Text preview for : 09-NHM7-TUNING.PDF part of Nokia NHM-7 Service Manual 4 File [part 2/3]
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NHM-7 Troubleshooting and Tuning Instructions
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PAMS Technical Documentation Table of Contents
NHM-7 Troubleshooting and Tuning Instructions
Page No Baseband Troubleshooting Instructions......................................................................... 5 PWB Test Points ..........................................................................................................5 Measurement Points .....................................................................................................6 Troubleshooting steps ............................................................................................... 6 Main troubleshooting tree 1 .........................................................................................7 Main troubleshooting tree 2 .........................................................................................8 Phone dead ...................................................................................................................9 Flash programming fault ............................................................................................10 Flash programming fault 2 .........................................................................................11 Phone jammed 1 .......................................................................................................12 Phone jammed 2 ........................................................................................................13 SIM card fault (insert SIM card) .............................................................................14 Audio fault 1 ..............................................................................................................15 Audio fault 1B, earpiece ............................................................................................16 Audio fault 2 ..............................................................................................................17 Audio fault 3 ..............................................................................................................18 Display fault 1 ............................................................................................................19 Display fault 2 ............................................................................................................20 Display fault 3 ............................................................................................................21 Keypad fault 1 ............................................................................................................22 Keypad fault 2 ............................................................................................................23 Keypad fault 3 ............................................................................................................24 RF Troubleshooting ..................................................................................................... 25 Introduction to RF Troubleshooting ..........................................................................25 RF Key Components ..................................................................................................26 PWB Test Points ........................................................................................................27 Transmitter .................................................................................................................28 General instructions on Troubleshooting ................................................................ 28 Transmitter troubleshooting diagram ........................................................................30 Transmitter troubleshooting 2 - Hagar ......................................................................31 Receiver .....................................................................................................................35 Receiver troubleshooting diagram for GSM900 ........................................................37 Receiver troubleshooting diagram for GSM1800 ......................................................38 lLNA gainstep checking ............................................................................................39 Synthesizer .................................................................................................................40 General instructions for Synthesizer troubleshooting ............................................. 40 Synthesizer troubleshooting diagram ........................................................................41 Synthesizer signals ....................................................................................................42 FM Radio Troubleshooting .......................................................................................44 FM Radio troubleshooting diagram ...........................................................................45 FM Radio sígnals .......................................................................................................46 Quick Guide for Tuning the NHM-7* Phone With Phoenix ....................................... 47 General information ...................................................................................................47 Service Tool Concept for RF Tunings ......................................................................... 48 Receiver tuning ..........................................................................................................49 RX Channel Select Filter Calibration...................................................................... 49 RX Calibration ...........................................................................................................51 ,VVXH 1RNLD &RUSRUDWLRQ 3DJH
NHM-7 Troubleshooting and Tuning Instructions
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RX Band Filter Response Compensation ..................................................................56 RX AM Suppression ..................................................................................................62 Transmitter Tuning ...................................................................................................... 65 TX I/Q Tuning ...........................................................................................................65 TX Power Level Tuning ............................................................................................70 Service Tool Concept For Baseband Tunings.............................................................. 74 Baseband Tuning.......................................................................................................... 75 Energy Management Tuning .....................................................................................75
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MBUSTX FBUSRX MBUSRX FBUSTX SLEEPCLK CBUSDA
DBUSCLK DBUSDA UEMINT PURX MBUS VPP GND
CBUSCLK DBUSENX1 CBUSENX
SLEEPX FMCLK FMCTRLDA FMWREN FMTUNEX FMCTRLCLK FBUSTX FBUSRX EXTRDX
FPS8
FM RADIO
FPS-8 test points are connected to the lines from FPS8 and have 2.7 V logic level. FM RADIO test points are connected to FM radio lines and have 1.8 V logic level. The rest of the test points are connected to the lines between UEM and UPP where the logic level is 1.8 V.
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Measurement Points
VR5 2.78 V VR7 2.78 V VR3 2.78 V
VOUT VDD 2.78 V
VFLASH2 2.78 V VR1B 4.75 V
VDDI 1.8 V SCLK SDA GND XCS XRES
VR1A 4.75 V VR2 2.78 V VR6 2.78 V VR4 2.78 V
VIO 1.8V
VCORE 1.8V VANA 2.78 V
VFLASH1 2.78 V
7URXEOHVKRRWLQJ VWHSV The following hints help to find the problem if the circuitry seems to be faulty. The instructions are divided into following sections: 1. Phone is totally dead 2. Flash programming doesn't work 3. Power doesn`t stay on or the phone is jammed 4. Charging fault 5. Plug in SIM card is out of order (insert SIM card). 6. Audio fault 7. Display is not working 8. Keypad fault The first thing to do is carry out a through visual check of the module. Ensure in particular that: a) there are not any mechanical damages b) soldered joints are OK
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NHM-7 Troubleshooting and Tuning Instructions
Main troubleshooting tree 1
TOP
Phone totally dead
Yes
Phone is dead
No
Flash programming doesn't work
Yes
Flash faults
No
Phone doesn't Yes start up or the phone is jammed
Phone is jammed
No
Charging doesn't work
Yes Charger
No
TOP 2
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Main troubleshooting tree 2
TOP 2
Phone doesn't read SIM card
Yes SIM card
No
Yes Audio faults
Audio faults
No
Display or LED's doesn't work
Yes
Display faults
No
Keypad doesn't work
Yes
Keypad faults
No END
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NHM-7 Troubleshooting and Tuning Instructions
Phone dead
Phone is dead
Phone current is zero ?
Yes
Check X101 solder and VBATT lines
No
Yes Phone current is < 50mA
Yes Is phone flash programing OK ?
Phone is jammed
No
No Flash faults No
Phone current is ~ 54 mA
Yes
Is phone in LOCAL MODE ?
No
Check BSI line Yes X101, C241, R203, C109, R202 Are they OK ?
Change UEM
Yes OK retest
No Repair
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Flash programming fault
Flash faults
The Phone does Yes not set Flashbus TXD line high after the startup.
Measure BSI pulse during Flash programming. Is it OK ?
No
Check BSI line X101, C241, R203, C109, R202
No
Yes
Measure FBUSTX line during Flash programming from testpoint J411 Is it High (1.8V) ?
No
Check R102 If OK > Change UEM
Yes
Change UPP
The Phone does not set Flashbus TXD line low after the line has been high.
Yes
Change UPP
No
Flash faults page 2
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Flash programming fault 2
Flash faults page 2
Yes Wrong manufactor ID and Device ID
Change FLASH
No
Yes Is the phone totally dead ?
Phone is dead
No
Phone doesn't start up or the phone is jammed ?
Yes
Phone is jammed
No
Retest
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Phone jammed 1
Phone is jammed Check VBATT16 VIO, VCORE, FLASH1, VANA, VR3 lines. Are they OK? Yes Check Z260 Z265 C260 C265 BSI / BTEMP lines and VBATT lines Check BSI / BTEMP lines. If OK > UEM regulators are not working Change UEM
No
Measure VIO, VCORE, FLASH1, No VANA, VR3 voltages. Are they OK ?
Yes
Measure 32.6kHz Sleep Clk from testpoint J404 Is it OK ?
No
Measure 32.6kHz Sleep Clk from B200. Is it OK ?
No
Check B200, C209, C210
Yes
Yes Change UEM
Measure No 13MHz RFClk from R420. Is it OK ?
Measure 26MHz RFClk No from C660. Is it OK ?
Check R661, C661, R660, C660 if OK change G660
Yes
Yes
Check R420, C420 if OK change N600
Measure PURX No signal from testpoint J402 Is it high (1.8V)?
Change UEM
Yes Jammed Page 2
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Phone jammed 2
Jammed Page 2
Phone shutdown after 30s
Yes
Measure watchdog No signal CBUSDA from testpoint J414 Is it OK ?
Change UPP
No
Measure DBUSClk 1MHz signal from testpoint J413 Is it OK ?
No
Yes
Read phone info. Is it OK ?
No
Measure FBUSRX No signal during phone info read from testpoint J412 Is it OK ?
Change UEM
Yes
Yes
Measure FBUSTX No signal during phone info read from testpoint J411 Is it OK ?
Change UPP
Yes Change LA5 module Retest Change UEM
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SIM card fault (insert SIM card)
SIM card
Insert SIM card faults
Yes Set phone LOCAL mode Is it OK ?
No
Check BSI line X101, C241, R203, C109, R202. If OK > Change UEM
No
Yes
Check X386
Measure VSIM voltge from X386 Is it 3V ?
No
Check VSIM line,X386, C203, C389. If OK > Change R388. If still wrong VSIM voltage > Change UEM
Yes
Check SIM power UP sequency (Page 35 figure 19) Is it OK ?
No
Check SIM lines. If OK > Change R388. If still fail > Change UEM
Yes Change UPP
END
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NHM-7 Troubleshooting and Tuning Instructions
Audio fault 1
Audio faults
No Is earpiece working?
Try change earpiece. Yes Is it working now ?
Retest
Yes
No 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 L151, C160, R164 and line. If OK > Change UEM
Yes
Measure MICB2 No voltage from XMICP pads (L106) . Is it ~2.2V ?
Check L106, C112, R161, C163, R166, C165, R167 and line. If OK > Change UEM
Yes Audio faults 2 Earpiece 2
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Audio fault 1B, earpiece
Earpiece 2
Connect EXT audio signal 1kHz (sine) (¨200mVpp) in XMICP pads and Ground in XMICN
Measure sine signal from earpiece pads. Is it ~880mVpp ?
No
Measure sine signal from UEM (R156) Is it ~130mVpp ?
Yes
Change UEM.
Yes
No Check R156, C153, C155, R166, R167, C163, R161 and line.
Retest
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Audio fault 2
Audio faults 2
Is microphone working?
No
Try change bottom connector X100. Is it working now ?
Yes Retest
Yes
No Set phone in LOCAL mode. Use Phoenix Audio Test. Set HP IN, EXT OUT, LOOP ON.
Measure MICB1 No voltage from MICP pads. Is it ~2.1V ?
Check L105, C105, C152, C156, R152, C168, C166, C215 and line. If OK > Change UEM
Yes Check C151, R157, C105, C154 and line. If OK > Change UEM
Audio faults 3
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Audio fault 3
Audio faults 3
Is BUZZER working?
No
Measure VBATT voltage from B301. Is it OK?
No
Check VBATT line
Yes
Yes Set phone in LOCAL mode. Use Phoenix Audio Test. Set Buzzer volume ON.
Measure Buzzer Yes control signal from BUZZER (C307). Is it 1kHz pulses ?
Change BUZZER (B301)
No
Check C306, C307, C308 and line. IF OK > Change UEM END
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NHM-7 Troubleshooting and Tuning Instructions
Display fault 1
Display faults
Set phone into local mode. Start Display test with Phenix Try change UI module Yes Is it working now ? Retest
Are the UImodule led's turned on ?
No
No Check X303
Yes
Measure signal from X303 pin. 2. Is it 128 Hz ~3.3Vpp ?
Yes Check X303
No
Check R306 If OK. Measure VBATT from V300 pin. 4 Is it OK?
No
Check R304 and VBATT line
Yes
Check control signal line if OK Change UEM
Measure PWM LED`s No control signal from UEM Is it 128 Hz ~3.8Vpp ?
Check R305, V300, V329 and line
Display faults 2
Yes
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Display fault 2
Display faults 2
Are the display led's turned on ?
No
Yes
Measure signal fromV301 pin. 3. Is it 128 Hz ~3.3Vpp ?
Yes
Check LED`s and line
No
Measure VBATT from V301 pin. 4 It is OK?
No
Check R307 and VBATT line
Yes
Check control signal line. If OK, Change UEM
Measure PWM LED`s No control signal from UEM Is it 128 Hz ~3.8Vpp ?
Check R305, V301, V329 and line
Yes
Display faults 3
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Display fault 3
Display faults 3
Try change UI module Yes Is it working now ? No Does the display start ? No
Retest
Yes
Check X300
Measure VDD (2.78V) and VDDI (1.8V). Is it OK?
No
Check C303 and lines. If OK, Change UEM
Yes
Measure VOUT voltage. Is it ~8.1V?
No
Check C302, X300 and lines.
Yes
Measure XRES, XCS. Is it ~1.8 V?
No
Check X300 and lines. If OK, change UPP
Yes
END
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Keypad fault 1
Keypad faults
No Is the power key working ?
Measure voltage from S300 Is it HIGH ?
No
Check R301, C312, S300 and line. If OK > Change UEM
Yes
Yes
Measure voltage Yes from S300 when power key is pressed. Is it HIGH ?
Chech S300. Is it OK ?
Yes Phone is dead
No
No Change S300
Phone is jammed
Keypad faults 2
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Keypad fault 2
Keypad faults 2 Try change UI module. Yes Is it working now ?
Retest
No Is UI module keys working ?
No
Check X303 Yes
Measure ROW0, ROW1, ROW2, ROW3, No ROW4 lines from X303. Are they ~1.8V ?
Check ROW0 4 Lines, X303. If OK change Z301. If still fail change UPP
Yes
Measure SLEEPX No signal from J403 when key is pressed. Is it ~1.8V?
Check ROW0 4 Lines, X303. If OK change Z301. If still fail change UPP
Yes
When keypad No is pressed, the led's are turned on ?
Check ROW0 4 Lines, X303. If OK change Z301. If still fail change UPP
Yes Keypad faults 3 Display faults
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Keypad fault 3
Keypad faults 3
No Is volume UP key working ?
Measure ROW0 line from S301. Is it ~1.8 V ?
No
Check S301, S302, lines. If OK change Z301. If still FAIL change UPP
Yes
Yes Check S301 and COL1 line. If OK change Z301. If still FAIL change UPP
Measure COL1 from S301 when S301 is pressed Is there 50us pulse ?
No
Yes Change UPP
Is volume DOWN key No working ?
Measure ROW0 line from S302. Is it ~1.8 V ?
No
Check S301, S302, lines. If OK change Z301. If still FAIL change UPP Check S302 and COL4 line. If OK change Z301. If still FAIL change UPP
Yes
Yes
END
Measure COL4 from S302 when S302 is pressed Is there 50us pulse ?
No
Change UPP Yes
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NHM-7 Troubleshooting and Tuning Instructions
RF Troubleshooting
Introduction to RF Troubleshooting
Measurements should be done using spectrum analyzer with highfrequency highimpedance passive probe (LO/reference frequencies and RF power levels) and oscilloscope with a 10:1 probe (DCvoltages and low frequency signals). The RFsection is build around one RFASIC (HAGAR N600). Before changing HAGAR, please check following things: Supply voltages are OK and serial communication coming from baseband to HAGAR. Note: Grounding of the PA module is directly below PA module making it difficult to check or change. Most RF semiconductors are static discharge sensitive! So ESD protection must be taken care of during repair (ground straps and ESD soldering irons). HAGAR and PA are moisture sensitive and must be prebaked prior to soldering. Troubleshooting discrete components (resistors, inductors and capacitors) is done by checking component soldering. Capacitors can be checked for shortening and resistor values using an ohmmeter, but remember incircuit measurements are evaluated with caution. Remember that all measured voltages or RF levels in this document are rough figures. Especially RF levels vary due to different measuring equipment or different probe grounding used . When using RF probe it is good to use metal tweezers to connect probe ground to PWB ground as close to measurement point as possible.
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RF Key Components
EGSM LNA EGSM TX SAW DCS LNA DCS TX balun Dual RX SAW DCS RX SAW Dual coupler Antenna switch EGSM RX SAW Hagar RFIC VCO balun 26MHz XO 4GHz VCO
Antenna pad Dual PA
FM IF filter 2
FM receiver IC
FM IF filter 1 FM diskriminator
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NHM-7 Troubleshooting and Tuning Instructions
PWB Test Points
900 1st SAW out 1800 LNA out 1800 1st SAW out LNA_P LNAB_G 900_RX LNAB_P VR2 900 LNA out VrefRf02 900 antsw tx contr VrefRf01 VR5 RX_I LNA_G 1800 antsw contr 1800_RX 1800 PA ctrl Antenna pad 900 PA ctrl 900 PA bias 1800 PA bias VR4 VR6 RX_Q 26M xo out AFC SLE SCLK
900 PA in
900 Mod out 1800 Mod out 1800 PA in
FMdiscr. IF out 1 IF out 2 13M clock
VR3 4G VCO out SDATA VR7 4G VCO ctrl TX_I_0 FM audio Vtune TX_Q_0 VR1a LCtank1 LCtank2
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Transmitter
General instructions on Troubleshooting Connect test jig to computer with DAU9S cable or to FPS8 Flash Prommer with XCS4 modular cable. Make sure that you have PKD1 dongle connected to computers parallel port. Connect DC power supply to module test jig with FLC2 cable. NOTE: When repairing or tuning transmitter use external DC supply with at least 3A current capability. Set the DC supply voltage to 3.9V and set the jumper connector on test jig to "bypass" position. Connect RFcable to the module test jig (MJS46) RF connector and to measurement equipment or at least 10dB attenuator, otherwise the PA may be damaged. Normally spectrum analyzer is used as measurement equipment. NOTE: Normally Spectrum analyzer maximum input power is +30dBm. It is recommended to use 10dB attenuator on Spectrum analyzer input to prevent damage. Set the phone module to test jig and start Phoenix service sofware. Initialize connection to phone. (use FBUS driver when using DAU9S and COMBOX driver when using FPS8) Select product from the menu: File > Choose product > NHM7 From toolbar set operating mode to "Local". Activate RF controls window from the menu: Maintenance > Tuning > RF Controls From the RF controls window: Select band "GSM900" or "GSM 1800" (Default = "GSM900") Set Active unit to "Tx" (Default = "Rx") Set Operation mode to "Burst" (Default = "Burst") Set Tx data type to "Random" (Default = "All1") Set Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band (Defaults) Set Tx PA mode to "Free" (Default)
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NHM-7 Troubleshooting and Tuning Instructions
Set power level to 5 (Default = 19) on GSM900 or to 0 (Default = 15) on GSM1800
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Transmitter troubleshooting diagram
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Transmitter troubleshooting 2 - Hagar
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Transmitter troubleshooting 3 - PA & Antenna
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NHM-7 Troubleshooting and Tuning Instructions
Transmitter signals
X_I_0, Tx on, Random data, Burst mode
TX_Q_0, Tx on, Random data, Burst mode
900/1800 antsw tx contr, Tx on, Burst mode
0/1800 PA bias, Tx on, Burst mode
900/1800 PA ctrl, Tx on, Burst mode, High power level
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G S MP O W RE F 4 1 . 0 1 0 d B/
d Bm
ATT
40
Tu e Se p 2 5 1 3 : 4 8 : 5 9 2 0 0 1 A_ wr i t e b l a n k B_ dB
REF OFS 11. 0 dB
RB W 100 VBW 100 S WP 2. 0
k Hz k Hz s CE NT E R 897. 400 MH z SPAN 2. 000 MH z
Tx out signal, 900 band, burst mode, channel 37
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NHM-7 Troubleshooting and Tuning Instructions
Receiver
Connect test jig to computer with DAU-9S cable or to FPS-8 Flash Prom mer with XCS-4 modular cable. Make sure that you have PKD-1 dongle connected to computer's parallel port. Connect DC power supply to module test jig with FLC-2 cable. Set the DC supply voltage to 3.9V and set the jumper connector on test jig to "bypass" position. Connect RF-cable to the module test jig (MJS-46) RF connector and to RF signal generator. Set the phone module to test jig and start Phoenix service sofware. Initialize connection to phone. Use FBUS driver when using DAU9S and COMBOX driver when using FPS-8. Choose product from the menu: File -> Choose product -> NPM-9. From toolbar set operating mode to "Local". Activate RF controls window from the menu: Maintenance -> Testing -> RF Controls. From the RF controls window: - Select band "GSM900" or "GSM 1800" (Default = "GSM900") - Set Active unit to "Rx" (Default = "Rx") - Set Operation mode to "Continuous" (Default = "Burst") - Set AGC to "8: FEG ON + 46 dB (Default = "8: FEG ON + 46 dB") - Set Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band (Defaults) Apply 942.46771 MHz (channel 37 + 67.710 kHz offset) or 1842.86771 MHz (channel 700 + 67.710 kHz offset) -90 dBm signal to the RF-con nector (remember to compensate for cable attenuation).
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Measuring with an oscilloscope on "RX_I" or "RX_Q" this picture should be seen on a working GSM900 or GSM1800 receiver:
Signal amplitude is 700 mVpp, DC offset 1.35 V and
Signal amplitude is 700 mVpp, DC offset 1.35 V and frequency 67 kHz. If this signal is not seen, continue to the next page.
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NHM-7 Troubleshooting and Tuning Instructions
Receiver troubleshootingdiagram for GSM900 Receiver troubleshooting diagram for GSM900
Apply 90dBm 942.46771MHz signal from generator to antenna connector
Yes Oscilloscope at RX_I Signal 700mVpp DC offset 1.35V Frequency 67.7kHz
No Change generator level to 50dBm
Yes Spectrumanalyzer 900 LNA out 61 dBm
No Spectrumanalyzer 900 1st SAW out 80 dBm
No Spectrumanalyzer 900_RX 79 dBm
No Check Antenna switch Z500
Yes EGSM RX chain functional
Yes Check dual RX SAW Z520
Yes
No Oscilloscope LNA_G 2.7V LNAB_G 2.7V Oscilloscope VR4 2.7V Check Hagar serial interface Check R501
No Check Baseband
Yes Yes Check Hagar N600 Yes Yes Spectrumanalyzer V500, RFout 57 dBm Check C502
No Oscilloscope V500, RFout 2.7V V500, RFin 0.8 V
No Check V500, L500, R502
Yes Check V500, C501, L502, L503
No Spectrumanalyzer 900 bal out 66 dBm Check Z501, C505, C506, L501
Yes Oscilloscope VR4 2.7V Check Hagar serial interface (burst mode)
No Check Baseband All spectrumanalyzer reading values are measured with 1 kohm passive probe (use tweezers to connect the probe ground to the nearest PWB ground). Reading value is represented without +26 dB compensation.
Yes Spectrumanalyzer 4G VCO out 3769.6MHz 30 dBm (*
No Synthesizer troubleshooting
Yes Check Hagar N600 * Spectrumanalyzer reading with 1 kohm passive probe (right value add +26 dB)
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Receiver troubleshooting diagram for GSM1800 Receiver troubleshooting diagram for GSM1800
Apply 90dBm 1842.86771MHz signal from generator to antenna connector
Yes Oscilloscope at RX_I Signal 700mVpp DC offset 1.35V Frequency 67.7kHz
No Change generator level to 50dBm
Yes Spectrumanalyzer 1800 LNA out 61 dBm
No Spectrumanalyzer 1800 1st SAW out 77 dBm
No Spectrumanalyzer 1800_RX 78 dBm
No Check Antenna switch Z500
Yes GSM1800 RX chain functional
Yes Check dual RX SAW Z520
Yes
No Oscilloscope LNA_P 0V LNAB_P 2.7V Oscilloscope VR4 2.7V Check Hagar serial interface (burst mode)
No Check Baseband
Yes Yes Check Hagar N600 Yes Yes Spectrumanalyzer V550, RFout 58 dBm Check C552
No Oscilloscope V550, RFout 2.6V V550, RFin 0.8 V
No Check V550, R551, L550, R558
Yes Check V550, C551, L552
No Spectrumanalyzer 1800 bal out 66 dBm Check Z551, C555, C556, L551
Yes Oscilloscope VR4 2.7V Check Hagar serial interface (burst mode)
No Check Baseband All spectrumanalyzer reading values are measured with 1 kohm passive probe (use tweezers to connect the probe ground to the nearest PWB ground). Reading value is represented without +26 dB compensation.
Yes Spectrumanalyzer 4G VCO out 3685.6MHz 30 dBm (*
No Synthesizer troubleshooting
Yes Check Hagar N600 * Spectrumanalyzer reading with 1 kohm passive probe (right value add +26 dB)
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lLNA gainstep checking
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Synthesizer
General instructions for Synthesizer troubleshooting Connect test jig to computer with DAU9S cable or to FPS8 Flash Prommerwith XCS4 modular cable. Make sure that you have PKD1 dongle connected to computers parallelport. Connect DC power supply or FPS8 to module test jig with FLC2 cable. Set the DC supply voltage to 3.9V and set the jumper connector on test jig to "bypass" position. Set the phone module to test jig and start Phoenix service sofware. Initialize connection to phone. (use FBUS driver when using DAU9S and COMBOX driver when using FPS8) Select product from the menu: File > Choose product >NHM7 From toolbar set operating mode to "Local". Activate RF controls window from the menu: Maintenance > Tuning > RF Controls From the RF controls window: Select band "GSM900" or "GSM 1800" (Default = "GSM900") Set Active unit to "Rx" (Default = "Rx") Set Operation mode to "Continuous" (Default = "Burst") Set Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band (Defaults)
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Synthesizer troubleshooting diagram
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Synthesizer signals Synthesizer signals
26MHz XO out
13MHz clock
4GHz VCO ctrl 900 RX, channel 124, continuous mode
4GHz VCO ctrl 1800 TX, channel 512, continuous mode
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FM Radio Troubleshooting FM Radio troubleshooting
FM Radio component layout Components L101, C101 and C102 are not shown in picture. Componentsare placed in baseband section.
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FM Radio troubleshooting diagram
Note 1. RF test signal parameters: Amplitude, A, 67.0 dBm Carrier ferquency, fc , 98,000 MHz Deviation, f, 75 kHz Modulating frequency fm , 1,000 kHz (RF generator internal) Note 2. Use 10x probe. Compare measured RF signal level to a known good product.
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FM Radio sígnals
Audio out from PWB test point with FM test signal.
Audio out from test jig connector with FM test signal, volume 100%.
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LC tank 2 with FM test signal.
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NHM-7 Troubleshooting and Tuning Instructions
Quick Guide for Tuning the NHM-7* Phone With Phoenix
General information
RF tuning should be made in the same order as shown in this document. If baseband tuning are needed, they should be made before the RF tunings Avoid unnecessary tuning factory tuning values are always the most accurate ones. Views in this document may change as the service software is developed. Please refer to the Phoenix help files, phone model specific service manual and bulletins for help.
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Service Tool Concept for RF Tunings
All RF tunings must be carried out in MJS-46 Module Jig CPL-4 coupler can only be used for testing, NOT for tuning! Power to MJS-46 should be supplied from an external DC power supply, not FPS-8 prommer Maximum input voltage is 12 VDC, nominal input for RF tunings is +8V DC Remember cable attenuation when setting required RF levels.
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Receiver tuning
RX Channel Select Filter Calibration Extra equipment / external RF signal is not needed. Must be done before other RX calibrations. This function is used to calibrate RX channel select filter in GSM Phones. Rx Channel select filter is tuned only in one band = Single calibration for both bands. · Select Maintenance => Tuning => Rx Channel select filter calibratio
·
Select "Yes" to start tuning with values already saved to the phone
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NHM-7 Troubleshooting and Tuning Instructions · Press "AutoTune" to start the tuning.
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· · ·
Tuning values should be 0...31 Select "Stop" If values shown are within limits, choose "Yes" to save values to the phone save them to phone.
·
Close the "RX Channel Select Filter Calibration " dialog to end tuning
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NHM-7 Troubleshooting and Tuning Instructions
RX Calibration
RF generator needed. This tuning performs RX Calibration Must be done separately on both bands!
· Start RX Calibration at EGSM (GSM900), then do RX Calibration at GSM1800 band. AFC tuning is done while EGSM (GSM900) band RX Calibration is performed. Remember to take jig and cable attenuations into account! Select Maintenance => Tuning => Rx calibration
· · ·
·
When RX Calibration has been started, you can choose the correct band from the drop-down menu. Begin tuning from EGSM 900 band.
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· Press "Start"
PAMS Technical Documentation
·
Select "Default" to start tuning from factory default values => OK
·
Press "Calibrate"
·
Set RF generator to required frequency => OK
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NHM-7 Troubleshooting and Tuning Instructions
·
Tuning values and ADC readings will be shown
Typical values and limits in (GSM900) RX Calibration:
(*60 *60 $)& YDOXH $)& VORSH 566, 566, 566, 566, 566, 566, 566, 566, 566, 7\SLFDO YDOXH /LPLWV
· ·
Choose "Stop" to end tuning If values shown are within limits, choose "Yes" to save values to the phone
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·
Continue tuning from GSM1800. Choose the correct band from the drop-down menu. Press "Start" to continue just like in the EGSM900 Band above.
·
·
When asked, set RF generator to required frequency => OK
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NHM-7 Troubleshooting and Tuning Instructions
Typical values and limits in (GSM1800) RX Calibration:
*60 566, 566, 566, 566, 566, 566, 566, 566, 566, 7\SLFDO YDOXH /LPLWV
· ·
Choose "Stop" to end tuning If values shown are within limits, choose "Yes" to save values to the phone
·
Close the "RX Calibration dialog to end tuning.
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RX Band Filter Response Compensation
RF generator needed. Must be done separately on both bands! Start RX Calibration at EGSM (GSM900), then do RX Calibration at GSM1800 band. NOTE! Remember to do RX calibration before doing Rx Band Filter Response Compensation! Remember to take jig and cable attenuations into account!
· Select Maintenance => Tuning => Rx band filter response compensation
·
Select "Yes" to start tuning with values already saved to the phone
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· Select "Manual tuning"
NHM-7 Troubleshooting and Tuning Instructions
· ·
You will be asked to supply 9 different RF frequencies to the phone Set first required frequency and level => OK
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Set 2nd required frequency and level => OK
·
Set 3rd required frequency and level => OK
·
Set 4th required frequency and level => OK
·
Set 5th required frequency and level => OK
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NHM-7 Troubleshooting and Tuning Instructions
Set 6th required frequency and level => OK
·
Set 7th required frequency and level => OK
·
Set 8th required frequency and level => OK
·
Set 9th required frequency and level => OK
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Typical values and limits in Rx Band Filter Response Compensation EGSM900:
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· ·
Choose "Stop, write to PM area" If values shown are within limits, choose "Yes" to save values to the phone
·
Continue tuning from GSM1800. Choose the correct band from the dropdown menu.
·
Repeat the same steps as for the EGSM900 band above
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NHM-7 Troubleshooting and Tuning Instructions
Typical values and limits in Rx Band Filter Response Compensation GSM1800:
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· ·
If values shown are within limits, save values to the phone Close the "RX Band Filter Response Compensation" dialog to end tuning
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RX AM Suppression
RF generator needed (AM modulation). Must be done separately on both bands! Start RX Calibration at EGSM (GSM900), then do RX Calibration at GSM1800 band.
· · · This dialog performs RX AM Suppression. Remember to take jig and cable attenuations into account! Select Maintenance => Tuning => Rx Am suppression
·
Start => Default settings => OK,
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NHM-7 Troubleshooting and Tuning Instructions
· · ·
Set RF generator to state described in left side window. Press the "Tune" button to perform actual tuning. The new tuning values and RSSI dBm value are updated.
· ·
One "I" and "Q" line values should be 0, other values 0.31 RSSI level should be around -107 dBm
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· ·
If values shown are within limits, Select "Stop" Choose "Yes" to save values to the phone
˛ Continue tuning from GSM1800. Choose the correct band from the drop-down menu.
· · ·
Repeat the same steps as for the EGSM900 band If values shown are within limits, choose "Yes" to save values to the phone Close the "RX AM Suppression" dialog to end tuning
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NHM-7 Troubleshooting and Tuning Instructions
Transmitter Tuning
TX I/Q Tuning
Spectrum analyzer needed. Tx IQ Tuning allows changing the Tx I DC Offset, Tx Q DC Offset, Amplitude difference and Phase difference. Must be done separately on both bands! Start TX I/Q Tuning at EGSM (GSM900), then continue at GSM1800 band. Remember to take jig and cable attenuations into account!
· Select Maintenance => Tuning => Tx_IQTuning
·
Select "Load from product" => Start
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The tuning is done by setting each of the sliders to desired value. The sliders can be changed only when the tuning is ongoing. The order of tuning should be same as the order of the sliders e.g. the Tx I DC Offset is tuned first and Phase difference is tuned last. Use <=, =>, PgUp or PgDn keys
·
·
·
Set spectrum analyzer center frequency to 897.4 MHz, span 200kHZ, RBW and VWB 3kHz and sweeptime to 2 seconds Tune LO leak to minimum with TXI/TXQ DC offset control (f0 on spectrum analyzer screen)
·
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NHM-7 Troubleshooting and Tuning Instructions
Tune wrong sideband to minimum using Amplitude/Phase difference controls (f0+68kHz on spectrum analyzer screen)
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Typical TX Iq Tuning Values and tuning limits GSM 900:
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If values shown are within limits, check the "Save to product" tick box and choose "Stop" save the new values to the product
·
Continue tuning from GSM1800. Choose the correct band from the dropdown menu.
· ·
Repeat the same steps as for the EGSM900 band Set spectrum analyzer center frequency to 1747.8 MHz, span 200kHZ, RBW and VWB 3kHz and sweeptime to 2 seconds
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NHM-7 Troubleshooting and Tuning Instructions
Typical TX IQ Tuning Values and tuning limits GSM1800:
, '& 2IIVHW 4 '& 2IIVHW $PSOLWXGH GLIIHUHQFH 3KDVH GLIIHUHQFH
·
If values shown are within limits, check the "Save to product" tick box and choose "Stop" save the new values to the product Close the "TX I/Q Tuning" dialog to end tuning.
·
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TX Power Level Tuning
Power Meter (or Spectrum analyzer) needed With Tx Power Level Tuning, the coefficients are adjusted for each power level Must be done separately on both bands! Start Power Level tuning at EGSM (GSM900), then continue at GSM1800 band. In EGSM900 band The power level tuning is made for both high and low PA Modes In GSM1800 band only for high PA mode.
· · Maintenance => Tuning => Tx power level tuning Remember to take jig and cable attenuations into account!
·
Select "Start" => "Load from: Permanent memory" => "OK "
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NHM-7 Troubleshooting and Tuning Instructions
Note that TX PA mode is "High" at this point.
Figure 1:
·
The coefficient table lists the power level, coefficient, target dBm and DAC value for each power level. The tuned power level can be chosen by using up and down arrows or mouse. The current power level is shown with inverse colors. The tuning value can be adjusted with "-"and "+" keys Tune base level and power levels 19,15 and 5 to target level Press "calculate coefficients"
· · · · ·
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PAMS Technical Documentation
Change TXPA mode to "low"from the drop down menu. When the PA mode is changed, the previous values are saved in memory and the ones for new mode are shown .
·
Tune power levels 19, 15 and 7 (Levels 5 & 6 are not used, base level tuning not needed) Press "Calculate coefficients"
·
Typical values: EGSM900
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·
If values shown are within limits select "Stop" and check "Save values to phone permanent memory" Select "Yes" to save values to phone
·
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NHM-7 Troubleshooting and Tuning Instructions
Continue tuning from GSM1800. Choose the correct band from the drop-down menu.
· ·
Repeat the same steps as for the EGSM900 band above Note that In GSM1800 band PA mode can not be changed because tuning is only made in "High" mode
Typical values: GSM1800
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·
If values shown are within limits select "Stop" and check "Save values to phone permanent memory" Select "Yes" to save values to phone Close the "TX Power Level Tuning" dialog to end tuning
· ·
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PAMS Technical Documentation
Service Tool Concept For Baseband Tunings
EM calibrations must be carried out in JBV-1 Docking Station. CPL-4 coupler can only be used for testing, NOT for tuning! Power to JBV-1 should be supplied from an external DC power supply, not FPS-8 prommer. Maximum input voltage is 16 V DC, nominal input for tunings is +12V DC.
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NHM-7 Troubleshooting and Tuning Instructions
Baseband Tuning
Energy Management Tuning
External power supply needed. EM Calibration is used for calibrating Battery and Charger settings of the phone. Preparation for EM Calibration:
- Connect DC Cable SCB-3 between JBV-1 and Vin of Phone for Charger calibration. - Connect 12...15 V from Power Supply to JBV-1. - NOTE! Check that connection is F-BUS (doesn't work with M-BUS!). · Select Maintenance => Tuning => Energy Management Calibration
· ·
Energy Management values to be calibrated are checked Select "Read from Phone" to show current values in phone memory and to check that the communication with phone works
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PAMS Technical Documentation
Select "Calibrate" to run selected calibrations
Limits for Energy Management Calibration: If values shown are within limits select "Save To Phone" to save values to
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phone. NOTE! Only values of checked tunings (Battery size, Battery Temperature etc....) will be saved. Close the "Energy Management Calibration" dialog to end tuning.
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NHM-7 Troubleshooting and Tuning Instructions
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