: ...xer Z907 Check input level at LNA input N801 pin N14 Change duplex filter Z906 Change RX800 band filter Z820 Change Taco N801 Check RF level at RX800 band filter input Z820 Check RF level at MIX1Ain P N Y N N Y N Y N Y N Y Note Check all soldering and components in antenna circuit before changing Note Check all soldering and discrete components of front end Note Check all soldering and discrete co...

Page 23: ...34 06MHz Start synthesizer troubleshooting Change Taco N801 Check RF level at RX IF filter output at 135 54MHz Change RX IF filter Z830 Check RX I and Q signals at I J801 J803 and Q J804 J802 Check RF level by L730 without having electrical contact at 271 08MHz Start synthesizer troubleshooting Change Taco N801 Check UEM and start baseband troubleshooting N N Y Y N Y N N Y Y Note Check all discret...

Page 24: ...d RF power into the cellular frequencies 1 Start the Phoenix software and select the TX mode under Testing AMPS DAMPS 2 It is useful to select the mid channel 383 for AMPS DAMPS and the power level 2 Note After any component change tune the phone with the Phoenix autotune SW Path of the transmitted signall AMPS DAMPS UEM TX I Q DA converters I Q modulator and Digital gain step amplifier Taco IF BP...

Page 25: ...sual check of TX PA TX SAW Duplex filter Passive components Start synthesizer troubleshooting Check supply voltage VR2 VBATTRF VR5 IPA1 Check TXi q signals test points J901 J904 Check Z960 input and output power out 20dBm 3 6dB IL 2dB Check TX RF 836 49MHz output power from balun T961 input RF 0dBm 6dB Change Taco Change Taco or Z960 Check UEM baseband Check UEM and UPP baseband OK AMPS PL2 CH383 ...

Page 26: ...L 3dB Is ltot 700 900 mA Check PA output power and gain Output power 28dBm Gain 30dB Check PWRDET N930 insertion loss IL 0 3dB Check duplexer Z906 diplexer Z907 and RF connector X900 insertion loss Dupl IL 2 2dB Dipl 0 35dB RF conn 0 1dB Start power control troubleshooting Change Z906 or Z907 or RF connector Change PWRDET N930 Change PA N901 Change TX SAW filter Z905 or T961 NOK OK NOK OK NOK OK N...

Page 27: ...trol loop The detected voltages are illustrated in the following table and diagram Note DAC values may vary about 20 800A 800D Pout TXPWRDET Pout TXPWRDET PL dBm dac mV dBm dac mV 2 24 8 712 1984 27 3 779 2201 3 21 6 512 1437 23 3 476 1312 4 18 5 340 961 19 3 284 759 5 14 5 239 686 15 3 171 462 6 10 5 180 510 11 3 98 271 7 6 5 141 415 7 3 56 151 8 3 3 30 84 9 0 7 14 46 0 4 7 5 16 Is PWRDET vs outp...

Page 28: ...08 MHz and TX VHF is fixed to 271 08 MHz All locals are locked to stable 19 44 MHz reference oscillator The frequency range for 2 GHz UHF VCO is 2009 1 MHz 2125 53 MHz The output fre quency range for the lower band is from 2009 16 MHz to 2059 02 MHz A practical way to check out synthesizer status is by measuring control voltage of the VCO from the Integrator capacitor If voltage is stable and reas...

Page 29: ... receiver Intermediate frequency RX VHF has one fixed frequency 271 08 MHz Operating frequency is locked in Phase locked Loop RX VHF PLL output signal is integrated in Taco There are only four external components VCO coil L730 and loop filter components C740 C741 and R741 2 Change VCTCXO START HERE Is VCTCXO oscillating 19 44MHz OK 1 Check voltage at C792 2 78V Check resistor R792 OK 1 No OK No OK...

Page 30: ...ency TX VHF VCO has one fixed frequency 361 08 Operating frequency is locked in Phase locked loop TX VHF VCO output signal is divided by 2 and fed to the modulator Figure 16 Fault tree TX VHF 3 Replace Taco 1 START HERE Is frequency locked to 271 08MHz OK 2 Check resonator components L730 C740 C741 R741 OK Yes 1 No 2 No OK 3 Replace Taco 1 START HERE Is frequency locked to 361 08MHz OK 2 Check res...

Page 31: ...of an external 2GHz VCO module with loop filter compo nents and integrated PLL parts in Taco Integrated charge pump circuit allows analog and digital operation modes The VCO Oscillation frequency is from 2009 1 MHz to 2125 53 MHz The output frequency of the VCO module depends on the DC control volt age which is controlled by PLL circuit inside Taco Figure 17 Fault tree UHF Synthesizer START HERE I...

Page 32: ...RH 42 Troubleshooting Instructions CCS Technical Documentation Page 32 Nokia Corporation Confidential Issue 2 09 2003 ...

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