Note: Most of the baseband repair actions require removing the baseband shield. The shield must not be removed unless separately authorized by the program. Note: The phone’s ESN has to re-written to the UEM, if the UEM is replaced. This can be done only in Central Service. Nokia Corporation Issue 2 09/2003 Confidential Page 5...
• Reset releasing delay • Supply voltages stabilize to their UEM HW default values • RFCLK grows to full swing • The core is ready to run but waiting for the PURX release Nokia Corporation Page 6 Confidential Issue 2 09/2003...
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• Releases DSP reset -> DSP starts running Note: In the following figure, the RF_Clk frequency appears to be lower than 19.44 MHz because of a too low oscilloscope sampling frequency (2kS/s). Figure 1: Power up sequence Nokia Corporation Issue 2 09/2003 Confidential Page 7...
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The easiest way to check if the software is running when the phone takes an abnormal amount of current is to measure the cbusclk and Vcore. The Dbus clock (programmable 9.72MHz) is not automatically visible in the test and local modes. Nokia Corporation Page 8 Confidential Issue 2 09/2003...
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Measure J406 (it Reflash phone FAIL Programming fails should be 1.08MHz) Change Go to Flash Programming OK but phone doesn't start UPP (D400) Failure flowchart Figure 2: Fault tree, phone does not power up Nokia Corporation Issue 2 09/2003 Confidential Page 9...
9 Prommer then sends the Algorithm Code corresponding to the HW parameters, and this algorithm, when run in UPP, takes over handling the MCUSW transfer to Flash. 10 12 volts can be supplied to Vpp (by the prommer) to speed up flashing. Nokia Corporation Page 10 Confidential Issue 2 09/2003...
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IDs received from the target phone." A387 "The MCU ID in the MCUSW.” C601 "The prommer has detected that Vpp voltage Vpp from prommer - >Flash level has dropped below the limit" Nokia Corporation Issue 2 09/2003 Confidential Page 11...
If charging fails when the LCH-9 is used, and works with ACP-7 and ACP-8, check that the charge control pin of the system connector is connected to the ground. Nokia Corporation Page 12 Confidential...
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 Nokia Corporation Issue 2 09/2003 Confidential Page 13...
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P hoenix meas ure from earpiec e C hec k R 157 F ail C hange UP P C hec k earpiec e C hange UE M Figure 4: Fault tree, earpiece failure Nokia Corporation Page 14 Confidential Issue 2 09/2003...
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C hec k R 156, C 151, F ail C 152, C 157, L 164 C hec k mic rophone C hange UP P C hange UE M Figure 5: Fault tree, microphone failure Nokia Corporation Issue 2 09/2003 Confidential Page 15...
V 304...V 309 (K eyboard) Us e Dis play T es t in P hoenix to s et lights R eplac e UE M F ail ON/OF F Figure 8: Fault tree, Display/Keyboard lights Nokia Corporation Page 18 Confidential Issue 2 09/2003...
P hoenix to c hec k if R eplac e elas tomer F ail Module dis play works F ail R eplac e Dis play Module Figure 9: Fault tree, Display does not work Nokia Corporation Issue 2 09/2003 Confidential Page 19...
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 . Nokia Corporation Page 26 Confidential Issue 2 09/2003...
3 Connect the RF cable to the Ext RF connector. 4 Connect the cable to the Spectrum analyzer input. 5 Measure the RF level. Note: Insertion loss of the cable and attenuations. Nokia Corporation Issue 2 09/2003 Confidential Page 27...
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Change Taco or Z960 or Z960 out:-20dBm+3/-6dB IL:2dB IL:2dB Check TX RF from balun T961 Taco (836.49MHz) output input RF:0dBm+/-6dB power from balun Change Taco T961 input RF: 0dBm+/-6dB Nokia Corporation Page 28 Confidential Issue 2 09/2003...
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(Z907) and RF connector (X900) Change Z906 or Z907 insertion loss. or RF connector Dupl IL ~2.2dB Dipl ~0.35dB RF conn ~0.1dB Start power control troubleshooting Figure 12: Fault tree. Transmitter troubleshooting Nokia Corporation Issue 2 09/2003 Confidential Page 29...
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Check TX IF input power Change Taco or Z960 (181.80MHz)@Z960 Taco IF: -20dBm+3/-6dB Check TX RF (1879.98MHz) output Change Taco power @T960 input Taco RF: 0dBm+/-6dB Check Z961 input and output power Change Z961 IL:-3dB Nokia Corporation Page 30 Confidential Issue 2 09/2003...
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(Z906), diplexer (Z907) and RF connector (X900) Change Z906 or Z907 insertion loss or RF connector Dupl IL ~2.2dB Dipl ~0.35dB RF conn ~0.1dB Start power control troubleshooting Figure 13: TDMA 1900 troubleshooting Nokia Corporation Issue 2 09/2003 Confidential Page 31...
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19.3 14.5 15.3 15.3 10.5 11.3 11.3 -0.7 -0.7 §0 -4.7 -4.7 Note: DAC values may vary about +- 20% Note: TXPWRDET is the difference between TX on burst and off burst. Nokia Corporation Page 32 Confidential Issue 2 09/2003...
Taco. It is used as a reference signal in Taco and also fed out as buffered clock signal to UPP. All synthesizers use divided 19.44 MHz signal as a reference signal for Phase locked loop to provide correct LO frequency. Nokia Corporation Issue 2 09/2003 Confidential...
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. Nokia Corporation Page 34 Confidential...
VHF VCO output signal is divided by 2 and fed to the modulator. 1. START HERE 3. Replace Taco Is frequency locked to 361.08MHz? 2. No 1. No 2. Check resonator components: L746, C720, C721, R721 Figure 18: Fault tree: TX VHF Nokia Corporation Issue 2 09/2003 Confidential Page 35...