Nokia NPD-1 Series Troubleshooting - Rf Download Page 62

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NPD-1

Troubleshooting — RF

CCS Technical Documentation

Page 62



Nokia Corporation Confidential

Issue 1 11/2002

Figure 20: AMPS AGC Algorithm

-10

-30

-20

TOTAL

IF AGC

PA AGC

RF AGC

-40

IN dB

Output Power dBm
dBm dBm

AMPS AGC

AMPS PWR LEVEL
LEVELS

Summary of Contents for NPD-1 Series

Page 1: ...CCS Technical Documentation NPD 1 Series Transceivers Issue 1 11 2002 Confidential Nokia Corporation Troubleshooting RF ...

Page 2: ...NPD 1 Troubleshooting RF CCS Technical Documentation Page 2 Nokia Corporation Confidential Issue 1 11 2002 ...

Page 3: ...in Comp Cell or PCS Po MD or LO LM ML MH HM or HI 20 TN G_Offset Cell MD 21 TN AMPS PL2 Po Mid or Low LowMid MidLow MidHigh HighMid or High 21 TN AMPS PL3 or 4 5 6 or 7 Po 22 TN PA Gain Cal PCS Po 0 or 1 2 3 4 or 5 22 TN TX IF 11 dBm Set PCS Po 22 TN TX RF AGC PCS Po 0 or 1 or 2 22 TN TX Limiting Po Cell or PCS IS95 Low channel or LowMid MidLow Mid MidHigh HighMid or High channel 23 TN TX Limiting...

Page 4: ...GC PDM values from the phone 49 To load a PRL into the phone 50 To change between Local and Normal modes 50 To add a baseband test tone to the AMPS transmitter 51 APPENDIX B Definitions 52 APPENDIX C Block Diagrams 53 APPENDIX D Descriptions of selected components signaling and architecture 58 Robin N601 Key Features 58 Robin N601 Signaling 58 Batman N701 Key Features 59 Batman N701 Signaling 60 P...

Page 5: ...ng to Tables 1 and 3 and ensure that AGC voltages are correct according to Tables 2 cell AMPS and 4 PCS check the LOs for proper frequency and amplitude ensure power supplies to transmitter have correct voltage as per Table 12 If Receiver is not working properly turn on transmitter in local mode and check turn on receiver with Phoenix inject a signal into the receiver check the RSSI level and AGC ...

Page 6: ...all zeros in tuning file and has passed tuning ensure call box channel is set for a channel in PRL and ensure SID is correct ensure MIN MDN and SID are entered into the phone ensure VCTCXO is centered as described in VCTCXO tuning descrip tion below ensure transmitter and receiver are working properly by checking them in local mode To troubleshoot the antenna circuits refer to document DHK00086 EN...

Page 7: ...CCS Technical Documentation Troubleshooting RF NPD 1 Issue 1 11 2002 Nokia Corporation Confidential Page 7 Figure 1 Eagle PWB bottom general placement ...

Page 8: ...he PLL is unlocked the test will fail Manual Verification Turn on the Cell or PCS receiver to any channel and probe at L701 probing point 39 in Figure 6 using an RF probe connected to a spectrum analyzer tuned to 256 2 MHz If the PLL is locked it will be stable in frequency If it is unlocked you may have to use a wide span to see it since it may be far off frequency Troubleshooting First check tha...

Page 9: ...s to check transmitted power If the covers are removed the voltage on PWR_OUT at probing point 48 in Figure 1 can be mea sured Transmitted power should be greater than 24 dBm PWR_OUT greater than 1 91v which corresponds to the power detector ADC 700 For each of the next three cases TX power should be less than 24 dBm less than 1 91v on PWR_OUT 1 TX_IF_AGC to 80 TX_RF_AGC to 512 PA_AGC to 512 2 TX_...

Page 10: ...ere is 2 7v on VR3 and VR6 and 1 8v on VIO Table 12 and Figure 9 If no problems are found replace Robin ST TX Detector PCS This is one of the phone s self tests which gives either a pass or fail result only The phone transmits at several power levels and checks the ADC value of the power detector The ADC value is measured first for a set of AGC values then each AGC value is changed one at a time t...

Page 11: ...s one of the phone s self tests which gives either a pass or fail result only The VHFPLL is inside the Robin IC The phone checks the VHFPLL s lock detect bit If this bit indicates that the PLL is unlocked the test will fail Manual Verification Turn on the PCS CDMA receiver to any channel and probe at L611 probing point 11a in Figure 5 using an RF probe connected to a spectrum analyzer tuned to 416...

Page 12: ...Verification Use RF Tuning window in Phoenix set mode to self tune and choose this tuning Troubleshooting Check Batman N701 and supporting components SN Cell RX DC Offset I or Q This is one of the phone s self tunings which measures and adjusts the cell band CDMA receiver DC offsets until they are within the limits The DC offset is returned for I or Q Manual Verification Use RF Tuning window in Ph...

Page 13: ...s to use a thermal camera and look for hot spots that are not normally hot and look for the hottest spots A visual inspection can find solder bridges or wrong component rotations A failed component can be found by functional tests of the phone s sub blocks Test TX Start up Amplitude This test turns on the AMPS transmitter PCS transmitter in PCS only phones and checks for the presence of a TX signa...

Page 14: ... not present check power supplies particularly ensure 2 7v on VCTCXO Vcc pin pin 4 of G501 Also check the control pin pin 1 of G501 for a voltage between 0 4 and 2 7 v If the voltages are correct and soldering of all G501 terminals is correct replace G501 If 19 2 MHz tone is present but tone at 1880 MHz is not troubleshoot PCS TX chain as described in the Probing Diagrams section 2 If the carrier ...

Page 15: ...ed as a reference in this tuning Then in the next tuning the carrier suppression delta between center tone and tone that is offset 20 kHz is measured If it passes it is reported in that tuning If not the DC offsets are adjusted until it passes and the passing value is reported The reported result is the power in dBm of the tone that is offset 20 kHz from the carrier as measured on the antenna conn...

Page 16: ...e offset tone Measure the delta between the center and offset tones If the delta is 35 dB or greater the phone passes If less than 35 dB vary the I DC offset on the values line in the RF Tuning window using the below listed values until the mini mum carrier maximum delta is found Leave Q at 0 On the values line you enter I Q The values in decimal are If the minimum is 35 dB or greater the phone pa...

Page 17: ...e following table and measure the TX power levels checking to see that they are within the specified range Change the TX_RF_AGC PDM to 511 Leave the TX_IF_AGC at 0 and the PA_AGC at 218 Measure the output power Subtract this power from the power measured in c in the table above This is the RF_AGC gain delta Leave the PA_AGC and TX_RF_AGC values as is then enter the values listed below for the TX_I...

Page 18: ... Main Mode window and set it to channel 384 Set modulation to IS95 voice Set the TX_IF_AGC PDM to 0 decimal Set the PA AGC PDM to 218 decimal Set the TX RF AGC PDM to 512 decimal Adjust the TX IF AGC PDM so that the transmitted tone at 836 52 MHz measures 11 dBm 0 5 dB on the antenna connector using a spectrum analyzer use 0 as a starting point Make a note of this value as it is needed in other Tr...

Page 19: ...en the TX IF AGC is adjusted so that the output power is 11 dBm The result is a power in dBm A perfect result would be 11 00 dBm Manual Verification See previous tuning Troubleshooting See previous tuning TN TX RF AGC Cell Po 0 or 1 or 2 This tuning characterizes the RF AGC curve by entering PDM values to the RF AGC and measuring the output power The results are TX power readings in dBm of the tra...

Page 20: ... channels and output power is reported G_offset is not adjusted on the other channels as it was on the center channel just the output power is recorded The result is the transmitted power in dBm which should be 8 0 dBm 0 5 dB on the center channel Manual Verification Set the phone to local mode and program it to Cellular or PCS CDMA RX TX mode on channel 384 or 600 for PCS using the Main Mode wind...

Page 21: ...ven channels by adjusting TxdBCtr The channels are Low 991 LowMid 107 MidLow 245 Mid 384 MidHigh 521 HighMid 660 High 799 The algorithm then interpolates between the measured points for frequency compensation The result is measured transmit power in dBm for power level 0 on each of the seven channels Manual Verification Set the phone to local mode and turn on the AMPS transmitter to the channel wh...

Page 22: ...ansmitted power in dBm for each of the six PA AGC PDM settings results labeled 0 through 5 Manual Verification This is the same as described in TN PA Gain Cal Cell Po 0 except the phone is set to transmit in PCS mode on channel 600 The transmit frequency is 1880 MHz Troubleshooting Troubleshoot in the same manner as described in TN PA Gain Cal Cell Po 0 for cell band using the PCS band tables in t...

Page 23: ...mum transmit power The result is a power level in dBm which is the maximum allowed This is done on each of the seven channels Manual Verification Using Phoenix set the phone to local mode then turn on the Cell or PCS transmitter set to each of the channels in the list below Using the RF Tuning window adjust TxdBCtr in the values dialog box until the TX power measured on the RF connector with a spe...

Page 24: ...of the signal which for IS95 is 1 23 MHz The bandwidth used at the offsets is 30 kHz Result is ACPR a power delta in dB Manual Verification Set the phone in local mode and turn on the PCS transmitter set to channel 600 Use the TX Limiting function in the RF Tuning window to set the transmit power to the maximum value within the limits for the TX Limiting tuning Observe the TX signal on the spectru...

Page 25: ...C635 C608 C650 C817 C808 C814 C809 C813 Severely degraded ACPR is detectable just by looking at the shape of the CDMA curve see figure above therefore you can also probe each point in the TX chain to see if ACPR becomes degraded at one point TN PA Detector PCS Po 0 or 1 2 3 4 5 6 or 7 This tuning determines the output voltage of the TX power detector as a function of transmitted RF power The resul...

Page 26: ...leshooting Tables and Diagrams sec tion Cell band TX decoupling capacitors are C653 C633 C649 C648 C619 C817 C810 and C811 TN RX IF AGC RXdBCtr 0 or 1 or 2 This tuning calibrates the RX IF AGC curve since the output power of the IF part of the Batman IC is not a linear function of RX_IF_AGC The tuner injects three known signal power levels into the phone s receiver and for each one the phone s AGC...

Page 27: ... is still necessary to probe to pinpoint the source of the error use the AMPS probing tables TN LNA AMPS or Cell or PCS LowGain or HighGain LO or LM ML MD MH HM HI This tuning records RxdBCtr which is automatically adjusted to produce the same ampli tude on the receiver output no matter what the input is for the receiver with the LNA in highgain mode and again with the LNA in lowgain mode For AMPS...

Page 28: ...arker measures power at only one frequency In most cases probing is done in local mode i e not in a call Situations may arise whereby the troubleshooter may need to probe while in a call however in some cases probing may disturb the circuit so that the call drops Although the tables list power levels for many combinations of AGC values it is generally only necessary to check one combination The ex...

Page 29: ... Associated AGC PDM values and voltages channel 384 Cell or 600 PCS AMPS TX RF AGC TX IF AGC Probed RF power on Balun Out PA AGC RF power on RF con nector PDM value voltage PDM value voltage PDM value voltage typical v typical v dBm typical v dBm 409 0 17 110 0 68 11 2 3 dB 19 0 84 26 5 PLO 409 0 17 92 0 71 13 2 3 dB 123 0 66 25 0 PL3 409 0 17 76 0 74 15 4 3 dB 310 0 34 21 0 PL4 249 0 44 66 0 77 1...

Page 30: ... 6v Vbat on pin 5 and 2 6v on pin 4 Tomcat N603 out TX SAW filter Z604 in 4 Figure 5 Gain 12 16 dB through Tomcat N603 also ensure 3 6v on pin 5 and PD_CELL high as in Table 2 N601 C649 C639 Z604 N801 Vbat TX SAW filter Z604 out cell PA N801 in 5 Figure 5 Loss 2 3 dB through SAW Z604 N603 N801 Vbat Cell PA N801 out cell isolator Z802 in 6 Figure 5 Probing here not recom mended unless necessary bes...

Page 31: ...l 11a Figure 5 you can touch top of plastic to verify pres ence of LO but this won t measure amplitude accurately N601 C612 C613 R607 R605 C632 R606 C618 R609 C629 V602 C637 V601 C630 C631 L611 C638 R604 R601 R602 R613 Table 3 DC probing for Cell AMPS transmitter Item to check Setting DC probing location on board DC Voltage Items to check if voltage incorrect TX RF AGC See Table 1 12 Figure 8 See ...

Page 32: ...ure 5 See Table 1 T603 L609 L610 C624 C647 L666 C646 L667 C660 N602 including check for 3 6v on pins 7 and 9 D400 Hornet N602 out PCS TX SAW filter Z601 in 18a for chan nels 25 599 18b for chan nels 600 1175 both Figure 5 Gain 14 5 17 5 dB through Hornet N602 including ensure 3 6v on pins 7 and 9 ensure PD_PCS high as in Table 5 and check PCS_CTRL as in Table 5 according to the channel used Z601 C...

Page 33: ...8 1 MHz for PCS on channel 600 10E Figure 5 Can probe on top of plastic to check for presence of LO but won t read accurate power Approx 3 dBm Check to see if LO is present If no LO is present check R515 C511 C501 C532 Make sure there is 2 7V at TP 10B If voltage is less than 2 6V then refer to baseband regulator troubleshooting If volt age is 2 7V check G502 at TP 10A with a FET probe Check that ...

Page 34: ...lter select 1 Low for ch 25 599 high for ch 600 1175 30a Figure 5 Low 0v High 2 5v min N601 N605 C650 Filter select 2 High for ch 25 599 low for ch 600 1175 30b Figure 5 Low 0v high 2 5v min N601 N605 C608 PCS_ CTRL Low ch 600 1175 high ch 25 599 52 Figure 5 Low 0v high 1 9v min N601 N602 pin1 PD_PCS High TX on Low TX off 53 Figure 5 High 2 6v min low 0v N601 N603 C611 Table 6 Receiver PDM values ...

Page 35: ...N750 Also ensure BAND_SEL low as in Table 9 Also IF_SEL low for CDMA and high for AMPS as in Table 9 Ensure GAIN_CTL is high if RX power is below the LNA switch point Z751 C755 L752 C757 R764 C753 R768 C756 Cell RX saw Z751 out Alfred N750 mixer in 34 Figure 7 Loss 1 3 dB through SAW filter Z751 N750 R765 C750 R768 C756 L757 C758 UHF LO at 1009 62 MHz in Cell CDMA AMPS for channel 384 10D Figure 7...

Page 36: ...ohms Will measure approx 46 dBm for 52 dBm input and RX AGC PDM 225 Z752 L765 C777 L766 C778 L768 L767 C779 N701 VR5 VR7 VIO Batman N701 out UEM D200 in 40 Figure 6 See Table 6 RSSI most useful N701 VR5 VR7 VIO ensure 1 35v on VREFRF01 as in Table 9 also check RX_IF_AGC as in Table 9 R706 C704 R705 R704 V701 C716 L701 C702 C715 R702 C714 R703 C701 VHF LO at 256 2 MHz 39 Figure 6 N701 C701 C714 R70...

Page 37: ...2 R823 L803 R824 X811 X810 X814 L851 PCS duplexer Z804 out Alfred N750 LNA in 42 Figure 7 Loss 1 3 5 dB through duplexer Z804 Z801 Z805 C752 L751 N750 including check for proper voltages on Alfred signaling as in table 3c Alfred N750 LNA out PCS RX saw Z750 in 43 Figure 7 Gain 12 14 dB for high gain Loss 3 to 5 dB for low gain use AGC status win dow to monitor gain status N750 and supporting compo...

Page 38: ...C power applied if active correct voltage of DC signals otherwise replace Alfred N750 mixer out CDMA RX IF saw Z753 in 46 Figure 6 This point not 50 ohms Will measure approx 14 dBm for 52 dBm input and RX AGC PDM 225 N750 and supporting components Also ensure BAND_SEL low for Cell CDMA and high for PCS as in Table 9 Also IF_SEL low for CDMA as in Table 9 L754 C782 C767 C761 C786 Z753 CDMA RX IF sa...

Page 39: ...01 C701 C714 R703 R702 C715 R704 V701 C716 L701 C702 R705 C706 Table 11 RF probing for Cell CDMA and PCS back end receiver Probing point Probing location on board Probed absolute power dBm or gain loss dB Where to start checking if RF power not correct soldering shorts DC power applied if active correct voltage of DC signals otherwise replace ...

Page 40: ...components Probing location VR1A 4 75 VCTCXO UHF PLL Charge Pump figure 9 VR1B 4 75 Robin Not accessible VR2 2 78 Robin Power Detector figure 9 VR3 2 78 Robin VCTCXO figure 9 VR4 2 78 UHF PLL figure 9 VR5 2 78 Batman figure 9 VR6 2 78 UHF LO Buffer figure 9 VR7 2 78 Batman figure 9 VIO 1 8 Robin UHF PLL figure 9 VRX 2 78 Alfred figure 9 VPLL 2 78 UHF PLL figure 9 VBAT 3 1 4 2 PA figure 9 ...

Page 41: ...ubleshooting RF NPD 1 Issue 1 11 2002 Nokia Corporation Confidential Page 41 Probing Diagrams Figure 5 Probing diagram TX components E 11A 11B D 10E 7 6 5 19B 19A 4 pin6 3 16A 16B 17 2A 2B 18B 18A 22 21 20 32 49 50 30A 30B 52 pin1 53 ...

Page 42: ... 1 Troubleshooting RF CCS Technical Documentation Page 42 Nokia Corporation Confidential Issue 1 11 2002 Figure 6 Probing diagram RX IF components C A 10C B 39 10A F 10B 46 10 57 40 60 47 check both 37 36 ...

Page 43: ...Documentation Troubleshooting RF NPD 1 Issue 1 11 2002 Nokia Corporation Confidential Page 43 Figure 7 Probing diagram RX LNA components Figure 8 Probing diagram BB area 10D 23 9 8 33 42 43 44 55 56 54 34 23 12 14 13 ...

Page 44: ...NPD 1 Troubleshooting RF CCS Technical Documentation Page 44 Nokia Corporation Confidential Issue 1 11 2002 Figure 9 Probing diagram voltage regulators ...

Page 45: ...ential Page 45 Figure 10 Probing diagram power detector APPENDIX A Phoenix Instructions To turn on the PCS or Cell CDMA transmitter Under the RF menu choose main mode which opens the dialog box shown below To turn on the transmitter first turn on the carrier by highlighting RX TX in the sub 48 ...

Page 46: ...field and click Rho ON in the state field Choose Cell or PCS in the band field Under Radio Configuration choose the desired con figuration C2K is an abbreviation for IS2000 Click Execute button To turn on the AMPS transmitter Eventually the method will be to use the RF Main Mode dialog box as shown above choosing AMPS in the Band field However at the moment there is a software prob lem with this m...

Page 47: ... The address will then be displayed in the field in the lower half of the dialog box Use this method to enter in both the AFC Disable and AGC Disable addresses These addresses can be obtained from R D and they can change with software version This is the reason this method is temporary Once both addresses are entered check Periodic Read On then click Stop button Then click the Read button which wi...

Page 48: ...ime in seconds in the delay box This is the delay between applications of the multiple values entered Three seconds is sufficient for all tests to run however in certain cases you may want to increase the delay in order to closely observe the phone s behavior during the tuning Any data returned from the phone is displayed on the status line the box at the bottom which in the figure below says 8 tu...

Page 49: ...you must first load the template file by clicking Load File but ton under the Parameter File field Ensure that the template file used is appropriate for the software version in the phone To read RSSI and AGC PDM values from the phone Open the AGC Status dialog box which follows Click Enable Trace RSSI is the value near the antenna on the receiver side The AGC PDM values are shown beside their resp...

Page 50: ...list so that it is blue then click the Write PRL To Phone button At the bottom of the window a status message will indicate if the file was loaded correctly or not To change between Local and Normal modes To make a call the phone should be in normal mode In normal mode the phone soft ware is running and the phone will search for a pilot To troubleshoot so that you can manually control the phone no...

Page 51: ...ween normal and local modes use the Phone Control dialog box as shown below This setting will be lost if the phone is powered down To add a baseband test tone to the AMPS transmitter To add a baseband test tone to the AMPS transmitter open the Test Tone dialog box as shown below and set the parameters as desired ...

Page 52: ...wer1 power2 It is used to denote differences such as gain or loss Power1 and power2 are in linear units such as W or mW dBm A unit for an absolute power level Formula is 10log power in mW 1 mW LNA Low Noise Amplifier LO Local Oscillator This is a CW signal used to mix signals up or down to a different fre quency PA Power Amplifier PDM Pulse Density Modulation This is used for control signals The d...

Page 53: ...CCS Technical Documentation Troubleshooting RF NPD 1 Issue 1 11 2002 Nokia Corporation Confidential Page 53 APPENDIX C Block Diagrams Figure 11 Transmitter Block Diagram Figure 12 Receiver Block Diagram ...

Page 54: ...NPD 1 Troubleshooting RF CCS Technical Documentation Page 54 Nokia Corporation Confidential Issue 1 11 2002 Figure 13 Synthesizer Block Diagram ...

Page 55: ...22 07 MHz 30 kHz Step PCS 2058 10 2118 05 MHz 50 kHz Step TX Block RX Block TX VHF LO CELL 346 2 MHz PCS 416 2 MHz 0 90 2 1 TX Q TX I RX VHF LO CELL 256 2 MHz PCS 256 2 MHz 0 90 2 1 RX Q RX I TX IF CELL 173 6 MHz PCS 208 1 MHz RXIF CELL 128 1 MHz PCS 128 1 MHz 824 04 848 97 MHz 30 kHz Steps 1850 00 1909 95 MHz 50 kHz Steps PCS CELL 1930 00 1989 95 MHz 50 kHz Steps 869 04 893 97 MHz 30 kHz Steps PC...

Page 56: ...ut RBIAS PLL Q input I input Reset RF_BUS_CLK RF_BUS_DATA RF_BUS_EN1X TX_PA_AGC 1 35V reference voltage RBIAS SSB MIXER TX_IF_AGC_REF MUX 2 gain control gain control 90 o 90 o charge pump phase detector loop divider reference divider VHF VCO REGISTER 5 REGISTER 4 REGISTER 3 REGISTER 2 REGISTER 1 REGISTER 0 SIO interface BIASING BIAS CONTROL TEST MUX 90 o 90 o TEST1 TEST2 FILSEL2 PCSCTRL DEAF_CH_EN...

Page 57: ...CCS Technical Documentation Troubleshooting RF NPD 1 Issue 1 11 2002 Nokia Corporation Confidential Page 57 Figure 17 Detailed Batman Block Diagram ...

Page 58: ...r PA gain control contains op amp as part of power detection circuit has serial interface for control by external digital controller 2 7v and 4 7v for analog functions 1 8v for digital functions Robin N601 Signaling PCS_CTRL 1 channels 25 599 0 channels 600 1175 Output of Robin to Hornet PD_Cell PD_PCS Robin output to Tomcat and Hornet powers down those chips 0 off 1 on FALSE_DET Used by UEM to mo...

Page 59: ...ed line The higher the PDM value the lower the gain TX RF AGC This is a PDM controlled line The higher the PDM value the lower the gain PA AGC This is a PDM controlled line The higher the PDM value the higher the gain PCS TX Split Band Filter Z601 Due to the close separation between RX and TX bands in PCS compared to the width of the RX and TX bands a single filter in PCS is not available that giv...

Page 60: ...ore current in order to improve linearity which decreases Power Added Efficiency Boost Mode is used in CDMA both IS2000 and IS95 both Cell PCS above 21 dBm transmit power Biased directly from battery IREF input to PA from Robin that controls gain of PA LNA Downconverter N750 Key Features Alfred N750 Key Features Front end Receiver chip Contains PCS and Cell band fixed gain LNAs that can be switche...

Page 61: ...CCS Technical Documentation Troubleshooting RF NPD 1 Issue 1 11 2002 Nokia Corporation Confidential Page 61 APPENDIX E AGC Algorithms Figure 19 CDMA Cell and PCS AGC Algorithm ...

Page 62: ...on Page 62 Nokia Corporation Confidential Issue 1 11 2002 Figure 20 AMPS AGC Algorithm 0 10 20 30 40 50 60 70 80 90 10 0 30 20 TOTAL IF AGC PA AGC RF AGC 40 GAIN dB Output Power dBm dBm dBm AMPS AGC 20 30 10 3 4 5 6 7 2 24 12 16 8 AMPS PWR LEVEL LEVELS ...

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