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Nokia NHM–7 Series Troubleshooting Instructions

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PAMS Technical Documentation
NHM–7 Series Transceivers
Troubleshooting
Instructions
E Nokia Corporation
Issue 1 10/2001

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Summary of Contents for Nokia NHM–7 Series

  • Page 1 PAMS Technical Documentation NHM–7 Series Transceivers Troubleshooting Instructions E Nokia Corporation Issue 1 10/2001...

  • Page 2: Table Of Contents

    FM Radio signals ........E Nokia Corporation Page 2...

  • Page 3: Transceiver Troubleshooting

    RED colored test points are connected to the lines from FPS–8 and have 2.7 V logic level. BLUE test points are connected to FM radio lines and have 1.8 V logic level. E Nokia Corporation Page 3 Issue 1 10/2001...

  • Page 4: Measurement Points

    The first thing to do is carry out a through visual check of the module. En- sure in particular that: a) there are not any mechanical damages b) soldered joints are OK E Nokia Corporation Page 4 Issue 1 10/2001...

  • Page 5: Main Troubleshooting Tree

    Main troubleshooting tree Phone totally Phone is dead dead Flash programming Flash doesn’t work faults Phone doesn’t Phone is start up or the phone is jammed jammed Charging Charger doesn’t work TOP 2 E Nokia Corporation Page 5 Issue 1 10/2001...
  • Page 6 NHM–7 PAMS Technical Documentation Troubleshooting Instructions TOP 2 Phone doesn’t read SIM card SIM card Audio Audio faults faults Display Display or LED’s faults doesn’t work Keypad Keypad doesn’t work faults E Nokia Corporation Page 6 Issue 1 10/2001...

  • Page 7: Phone Is Dead

    Flash faults Phone current is ~ 54 mA Check BSI line Is phone in LOCAL Change UEM X101, C241, R203, C109, MODE ? R202 Are they OK ? Repair OK retest E Nokia Corporation Page 7 Issue 1 10/2001...

  • Page 8: Flash Programming Doesn't Work

    Change UEM from testpoint J411 Is it High (1.8V) ? Change UPP The Phone does not set Change UPP Flashbus TXD line low after the line has been high. Flash faults page 2 E Nokia Corporation Page 8 Issue 1 10/2001...
  • Page 9 2 Change Wrong manufactor ID FLASH and Device ID Phone is Is the phone totally dead ? dead Phone doesn’t start up Phone is or the phone jammed is jammed ? Retest E Nokia Corporation Page 9 Issue 1 10/2001...

  • Page 10: Phone Is Jammed

    Is it OK ? Is it OK ? change G660 Check R420, C420 if OK change N600 Measure PURX signal from testpoint J402 Change UEM Is it high (1.8V)? Jammed Page 2 E Nokia Corporation Page 10 Issue 1 10/2001...
  • Page 11 Is it OK ? from testpoint J412 Is it OK ? Measure FBUSTX signal during phone info read Change UPP from testpoint J411 Is it OK ? Change LA5 Retest module Change UEM E Nokia Corporation Page 11 Issue 1 10/2001...

  • Page 12: Charging Fault

    X101,C109 (Compare it to ambient R202, C240, temperature) R203 and line. Is it ~ 25 C (0319) ? Remove (fuse) F100 and measure current. Change UEM Is it ~350...390 mA ? Retest E Nokia Corporation Page 12 Issue 1 10/2001...

  • Page 13: Sim Card Is Out Of Order (Insert Sim Card)

    –> Change UEM Check SIM Check SIM lines. power UP sequency If OK –> Change R388. (Page 35 figure 19) If still fail –> Change UEM Is it OK ? Change UPP E Nokia Corporation Page 13 Issue 1 10/2001...

  • Page 14: Audio Fault

    –> Change UEM Check L106, C112, R161, C163, R166, Measure MICB2 C165, R167 and voltage from XMICP pads line. (L106) . If OK Is it ~2.2V ? –> Change UEM Audio Earpiece faults 2 E Nokia Corporation Page 14 Issue 1 10/2001...
  • Page 15 Measure sine signal Measure sine signal from UEM (R156) Change UEM. from earpiece pads. Is it ~130mVp–p ? Is it ~880mVp–p ? Check R156, C153, C155, R166, R167, Retest C163, R161 and line. E Nokia Corporation Page 15 Issue 1 10/2001...
  • Page 16 MICP pads. C168, C166, Is it ~2.1V ? C215 and line. If OK –> Change UEM Check C151, R157, C105, C154 and line. If OK –> Change UEM Audio faults 3 E Nokia Corporation Page 16 Issue 1 10/2001...
  • Page 17 Use Phoenix Audio Test. Set Buzzer volume ON. Measure Buzzer Change control signal BUZZER from BUZZER (C307). (B301) Is it 1kHz pulses ? Check C306, C307, C308 and line. IF OK –> Change UEM E Nokia Corporation Page 17 Issue 1 10/2001...

  • Page 18: Display Fault

    Is it OK? Check control signal line if OK Change UEM Measure PWM LED‘s control signal from UEM Check R305, Is it 128 Hz V300, V329 ~3.8Vp–p ? and line Display faults 2 E Nokia Corporation Page 18 Issue 1 10/2001...
  • Page 19 It is OK? Check control signal line. If OK, Change UEM Measure PWM LED‘s control signal from UEM Check R305, Is it 128 Hz V301, V329 ~3.8Vp–p ? and line Display faults 3 E Nokia Corporation Page 19 Issue 1 10/2001...
  • Page 20 If OK, Is it OK? Change UEM Measure Check C302, VOUT voltage. X300 and lines. Is it ~8.1V? Check X300 Measure and lines. XRES, XCS. If OK, change Is it ~1.8 V? E Nokia Corporation Page 20 Issue 1 10/2001...

  • Page 21: Keypad Fault

    Change UEM Measure voltage from S300 when Phone is Chech S300. power key is pressed. dead Is it OK ? Is it HIGH ? Change S300 Phone is jammed Keypad faults 2 E Nokia Corporation Page 21 Issue 1 10/2001...
  • Page 22 UPP Check ROW0 – When keypad 4 Lines, X303. is pressed, the led’s are If OK change turned on ? Z301. If still fail change UPP Keypad Display faults 3 faults E Nokia Corporation Page 22 Issue 1 10/2001...
  • Page 23 If still FAIL change UPP Check S302 and COL4 line. If OK change Z301. Measure COL4 If still FAIL from S302 when change UPP S302 is pressed Is there 50us pulse ? Change UPP E Nokia Corporation Page 23 Issue 1 10/2001...

  • Page 24: Rf Troubleshooting

    . When using RF probe it is good to use metallic tweezers to connect probe ground to PWB ground as close to measurement point as possible. E Nokia Corporation Page 24 Issue 1 10/2001...

  • Page 25: Rf Key Components

    Dual RX SAW DCS RX SAW VCO balun 26MHz XO Dual coupler 4GHz VCO Antenna switch Antenna pad FM receiver IC FM IF filter 2 Dual PA FM IF filter 1 FM diskriminator E Nokia Corporation Page 25 Issue 1 10/2001...

  • Page 26: Pcb Test Points

    FM audio 1800 PA bias Vtune TX_Q_0 VR1a 900 Mod out LCtank1 FMdiscr. LCtank2 1800 Mod out IF out 1 900 PA in IF out 2 13M clock 1800 PA in E Nokia Corporation Page 26 Issue 1 10/2001...

  • Page 27: Transmitter

    – Set Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band (Defaults) – Set Tx PA mode to ”Free” (Default) – Set power level to 5 (Default = 19) on GSM900 or to 0 (Default = 15) on GSM1800 E Nokia Corporation Page 27 Issue 1 10/2001...

  • Page 28: Transmitter Troubleshooting Diagram

    NHM–7 PAMS Technical Documentation Troubleshooting Instructions Transmitter troubleshooting diagram E Nokia Corporation Page 28 Issue 1 10/2001...
  • Page 29 NHM–7 PAMS Technical Documentation Troubleshooting Instructions E Nokia Corporation Page 29 Issue 1 10/2001...
  • Page 30 NHM–7 PAMS Technical Documentation Troubleshooting Instructions E Nokia Corporation Page 30 Issue 1 10/2001...

  • Page 31: Transmitter Signals

    TX_Q_0, Tx on, Random data, Burst mode 900/1800 antsw tx contr, Tx on, Burst mode 900/1800 PA bias, Tx on, Burst mode 900/1800 PA ctrl, Tx on, Burst mode, High power level E Nokia Corporation Page 31 Issue 1 10/2001...
  • Page 32 C E N T E R 8 9 7 . 4 0 0 MH z S P A N 2 . 0 0 0 MH z Tx out signal, 900 band, burst mode, channel 37 E Nokia Corporation Page 32 Issue 1 10/2001...

  • Page 33: Receiver

    – TX on local mode – TX on local mode – example power measured with 1 kOhm – example power measured with 1 kOhm passive RF–probe –22 dBm passive RF–probe –20 dBm E Nokia Corporation Page 33 Issue 1 10/2001...

  • Page 34: Synthesizer

    – Set Active unit to ”Rx” (Default = ”Rx”) – Set Operation mode to ”Continuous” (Default = ”Burst”) – Set Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band (Defaults) E Nokia Corporation Page 34 Issue 1 10/2001...

  • Page 35: Synthesizer Troubleshooting Diagram

    NHM–7 PAMS Technical Documentation Troubleshooting Instructions Synthesizer troubleshooting diagram E Nokia Corporation Page 35 Issue 1 10/2001...

  • Page 36: Synthesizer Signals

    NHM–7 PAMS Technical Documentation Troubleshooting Instructions Synthesizer signals 26MHz XO out 13MHz clock 4GHz VCO ctrl 4GHz VCO ctrl 900 RX, channel 124, continuous mode 1800 TX, channel 512, continuous mode E Nokia Corporation Page 36 Issue 1 10/2001...
  • Page 37 3 . 6 1 0 4 0 0 0 G H z S P A N 2 . 0 0 0 MH z 4GHz VCO output, 1800 band, RX on, continuous mode E Nokia Corporation Page 37 Issue 1 10/2001...

  • Page 38: Fm Radio Troubleshooting

    NHM–7 PAMS Technical Documentation Troubleshooting Instructions FM Radio troubleshooting FM Radio component layout Components L101, C101 and C102 are not shown in picture. Compo- nents are placed in baseband section. E Nokia Corporation Page 38 Issue 1 10/2001...

  • Page 39: Fm Radio Troubleshooting Diagram

    – Deviation, ∆ f , 75 kHz – Modulating frequency f , 1,000 kHz (RF generator internal) Note 2. Use 10x probe. Compare measured RF signal level to a known good product. E Nokia Corporation Page 39 Issue 1 10/2001...

  • Page 40: Fm Radio Signals

    1 0 . 7 0 0 0 MH z S P A N 1 . 0 0 0 MH z IF out 1 – with FM test signal. IF out 2 – with FM test signal. E Nokia Corporation Page 40 Issue 1 10/2001...

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