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Nokia NSD-1 SERIES, Disassembly & Troubleshooting Instructions

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Nokia NSD-1 SERIES Disassembly & Troubleshooting Instructions Download Page 10

NSD–1
Disassembly / Troubleshooting Instructions

PAMS Technical Documentation

Page  10

Issue 2  09/00

 Nokia Mobile Phones Ltd.

ously variable analog signal must be used. Since the DSP outputs only
digital signals, a PDM RC circuit is used to convert the digital output sig-
nal to an average analog voltage. A PDM line will always have a series
resistor followed by a shunt capacitor. The output of the MAD4 PDM lines
will appear as squarewave signals. However, after the shunt capacitor the
signals will appear to be DC with perhaps a slight ripple. The RC circuit
acts as an integrator in order to yield the average value (DC) of the
squarewave signal.

The transmit data bus (TXD(7:0)) is 8 bits wide. In CDMA this bus is mul-
tiplexed between sending I and Q data. The signals required to transfer
TX data are TXGATE, CLK9M80, and IQSEL. TXGATE must be high to
transfer data, and the data is clocked by CLK9M80, which is running at
9.8MHz. In AMPS mode, CLK9M80 is running at 120kHz, therefore, data
is being transferred from MAD4 to CAFE at 120kHz.

The JTAG lines are intended to be used to operate the DSP (and/or
MCU) externally.

External Regulator

A separate 2.8V external regulator was added to power the Lead (DSP)
independently due to noise on VBB. Eventually, the next version of MAD4
will be used and the Lead may be powered by VMAD from CCONT. See
External Regulators section under CCONT/Linear Regulators. Note: This
regulator is also mentioned in section Power Circuitry.

MCU

The MCU is used to perform functions that require less processing power
than the DSP. It runs UI software, mode control, interfaces to MBUS,
downloads code to flash, reads and writes the EEPROM, controls charg-
ing, and interprets A/D data from CCONT.

Memories

MAD4 interfaces to three memories—Flash, SRAM, and EEPROM.  All of
them are powered by 2.8V (Vbb). During Flash programming, Vpp (signal
name is Vff on schematic) is driven with 12V in the factory, and 3V at the
PC flash stations.

Failures

Most of the failures will be due to SMD errors. Either solder got where it
wasn’t supposed to be, parts slid off their pads, or possibly the parts were
placed incorrectly. A good visual inspection will uncover a large percent-
age of failing phones.

Won’t power up

Do a visual inspection. Verify that all parts are on the board correctly, and
that none are missing.

Check that the 32kHz clock turns on when attempting to power up.

Check the power circuitry. This includes VBAT, Vref, and all of the linear
regulators, as well as the Penta regulators. Verify also that the external
regulator that powers MAD4 (LEADVCC) is functional.

Summary of Contents for NSD-1 SERIES

Page 1: ...PAMS Technical Documentation NSD 1 Series Transceivers Issue 2 09 00 Nokia Mobile Phones Ltd Disassembly Troubleshooting Instructions ...

Page 2: ...10 Flash Align 11 In the field 11 RF Troubleshooting 15 WinTesla General Set Up 15 Testing Menu 17 AMPS Fault Finding Setup 17 Cell Band CDMA Fault Finding Setup 18 PCS Band CDMA Fault Finding Setup 19 Tuning Menu 19 AMPS Tuning AFC 19 AMPS Tuning Tx Power Levels 21 AMPS Tuning Tx Modulation Index 24 AMPS Tuning RSSI 25 AMPS Tuning Rx Audio Gain 27 800 CDMA Tuning Tx IF AGC 28 800 CDMA Tuning LNA ...

Page 3: ...Phones Ltd NOTE When assembling the B cover screws use 17 Ncm torque NOTE Do not attempt to remove the antenna from the B cover 1 2 3 4 5 Remove battery Remove dust cap by fingernail Remove back cover screws 4 pcs Remove C cover Carefully remove A cover Note snap fixings Press strongly towards arrow direction 6 ...

Page 4: ...chnical Documentation Page 4 Issue 2 09 00 Nokia Mobile Phones Ltd NOTE When assem bling the screw use 17 Ncm torque 7 8 Remove UI module screws 2 pcs Remove UI module and frame Remove engine module screw 1 pc Remove microphone Remove engine module 9 10 11 ...

Page 5: ...ower management ASIC It s features include eight 2 8V linear regulators a linear regulator with adjustable output a refer ence voltage output a 5V switch mode regulator an 8 channel A D con verter and 32kHz clock circuitry Each of the main functions and signals are described below including information on how to verify correct opera tion Vbat CCONT is powered directly from the battery voltage Vbat...

Page 6: ...om 1 3V to 2 65V in 0 225V steps and is used with MAD4 ver 3 but not MAD4 ver 2 The output at V2V when MAD4 ver 3 is stuffed should be 1 750V 5 and can be checked on TP2 Switch mode regulator 1 V5V 5V_POWER V5V is a 5V switch mode regulator which always remains on during CCONT power on mode Valid voltages are 4 8V to 5 2V and it can be checked at TP13 2 VSIM 3V_5V VSIM is powered by the same switc...

Page 7: ...wing CCONT will turn on when the power key is pressed verify this by check ing Vbb but will then power off after 32 seconds All three serial bus sig nals CCONTCSX UIF_CCONT_SDIO and UIF_CCONT_SCLK should toggle when attempting to write to a CCONT register Note If the LCD does not come on during this time however it may indi cate that the serial bus is functional but phone does not have valid flash...

Page 8: ...A clock The CDMA clock is 9 8MHz and is generated in CAFE with a PLL This should be a 2 8V square wave and can be verified at TP21 Charging Circuit The charging switch CHAPS is controlled by a PWM from CCCONT This PWM can be at 1Hz or at 32Hz with varying duty cycles and should only be active when a charger is detected The frequency should be 1Hz when an ACP 7 is detected and 32Hz when an ACP 9 is...

Page 9: ...n pin 19 TP21 See also Clocks section AMPSMOD AMPSMOD is the voice signal to modulate FM the RF carrier for trans mission It is the voice signal that has been processed by the DSP MAD4 for transmission in AMPS mode It represents a modified version of the signal produced by the microphone CAFÉ pin 58 Transmit and Receive RF Signals In CDMA mode receive I and Q channel RF signals RXIQ 3 0 come into ...

Page 10: ...wer the Lead DSP independently due to noise on VBB Eventually the next version of MAD4 will be used and the Lead may be powered by VMAD from CCONT See External Regulators section under CCONT Linear Regulators Note This regulator is also mentioned in section Power Circuitry MCU The MCU is used to perform functions that require less processing power than the DSP It runs UI software mode control inte...

Page 11: ...possible short between two or more of the address or data lines In the field Solder joints may be adequate for passing manufacturing requirements however they may not hold up to mechanical stress or heat cycling Cracked or broken solder may cause failures to occur from simple use Reflowing some of the major components may fix problems where the phone exhibits strange behavior some buttons may not ...

Page 12: ...33 ResetX 0 2 8 V active low From MAD4 to CAFE 30 Vbat 3 1 4 1 V valid battery range 3 1 5 2 with charger connected From Battery connector to CCONT and other various parts of phone 3 Vbb 2 8 V typical 2 7 2 87 V From CCONT to MAD4 and Memories 2 Vmad N A From CCONT to MAD4 11 Vr1 2 8 V typical 2 67 2 85 V From CCONT to 19 2MHz VCTCXO 12 Vr1_Sw MIC bias 0 2 75V From CCONT to V201 to CAFE 40 Vr2 0 2...

Page 13: ...Bi directional Serial bus to MAD4 and the Bottom Con nector 54 Fbus_Rx 0 2 8 V Serial bus from Bottom Connector to MAD4 55 Fbus_Tx 0 2 8 V Serial bus from MAD4 to the Bottom Connector 56 L_Gnd 0V From Bottom Connector through an inductor to Phone Ground 37 BTEMP Variable DC From Battery terminal to CCONT 42 VCHAR Vin divided by 10 From System connector to CHAPS and CCONT 8 PA_Temp Variable DC From...

Page 14: ...NSD 1 Disassembly Troubleshooting Instructions PAMS Technical Documentation Page 14 Issue 2 09 00 Nokia Mobile Phones Ltd ...

Page 15: ...eeprom Tuning is described in four parts A description of the tuning Describes the tuning process Definition of result What tuning is storing to eeprom Manual Verification How to use WinTesla to tune the phone Trouble Shooting Outlines key components to be checked WinTesla General Set Up Connect the phone to the PC COM port and start WinTesla Select Prod uct and New and the phone configuration wil...

Page 16: ...NSD 1 Disassembly Troubleshooting Instructions PAMS Technical Documentation Page 16 Issue 2 09 00 Nokia Mobile Phones Ltd ...

Page 17: ...inding Setup For all AMPS transmitter and receiver testing and trouble shooting select Testing and then AMPS Baseband Tuning This automatically sets the receiver on and the transmitter on Channel 380 Power level 3 The transmitter power level can be set by selecting the Power Level The TX_LIM_ADJ and other PDMs can be adjusted by selecting PDM Ctrl ...

Page 18: ...rom the same selection of Testing and CDMA Entering this screen switches on both the transmit ter and receiver on Channel 364 For PCS simply click the PCS box The PDMs can be adjusted with the slider or by entering a value The trans mitter is switched off by clicking the Tx Off Box The RX_IF_AGC is read by clicking the Read button The LNA defaults to ON and OFF can be switch by ticking the LNA box...

Page 19: ... 2 MHz using a DC voltage TP100 controlled by the AFC PDM The resulting PDM is stored to ee prom The unmodulated AMPS transmitter is set on Channel The output carrier is monitored with a spectrum analyzer Click on WinTesla Help for equipment set up The AFC PDM is tuned until the RF carrier frequency is within 250Hz of 841 5MHz i e Channel 550 The AFC must be tuned if the VCTCXO is replaced On SSP ...

Page 20: ...0 in the base band section and by R504 and C507 in the RF section Resistors R503 and R538 center the PDM voltage Typically a correctly tuned VCTCXO should have approximately 2 volts on pin 1 TP100 Adjustment of the AFC PDM from 0 to 511 should result in a voltage change on G501 Pin 1 TP100 between 1 9 and 2 2 volts with a 10KHz change in the transmitter output frequency in Cel or a 22KHz change in...

Page 21: ...s done with the phone in AMPS mode with transmitter on and the TX_RF_AGC PDM set to FF and TX_IF_AGC set to 1FF NOTE The AMPS Transmitter band is frequency compensated with fixed values these are referenced to the channel with the lowest loss which is Channel 550 It is very important to tune the transmitter using Channel 550 otherwise the maximum allowable power may be exceeded Definition of Resul...

Page 22: ...2 dBm 0 5 dB 7 8 dBm 1 dB Trouble Shooting If only the top PL2 or PL3 power levels fail then the transmitter is slightly short of gain This could be caused by many transmitter faults Check the PA N605 output Pins 11 12 13 14 TP104 are not shorted to ground Note This should be done with the phone switched off If these pins TP104 are shorted the PA must be replaced and it is likely that inductor L61...

Page 23: ...Instructions PAMS Technical Documentation Page 23 Issue 2 09 00 Nokia Mobile Phones Ltd Tx VHF LO Measured at TIF N604 Pin 3 TP105 with a Hi Z Probe UHF Cel LO measured at Odyssey N703 Pin 2 TP106 with Hi Z probe when set to Channel 384 ...

Page 24: ...e correct peak deviation of the RF Click the WinTesla Help button for equipment set up Definition of Result The result is the DSP Gain which gives 2KHz 0 05KHz peak deviation at the RF output This DSP Gain is stored to eeprom Manual Verification Use WinTesla as follows Trouble Shooting Check the following components in the Tx VHF VCO to see if they are damaged V501 V504 V508 V511 and L504 NOTE If ...

Page 25: ...For RSSI Lo the result should be between 570 and 970 and is stored to eeprom under the han dle RF_TUNE_AMPS_RSSI_LO_HANDLE For RSSI Hi result should be between 750 and 1050 and is stored to eeprom under the handle RF_TUNE_AMPS_RSSI_HI_HANDLE Manual Verification Use WinTesla as follows Trouble Shooting Check components in the AMPS receiver chain starting with the Duplexer Z701 Down Converter IC N70...

Page 26: ...NSD 1 Disassembly Troubleshooting Instructions PAMS Technical Documentation Page 26 Issue 2 09 00 Nokia Mobile Phones Ltd LIM_P Measured at RIF Pin 17 TP108 with a 10 Mohm probe ...

Page 27: ... Description of Test This test tunes the DSP Gain so that an RF input signal with 2 9KHz devi ation and 1KHz modulation results in a voltage at the receiver output of 57 4 3 mV RMS The DSP Gain is then stored to eeprom Definition of Result The stored eeprom value will result in 57 4mV RMS at XEAR when using JBA4 and receiving an RF signal with 1KHz tone and 2 9KHz deviation Manual Verification Use...

Page 28: ...ents for both Transmitter and Receiver Offset and slope values are stored in eeprom for each of these 16 segments The offset for the segments is computed from the 3 point calibration per formed in this test After test a 2nd order approximation is made and the Offset and Slope computed TX_IF_AGC must be adjusted to achieve the correct power level for Point 1 when this is done the process must be re...

Page 29: ...tput Pins 11 12 13 14 TP104 are not shorted to ground Note this should be done with the phone switched off If these pins are shorted the PA must be replaced and it is likely that inductor L618 will have burnt out Also check that the Tx VHF LO TP105 and UHF LO TP106 are present at the correct frequency and level see the AMPS Tuning Tx Power Levels section NOTE If any of these components are damaged...

Page 30: ...F_AGC is adjusted by the phones software to make the best use of the CAFÉ ADC The setting of RX_IF_AGC is then read from the phone The LNA is switched from High Gain mode to Low Gain Mode The RX_IF_AGC is allowed to readjust itself to again make the best use of the CAFÉ ADC and the RX_IF_AGC is read a second time The result is the Gain delta between High Gain and Low Gain modes Definition of Resul...

Page 31: ... split into 16 segments for both Transmitter and Receiver Offset and slope values are stored in eeprom for each of these 16 segments The offset for the segments are computed from the 3 point calibration per formed in this test After test a 2nd order approximation is made and the Offset and Slope are computed This tuning is done by putting signal level 1 into the receiver the RX_IF_AGC will then au...

Page 32: ...sted NOTE If any of these components are damaged and are replaced then the Rx IF AGC second order curve must be retuned 800 CDMA Tuning Rx IF Compensation Description of Test In this tuning the receiver is calibrated at five different frequencies across the band WinTesla instructs the Signal Generator to be set at five specific frequencies and a fixed amplitude The RX_IF_AGC is adjusted by the pho...

Page 33: ...both Transmitter and Receiver Offset and slope values are stored in eeprom for each of these 16 segments The offset for the segments are computed from the 3 point calibration per formed in this test then a 2nd order approximation is made and the Offset and Slope computed TX_IF_AGC must be adjusted to achieve the correct power level for Point 1 when this is done the process must be repeated for Poi...

Page 34: ...nt out and has open cir cuit Check the switch to the split band filter N609 and it s control transis tor V614 and control line FILT_SEL TP114 Check also the Up Convert er N601 and also TIF N604 Also check that the Tx VHF LO TP105 and UHF LO TP115 are present at the correct frequency and level NOTE If any of these components are damaged and are replaced then the Tx IF AGC must be retuned 1900 CDMA ...

Page 35: ...ference to the previously computed 3 point curve fit This delta should be between 21 and 30dB It is stored to eeprom handle RF_TUNE_RX_GS_HANDLE Manual Verification Use WinTesla as follows Trouble Shooting In the PCS band the RX_GS input to the up converter N01 is NOT used Instead the external LNA is switched on and off with Penta N303 Pin 9 output P5 TP116 Check that the external LNA is being swi...

Page 36: ...e offset for the segments are computed from the 3 point calibration per formed in this test then a 2nd order approximation is made and the Offset and Slope computed This tuning is done by putting signal level 1 into the receiver the RX_IF_AGC will then automatically adjust for max CAFÉ input and the RX_IF_AGC is noted This process is then repeated for signal levels 2 and 3 Definition of Result The...

Page 37: ... are replaced then the Rx IF AGC must be retuned 1900 CDMA Tuning Rx IF Compensation Description of Test In this tuning the receiver is calibrated at six different frequencies across the band WinTesla instructs the Signal Generator to be set at six specific frequencies and a fixed amplitude The RX_IF_AGC is adjusted by the phones software to make the best use of the CAFÉ ADC The setting of RX_IF_A...

Page 38: ...Odyssey up con verter IC LO from 1 GHz VCO to Odys sey up converter IC 107 Rx VHF LO 256 2 MHz VHF LO to RIF LO from PLL to RIF 108 LIM_P 450 KHz signal from RIF RIF 450 KHz output to CAFÉ 109 RSSI dc voltage indicating signal level into receiver RIF output to CCONT Pin A1 A to D converter 110 LIM_P 450 KHz signal into CAFÉ RIF 450 KHz output to CAFÉ 111 RX_GS 0v or 2 7v for LNA OFF or ON Voyager ...

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