User Guide

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Nokia Customer Care

6-Troubleshooting

Instructions

Summary of content (52 pages)

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RH-59/60 Nokia Customer Care Table of Contents Page No Baseband troubleshooting................................................................................. 7 Baseband test points ......................................................................................... 7 Troubleshooting diagrams ................................................................................. 7 Phone is dead ....................................................................................................
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RH-59/60 Nokia Customer Care PCN Transmitter general instructions for PCN TX troubleshooting ................. 47 Synthesizer ...................................................................................................... 48 26 MHz Reference Oscillator ( VCXO ) ......................................................... 48 VCO ............................................................................................................... 48 Troubleshooting diagram for PLL Synthesizer ..................
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RH-59/60 Nokia Customer Care Fig 37 Fig 38 Fig 39 Fig 40 Fig 41 Fig 42 Fig 43 Fig 44 Fig 45 Fig 46 Fig 47 Fig 48 Fig 49 RX measurements point at the RX/TX Switch - Z700 ................................ 40 Measurements points at the RX-Filters – Z601/Z602 ................................ 41 RX I/Q Signals, baseband shielding can UEM (D200) ............................... 41 TX measuremnet points in the PA ( N700 ) shielding can ........................
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RH-59/60 Nokia Customer Care Baseband Troubleshooting ■ Baseband test points This document contains the Nokia 2600 troubleshooting diagrams. Test points are described and listed in the A3 schematic diagrams. ■ Troubleshooting diagrams In this section, Troubleshooting diagrams is provided for the most common problems of the Nokia 2600 NOTE : Since both D200 (UEM) and D400(UPP) are underfilled, they can not be replaced. If either D200 or D400 is defective, the whole PWB has be discarded.
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RH-59/60 Nokia Customer Care ■ Phone is dead This means that the phone do not draw any current at all when supply is connected and/or powerkey is pressed. It is assumed that the voltage supplied is 3.6 VDC. The UEM will prevent any functionality what so ever at battery/supply levels below 2.9 VDC.
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RH-59/60 Nokia Customer Care ■ Flash programming do not work The flash programming can only be done via the pads on the PWB (J396). In case of Flash failure in FLALI station, problem is most likely related to SMD problems. Possible failures could be short-circuit of balls under µBGAs (UEM, UPP, FLASH). Missing or misaligned components. In flash programming error cases the flash prommer can give some information about a fault.
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RH-59/60 Nokia Customer Care ■ Power does not stay on or phone is jammed If this kind of failure is presenting itself immediately after FLALI, it is most likely caused by ASICs missing contact with PWB. If for some reason the MCU does not service the watchdog register within the UEM, 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.
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RH-59/60 Nokia Customer Care ■ Display information : "Contact Service" This error can only happen at power up where several self-tests is run. If any of these test cases fails the display will show the message: "Contact Service". It's individual test cases so the below lineup of error hunting's has no chronological order. Use common sense and experience to decide which test case to start error hunting at.
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RH-59/60 Nokia Customer Care ■ The phone do not register to the network, or the phone cannot make a call If the phone doesn't register to the network, the fault can be in either BB or RF. Only few signals can be tested since several signals is 'burried' in one or more of the inner layers of the PWB. First of all check that SIM LOCK is not causing the error by using a Test-SIM card and connect the phone to a tester.
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RH-59/60 Nokia Customer Care ■ SIM related faults Insert SIM card fault The hardware of the SIM interface from UEM (D200) to the SIM connector (X387) can be tested without a SIM 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”. Figure 6:SIM troubleshooting Display shows : "Insert SIM Card" Yes X387 Verify that phone checks for 1,8V-SIM, and then 3V-SIM during power-up.
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RH-59/60 Nokia Customer Care SIM-Card rejected The error ”SIM card rejected” means that the ATR message received from SIM card is corrupted, e.g. data signal levels 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. Normal SIM power-up sequence Ch1 : VSIM Ch2 : RESET Ch3 : CLOCK Ch4 : DATA Figure 8:Signal diagram 14 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care ■ Audio related faults 1: Earpiece and microphone Figure 9:Top: Earpiece troubleshooting, bottom: Microphone troubleshooting Earpiece do not work Replace : Earpiece Error still present Z150, R161 Check Z150, R161 is working correctly (no short/open-circuit) Check : No R386, PWB.
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RH-59/60 Nokia Customer Care ■ Audio related faults 2: Headset Figure 10:Headset troubleshooting Headset earpiece do not work and the isn't any mechanical problem R183, Z102 Check R183, Z102 is working correctly (no open-circuit) No Replace : C183 and/or Z102 Defective D200* Headset microphone do not work and the isn't any mechanical problem R166 Check voltage level on R166 towards UEM (bias) = 2,1V No Replace : C183 and/or Z102 Yes R151 Check voltage level on R151 towards UEM (bias) = 1,0V - 1,4V
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RH-59/60 Nokia Customer Care ■ Charging failure troubleshooting Figure 11:Charging troubleshooting 1 Phone is OFF - battery is completely empty (<=3,1VDC) and no current from charger when connected L100 VCHAR > 2,1VDC Check : No F100, L100, V100, C100, R200, System-connector. No F100, L100, V100, C100, R200, System-connector.
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RH-59/60 Nokia Customer Care ■ Charging troubleshooting 2 Figure 12:Charging troubleshooting 2 Display info when charger is connected : "Not charging" R206 Voltage on R206 towards D200 is ~0,8VDC when power is connected. (BSI must be 75K) No Check : X105, R202, R206, C240. Yes R207 Voltage (use scope) on R207 towards D200 is ~0,9VDC at peak. (BSI must be 47K) No Check : X105, R202, R207, C220. Yes R200 Voltage on R200 towards D200 same as VBAT voltage Check : No R200, PWB.
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RH-59/60 Nokia Customer Care General RF Troubleshooting Two types of measurements are used in the following. It will be specified if the measurement type is "RF" or "LF". • • RF measurements are done with a Spectrum Analyser and a high-frequency 500 ohm passive probe, for example HP54006A. (Note that when measuring with the 500 ohm probe the signal will be around 20 dB attenuated. The values in the following will have these 20 dB subtracted and represent the real value seen on the spectrum analyser).
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RH-59/60 Nokia Customer Care ■ RF key component placement Figure 13:RF key components Table 1: RF component placement N600 Mjoelner RF IC Z601 PCN RX SAW Z602 EGSM RX SAW Z603 EGSM TX SAW B600 26 MHz crystal G600 VCO ( 4.0 GHz UHF VCO ) N700 Power Amplifier (PA) Z700 RX/TX switch 20 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care Refer to the picture below for measuring points at the UEM (D200). Figure 14:Supply points at UEM (D200) Figure 15:Supply point at Mjoelner (N600) ISSUE 1 09/2004 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care RH-60 Receiver Troubleshooting ■ General instructions for GSM850 RX troubleshooting Connect the phone to a PC with the module repair jig. Start Phoenix and establish connection to the phone Phoenix commands RF Controls .Band GSM 850 RX .Continuous mode Channel 190 .AGC 8 FEG ON + 46 dB The setup should now look like this: Figure 16:GSM850 RF controls window ISSUE 1 09/2004 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care Troubleshooting diagram for GSM850 receiver Figure 17:GSM850 receiver troubleshootingt Apply -55dBm 881.6 MHz offset 67.71kHz from generator to antenna conn YES Oscilloscope at RX i/Q signal 588mVpp DC offset 1.35V Freq.67.
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RH-59/60 Nokia Customer Care By measuring with an oscilloscope at RXIP or RXQP on a working GSM 850 receiver this picture should be seen. Signal amplitude peak-peak 789 mV DC offset 1.2 V Figure 18:RX850 I/Q signal waveform ISSUE 1 09/2004 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care ■ General instructions for RH-60 GSM1900 RX troubleshooting Connect the phone to a PC with the module repair jig. Start Phoenix and establish connection to the phone Phoenix commands RF Controls .Band GSM 1900 RX .Continuous mode Channel 661 .AGC 8 FEG ON + 46 dB The setup should now look like this: Figure 19:GSM1900 RF controls 26 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care Troubleshooting diagram for GSM1900 receiver Figure 20:GSM1900 receiver troubleshooting diagram Apply -55dBm 1960.0 MHz offset 67.71kHz from generator to antenna conn YES Oscilloscope at RX i/Q signal 588mVpp DC offset 1.35V Freq.67.
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RH-59/60 Nokia Customer Care By measuring with an oscilloscope at RXIP or RXQP on a working GSM 1900 receiver this picture should be seen. Signal amplitude peak-peak 460 mV DC offset 1.2 V Figure 21: RX1900 I/Q signal waveform 28 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care Measurement points in the receiver Figure 22:RX measurements point at the RX/TX Switch - Z700 Figure 23:Measurements points at the RX-Filters – Z601/Z602 ISSUE 1 09/2004 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care ■ RH-60 transmitter troubleshooting Measurement points for the transmitter Figure 25: TX measurement points in the PA ( N700 ) shielding can Power amp. Figure 26:TX measurement point in Mjolner (N600) shielding can ISSUE 1 09/2004 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care ■ General instructions for RH-60 GSM TX troubleshooting Apply a RF-cable to the RF-connector to allow the 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.
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RH-59/60 Nokia Customer Care GSM850 TX output power Measure the output power of the phone; it should be around 32.1 dBm. Remember the loss in the jig; around 0.3 dB. Figure 28:VPCTRL_G & TXC ISSUE 1 09/2004 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care ■ General instructions for RH-60 GSM1900 TX troubleshooting Apply a RF-cable to the RF-connector to allow the 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. Phoenix commands RF Controls .Band GSM 1900 RX .
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RH-59/60 Nokia Customer Care General Instructions for RH-59 GSM900 RX Troubleshooting Connect the phone to a PC with the module repair jig. Start Phoenix and establish connection to the phone Phoenix commands RF Controls .Band GSM 900 RX .Continuous mode Channel 37. AGC 8 FEG ON + 46 dB The setup should now look like this: Figure 31:GSM900 RF controls window ISSUE 1 09/2004 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care Troubleshooting chart for GSM900 receiver Figure 32:EGSM receiver troubleshooting chart Apply -55dBm 942.4 MHz offset 67.71kHz from generator to antenna conn YES Oscilloscope at RX i/Q signal 588mVpp DC offset 1.35V Freq.67.
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RH-59/60 Nokia Customer Care By measuring with an oscilloscope at RXIP or RXQP on a working GSM 900 receiver this picture should be seen. Signal amplitude peak-peak 789 mV DC offset 1.2 V Figure 33:RX900 I/Q signal waveform ISSUE 1 09/2004 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care ■ 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 Phoenix commands RF Controls .Band GSM 1800 RX .Continuous mode Channel 700 .AGC 8 FEG ON + 46 dB The setup should now look like this: Figure 34:GSM1800 RF control window 40 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care Troubleshooting chart for GSM1800 receiver Figure 35:GSM1800 receiver troubleshooting chart Apply -55dBm 1842.8 MHz offset 67.71kHz from generator to antenna conn YES Oscilloscope at RX i/Q signal 588mVpp DC offset 1.35V Freq.67.
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RH-59/60 Nokia Customer Care XIP or RXQP on a working GSM 1800 receiver this picture should be seen. Signal amplitude peak-peak 460 mV DC offset 1.2 V Figure 36:RX1800 I/Q signal waveform Measurement points in the receiver Figure 37:RX measurements point for the RX/TX Switch - Z700 42 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care Figure 38:Measurements points for the RX-Filters – Z601/Z602 Figure 39:RX I/Q Signals, baseband shielding can UEM (D200) ISSUE 1 09/2004 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care ■ RH-59 Transmitter troubleshooting Measurement points for the transmitter Figure 40: TX measuremnet points for the PA ( N700 ) shielding can Figure 41:TX measurement point for Mjolner (N600) shielding can 44 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RH-59/60 Nokia Customer Care ■ General instructions for RH-59 GSM TX troubleshooting Apply a RF-cable to the RF-connector to allow the 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.
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RH-59/60 Nokia Customer Care ■ PCN Transmitter general instructions for PCN TX troubleshooting Apply a RF-cable to the RF-connector to allow the 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. Phoenix commands RF Controls .Band GSM 1800 RX .Continuous mode Channel 700 .
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RH-59/60 Nokia Customer Care ■ Synthesizer There is only one PLL synthesizer generating Local Oscillator frequencies for both RX and TX in both bands ( PCN and EGSM). The VCO frequency is divided by 2 for PCN operation or by 4 for EGSM operation inside the Mjoelner IC. 26 MHz reference oscillator ( VCXO ) The 26 MHz oscillator is located in the Mjoelner IC (N600). The coarse frequency for this oscillator is set by an external crystal (B600).
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RH-59/60 Nokia Customer Care Phone fails after power on If the phone stops working a short time after the power is turned ON, a possible reason for this could be that the 26MHz system clock signal is not getting to the UPP clock-input in BaseBand. In this case check the following: 1Turn on the phone and check 2VCXO Power supply (C620) = 2.7V 3VCXO output (R425 – end not connected to C425) is 26MHz and approx.