Related Manuals for Nokia NSC/W–1/3 Series
Summary of Contents for Nokia NSC/W–1/3 Series
- Page 1 PAMS Technical Documentation NSC/W–1/3 Series Transceivers Disassembly & Troubleshooting Instructions Original 11/99...
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Page 2: Table Of Contents
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation CONTENTS Page No Disassembly ......... Introduction . -
Page 3: Disassembly
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Disassembly NOTE: Do not attempt antenna removal white the covers are on. The anten- na can be removed only when the phone covers are off Remove battery Remove dust cap by finger nail Remove back cover screws (4pcs phase1, Carefully remove A–cov-... - Page 4 NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Remove UI–module and frame Remove engine module screw (1 pc). Phase 1 version does not have the screw, phase 2 has. Remove engine module To remove antenna : push in snap at antenna base with screwdriver tip while pushing antenna out of B cover.
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Page 5: Introduction
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Introduction RF–measurements must be done using a spectrum analyzer and an high– frequency probe. (Local and reference frequencies and RF power levels in the intermediate stages of the chain) Oscilloscope is used to measure DC– voltages and low frequency signals. -
Page 6: Interface Signals Between Rf And Bb/Dsp
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Interface signals between RF and BB/DSP Signal From Parameter Mini- Typi- Maxi- Unit Function name VBAT Battery Voltage Supply volt- age for RF NOTE! Not char- VREF CCONT PLUSSA Voltage 1.478 1.500 1.523 Reference voltage for... - Page 7 NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions RFCEN CCONT / Voltage 2.85 “1” min 2.0 V PENTA “0” max 0.4 regulator RSSI PLUSSA CCONT Output level Analog mode field sternght indicator TXIP/ COBBA PLUSSA Differential voltage 1.022 1.18 Differential TXIN swing (static) in–phase TX...
- Page 8 NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Logic low ”0” PWR control loop during ramp up/ down TXLX1 Logic high ”1” Low power TDMA level mode for power de- tector Logic low ”0” High power level mode for power detector TXLX2 RF TDMA...
- Page 9 NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions TXWR2 PENTA Logic high ”1” VR12 ON , TDMA1900 TX–mixer enable Logic low ”0” VR12 OFF TXWR3 TDMA800 Logic high ”1” AMPS & TX–mixer TDMA800 TX–mixer enable Logic low ”0” TX–mixer disable CCont Voltage 2.85...
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Page 10: Trouble Shooting
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Trouble Shooting The following hints should facility finding the cause of the problem when the circuitry seems to be faulty. This trouble shooting instruction is divided in fol- lowing section. 1. Phone is totally dead 2. -
Page 11: The Phone Doesn't Register To The Network
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions The phone doesn’t register to the network or phone doesn’t make a call Phone doesn’t register to the network phone doesn’t make a call Check Analog supply voltage VCOBBA is >2.7 V N250 at pin 7,12 ... -
Page 12: Flash Programming Doesn't Work
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Phone is totally dead Failure in VBAT line VBAT is 3.6 V Check X105, X104, Z100 Voltage at pin 29 of CCONT (N150) Faulty circuit N150 is 3.6 V N 150 pin 55 (VBB) 2.8 V(=TP14) CCONT (N150) pin 29 0V when Check R164, X102 PWR switch is pressed or... - Page 13 NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Flash progrmming doesn’t work If the fault information from the prommer is: External RAM fault Check pins of SRAM (D200) Check control lines of SRAM: RAMSelX ... Flash progrmming doesn’t work If the fault information from the prommer is: Algorithm file or alias ID doesn’t find, ID is unknown etc.
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Page 14: Power Doesn't Stay On, Or Phone Is Jammed
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Power doesn’t stay on, or phone is jammed If this kind of fault has come after flash programming, there are most prob- ably open pins in ICs. The soldered joints of ICs: D202 (MAD1), D201 (FLASH), N150 (CCONT), D200 (SRAM) are useful to check first. - Page 15 NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Power doesn’t stay on or phone is jammed software is able to run check UI module CCONT watchdog is served? (pin 50 pulses 1 –> 0) If power is switched off after few seconds, check BSI and BTEM lines connect the shortcircuit fire from N150 pin 29 to ground (watchdog) EEPROM (D203) pin 8 (VBB) 2.8 V...
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Page 16: Display Information: Contact Service
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Display Information: Contact Service This fault means that software is able to run and thus the watchog of CCONT (N150) can be served. Selftest functions are run when power is switched on and software is started to excute from flash. -
Page 17: Audio Failure
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Audio failure Uplink (microphone) and downlink (speaker) are broken Voltage at pin 78 of MAD1 (D202) Check is 2.8 V (without external audio de- R260, R270 vices) HOOK. Voltage at pin 77 of MAD1 (D202) Check is 2.8 V (without external audio de- R268, R265, R260... - Page 18 NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Downlink (speaker) is broken Digital PCM data at pin 50 of Cobba (N250) Check during a call D202 (MAD1) Check DC voltage at pins 28 and 29 of N250 (Cobba) N250 is 1.4 V during a call Check Analog audio signal (some ten millivolts) at pins 28 N250 (Cobba)
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Page 19: Charging Failure
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Charging failure Nothing happens when charger is connected Voltage level at pin 60 of CCONT (N150) Check is higher than 0.4 V when charger is con- X100, R164, R152, nected F150 Check N150 Display Information: Not charging Voltage level at pin 62 of CCONT (N150) Check... -
Page 20: Receiver Fault Amps
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Receiver Fault AMPS General Instructions Start the WINTESLa software and use it to start the needed RX mode of the phone. The troubleshooting flow chart is divided into three steps: – general checking, –... -
Page 21: Receiver Fault Amps
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Receiver Fault AMPS Apply 879.00 MHz –116dBm, 8kHz dev 1 kHz sine signal to external RF–connector X991. Connect EXT HS to audioanalyzator, open AMPS audio RX Chain OK AF: 1 kHz sine signal, meas SINAD AF: >12dB Check UHF Vcnt... - Page 22 NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Note! Check MXR IF level, Check input level F= 116.19 MHz Start synthesizer of front end N701 pin 14 troubleshooting pin 1 f=995.19MHz P:~–22 dBm Change N701 Change N701 Note! Check all components around of N701 Note! Check input of Check all components around of filter,...
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Page 23: Receiver Fault Tdma800
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Receiver Fault TDMA800 Apply 879.00 MHz –50dBm signal to external RF–connector X991. Check RF level of TDMA800 COBBA_D pin no 10 RX–chain OK P: ~–13 dBm Check UHF Vcnt TP31 Start synthesizer V: 2.0...2.5 V troubleshooting Check 3 multiplier... - Page 24 NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Check input level of Check MXR IF level, front end N701, Start synthesizer F= 116.19 MHz pin 1 troubleshooting f=995.19MHz pin 14 P:~–42 dBm Note! Change N701 Note! Check input of IF amplifier Change Z741 Check all components around of filter, V741...
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Page 25: Receiver Fault Tdma1900 (Only For Dualbander)
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Receiver Fault TDMA1900 (only for dualbander) Apply 1960.02 MHz –50dBm signal to external RF–connector X991. Check RF level of TDMA1900 COBBA_D pin no 10 RX–chain is OK P: ~–13 dBm Check UHF Vcnt Start synthesizer TP5U troubleshooting... - Page 26 NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Note! Check input level fo Check MXR IF level, Check all components front end N721, pin 1 Start synthesizer F= 116.19 MHz f=2076.21 MHz around N721 troubleshooting P:~–38 dBm Change N721 Change N721 Note! Check input of Check all components around of filter,...
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Page 27: Transmitter Fault - General
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Transmitter Fault – General Always use a RF–cable connected from an external RF connector to the analyzer via a 10dB attenuator. This is important to protect the analyzer against excessive RF power and to not let unwanted RF power leak in the cellular frequencies. -
Page 28: Transmitter Fault Amps
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Transmitter Fault AMPS AMPS, PWL2, CH383 Note! Check current Check Antenna Circuit consumption: and Duplex filter In Amps mode PA pin 16 bias voltage I: >800 mA should be > 2,2V Check all supply voltages and soldering Check also N900 pin3 frequency and input power. - Page 29 NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Check TXIF Z900 Pin7 f: 161.19 MHz Change N900 P: >–25 dBm upconverter Is Z900 Insertion too Change Z900 high ? I.L : > 5 dB Check modulator Check R906 output N750 pin62 P: max.–18dBm Note! check also I/Q–resistors...
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Page 30: Transmitter Fault Tdma800
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Transmitter Fault TDMA800 The transmitter is the same as in AMPS mode, but the power amplifier is biased to more linear. Consequently it is essential that the AMPS is free of any faults. Start AMPS Is AMPS mode OK ? troubleshooting... -
Page 31: Transmitter Fault Tdma1900
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Transmitter Fault TDMA1900 TDMA1900 and DAMPS modes share a common IF section and antenna cir- cuit. Consequently it is essential that the DAMPS mode is free of any faults. Is TDMA800 mode OK Start TDMA800 troubleshooting Note! - Page 32 NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Check VAPC Check PA input power Change PA V:>2.2 V P:> 0 dBm Check Z951 filter Check TXC insertion loss Change BPF Typ 1.5V@PL2 Max 4 dB Start power control Change N950 troubleshooting Check COBBA Check TX–driver input...
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Page 33: Power Control Loop
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Power Control Loop Power control section is basically similar for both band except both bands include a coupler and detector. The power control is actually effected in the PLUSSA IC. Check V930 and V929 Note ! Check Bias circuit Is V930 voltage drop... -
Page 34: Synthesizers
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Synthesizers There are four oscillators generating the needed frequencies for RF–sec- tion. They are 19.44 MHz reference oscillator, 1GHz UHF VCO frequency range 985.23 ... 1010.2 MHz 2Ghz UHF VCO frequency range 2046.2 ... -
Page 35: 19.44 Mhz Oscillator And 3-Multiplier Troubleshooting
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions 19.44 MHz oscillator and 3–multiplier troubleshooting Note! G850 Check all soldering and supply voltages VCTCXO Change G850 for VCTCXO and RFC–buffer. OUTPUT : Check also coil L850 & capacitor C858. 19.44 MHz P:>0.8Vpp Check AFC–signal from... -
Page 36: Vhf Vco
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation VHF VCO The VHF VCO signal is used to generate the transmitter intermediate fre- quencies. The VHF VCO has two fixed frequencies. The operating frequen- cy is locked in phase locked loop which is controlled by the baseband Because the oscillator employs two frequencies it also has two diferent switching modes. -
Page 37: Vhf Vco Troubleshooting
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions VHF VCO troubleshooting Note! Is oscillator Check BAND–signal status locked ? ”1” = TDMA800&S ”0” = TDMA1900 Check PLUSSA (N401) Check oscillator Start BB pin 54 (SCLK):2.8V output level troubleshooting pin 55 (SDATA):2.8V P:~–20 dBm pin 56 (SENA1):2.8V PLUSSA pin 8... -
Page 38: Amps & Tdma Uhf Synthesizer
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation AMPS & TDMA UHF SYNTHESIZER The 1GHz UHF VCO (G820) generates the first injection for RX (869...897MHz) and the final injection for TX (824...849 MHz) . The output frequency of the module depends on thje DC control voltage supplied by the PLUSSA. -
Page 39: Tdma1900 Uhf Synthesizer 2 Ghz (Dualbander)
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions TDMA1900 UHF Synthesizer 2 GHz (ONLY DUALBANDER) The 2GHz UHF synthesizer generates the needed injection frequencies for TX and RX chain. The output frequency of the VCO depends on the control voltage supplied by the PLL circuit. 2 GHz UHF synthesizer troubleshooting Note! Frequency = 985.23...1010.2... -
Page 40: About Rf Asics And Mmic Pa
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation About RF ASICs and MMIC PA General information The PLUSSA (N750) provides two main functions: RX/TX blocks The receiver block consists of IF buffers, active mixers, 2–multiplier, AGC amplifier and limiter. The transmitter section includes a digital gain step amplifier, a divider , an I/Q Modulator and control part for the Transmitter Power Control loop. - Page 41 NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions VCE2 V5V–signal for UHF charge pump from BB OUTP_rxif Positive output of the receiver output gain stage OUTM_rxif Negative output of the receiver output gain stage LIMOUT2 – Negative output of the limiter amplifier LIMOUT1 –...
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Page 42: Receiver Front Ends
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation Receiver front ends Pin # Pin name Nomi- Description nal lev- LO IN Mixer lo input Vdd buf 2.8V Lo–buffer Vdd LO out Lo–buffer output ground Vdd LNA 2.8V LNA Vdd ground LNA in LNA RF input port LNA ground... -
Page 43: Penta Regulator
NSC/W–1/3 PAMS Technical Documentation Disassembly & Troubleshooting Instructions Pin # Pin name Nomi- Description nal lev- N960 Not connected Not connected Vcc/Q2C VBAT Power supply for the 2nd stage Vcc/Q1C VBAT Power supply for the 1st stage. – Ground RF IN RF input –... -
Page 44: Tdma1900 Upconverter
NSC/W–1/3 PAMS Disassembly & Troubleshooting Instructions Technical Documentation TDMA1900 UPCONVERTER Pin # Pin name Nomi- Description nal lev- VDD1 2.8V Supply voltage Not connected Not connected Ground LO IN TX local input Ground RF OUT RF output VDD2 2.8V Supply voltage Not connected –...