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Nokia NHM-4 Series Assembly, Disassembly And Troubleshooting Instructions
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Nokia NHM-4 Series Assembly, Disassembly And Troubleshooting Instructions

Nokia NHM-4 Series Assembly, Disassembly And Troubleshooting Instructions

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Summary of Contents for Nokia NHM-4 Series

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  • Page 3 1+0 'LVDVVHPEO\ ,QVWUXFWLRQV  3KRQH GLVDVVHPEO\ VWHSV  5HDVVHPEO\  %OXHWRRWK PRGXOH UHPRYDO DQG UHDVVHPEO\  7UDQVFHLYHU 7URXEOHVKRRWLQJ   7HVW SRLQWV  6,0 WHVW SRLQWV   %OXHWRRWK WHVW SRLQWV  3RZHU WHVW SRLQWV   /&' 5) DQG )ODVK WHVW SRLQWV   0LVFHOODQHRXV WHVW SRLQWV   )ODVK SURJUDPPLQJ DQG 5) SRZHU VXSSO\ WHVW SRLQWV  7URXEOHVKRRWLQJ VWHSV  ...
  • Page 4 >7KLV SDJH OHIW LQWHQWLRQDOO\ EODQN@ ,VVXH  3DJH ...
  • Page 5 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ NHM-4 Disassembly Instructions Phone disassembly steps Take ESD precautions! Figure 1: Anti-ESD strap donned Open the phone slide. Figure 2: Slide opening Remove the battery cover: open it. Figure 3: Battery cover latch pressed ,VVXH   È1RNLD &RUSRUDWLRQ 3DJH ...
  • Page 6 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Lift up the battery cover Figure 4: Battery cover lifted up Remove the battery cover. Figure 5: Battery cover removal Remove the battery. Figure 6: Battery removal 3DJH  È1RNLD &RUSRUDWLRQ ,VVXH  ...
  • Page 7 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Remove the logo plate: Push the grip downwards at the logo plate - Figure 7: Grip pressed down - and at the same time push the logo plate off. Figure 8: Logo plate removal Remove the antenna: open the locking. Figure 9: Antenna locking opened ,VVXH   È1RNLD &RUSRUDWLRQ...
  • Page 8 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Lift off the antenna. Figure 10: Antenna removal 2 Open the two limiter screws Figure 11: Limiter screws opened Lift up the limiter from the two screw towers. Figure 12: Limiter lifted up 3DJH  È1RNLD &RUSRUDWLRQ ,VVXH  ...
  • Page 9 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ The limiter shown here: Figure 13: Limiter shown Push the limiter backwards and up. Figure 14: Limiter moving Limiter seen from another angle Figure 15: Limiter view ,VVXH   È1RNLD &RUSRUDWLRQ 3DJH ...
  • Page 10 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Open the flex connector: push a tool under the flex connector from the short side corner of the connector - never touching the flex, but the connector only- Figure 16: A tool pushed under the flex connector - and twist Figure 17: Flex connector opening Lift the connector up carefully...
  • Page 11 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ The flex connector opening in practice: insert tool - Figure 19: Flex connector opening 1 - twist Figure 20: Flex connector opening 2 - and lift up carefully Figure 21: Flex connector opened ,VVXH   È1RNLD &RUSRUDWLRQ 3DJH ...
  • Page 12 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Lift the torsion spring from its slot. Figure 22: Torsion spring lifted from slot The spring is lifted. Figure 23: Torsion spring lifted Pull the engine module carefully from the grip. Figure 24: Engine module pulling from the grip 3DJH  È1RNLD &RUSRUDWLRQ ,VVXH  ...
  • Page 13 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Note: avoid bending the limiter when pulling out the engine module. Figure 25: Engine module removed from the grip Remove the limiter. Figure 26: Limiter removed Remove the four screws holding the engine with the A-cover. Figure 27: Preparing to remove four screws ,VVXH   È1RNLD &RUSRUDWLRQ...
  • Page 14 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Open the screws. Figure 28: Opening screws The four screws are removed, note holes Figure 29: Screws removed Lift the engine assembly from the A- cover Figure 30: Engine removed 3DJH  È1RNLD &RUSRUDWLRQ ,VVXH  ...
  • Page 15 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Removed the LCD. Open the board-to-board connector, first on one side - Figure 31: B-to-b connector opened from one side - and then from the other side. Figure 32: B-to-b connector opened from the other side ,VVXH   È1RNLD &RUSRUDWLRQ 3DJH ...
  • Page 16 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Open the locking to the shield by pressing the locking clip with a flat screw- driver. )LJXUH  /RFNLQJ RSHQLQJ LCD removed. Figure 34: LCD removed Remove the system module LA4 off the shield. Figure 35: LA 4 module removal from the shield. 3DJH  È1RNLD &RUSRUDWLRQ ,VVXH  ...
  • Page 17 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Remove the keyboard assembly from the A-cover. Figure 36: Keyboard assembly removal Remove the keymat. Figure 37: Keymat removal 1 Figure 38: Keymat removal 2 ,VVXH   È1RNLD &RUSRUDWLRQ 3DJH ...
  • Page 18 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Remove the User Interface board from the frame. Figure 39: UI board removal Remove the speaker from the A-cover. Figure 40: Speaker removal Remove the buzzer from the A-cover. Figure 41: Buzzer removal 3DJH  È1RNLD &RUSRUDWLRQ ,VVXH  ...
  • Page 19 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Assembly parts of NHM-4 phone: Figure 42: Assembly parts Reassembly Reassembly of the phone is carried out in reverse order to disassembly. The screws cannot be re-used. The screwdriver tip type is Torx T6+ and the torque force is 17ncm The order of tightening the screws is described below: Figure 43: Order of tightening screws ,VVXH  ...
  • Page 20 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Bluetooth module removal and reassembly Take anti-ESD precautions! Figure 44: anti-ESD wrist strap donned Preparing to remove the defective BT module from the circuit board. Use a rework station for CPS components. Figure 45: Module in soldering jig Desoldering nozzle size is 28 x 15 mm.
  • Page 21 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ The desoldering profile is a BT. When the peak step ends, lift the heating head Figure 47: Desoldering profile Pick up the component with tweezers. ,VVXH   È1RNLD &RUSRUDWLRQ 3DJH ...
  • Page 22 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Figure 48: BT module is desoldered The soldering pads are shown below. Figure 49: Soldering pads The BT module is destroyed during desoldering. It must not be reused or reworked! 3DJH  È1RNLD &RUSRUDWLRQ ,VVXH  ...
  • Page 23 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Figure 50: Removed and new BT module Remove old solder from the pads with solder wick. Figure 51: Removing old solder Place a new BT module on the circuit board Figure 52: Placing new BT module Make sure that it is positioned correctly.
  • Page 24 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Figure 53: Flux application Solder the connections pad by pad using a soldering iron with a manywave tip or equal, but NOT with a rework station. Figure 54: Soldering Make sure that there are no solder bridges between the pads and the module shield! Figure 55: Soldered BT module 3DJH ...
  • Page 25 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 7UDQVFHLYHU 7URXEOHVKRRWLQJ 7HVW SRLQWV 6,0 WHVW SRLQWV )LJXUH  6,0 7HVW 3RLQWV 6LJQDO 6LJQDO QDPH )XQFWLRQ 7HVW SRLQW 1RWHV FKDUDFWHULVWLFV 96,0 3RZHU VXSSO\ WR - 9 RU 9 /HYHO GHSHQGHQW 6,0 FDUG RQ 6,0 FDUG W\SH 6,0567 6,0 UHVHW -...
  • Page 26 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ %OXHWRRWK WHVW SRLQWV )LJXUH  %OXHWRRWK WHVW SRLQWV 6LJQDO QDPH )XQFWLRQ 7HVW SRLQW 6LJQDO FKDUDFWHULVWLFV 1RWHV 96,0 3RZHU XS UHVHW 9   9 GLJLWDO VLJQDO /35)&/. 6\VWHP FORFN IRU %7 PRGXOH 9 0+] DQDORJ VLJQDO 5HTXLUHPHQW !9SS 9%$7...
  • Page 27 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ /35)6<1& ([FKDQJHV WLPLQJ LQIR 9   9 GLJLWDO VLJQDO 1HHGHG LQ VOHHS EHWZHHQ %7 DQG 833 PRGH /35),17 ,QWHUUXSW UHTXHVW IRU 833 9   9 GLJLWDO VLJQDO ,QLWLDOOLQJ GDWD WUDQVIHU LQ &%86 ,VVXH  &RS\ULJKWÈ1RNLD $OO ULJKWV UHVHUYHG 3DJH ...
  • Page 28 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 3RZHU WHVW SRLQWV )LJXUH  3RZHU WHVW SRLQWV 6LJQDO 6LJQDO QDPH )XQFWLRQ 7HVW SRLQW 1RWHV FKDUDFWHULVWLFV 9)/$6+ 3RZHU VXSSO\ IRU /&' ,5 %7 &  9 )/$6+ PHP 9$1$ 3RZHU VXSSO\ IRU 8(0 $' 5) &  9 $XGLR &RGHFV 9&25(...
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  • Page 30 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 5)B%86&/. +DJDU FRQWURO VHULDO FORFN   9  0+] GLJLWDO FORFN VLJQDO 5)B%86(1 +DJDU FKLS VHOHFW DQG   9 GLJLWDO VLJQDO ODWFK HQDEOH 5)&/. 6\VWHP FORFN IRU EDVH & 9 DQDORJ VLJQDO 5HTXLUHPHQW EDQG !9SS 3DJH  &RS\ULJKW È1RNLD $OO ULJKWV UHVHUYHG...
  • Page 31 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 0LVFHOODQHRXV WHVW SRLQWV )LJXUH  6LJQDO QDPH )XQFWLRQ 7HVW SRLQW 6LJQDO FKDUDFWHULVWLFV 1RWHV 8(0,17 ,QWHUUXSW UHTXHVW IRU -   9 GLJLWDO VLJQDO '%86&/. '%86 FORFN -   9  0+] GLJLWDO &RQWUROOHG E\ FORFN VLJQDO '%86(1;...
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  • Page 33 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 3RZHU VXSSO\ IRU 9&7&;2 & 9 &RQWUROOHG E\ 6/((3; VLJQDO 3RZHU VXSSO\ IRU +DJDU & 9 3RZHU VXSSO\ IRU +DJDU & 9 3RZHU VXSSO\ IRU +DJDU & 9 3RZHU VXSSO\ IRU 9&2 5 9 ,VVXH  &RS\ULJKWÈ1RNLD $OO ULJKWV UHVHUYHG 3DJH ...
  • Page 34 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ >7KLV SDJH OHIW LQWHQWLRQDOO\ EODQN@ 3DJH  &RS\ULJKW È1RNLD $OO ULJKWV UHVHUYHG ,VVXH ...
  • Page 35 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 7URXEOHVKRRWLQJ VWHSV 7KH IROORZLQJ KLQWV KHOS WR ILQG WKH SUREOHP LI WKH FLUFXLWU\ VHHPV WR EH IDXOW\ 7KH LQVWUXFWLRQV DUH GLYLGHG LQWR IROORZLQJ VHFWLRQV  3KRQH LV WRWDOO\ GHDG  3RZHU GRHV QRW VWD\ RQ RU WKH SKRQH LV MDPPHG  )ODVK SURJUDPPLQJ  &KDUJLQJ IDXOWV  3OXJ LQ 6,0 FDUG LV RXW RI RUGHU LQVHUW 6,0 FDUG ...
  • Page 36 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 0DLQ WURXEOHVKRRWLQJ WUHH  )LJXUH  Main troubleshooting tree, 1 Phone totally Phone is dead dead Flash programming Phone is Phone jammed doesn’t work jammed Phone doesn’t Flash start up or the phone is faults jammed Charging Charger doesn’t work...
  • Page 37 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 0DLQ WURXEOHVKRRWLQJ WUHH  )LJXUH  TOP 2 Phone doesn’t read SIM card SIM card Audio Audio faults faults Display Display or LED’s faults doesn’t work Keypad Keypad doesn’t work faults TOP 3 ,VVXH   È1RNLD &RUSRUDWLRQ 3DJH ...
  • Page 38 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 0DLQ WURXEOHVKRRWLQJ WUHH  )LJXUH  TOP 3 Bluetooth connwction does faults not work Grio open/ close does not Grip switch work electrically faults 3DJH  È1RNLD &RUSRUDWLRQ ,VVXH  ...
  • Page 39 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Phone is dead )LJXUH  Phone is dead Check X101 Phone current solder and is zero ? VBATT lines PWR filter components L260–L265 Is phone Phone is Phone current is flash programing OK ? jammed <25mA Flash faults Phone current is...
  • Page 40 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Phone is jammed, 1 )LJXUH  Phone is jammed Check Check L260–L265 VBATT1–6 C260 – C265 VIO, VCORE, BSI / BTEMP FLASH1, VANA, lines and Measure VR3 lines. Are VBATT lines VIO, VCORE, FLASH1, they OK? VANA, VR3 voltages.
  • Page 41 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Phone is jammed, 2 )LJXUH  Jammed Page 2 Measure watchdog Phone shutdown after signal CBUSDA from Change UPP testpoint J414 Is it OK ? Measure DBUSClk 1MHz signal from testpoint J406 Is it OK ? Measure FBUSRX signal during phone...
  • Page 42 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Flash programming doesn’t work, 1 )LJXUH  Flash faults Measure Check these lines BSI pulse, and X101, MBUS_CLK, FBUS RX DATA C104, C240, when Flash start R202, R206 All OK? Measure FBUSTX line Check R102 at test point J411 If OK –>...
  • Page 43 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Flash programming doesn’t work, 2 )LJXUH  Flash faults page 2 Change Wrong manufactor ID FLASH and Device ID Is the phone Phone is totally dead dead ? Phone doesn’t start up Phone is or the phone jammed is jammed ? Retest...
  • Page 44 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Charging troubleshooting )LJXUH  Connect Charger (ACP–7) charger Battery bar Retest doesn‘t work (not scrolling) Check X100, V100, C113 C118, C112 F100 and line Measure voltage Is grip OK ? over (TVS) V100. Is it > 3.0 Vdc ? Change grip Read Check...
  • Page 45 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ SIM card is out of order (insert SIM card) )LJXUH  SIM card Check BSI line X101, C202 Set phone Insert SIM card C104, C240 in LOCAL mode faults R260 Is it OK ? If OK –> Change UEM Check X386 Check VSIM line,X386,...
  • Page 46 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ >7KLV SDJH OHIW LQWHQWLRQDOO\ EODQN@ 3DJH  È1RNLD &RUSRUDWLRQ ,VVXH  ...
  • Page 47 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Audio troubleshooting 1 )LJXUH  Audio faults Try change earpiece. Is earpiece working? Retest Is it working now ? Connect grip. Set phone in LOCAL mode. Use Phoenix Audio Test. Set EXT IN, HP OUT, LOOP ON. Measure DC Check L151, C160, offset voltage...
  • Page 48 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Audio troubleshooting 2 )LJXUH  Audio faults 2 Try change grip. Is microphone OK ? Retest Is it working now ? Set phone in LOCAL mode. Use Phoenix Audio Test. Set HP IN, EXT OUT, LOOP ON. Check L104 C107, C152, Measure MICB1...
  • Page 49 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Audio troubleshooting 3 )LJXUH  Audio troubleshooting 3 Audio faults 3 Measure VBATT Check VBATT voltage from B301. Is BUZZER working? line Is it OK? Set phone in LOCAL mode. Use Phoenix Audio Test. Set Buzzer volume ON. Measure buzzer control Change...
  • Page 50 UEM (R156) Change UEM. from earpiece pads. Is it ~130mVp–p ? Is it ~880mVp–p ? Check R156, C153, C155, R166, R167, Retest C163, R161 and line. Nokia Corporation Page 27 3DJH  &RS\ULJKW È1RNLD $OO ULJKWV UHVHUYHG ,VVXH  ...
  • Page 51 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Display troubleshooting 1 )LJXUH  Display faults Set phone into local mode. Set VBATT 4.2 V Replace Start Display test with Phenix Set display, keypad lights ON keyboard module Retest Keyboard LEDs now OK ? keyboard Check R313, led’s turned on ? C328 and...
  • Page 52 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Display troubleshooting 2 )LJXUH  Display faults 2 Check LED‘s and line Are the display led’s turned on ? Measure DC voltage from V324, V325 anode Is it 4.1 V ? Measure Lines to LEDs broken DC voltage from Change LA4 module R310...
  • Page 53 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Display troubleshooting 3 )LJXUH  Display faults 3 Try change Display module Retest Is it working now ? Does the display start ? Check X300 Measure Check C303 VDD (2.78V) and and solders VDDI (1.8V) from If OK, X300 lines to X300...
  • Page 54 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Keypad troubleshooting 1 )LJXUH  Keypad faults Check R301, Measure voltage C312, S302 Is the power key OK ? from S302 and line. Is it HIGH ? If OK –> Change UEM Measure voltage from S300 when Change S302 power key is pressed.
  • Page 55 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ .H\SDG WURXEOHVKRRWLQJ  Keypad faults 2 Are LK 4 Try change LK 4 module keys OK ? Retest Is it working now ? Check X303 Measure Check ROW0 – ROW0 to ROW4 4 Lines, X303. If OK change lines from X303 Z301.
  • Page 56 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Bluetooth troubleshooting )LJXUH  Bluetooth faults Is BT flashing OK ? Phoenix SW BT locals. Run self–tests. All passed? Check VBAT (pads 52–54) Check BT VIO (pads 18, 32, 49/1.8VDC) antenna VFLASH1 (pad 6/2,8VDC) connections. If OK–> All OK ? change antenna...
  • Page 57 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ Grip switch troubleshooting )LJXUH  Grip switch faults Cannot answer/end call when open/close grip Change grip. Now OK? Retest Measure S300/pin 1 Is it 2.8VDC? Check R327, C319 If OK –> replace S300 Phoenix ADC reading Is ”Resistive keyboard 1”...
  • Page 58 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ >7KLV SDJH OHIW LQWHQWLRQDOO\ EODQN@ 3DJH  &RS\ULJKW È1RNLD $OO ULJKWV UHVHUYHG ,VVXH  ...
  • Page 59 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 5) 7URXEOHVKRRWLQJ ,QWURGXFWLRQ 0HDVXUHPHQWV PXVW EH GRQH XVLQJ VSHFWUXP DQDO\]HU ZLWK KLJKIUHTXHQF\ KLJKLPSHG DQFH SDVVLYH SUREH /2UHIHUHQFH IUHTXHQFLHV DQG 5) SRZHU OHYHOV DQG RVFLOORVFRSH ZLWK D  SUREH '&YROWDJHV DQG ORZ IUHTXHQF\ VLJQDOV  7KH 5)VHFWLRQ LV EXLOG DURXQG RQH 5)$6,& +$*$5 1  %HIRUH FKDQJLQJ +$*$5 SOHDVH FKHFN IROORZLQJ WKLQJV 6XSSO\ YROWDJHV DUH 2.
  • Page 60 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 6HW WKH SKRQH PRGXOH WR WHVW MLJ DQG VWDUW 3KRHQL[ VHUYLFH VRIWZDUH ,QLWLDOL]H FRQQHFWLRQ WR SKRQH XVH )%86 GULYHU ZKHQ XVLQJ '$86 DQG &20%2; GULYHU ZKHQ XVLQJ )36 6HOHFW SURGXFW IURP WKH PHQX )LOH ! &KRRVH SURGXFW ! 1+0 )URP WRROEDU VHW RSHUDWLQJ PRGH WR /RFDO  $FWLYDWH 5) FRQWUROV ZLQGRZ IURP WKH PHQX 0DLQWHQDQFH ! 7XQLQJ ! 5) &RQWUROV...
  • Page 61 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 7UDQVPLWWHU WURXEOHVKRRWLQJ GLDJUDP )LJXUH  7UDQVPLWWHU WURXEOHVKRRWLQJ TX OK TX troubleshooting Tune Tx Check all Check output signal level power power +32 dbm@897.4 MHz (GSM900) levels levels +29 dBm@1747.8MHz (GSM1800) Check output signal Synthesizer troubleshooting TX signal found ? on 500 MHZ span.
  • Page 62 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ +DJDU WURXEOHVKRRWLQJ )LJXUH  +DJDU WURXEOHVKRRWLQJ HAGAR troubleshooting Check with oscilloscope –TXI/TXQ signals Baseband troubleshooting –VR2, VR4, VR6 = 2.7V -VrefRF01, VrefRF02 = 1.35V -HAGAR serial interface -TXP & TXC signals Check with RF probe 4G VCO out signal Synthesizer troubleshooting 3589.6 MHz (GSM900) 3495.6 MHz (GSM1800)
  • Page 63 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ $QWHQQD VZLWFK WURXEOHVKRRWLQJ )LJXUH  3$ $QWHQQD 6ZLWFK *When 1kOhm passive probe is used, PA&ant. switch correct measurement result by +26dB troubleshooting Check with RF probe Check with oscilloscope PA output signal level * PA ctrl voltage Replace HAGAR >1.5V peak Check with oscilloscope...
  • Page 64 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 7UDQVPLWWHU VLJQDOV )LJXUH  /HIW 7;B,B2 7; RQ UDQGRP GDWD EXUVW PRGH 5LJKW 7;B4B2 7; RQ UDQGRP GDWD EXUVW PRGH )LJXUH   DQWVZ W[ FRQWU 7[ RQ %XUVW PRGH )LJXUH  /HIW  3$ ELDV 7[ RQ EXUVW PRGH 5LJKW  3$ FWUO 7[ RQ EXUVW PRGH KLJK SRZHU OHYHO 3DJH  &RS\ULJKW È1RNLD $OO ULJKWV UHVHUYHG...
  • Page 65 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ )LJXUH  7[ RXW VLJQDO  EDQG EXUVW PRGH FKDQQHO  5HFHLYHU *HQHUDO LQVWUXFWLRQV &RQQHFW WKH WHVW MLJ WR WKH FRPSXWHU ZLWK '$86 FDEOH RU WR )36 )ODVK 3URPPHU ZLWK ;&6 PRGXODU FDEOH 0DNH VXUH WKDW \RX KDYH 3.' GRQJOH FRQQHFWHG WR WKH SDUDOOHO SRUW RI WKH FRPSXWHU &RQQHFW WKH '&...
  • Page 66 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ  6HOHFW EDQG *60 RU *60  'HIDXOW *60  6HW $FWLYH XQLW WR 5[ 'HIDXOW 5[  6HW 2SHUDWLRQ PRGH WR &RQWLQXRXV 'HIDXOW %XUVW  6HW $*& WR  )(* 21   G% 'HIDXOW  )(* 21   G%  6HW 5[7[ FKDQQHO WR  RQ *60 EDQG RU  RQ *60 EDQG 'HIDXOWV ...
  • Page 67 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 5HFHLYHU WURXEOHVKRRWLQJ GLDJUDP IRU *60 )LJXUH  Apply –90dBm 942.46771 MHz signal from Check generator to antenna connector antenna switch Z500 Oscilloscope at RX_I Spectrum Spectrum Spectrum Change Signal 700mVpp analyzer analyzer analyzer generator DC offset 1.35V level 900 LNA out 1st SAW out...
  • Page 68 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 5HFHLYHU WURXEOHVKRRWLQJ GLDJUDP IRU *60 )LJXUH  Apply –90dBm 1842.86771 MHz signal from Check generator to antenna connector antenna switch Z500 Oscilloscope at RX_I Spectrum Spectrum Spectrum Change Signal 700mVpp analyzer analyzer analyzer generator DC offset 1.35V level 1800 LNA out 1800 1st SAW...
  • Page 69 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ /1$ JDLQVWHS FKHFNLQJ *60 *60  /1$ RXW  /1$ RXW  5)OHYHO DW DQWHQQD SRUW HJ  G%P  5)OHYHO DW DQWHQQD SRUW HJ  G%P  5; FRQWLQXRXV PRGH ORFDO PRGH  5; FRQWLQXRXV PRGH ORFDO PRGH  GLIIHUHQFH EHWZHHQ $*&...
  • Page 70 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 6\QWKHVL]HU *HQHUDO LQVWUXFWLRQV &RQQHFW WHVW MLJ WR FRPSXWHU ZLWK '$86 FDEOH RU WR )36 )ODVK 3URPPHU ZLWK ;&6 PRGXODU FDEOH 0DNH VXUH WKDW \RX KDYH 3.' GRQJOH FRQQHFWHG WR FRPSXWHUV SDUDOOHO SRUW &RQQHFW '& SRZHU VXSSO\ RU )36 WR PRGXOH WHVW MLJ ZLWK )/& FDEOH 6HW WKH '&...
  • Page 71 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ 6\QWKHVL]HU WURXEOHVKRRWLQJ GLDJUDP )LJXUH  Synthesizer troubleshooting Set with RF Controls: -Active Unit = Rx Operation Mode = Continuous Synthesizer OK Check with RF probe 4G VCO out signal 3769.6 MHz (GSM900) 3685.6 MHz (GSM1800) *When 1kOhm passive probe is used, Level>–10dBm * correct measurement result by +26dB Check balun output levels...
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  • Page 73 1+0 &&6 7HFKQLFDO 'RFXPHQWDWLRQ )LJXUH  *+[ 9&2 RXW ,VVXH   &RS\ULJKW È1RNLD $OO ULJKWV UHVHUYHG 3DJH ...
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