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CCS Technical Documentation

RH-3 Series Transceivers

Issue 1 06/2003 Confidential

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Nokia Corporation

Troubleshooting - RF

Содержание RH-3 Series

Страница 1: ...CCS Technical Documentation RH 3 Series Transceivers Issue 1 06 2003 Confidential Nokia Corporation Troubleshooting RF ...

Страница 2: ...RH 3 Troubleshooting RF CCS Technical Documentation Page 2 Nokia Corporation Confidential Issue 1 06 2003 ...

Страница 3: ...ake a Call 6 Transmitter Troubleshooting 7 Cell Transmitter 7 PCS Transmitter 14 Receiver Troubleshooting 21 Cell Receiver 21 PCS Receiver 28 GPS Troubleshooting 36 GPS Receiver 36 GPS RF Quick Fault finding Chart 39 Block Diagrams 40 Transmitter 40 Receiver 40 Synthesizer 41 GPS 41 Frequency Plan 42 Jedi 42 Yoda 43 Description of RF ASICs 43 Jedi N601 43 Yoda N700 44 Alfred N901 44 Orca N803 44 S...

Страница 4: ...RH 3 Troubleshooting RF CCS Technical Documentation Page 4 Nokia Corporation Confidential Issue 1 06 2003 ...

Страница 5: ...ooter is not expected to probe each point on every phone only the suspected trouble spots Absolute power measurements were made with an Agilent HP 85024A active high impedance probe Other probes can be used but should be high impedance so that the measurement does not load the circuit but may very well have a different gain there fore adjust the absolute measurements accordingly Also adjust if usi...

Страница 6: ...upplies to transmitter have correct voltage Receiver Not Working Properly If Receiver is not working properly turn on receiver in local mode and check 1 Turn on receiver with Phoenix inject a signal into the receiver 2 Check the AGC PDM 3 Perform a visual inspection of the PWB under a microscope to check proper placement rotation and soldering of components 4 Measure signal levels at various point...

Страница 7: ...to probe when troubleshooting the cell transmitter path The steps shown are the recommended but do not have to be followed in that order Refer to the Appendix for a reference diagram that illustrates the test points on the circuit board An HP high frequency probe is used to make the frequency and output power measurements Constant Reference Values CELL Oscillator and IF VHF Tx Lo 457 2 Tx IF 228 6...

Страница 8: ...Step Part Part Ref Label Test Point Typical Value Units Comments 1 Jedi Pin 7 I J601 0 1 to 0 9 1 7 VAC VDC Test Point on BB side 2 Jedi Pin 8 I J602 0 1 to 0 9 1 8 VAC VDC 3 Jedi Pin 4 Q J603 0 1 to 0 9 1 9 VAC VDC 4 Jedi Pin 5 Q J604 0 1 to 0 9 1 10 VAC VDC 5 Jedi Pin 45 IF CELL top C603 45 228 6 dBm 30kHz MHz 6 Jedi Pin 46 IF CELL bottom C603 45 228 6 dBm 30kHz MHz 7 Jedi Pin 31 CELL_DRVout pin...

Страница 9: ...pin3 Z601 right R814 PA Power and Gain Specifications Mode Name Power Output Range Nominal Gain Vcc Range Vcc Test Point Gain mode 0 V0 up to 9 23 8 0 75 0 88 C806 Gain mode 1 V1 9 to 13 25 2 1 125 1 375 C806 Gain mode 3 V2 Not used Not used 2 2 5 C806 Gain mode 2 Bypass 13 up 29 3 4 C806 Overall Gain V0 to Bypass 9 3 5 to 7 3 0 5 unit N A dBm dB VDC N A PA Gain Step Gen IO 12 GenIO13 PA Vcc volt ...

Страница 10: ... with pin 5 7 BYPVout bottom C808 0 75 4 M0 M1 PMIC bypass output used at Pout 12 dBm 8 VDD right L810 VBATT VBATT Digital DC supply shared with pin 12 14 15 9 VSS GND GND GND Digital GND shared gnd with pin 13 10 NC NC NC NC NC 11 Vbgap NC NC NC Bandgap voltage output 12 VDD right L810 VBATT VBATT Digital DC supply 13 Vss GND GND GND Digital GND shared gnd with pin 9 14 Vsw right L810 VBATT VBATT...

Страница 11: ...and PA Control The following table illustrates the PDM values and their typical values for the IF AGC RF AGC Jedi Pout Gain steps and the PA VCC levels It also shows the typical power output at the RF connector 6 2M 7 2M 8 2M 9 0 1 10 100 11 115k 12 60k 13 0 2 14 1 3M 15 1 18M 16 0 1 Good phone PMIC Resistances Pin Resistance ...

Страница 12: ...2 Gen IO 13 Typi cal Valu e Test Point PA Gain 324 0 41 Bottom C606 324 0 41 Top C605 17 pin 1 Z601 H H 3 47 C806 DM 25 226 0 56 226 0 56 21 H H 3 61 28 20 146 0 68 146 0 68 21 H H 3 67 28 15 1 146 0 68 146 0 68 27 H L 1 2 26 13 111 0 74 111 0 74 28 H L 1 2 25 8 10 3 111 0 74 111 0 74 28 L L 0 82 24 5 9 6 0 9 6 0 9 35 L L 0 82 0 52 1 52 1 45 L L 0 82 10 105 1 09 105 1 09 54 L L 0 82 20 180 1 09 18...

Страница 13: ...d detector cou pling is about 22 dB 140 L L 25 63 2 235 5 L L 0 41 1 998 235 105 L L 9 30 1 967 250 105 H L 10 29 1 957 268 143 H L 13 26 1 93 286 143 H H 14 9 23 5 1 9 435 175 H H 17 21 5 1 86 486 210 H H 19 19 1 812 550 246 H H 21 17 1 745 630 286 H H 23 15 1 667 730 330 H H 25 12 1 547 860 352 H H 26 11 5 1 485 950 365 H H 26 5 11 1 44 1000 387 H H 27 5 10 1 36 1095 none dBm dBm 30kHz VDC dBm o...

Страница 14: ...ts on the circuit board An HP high frequency probe is used to make the frequency and output power measurements VDC Constant Reference Values PCS Oscillator and IF VHF Tx Lo 527 2 Tx IF 263 6 VHF Rx Lo 367 2 Rx IF 183 6 Setup Mode Tx Rx Band CW or CDMA BB GenIO PDM Rho Local On On PCS CELL CDMA GenIO 8 H Tx IF and RF AGC 0 On Chnn Tx Freq Rx Freq UHF GenIO 12 L 384 836 52 881 52 1065 12 GenIO 13 L ...

Страница 15: ...r is leakage 8 Jedi Pin 31 PCS_DRVout_B right L605 30 1880 dBm 30kHz MHz B output is for channs 600 to 1175 9 Z602 Pin 1 SAW out A pin3 N602 56 dBm 30kHz The outputs of Z602 and the inputs to N602 are difficult to reach 10 Z602 Pin 3 SAW out B pin 1 N602 32 dBM 30kHz If not necessary skip to the PA input measure ment 11 Shamu Pin 4 RF in left C640 32 dBm 30kHz 12 Shamu Pin 8 PA out left R803 9 dBm...

Страница 16: ...plifier Input Test Point Power Amplifier Output Test Point 1 Power Amplifier Output Test Point 2 right C640 left R803 right C804 inaccessible unless shield can is removed no lid This is the coupled power You must 30 dB to get correct value PCS PA Power and Gain Specifications Mode Name Power Output Range Nominal Gain Vcc Range Vcc Test Point Gain mode 0 V0 up to 8 22 4 0 75 0 88 C806 Gain mode 1 V...

Страница 17: ...5 0 75 4 M0 M1 See PA worksheet Output to fly back inductor 6 FB Pin 6 0 75 4 M0 M1 Shares PWB pad with pin 5 7 BYPVout bottom C808 0 75 4 M0 M1 PMIC bypass output used at Pout 12 dBm 8 VDD right L810 VBATT VBATT Digital DC supply shared with pin 12 14 15 9 VSS GND GND GND Digital GND shared gnd with pin 13 10 NC NC NC NC NC 11 Vbgap NC NC NC Bandgap voltage output 12 VDD right L810 VBATT VBATT Di...

Страница 18: ...e following table illustrates the PDM values and their typical values for the IF AGC RF AGC Jedi Pout Gain steps and the PA VCC levels It also shows the typical power output at the RF connector Good phone PMIC Resistances Pin Resistance 1 60k 2 75k 3 80k 4 1 59M 5 1 6M 6 2M 7 2M 8 2M 9 0 1 10 100 11 115k 12 60k 13 0 2 14 1 3M 15 1 18M 16 0 1 ...

Страница 19: ... IO 13 Typi cal Valu e Test Point PA Gain 133 0 71 Bottom C606 133 0 71 Top C605 17 right L605 H H 3 55 C806 DM 23 96 0 77 96 0 77 19 H H 3 65 30 20 52 0 83 52 0 83 25 H H 3 65 30 16 3 52 0 83 52 0 83 25 H L 1 2 26 12 31 0 86 31 0 86 28 H L 1 2 26 10 3 31 0 86 31 0 86 28 L L 0 81 25 8 39 0 98 39 0 98 36 L L 0 81 25 0 91 1 07 91 1 07 46 L L 0 82 25 10 159 1 18 159 1 18 58 L L 0 82 27 20 244 1 32 24...

Страница 20: ... L 0 41 5 right R814 2 left C807 255 RF amplifier has the most gain increase near 0 dBm 30 L L 8 33 right R814 1 986 left C807 263 30 H L 10 2 31 right R814 1 984 left C807 278 51 H L 12 29 right R814 1 979 left C807 285 72 H H 18 21 5 right R814 1 93 left C807 473 85 H H 19 21 right R814 1 914 left C807 500 108 H H 21 19 right R814 1 882 left C807 557 133 H H 23 17 right R814 1 84 left C807 634 1...

Страница 21: ... Step Part Part Ref Label Test Point Typical Value Units Comments 1 Diplexer none RF Conn Diplexer Pin 3 73 dBm 30kHz 2 Alfred Pin 11 CELL LNA input Alfred Pin 11 68 dBm 30kHz expected LNA gain 12 to 14 dB 3 Alfred Pin 13 CELL LNA output bottom L901 59 dBm 30kHz Yoda register 6 Defaults to high gain mode 4 Alfred Pin 16 CELL Mixer input Alfred Pin 16 53 dBm 30kHz Note that this is a passive device...

Страница 22: ...same and look distorted 11 Yoda Pin 8 Qb out J704 0 to 0 6 1 3 VAC VDC see TS picts 2 doc 3 4 5 SA view of BB I or Q 12 Yoda Pin 7 Q out J703 0 to 0 6 1 3 VAC VDC see TS picts 2 doc 3 4 5 SA view of BB I or Q 13 Yoda Pin 8 lb out J702 0 to 0 6 1 3 VAC VDC see TS picts 2 doc 3 4 5 SA view of BB I or Q 14 Yoda Pin 9 1 out J701 0 to 0 6 1 3 VAC VDC see TS picts 2 doc 3 4 5 SA view of BB I or Q Consta...

Страница 23: ... BAND left C911 Q 2 63 VDC Yoda 4 P_MIX_IN left L911 NA 72 1960 dBm MHz band PCS band 5 P_RFA_VD D top R910 2 7 2 7 VDC VR4 PCA band 6 GND NA NA NA NA NA 7 GAIN_CTL left C909 2 7 2 7 VDC Yoda LNA gain switch 8 P_LNA_OU T bottom C902 NA 69 1960 dBm MHz band PCS band 9 GND NA NA NA NA NA 10 P_LNA_IN Pin 10 NA 83 1960 dBm band PCS band 11 C_LNA_IN Pin 11 80 881 52 NA dBm MHz band CELL band 12 GND NA ...

Страница 24: ...A_OU T left L909 42 183 6 44 dBm MHz Alfred provides about 40 dBm of overall 23 IF_SEL Pin 23 0 0 VDC Always gnded for this frequency plan 24 LQ_IN top L 904 1 1065 12 2 4 2143 6 dBm MHz UHF LO Constant Reference Values Cell Oscillator and IF VHF Tx Lo 457 2 Tx IF 228 6 VHF Rx Lo 367 2 Rx IF 183 6 Setup Mode Tx Rx Band CW or CDMA Pin Default PDM LNA Gain Mode Local Off On PCS CELL CW 80dBm RX IF A...

Страница 25: ...5 0 2 1 25 0 2 VDC VAC 8 lb J702 1 25 0 2 1 25 0 2 VDC VAC 9 l J701 1 25 0 2 1 25 0 2 VDC VAC 10 OFFI right C735 1 65 1 65 VDC I signal DAC Off set high freq tx 11 OFFQ left C736 1 65 1 65 VDC Q signal DAC Off set high freq tx 12 CLK BB J450 2 2 9 6 2 2 9 6 VAC MHz UPP RF_CLK VCTCXO 2 bursts 13 DATA BB J451 2 2 2 2 VAC UPP Digital control data for Yoda 14 LE BB J452 2 2 2 2 VAC UPP Enable pin for ...

Страница 26: ..._1b NC NC NC NC NC NC 26 OUT3_CTR L_TEST_1 Pin 7 TL 2 7 0 VDC G501 synthesizer band select 27 OUT2_CTR L_TEST_Qb bottom R904 0 2 7 VDC Alfred RF band select 28 OUT1_CTR L_TEST_Q bottom R902 27 0 27 0 VDC H VDC L Alfred LNA gain state control 29 AVDD_MIX bottom C712 2 7 2 7 VDC VR6 Mixer analog DC voltage supply 30 AVDD_if bottom C744 2 7 2 7 VDC VR6 Mixer analog DC voltage supply 31 VGA_IN right C...

Страница 27: ...36 200 0 597 100 0 753 0 0 913 100 1 076 200 1 24 300 1 403 350 1 484 400 1 565 500 1 727 511 1 745 UNITS VDC Rx AGC vs RF Pin for CELL and PCS Bands Conn RF Pin CELL RF AGC PCS RF AGC Comments 25 1 485 1 512 35 1 298 1 336 45 1 159 1 18 In Normal mode the phone will adjust RF RX AGC 55 1 019 1 039 Rx power is coming in the I and Q will be about 0 5 Vpp and 1 3 V 65 0 861 0 896 75 0 728 0 747 Appr...

Страница 28: ...d on 96 0 651 0 646 LNA switch hysteresis 94 on the way down 89 on the way up 100 0 594 0 59 105 0 524 0 59 107 0 493 0 485 UNITS VDC VDC PCS CDMA Rx Test Setup Input power 50 dBm Input Freq 1960 MHz Rx AGC PDM 225 PDM CDMA Generator Code Domain Setup Channel Power Walsh code Pilot 7 dB 0 Paging 12 dB 1 Traffic 15 6 dB 10 Sync 16 dB 32 Rx AGC vs RF Pin for CELL and PCS Bands Conn RF Pin CELL RF AG...

Страница 29: ...Pin 18 IF AMP input right C906 50 dBm 30kHz 7 Alfred Pin 22 IF output 565 ohms left L909 31 dBm 30kHz 8 Z701 Pin 5 IF filter input top L702 39 dBm 30kHz 9 Yoda Pin 31 VGA input 1 right C702 56 dBm 30kHz 10 Yoda Pin 32 VGA input 2 right C707 58 dBm 30kHz 11 Yoda Pin 6 Qb out J704 0 to 0 6 1 3 VAC VDC 12 Yoda Pin 7 Q out J703 0 to 0 6 1 3 VAC VDC 13 Yoda Pin 8 lb out J702 0 to 0 6 1 3 VAC VDC 14 Yod...

Страница 30: ... band 5 P_RFA_VDD top R910 2 7 2 7 VDC VR4 PCS band 6 GND NA NA NA NA NA 7 GAIN_CTL left C909 2 7 2 7 VDC Yoda LNA gain switch 8 P_LNA_OUT bottom C902 NA 69 1960 dBm MHz band PCS band 9 GND NA NA NA NA NA 10 P_LNA_IN Pin 10 NA 83 1960 dBm band PCS band 11 C_LNA_IN Pin 11 80 881 52 NA dBm MHz band CELL band 12 GND NA NA NA NA NA 13 C_LNA_OUT bottom L901 69 881 52 NA dBm MHz band CELL band 14 VDD to...

Страница 31: ...PS_OUT NC NC NC NC NC no AMPS in this application 21 GND NA NA NA NA NA 22 CDMA_OUT left L909 42 183 6 44 dBm MHz Alfred provides about 40 dBm overall 23 IF_SEL pin 23 0 0 VDC always gnded for this frequency plan 24 LO_IN top L904 1 1065 2 2 4 2143 6 dBm MHz UHF LO Measurements Pin Label Test Point CELL Typical Value PCS Typical Value Units Depends on Comments ...

Страница 32: ...52 1065 12 600 1880 1960 2143 6 Measurements Pin Label Test Point CELL Typical Value PCS Typical Value Units Depends on Comments 1 AGC_CON right C703 0 916 0 916 VDC UPP RX_IF_AGC GenIO 09 Equals 0 918 VDC when 0 2 AGC_REF right C725 1 8 1 8 VDC VIO PDM 0 3 VREF right C731 1 36 1 36 VDC UEM pin H13 same as RF_CONV0 9 at UEM 4 RBIAS right R706 1 21 1 2 VDC UEM sets internal bias current 5 AVDD_RX r...

Страница 33: ... TCXO_IN right C728 5 19 2 5 19 2 dBm MHz VCTCXO VCTCXO input to Yoda 19 DVDD_SYN TH left C704 1 8 1 8 VDC VIO Digital Yoda syn thesizer DC supply 20 AVSS_SYN TH GND GND GND GND GND GND 21 AVDD_SYN TH left R703 2 75 2 75 VDC VR7 Analog Yoda syn thesizer DC supply 22 CP right C754 7 5 367 2 7 367 2 dBm MHz Charge pump out put 23 VCO_TANK b left C754 1 367 2 1 367 2 dBm MHz pin 22 VR7 VCO external v...

Страница 34: ... voltage supply 30 AVDD_if bottom C744 2 7 2 7 VDC VR6 Mixer analog DC voltage supply 31 VGA_IN right C707 70 183 6 73 183 6 dBm MHz Alfred out put Yoda RF input A from Alfred 32 VGA_INB right C702 70 183 6 73 183 6 dBm MHz Alfred out put Yoda RF input B from Alfred Measurements Pin Label Test Point CELL Typical Value PCS Typical Value Units Depends on Comments ...

Страница 35: ... 597 100 0 753 0 0 913 100 1 076 200 1 24 300 1 403 350 1 484 400 1 565 500 1 727 511 1 745 UNITS VDC Rx AGC vs RF Pin for CELL and PCS Bands Conn RF Pin CELL RF AGC PCS RF AGC Comments 25 1 485 1 512 35 1 298 1 336 45 1 159 1 18 In Normal mode the phone will adjust RF RX AGC 55 1 019 1 039 Rx power is coming in the I and Q will be about 0 5 Vpp and 1 3 V 65 0 861 0 896 75 0 728 0 747 Approximatel...

Страница 36: ... inter stage filter LNA TCXO and down converter circuitry In this RF troubleshooting document tolerances are specified for critical GPS RF signals and voltages Before changing a single ASIC or component please check the following 1 The soldering and alignment marks of the GPS ASICs 2 Supply voltages and control signals are OK The RF ASIC module is static discharge sensitive So it is recommended to...

Страница 37: ...st be checked visually There are no parameters in GPS RF which should be tuned externally Accurate signal levels are not shown in the flowcharts below because of the figures apply with specific measurement probes It is useful to compare the results against reference phones Test Equipment 1 Signal generator up to 2 GHz 2 Oscilloscope with 10 1 passive probe 3 High Frequency Probe for Spectrum Analy...

Страница 38: ...ck diagram of the GPS RF Figure 1 GPS RF Functional Diagram 16 368 MHz TCXO BPF Programming Interface Loop Filter ImageReject Mixer LO 1571 328 MHz 2 AGC VCO Tank Oscillator 2 8 12 Ph ase Det 4 4 Bit ADC 4 092MHz DATA CLOCK ENABLE fcomp 16 368MHz IF out Test Points LO 8 Test Point 196 416 MHz ADCout IFout GPS Clock LO 8 Test SPI LNA SAW 1575 42 MHz ...

Страница 39: ...shooting GPS Testing GPS Receiver Control AMS Receiver ON Check 19 2 MHz GPS_RFCLK signal J009 Check 16 368 MHz GPS_CLK signal J008 Start CDMA troubleshooting VCTCXO etc Measure VRF_GPS at C017 Replace regulator N051 Replace TCXO B001 Check the 196 416 MHz LO 8 at J005 Measure VIO at C067 Start CDMA BB troubleshooting UEM etc Replace GPS RF ASIC N054 Replace filter Z003 Replace transistor V001 Rep...

Страница 40: ... It illustrates every major component from the antenna port all the way to I and Q baseband Figure 4 Receiver Block Diagram 2 4 0º 90º VHF LO I Q 0º 90º UHF LO 0º 90º 0º 90º S P D T S P D T Power Detector Diplexer PCS RX Cell RX Antenna Cell TX PCS TX Duplexer Isolator Duplexer Isolator To Baseband From Baseband LNA SW Control RFA VHF PLL 367 2 MHz 2 I Q Down Converter CDMA BB Filter BB AMP CDMA B...

Страница 41: ...lock diagram of the GPS RF Figure 6 GPS RF Block Diagram JEDI VHF counter UHF counter Yoda VHF counter 367 2MHz CELL 457 2MHz PCS 527 2MHz Dual Band UHF VCO 19 2MHz to UPP 19 2MHz VCTCXO 16 368 MHz TCXO BPF Programming Interface Loop Filter ImageReject Mixer LO 1571 328 MHz 2 AGC VCO Tank Oscillator 2 8 12 Ph ase Det 4 4 Bit ADC 4 092MHz DATA CLOCK ENABLE fcomp 16 368MHz IF out Test Points LO 8 Te...

Страница 42: ...d block diagram of the frequency plan Figure 7 Frequency Plan Block Diagram Jedi The following figure illustrates a detailed block diagram of the Jedi TX chip Figure 8 Jedi Block Diagram 2 π 2 π TX Block RX Block TX I TX Q RX Q RX I CELL 457 2MHz PCS 527 2MHz CELL PCS 367 2MHz CELL 1052 61 1077 57MHz PCS 2113 6 2173 55MHz CELL 228 6MHz PCS 263 6MHz CELL PCS 183 6MHz ...

Страница 43: ... N601 In this dual mode transmitter the BB I and Q signal input buffer modulator IF VGA up converter RF VGA and the PA driver will be integrated on a single IC called Jedi This Tx IC Jedi includes VHF synthesizers with external tanks and the UHF PLL circuitry exclud ing VCOs This Tx IC plus Cell and PCS band power amplifiers SAW filters power detec tors isolators and duplexers form the transmitter...

Страница 44: ... IC named Alfred and an IF BB IC called Yoda are used to cover overall dual mode receiver function and there fore the external parts count of the receiver is significantly reduced Orca N803 The Orca power amplifier is designed for the CELL frequency band Shamu N802 The Shamu power amplifier is designed for the PCS frequency band GPS ASIC N054 The GPS ASIC is a highly integrated IC which contains a...

Страница 45: ...hooting RF RH 3 Issue 1 06 2003 Nokia Corporation Confidential Page 45 The following figure is the assembly drawing of the bottom of the board Figure 11 PWB Bottom View Power Amplifier PA Module test points Figure 12 PA Module test points ...

Страница 46: ...oubleshooting RF CCS Technical Documentation Page 46 Nokia Corporation Confidential Issue 1 06 2003 The following figure is the close up view of the transmitter section of the board Figure 13 Transmitter view ...

Страница 47: ...H 3 Issue 1 06 2003 Nokia Corporation Confidential Page 47 The following diagram indicates the TX Module test point Figure 14 TX Module test point The following figure is the close up view of the receiver section of the board Figure 15 Receiver view ...

Страница 48: ...RH 3 Troubleshooting RF CCS Technical Documentation Page 48 Nokia Corporation Confidential Issue 1 06 2003 Figure 16 Receiver Yoda test points ...

Страница 49: ...g figure is the close up view of the synthesizer section of the board Figure 17 Synthesizer Module test points Test Point Component Measure 48 G501 2 7 VDC 49 G501 3 dBm 1065 12 MHz Cell 3 dBm 2146 3 MHz PCS 50 L501 1065 12 MHz Cell 2146 3 MHz PCS 51 C505 2 72 VDC 52 C510 5 dBm 19 2 MHz 53 C521 2 8 VDC 54 R517 1 26 VDC ...

Страница 50: ...ure that the ADC changes as each AGC is changed indi vidually Check the AGC voltages and components of the associated PDMs For problems with the IF or RF AGC also check Jedi and supporting components For PA AGC problems also check the PA and supporting components If all of the above cases fail troubleshoot the TX chain If all the output powers are pass ing then perhaps the test is failing because ...

Страница 51: ...band CDMA receiver DC offsets until they are within the limits Check Yoda N701 and supporting compo nents TX Start up Current This test turns on the transmitter PCS transmitter for PCS only phones and measures current of the whole phone which can detect some assembly errors If current is very high there may be a short circuit on the phone caused by a solder bridge a failed component that is intern...

Страница 52: ... 3 In the following procedure performing frequency centering on the RF carrier at 1880 MHz will detect frequency errors due to the VCTCXO and supporting hardware which will be the majority of the problems but will not detect frequency errors due to the hardware that mixes the VCTCXO tone at 19 2 MHz up to 1880 MHz In order to troubleshoot this hardware also frequency centering should be performed ...

Страница 53: ... to approximately their maximum used values not the maxi mum possible values but the maximum of the range over which they are used Then the TX IF AGC is set so that the transmit power on the antenna connec tor is approximately 11 dBm this power is reported in the next tuning Then six PDM values are written to the PA AGC and the output power is meas ured for each These values are reported in this t...

Страница 54: ... is equal to 8 0 dBm 0 5 dB Use the G_Offset limit range as a guide to which values to enter Once this is done on the center channel change to each of the other channels and record the power Do not adjust G_Offset on the other chan nels just record the power It should be within the limits listed in the tuning results file Channel Cell PCS Low 991 25 LowMid 107 200 MidLow 245 400 Mid 384 600 MidHig...

Страница 55: ... so it is a power delta in dB Band power is measured at the center tuned frequency and also at an offset lower higher than the center fre quency and the difference is ACPR For this test the offset is 1 25 MHz 1 25 MHz If one or more of the AGC values needs a value much higher than normal to achieve maximum power then that would indicate that a component in the chain has less gain or more loss than...

Страница 56: ...RxdBCtr which is automatically adjusted to produce the same amplitude on the receiver output no matter what the input is for the receiver with the LNA in high gain mode and again with the LNA in low gain mode For Cell and PCS it is done over several channels Check Alfred and supporting components Tuning Title Description Troubleshooting ...

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