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Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions 7DEOH RI &RQWHQWV 3DJH 1R RF Troubleshooting ....................................................................................................... 4 Introduction to RF troubleshooting .............................................................................4 RF Key component placement .....................................................................................5 RF Measurement points ......................
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Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions 7UDQVPLWWHU WURXEOHVKRRWLQJ GLDJUDP )LJXUH 7UDQVPLWWHU WURXEOHVKRRWLQJ Transmitter troubleshooting diagram TX troubleshooting TX OK Yes Check output signal level: +32...+33dBm @897.4 MHz (GSM900) Yes +29...+30dBm @1747.
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation )LJXUH +(/*$ ,& WURXEOHVKRRWLQJ HELGA troubleshooting Check with oscilloscope: -TXI/TXQ signals -VR1, VR2, VR4, VR5, VR6 = 2.8V -VrefRF01 = 1.35 V -HELGA serial interface -TXP & TXC signals OK ? Check with RF probe: -4G VCO out signal - 3589.6 MHz (GSM900) -3495.
Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions )LJXUH 3$ DQG $QWHQQD 6ZLWFK WURXEOHVKRRWLQJ PA & ant switch troubleshooting Yes *(When 1kOhm passive probe is used, correct the measurement by +26dB Check with RF probe signal level on PA input >=0dBm (* OK ? Yes Yes Check with oscilloscope: -VANT_1 (GSM900) -VANT_2 (GSM1800) -VANT_3 (GSM1900) Replace ant. switch OK ? No Check with oscilloscope: -VBATT ~4V - VTXB = 2.
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation 3LFWXUHV RI WUDQVPLWWHU VLJQDOV )LJXUH 7UDQVPLWWHU VLJQDOV 7;, 93& 200mV/div 100us/div 200mV/div 1 VPCTRL _900 power level high at R703/C703 VPCTRL_1800/1900 power level high at R704/C704B 100us/div TX I/Q at R516/517 power level high Random data 1 500mV/div 500mV/div 100us/div VANT_1 / GSM900 TX at C804 VANT_2 / GSM1800 TX at R808 VANT_3 / GSM1900 TX at C805 OV ( no signal/ Flatline on Oscilloscope scree
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NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation 7URXEOHVKRRWLQJ GLDJUDP IRU *60 UHFHLYHU 3KRQH LQ ¦&RQWLQXRXV§ PRGH $*& VHWWLQJ ¦ § )LJXUH *60 UHFHLYHU WURXEOHVKRRWLQJ Apply –90dBm 942.46771MHz signal from generator to antenna connector Yes Oscilloscope at RX_I Signal 700mVpp DC offset 1.35V*** Frequency 67.
Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions 7URXEOHVKRRWLQJ GLDJUDP IRU *60 UHFHLYHU 3KRQH LQ ¦&RQWLQXRXV§ PRGH $*& VHWWLQJ ¦ )LJXUH *60 UHFHLYHU WURXEOHVKRRWLQJ Apply –90dBm 1842.86771MHz signal from generator to antenna connector Yes Oscilloscope at RX_I Signal 140mVpp DC offset 1.35V *** Frequency 67.
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation 7URXEOHVKRRWLQJ GLDJUDP IRU *60 UHFHLYHU 3KRQH LQ ¦&RQWLQXRXV§ PRGH $*& VHWWLQJ ¦ )LJXUH *60 UHFHLYHU WURXEOHVKRRWLQJ Apply –90dBm 1842.86771MHz signal from generator to antenna connector Yes No Oscilloscope at RX_I /RXQ Signal 160mVpp DC offset 1.35V *** Frequency 67.
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NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation 6\QWKHVL]HU WURXEOHVKRRWLQJ GLDJUDP )LJXUH Synthesizer troubleshooting Yes *(When 2.5kOhm passive probe is used, correct the measurement by +34 dB Set with RF controls: Active Unti = Rx Operation mode = Continuous Yes Synthesizer OK Check with RF probe: -4G VCO out signal - 3589.6 MHz (GSM900) -3495.
Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions 3LFWXUHV RI V\QWKHVL]HU VLJQDOV Figure 15: 26MHz at G501 pin out Figure 16: 26MHz RFCLK at R420/C420 Figure 17: 1800 TX, channel 512, burst mode ,VVXH 1RNLD &RUSRUDWLRQ 3DJH
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation Figure 18: 1900 RX, channel 810, continuous mode )LJXUH 9&2 RXWSXW EDQG 5; RQ FRQWLQXRXV RXWSXW REF 4. 0 dBm 10dB/ W ed Aug 21 21:23:21 2002 ATT 10 dB A_vi ewB_blank MARKER 3. 685604 GHz - 3. 97 dBm SPAN 1. 000 MHz REF OFS 34.0 dB RBW 10 kHz VBW 10 kHz SWP 50 ms 3DJH CENTER 3. 685600 GHz 1RNLD &RUSRUDWLRQ SPAN 1.
Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions %DVHEDQG WURXEOHVKRRWLQJ 7KH IROORZLQJ GLDJUDPV GHVFULEH EDVHEDQG WURXEOHVKRRWLQJ 0DLQ 7URXEOHVKRRWLQJ 'LDJUDP )LJXUH %DVHEDQG JHQHUDO WURXEOHVKRRWLQJ Start Phone totally dead Yes Phone is dead Yes Flash faults Yes Phone is jammed Yes Charger fault Yes SIM card fault Yes Audio faults Yes Keypad faults Yes Display faults Yes Accessory faults Yes Illuminationy faults No Flash programming does
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation 3KRQH LV GHDG )LJXUH 'HDG SKRQH WURXEOHVKRRWLQJ Start Is phone current 0 mA? Yes Check X100 (contacts, solderings). Is it OK? No Change X100 No Change defect ones Yes Check L260 L265 and C260 C265.
Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions )ODVK 3URJUDPPLQJ )DXOW )LJXUH )ODVK SURJUDPPLQJ WURXEOHVKRRWLQJ Start Is the FBUS TX-line HIGH after startup? Measure BSI-pulse during Flash operation. Is it OK? No No Check BSI-line including X100,C100,C240,R202 and R206. Yes Yes Measure FBUSTX-line during Flash operation (J411). Is it ~1.8V?. Yes Is FBUSTX-line set to LOW after it has been HIGH? No Check R104.
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation 3KRQH LV MDPPHG )LJXUH -DPPHG SKRQH WURXEOHVKRRWLQJ Start Measure VIO, VCORE, VFLASH1,VANA, VR3 voltages. Are they OK? No No Measure Sleep Clk from B200. Is it OK? Yes Measure 26MHz RFClk from R420. Is it OK? No Check BSI/BTEMP-lines. If OK, UEM regulators are not working. Change UEM. No Check B200, C209 and C210 Yes Change UEM Measure 26MHZ RFClk from G501.
Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions 6,0 FDUG IDXOW ,QVHUW 6,0 &DUG UHMHFWHG )LJXUH 6,0 FDUG WURXEOHVKRRWLQJ Start Insert SIMor Card rejected fault? Yes No Check BSI-line including X100,C100,C240,R202 and R206. If OK, change UEM. No Check VSIM-line (X386,C390,R386,C203). If OK, change R388. If still fail, change UEM. No Check SIM lines (X386). If OK, change R388. If still fail, change UEM. Set phone to LOCAL mode.
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation .H\SDG )DXOW )LJXUH .H\SDG WURXEOHVKRRWLQJ Start Is the power key working? No Measure voltage from S302. Is it HIGH? No Check R306,C310,S30 2 and line. If OK, change UEM Yes Measure voltage from S302 when Yes pressed. Is it HIGH? Yes Check S302. Is it OK? Yes Phone is dead No No Change S302 Phone is jammed Is the volume UP key working? No Measure ROW0 line from S300. Is it ~1.
Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions )LJXUH .H\SDG WURXEOHVKRRWLQJ Continue Is the UI-module keys working? No Try to change UI PWB. Are the keys working now? Retest failing UI-module Yes No Check X301 (solder joints and spring contacts). Is it OK? Change X301 No Yes Measure ROW0 - Row4 lines from X301. Are voltage level ~1.8V? No Yes Measure SLEEPX-signal from testpoint J403 when key is pressed. Is voltage level ~1.
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation 'LVSOD\ )DXOW )LJXUH 'LVSOD\ WURXEOHVKRRWLQJ Start Does the display start? No Try to change UI-module. Is the display working now? Yes Retest failing UI-module No Yes Check X302 (solder joints). Is it OK? No Change X302 Yes Measure VDD (2.7V) and VDDI (1.8V). Are they OK? No Check X302 and lines again. If OK, change UEM No Check X302 and lines again.
Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions ,OOXPLQDWLRQ IDXOW )LJXUH %DFNOLJKW WURXEOHVKRRWLQJ Start Are the display LED’s working? No Try to change display. Are the LED’s working now? Yes Retest failing display No Yes Check X302 (solder joints). Is it OK? No Change X302 Yes Are the keyboard LED’s working? No Measure VLED+ and VLED-. VLED+ = ~7.5V and VLED= ~0.5V when LED driver is enabled.
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation &KDUJHU )DXOW )LJXUH &KDUJLQJ WURXEOHVKRRWLQJ Start Battery bars are working (scroll) Yes Retest No Measure voltage over V100 (TVS). Is it > 3.0V? Check X102, F100, L100, V100, C106, C110 and line. No Change defect part (if any), re-calibrate charge current/voltage. Retest. Yes Read BTEMP value. Compare it to ambient temperature. Is it ~25C? No Check X100, C100, R202, R207, C220 and line.
Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions $FFHVVRU\ )DXOW )LJXUH $FFHVVRU\ WURXEOHVKRRWLQJ Start Is accessory detected when connected to system connector? Yes No Check system connector X101 (solder ings, contact plates). Is it OK? No Repair solderings or check contact plates if dirty. Retest. Yes ACI-Accessory Measure ACI-line (pin3). Is it ~0.83...1.13V? Check ACI- line (L106,R103,R102,R109,C103). No If not OK, change defect part and retest.
NHL-4/4U Company confidential Troubleshooting Instructions CCS Technical Documentation $XGLR )DXOW )LJXUH $XGLR WURXEOHVKRRWLQJ Start Is earpiece working? No Try to change earpiece. Is it working now? Yes Retest earpiece No Yes Set phone in LOCAL mode. Use Phoenix audio test. Set EXT IN, HP OUT, LOOP ON Measure DC offset voltage from earpiece pads. Is it ~1.38V? No Check L150, C155, R151, R152 and lines. If OK, change UEM. No Check L102, C116, R150, C159, R153, C150 and line.
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Company confidential CCS Technical Documentation NHL-4/4U Troubleshooting Instructions )LJXUH )0 UDGLR WURXEOHVKRRWLQJ GLDJUDP Set phone into local mode. Start FM radio. NO Does the radio start ? Check C374, C375, R375, R358 and measure 32kHz clock signal from J359, retest starting. Start OK ? Measure voltages from pins 7 and 34, is it –2.7 V ? Retest starting. Start OK now ? NO NO YES Check N356 solders (pins 5,6,7,8,9,11, 12,13,17,33,34,35, 36, 37.
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