Programmes After Market Services (PAMS) Technical Documentation NHB–3 TROUBLESHOOTING INSTRUCTIONS
PAMS NHB–3 Troubleshooting Technical Documentation AMENDMENT RECORD SHEET Amendment Number Original 26/97 Date Inserted By Comments Page 2
PAMS Technical Documentation NHB–3 Troubleshooting NHB–3 TROUBLESHOOTING INSTRUCTIONS Contents Introduction General Baseband Troubleshooting PWR Button Fault Display Selftest Failed No Registration to the System (no serv) Audio Fault Flash Programming ; part 2 Flash Programming ; part 3 Flash Programming ; part 4 Some BB measurements for reference Power circuitry Repairing Instructions for Flash Faulty Units RF Tuning Fails Calib Temperature Sensor AFC Fails RSSI Fails TXI/TXQ Tuning Power Measuring Power
PAMS Technical Documentation Third Mixer Third IF–filter Z551 Third If amplifier RX Signal levels and frequencies Setting of PCLocals Signal Levels at Front End Signal Levels at IF (1) Signal Levels at IF (2) Signal Levels at IF (3) TX Unit Modulator circuit,TX–part of CRFRT ( N551 ) Upconversion mixer ( V702 ) TX interstage filters ( Z713 and Z727 ) 1st TX–buffer ( V710 ) 2nd TX–buffer ( V725 ) 3rd TX–buffer ( V736 ) Power amplifier Power control circuitry TX signal levels and frequencies Settings of PCLoc
PAMS Technical Documentation Frequency Original 26/97 NHB–3 Troubleshooting 33 Page 5
PAMS Technical Documentation NHB–3 Troubleshooting Introduction General The purpose is to define fault block of the module and then find out the broken component. The trouble shooting diagram has been planned so that the fault, whatever it is, can be found by as simple measurements as possible. The flow diagrams give you the overview of the blocks.
PAMS Technical Documentation NHB–3 Troubleshooting Baseband Troubleshooting The following hints should facilitate finding the cause of the problem when the circuitry seems to be faulty. This troubleshooting guide is divided into the following sections. 1. 2. 3. 4. 5. 6. 7.
PAMS NHB–3 Troubleshooting Technical Documentation PWR Button Fault Phone does’nt start when PWR button is pressed Check X100 NO N271/PSL pin 10 +5 V when VBATT is connected YES NO N271/PSL pins 5,2 VBATT voltage YES Change N271 Change FLEX Check X196 N271/PSL pin 10 +5–>0 V when push PWR button YES R110, C113 OK? Check components around N271 if OK change N271 Original 26/97 Page 8
PAMS NHB–3 Troubleshooting Technical Documentation Display Selftest Failed Display selftest failed or phone doesn’t registrate to the system (tester) Use PCLocals to find out a reason MCU internal test MCU RAM bus test MCU ROM bus test MCU IMEI test YES Unprogrammed FLASH Unconnected pins in MCU address or data lines NO MCU DSP code download: failed, DSP tests: no responce RFI bus fault YES NO MCU audio codec test: failed YES DSP clock oscillator DSP pin 45/INT1 DSP pin 10/ERAMHI DSP pin 9/IOX
PAMS NHB–3 Troubleshooting Technical Documentation No Registration to the System (no serv) No registration to the system (no serv) no call Selftest OK YES DSP pin 43, 45 INT0, 1 (from ASIC) RFI pins 1,63/RXI, RXQ RFI pin 3/EXTBG (4.096 V) RFI pin 4/VCM (2.35 V) RFI pin 6/TXC (to RF) RFI pins 8,9/TXQ+, TXQ– (to RF) RFI pins 11,12/TXI+, TXI– (to RF) RFI pin 14/AFC (to RF) RFI pins 20...
PAMS NHB–3 Troubleshooting Technical Documentation Audio Fault Audio fault Microphone or earphone signal missing Microphone and earphone signal missing? YES CODEC pin 15/SYNC (from ASIC) CODEC pin 16/CODEC_CLK (from ASIC) DSP pins 79, 82/PCMCOSYCLKX (from ASIC) DSP pins 60, 81/PCMDATRCLKX (from ASIC) DSP pin 80/CODEC_CLK NO Microphone signal missing? YES CODEC N260/pins 22, 23 MICP, MICN X196/pins 18, 19 MICP, MICN CODEC N260/pin 10 PCMOUT CODEC N260/pin 17 MICENA X196/pin 12 MICENA NO Earphone
PAMS NHB–3 Troubleshooting Technical Documentation FLASH programming MBUS registration OK? YES NO Display: selftest failed D231/MCU/pin 3; _RD D230/ASIC/pin 97; RSTROBE YES NO 3 Power stays on? YES Display: selftest failed NO NO Check X100 NO Short circuits in data lines.
PAMS NHB–3 Troubleshooting Technical Documentation Flash Programming ; part 2 2 NO YES Change D230 MCU/D231/pin 10 RESETX +5 V after power on? 26 MHz clock D230/pin 119? NO 26 MHz/1 Vpp in testpoint J113 YES Check components D191, D192, R231 R246, R247, C234 YES 26 MHz at MCU /D230 pin 69 /MCUCLK? NO Change D230 YES MCU/D230 /pin 8/MD2, MCU/D230 /pin 9/_STBY NO Check joints and foils YES MCU/D231/pin 43 /XPWROFF pulses up to +5 V after pwr on? NO Change D231 YES MCU/D231/pin 77 /IRQ0 +5
PAMS NHB–3 Troubleshooting Technical Documentation Flash Programming ; part 3 3 EEPROM initialization OK? YES 4 NO NO Check D230 D184/EEPROM /pin 27/EROMSELX pulses +5 to 0 V during r/w action? YES Check D231 (D230) NO D184/EEPROM /pin 1/RSTROBEX pulses +5 to 0 V during r/w action? YES Check D231 (D230) NO D184/EEPROM /pin 1/WSTROBEX pulses +5 to 0 V during r/w action? YES Change D184 Original 26/97 Page 14
PAMS NHB–3 Troubleshooting Technical Documentation Flash Programming ; part 4 4 D185/FLASH /pin 11 +12 V during programming? NO Check X100/pin 14 C182, R175, R169, L180 NO Check X100/pin 6 R177, R178, C176 NO Check D231/pin63 R184, R185, C186 YES D231/MCU /pin 64/HOOK/RXD2 pulses during prog? YES X100/pin 7 /PHFS/TXD2 pulses during programming? YES D185/FLASH /pin 12/PWD +5 V after power on? NO Check D230 YES D185/FLASH /pin 9/ROMSELX pulses from +5 to 0 V after power on? NO Check D231 (D230
PAMS NHB–3 Troubleshooting Technical Documentation Some BB measurements for reference Test point 1 N271 : 5, 20 2 N271 : 2 / 24 / 1 Frequency / DAC Level Note VBatt 4.6 V VA1 / VA2 / Vref 3 L272 4.6 V VL 1 3 L273 4.6 V VL 2 9 R279 6 D200 : 37, 38 60.2 MHz 11 D200 : 40 30 MHz 7 D200 : 39 8 D200 : 43, 45 5 D231 : 69 12 4.6 V DSPCLKEN > 400 mVpp DSPCLK CKO 4.6 V DSPIRSTX ~ 0V INT0, INT1 ~ 5 Vpp MCUCLK D231 : 10 4.6 V RESETX 13 D231 : 77 4.
PAMS NHB–3 Troubleshooting Technical Documentation Power circuitry VCTCXO CLK 26 MHz D192 BUFFER CLK 26 MHz VBAT 5.5...8 V VL1 5,20 CHRGDET 1.5 V DETIN 11 VL2 PSL 12 1 2 C113 14 ON 116 24 8 VREF ASIC 45 99 VA MCU CLK RESET 69 10 IRQX 5 V=ON 5,42 VA2 XRESET MCU 77 66 TXD R166 46 XPWROFF 9 43 XPWROFF 2 pulses / sec PSL – Output voltages must be stay at high state at least 1.5 s when power is switched on. – If no; check C113. – If it is OK; replace PSL.
PAMS Technical Documentation NHB–3 Troubleshooting Repairing Instructions for Flash Faulty Units 1. When the phone doesn’t start (power off after 2 seconds) check following things: – VBATT is connected to the PSL N271 – XRES rise to high state – VL1 is 4.
PAMS Technical Documentation NHB–3 Troubleshooting 4. If selftest (A) is failed, check: – Solderings of EEPROM D184 – Do factory set once again (setup error in EEPROM D184) 5. If selftest (B) is failed, check: – Measure by oscilloscope that crystal XT1 is running (60.2 MHz). – Reset signal DSP1RSTX for DSP (D200 pin 39) is high state. – Small clock signal at pins 37, 38 of DSP is greater than 400 mVPP. – Clock signal at pin 40 (DSP) is 30 MHz (square wave; amplitude 5 V).
PAMS Technical Documentation NHB–3 Troubleshooting TXI/TXQ Tuning Carrier leagage must be tuned with shields and edge clip on and screws tighten. Upper side bands amplitude is not allowed to tune to its minimum with amplitude and phase tuning. Because if the data type is changed to another then the USP signal will be higher => TUNE TO BALANCE. If there is no signal at N551 pins 21...24, check N270 solders.
PAMS Technical Documentation NHB–3 Troubleshooting Repairing instructions for RF unit Common features NHB–3 receiver’s frequency band is 60 MHz. It starts at 1930,2 MHz and ends at 1989,8 MHz. This band consists 299 channels from 512 to 810. Receiver dynamic range is 96 dB that is composed of 39 dB gainstep in front–end and 57 dB gainstep in AGC–amplifier in CRFRT–circuit. The frequency band of NHB–3 transmitter is 60 MHz between 1850.2 and 1909.8 MHz.
PAMS Technical Documentation NHB–3 Troubleshooting NHB–3 Receiver Functional Description Measurements should be done using spectrum analyzer with high–frequency probe (LO–/reference frequencies and RF –levels) and oscilloscope (DC–voltages and the amplitude of the reference oscillator). Front–end amplifier V501 The front–end amplifier operates with 5,5 mA current. Base and collector voltages are Vb=0,86V and Vc=3,44V. Front–end gain is controlled by signal PDATA0 which comes from RFI–circuit.
PAMS Technical Documentation NHB–3 Troubleshooting IF–filter First IF–filter is made to reject the mirror frequencies of second IF (487MHz). Second Mixer V531 Second mixer converts 313 MHz first IF to 87 MHz second IF. Conversion loss is about 6 dB. Local signal is driven in to mixer at level of 3 dBm and the frequency is 400 MHz. Second Local Buffer V532 Buffer is running at 6,5mA current and base and collector voltages are Vb=0,7V and Vc=2,2V. Buffer has about 10 dB gain.
PAMS NHB–3 Troubleshooting Technical Documentation Third If amplifier Third IF–amplifier is located in CRFRT and it’s a constant gain amplifier with 30dB gain. Signal is brought out with two pins that have different phase shifters after the CRFRT–circuit. With these phase shifter 90 degree’s phase difference is accomplished. After the phase shifters signals are fed into the IQ–demodulator that is in RFI–circuit which is located in baseband area.
PAMS NHB–3 Troubleshooting Technical Documentation Signal Levels at IF (2) Bias 7 Bias 8 6 7 Bias 9 Bias 10 8 9 Test point Position Frequency *Level Note: V532 B V532 C V532 B V532 C V541 B V541 C V541 B V541 C DC DC 400 MHz 400 MHz DC DC 87 MHz 87 MHz 0.71V 2.19V –11.3 dBm +9.5 dBm 1.81V 4.24V –46.6 dBm –26.0 dBm Test point Position Frequency *Level RXI RXQ 12.932 MHz 12.932 MHz –3.7 dBm –3.
PAMS Technical Documentation NHB–3 Troubleshooting TX Unit Measurements should be done using spectrum analyzer with high–frequency probe (LO–/reference frequencies and RF –levels) and oscilloscope (DC–voltages and the amplitude of the reference oscillator). Modulator circuit,TX–part of CRFRT ( N551 ) The modulator is a quadrature modulator contained in TX–section of CRFRT IC. I– and Q–inputs generated by RFI interface are DC–coupled and fed via buffers to the modulator.
PAMS Technical Documentation NHB–3 Troubleshooting 2nd TX–buffer ( V725 ) Bipolar transistor amplifier which amplifies the TX–signal coming from 1st interstage filter. Ic=15mA,Vb=0.85V,Vc=3.0V and gain is about 14dB. Supply voltage is 4.5V. 3rd TX–buffer ( V736 ) 3rd buffer is bipolar transistor amplifier. It amplifies the TX–signal coming from 2nd interstage filter. Ic= 40 mA,Vb=0.84V, Vc=3.0V and gain is about 13 dB. Supply voltage is 4.5V.
PAMS NHB–3 Troubleshooting Technical Documentation TX signal levels and frequencies Levels are measured with HP high frequency probe 50Ω 10:1. Supply voltage 6.0V was connected via dummy battery ( type BTS–4 ). PClocals was used to control the phone. The probe was connected to spectrum analyzer.
PAMS NHB–3 Troubleshooting Technical Documentation Signal levels of 3rd amplifier Test point Position Bias 7 Bias 8 6 7 V736 base V736 collector Z727 out V736 collector Frequency *Level Note: 1880 MHz 1880 MHz 0.84V 3.0V –2 dBm 11 dBm Bias Bias TX–signal TX–signal Frequency *Level Note: 1880 MHz 1880 MHz –3.
PAMS Technical Documentation NHB–3 Troubleshooting Synthesizer Measurements should be done using spectrum analyzer with high–frequency probe (LO–/reference frequencies and RF –levels) and oscilloscope (DC–voltages and the amplitude of the reference oscillator). Brief describtion of the synthesizer Reference oscillator The reference oscillator is a discrete VCTCXO consisting of a 26 MHz crystal, BJT(V801) –oscillator circuit and buffer(V802).
PAMS NHB–3 Troubleshooting Technical Documentation Synthesizer Signal levels and frequencies UHF Synthesizer Malfunction Setting of PCLocals Active unit : Operation mode : Continuous Mode Ch: RX or TX Continuous (RX) or Burst (TX) Channel will be changing Synthesizer locked ( Control voltage depends on channel) Test point Position 1 1 1 Frequency C821 C821 C821 *Level Note: ~1.5V ~2.0V ~2.
PAMS NHB–3 Troubleshooting Technical Documentation Reference oscillator VCTCXO 6 7 Bias Bias Bias Test point Position Frequency *Level Note: V800 N820 pin 8 V801 C V801 B V801 E DC 26MHz DC DC DC ~2.5V 1Vpp 3.2V 1.8V 1.1V fref Bias Bias Bias – check the crystal and other components in oscillator circuit. VHF Synthesizer Malfunction Voltage from Do IF 8 Test point Position Frequency *Level Note: C823 DC 2.
PAMS NHB–3 Troubleshooting Technical Documentation Frequency Test point Position Frequency C850 (VHFLO) 400 MHz *Level Note: (all channels).
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