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PAMS Technical Documentation NSE8/9 Series Transceivers
Troubleshooting
Issue 1 07/99
NSE8/9 Troubleshooting
PAMS Technical Documentation
CONTENTS
Abbreviations in fault finding charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baseband Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1. Phone is totally dead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2. Flash programming doesn't work . . . . . . . . . . . . . . . . . . . . . . . . . 4.3. Power doesn't stay on or phone is jammed . . . . . . . . . . . . . . . . 4.4. Display Information: Contact Service . . . . . . . . . . . . . . . . . . . . . . 4.5. The phone doesn't register or phone doesn't make a call . . . . 4.6. Plug in SIM card is out of order . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7.Audio fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.8. Charging Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RF Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PCB Bottom view(GF7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PCB Top view (GF7 + GD7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. GSM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 .General instructions for GSM RX troubleshooting . . . . . . . . . . . . . . . . 2.2 .Path of the received GSM signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3.Fault finding chart for GSM receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. PCN Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 .General instructions for PCN RX troubleshooting . . . . . . . . . . . . . . . . . 3.2 Path of the received PCN signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 Fault finding chart for PCN receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. GSM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 General instructions for GSM TX troubleshooting . . . . . . . . . . . . . . . . . 4.2 Path of the transmitted GSM signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3 Fault finding chart for GSM transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. PCN Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1 General instructions for PCN TX troubleshooting . . . . . . . . . . . . . . . . . . 5.2 Path of the transmitted PCN signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3. Fault finding chart for PCN transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . 6. Synthesizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.1 General instructions for Synthesizer troubleshooting . . . . . . . . . . . . . . . 6.2 13 MHz reference oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3.VHF VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4.UHF VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5.Fault finding chart UHF VCO and 13 MHz ref. oscillator . . . . . . . . . . . 3 4 5 6 11 13 13 17 20 23 25 26 26 27 27 27 28 31 31 31 32 36 36 36 37 38 40 40 41 44 44 44 44 45 46
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Abbreviations in fault finding charts
BB DC ESD f: LO P: PA PCB PLL RF RX T: TX UHF V: VCO VHF Baseband Direct Current Electro Static Dicharge Frequency of signal (measured with Spectrum Analyzer) Local Oscillator Power of signal dB) (measured with Spectrum Analyzer) Power Amplifier Printed Circuit Board Phase Locked Loop Radio Frequency Receiver Time between pulses Transmitter Ultra High Frequency Voltage of signal (measured with oscilloscope) Voltage controlled oscillator Very High Frequency
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Baseband Trouble Shooting
The following hints should facilitate finding the cause of the problem when the circuitry seems to be faulty. This troubleshooting instruction is divided into the following section. 4.1 Phone is totally dead 4.2 Flash programming doesn't work 4.3 Power doesn't stay on or phone is jammed 4.4 Display Information: Contact Service 4.5 The phone doesn't register to the network or phone doesn't make a call 4.6 Plug in SIM card is out of order ( insert SIM card or card rejected). 4.7 Audio fault. 4.8 Charging Fault The first thing to do, is carry out a through visual check of the module. Ensure in particular that: a) b) there is not any mechanical damage (especially battery connector X101, X102) solder joints are OK
NOTE: X201 is a connection that is ONLY present in the production. Therefore it is not applicable for the PAMS repair. Service interface J100 - J105 should be used along with service tools: TDS7 ( Service battery ) MJS13 ( Module repair Jig ) The diagnostics on the following pages assumes that the tranceiver bd. Is placed in the MJS13 jig.
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4.1. Phone is totally dead
This means that the phone doesn't take current at all when the power switch S416 is pressed or when the watchdog disable pin (X201 pin 11) is grounded. Used battery voltage must be higher than 1,9 V. Otherwise the hardware of the switcher V105 and CCONT (N100) will not operate reliable.
Phone is totally dead.
Measure Vb voltage at C115
Measure Vdc_out voltage at Vibra pad E103
Yes
> 1,9 V
Yes
> 3.1V
No No
Failure in VB. Check X101, X102 and Jig or tester
Measure voltage at 2,85v>C117 (Vbb) > 2.7V 2,85V >C102 (VXO) > 2.7V When PWR switch is pressed or WDOGDISABLE is grounded.
Switcher
Voltages OK?
No
Measure "PWRON" voltage at R413 when pwrswitch (S416) is pressed or WDDIS is grounded (R424 connected to gnd).
Yes
Power doesn't stay on.
Yes
Voltage less than 0,5V (Will be low only during powerup of CCONT if power switch is pressed.)
Faulty: PCB N100 circuit 32KHz or RFclk osc. Row0 on MAD Insufficient supply capability of V105 circuit
No
Check R413, V410, S416, R423 N100 Check WDDIS line
Figure 41
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Switcher
Check voltage at C109
No
less than 4,8 V
Switcher feedback somehow faulty check circuitry arround V105, V108, V109
> 3.1 V
Yes
Check L103 and capacitors C111 to C113
No
Check voltage at pin 3 of V105
Measure voltage at V105 pin 15
Yes
< 0,4 V
No Yes
app. 1.25 V
Check L102, V101 and circuitry arround V109
No
Check capacitors C109 to C113 and coil L103
Check feedback circuitry R102, R105, R112 and arround V108. Or replace V105
Figure 42
4.2. Flash programming doesn't work
The flash programming can be done via panel connector X201 or via service interface J100 - J105.
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In production, the first programming is done via panel connector X201. After this, the panel connector is cut away, thus other flash programming must be done via service interface J100 - J105. The main differences between these are: a) FLASH programming voltage is produced different way. b) Signal routings are different. The fault finding diagrams for flash programming are shown in Figure 43, Figure 44 and Figure 45. In flash programming error cases the flash prommer can give some information about a fault. The fault information messages could be: MCU doesn't boot Serial clock line failure Serial data line failure External RAM fault Algorithm file or alias ID don't find MCU flash Vpp error
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Check if fault information from Prommer is one of the following: a) MCU doesn't boot b) serial dataline failure c) serial clock line failure
FLASH Programming doesn't work.
failure is one of the above mentioned?
No
A
Yes
Connect watchdog disable (WDDIS R424 ) to GND.
Check WDDIS line: X201 pin 11 > R424
No
C
C117 (Vbb) is typ 2.8V and C102 (VXO) is typ 2.8V ?
Yes
Line OK?
No
See section "Phone is totally dead".
Yes
Faulty PCB
Master RESET (PURX R303) is "1" (2.8V) after ca. 62ms
No
Yes
Check sleep clock (R118 end towards CCONT ) 32kHz square wave
No
Check sleep clock circuit. R121, R122, R123, R124, C147, C148, C153, B100 and C149
Yes Yes
13MHz clock C301 towards MAD 500mVpp min.
No
Faulty N100 or overloaded PURX line RFC 13MHz 800mV min. V702 collector
B
No
Yes
Check R727, V702, R728, R714, G701
Check R743 & C301
Figure 43
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B
Check that the following lines are OK: FCLK (MBUS) line: J102, X201 pin 3 > C306 FTX (fbus_tx) line: J103, X201 pin 1 > C314 FRX (fbus_rx) line: J104, X201 pin 2 > C305 (value on all should be 100 ohm) Check also pullup and down resistors: R309, R310, R311 GND: J100, X201 pin 7 > GND
OK?
No
Repair or defect PCB
Yes
Check Service tool TDS7 & MJS13 and connections
Check that phone is responding to flash programming tool as shown in fig. 43 to 45
MAD or FLASH faulty.
Figure 44
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A
External RAM fault?
No
ID problem?
Yes
Yes
Check pins of SRAM (D302) Check control lines of SRAM:"MEMC(4:0)"
NO
Check type of FLASH Check soldering of FLASH
No
MCU FLASH Vpp Error
Yes
Unknown fault. Check for noise on communication lines Try phone totally dead.
No
Flashing from X201?
Yes
Check connection from J105 to R307
Voltage at R307 >1.7V & <3.6V during flashing?
No
Check that Vpp is not shorted by R307 or C304. connection from R307 to X201 pin 10 Check Vpp Vbb=2.8V Vpp=12V +/ 5% Noise on MBUS/FBUS lines
No
Voltage at R307 12V +/ 5% during flashing?
Yes
Vpp outside supported range.
Yes
Defect FLASH or flashingSW has wrong version.
Figure 45
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4.3. Power doesn't stay on or phone is jammed
If this kind of fault has come after flash programming, there are most probably open pins in ICs. The soldered joints of ICs: D300 (MAD2Pr1), D301 (FLASH), N100 (CCONT), D302 (SRAM) are useful to check at first. Normally the power will be switched off by CCONT (N100) after 32 seconds, if the watchdog of the CCONT can not be served by software. Check watchdog is updated. Check that PWRON (at R413) is high and that CCONTCSX (J337) toggles. In the normal case there is a short burst of pulses every 8 seconds. The power off function of CCONT can be prevented by connecting a short circuit wire from R424 to ground (Watchdog disabled).
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Power doesn't stay on or phone is jammed
Is C109 voltage <4,2V or >3,1V ?
No
Switcher
Yes
Check that CCONTCSX J337 is pulsing and that PWRON (R413) is high.
Yes
Software is able to run in phone, acknowledging watchdog. If power is switched off after a few seconds, check circuit arround V109.
No
Connect R424 to GND
Power doesn't stay on or phone is jammed in idle or call mode
No call
Check VBB typ 2.8V at C117 and VXO typ 2.8V at C102 and that they are stable
Call
No
Switcher Call Is Vdc_out stable and within limits?
No
Yes
C
Yes
Switcher
N100 circuitry is faulty
Figure 46
The LABEL "C" refers to Figure 43, The Label "Switcher" referes to Figure 42
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4.4. Display Information: Contact Service
This fault means that software is able to run and thus the watchdog of CCONT (N100) can be served. Selftest functions are run when power is switched on and software is started to excute from flash. If any of selftests is failed, contact service information will be shown on display. a) Check Selftest status in WinTesla b) Check that content of EEProm D303 and flash D301 is correct c)
4.5. The phone doesn't register to the network or phone doesn't make a call
If the phone doesn't register to the network or the phone doesn't make a call, the reason could be either the baseband or the RF part. The phone can be set to wanted mode by Wintesla service software and determinate if the fault is in RF or in baseband part (RF interface measurements). The control lines for RF part are supplied both the System Asic (MAD2;D300) and the RFI (Cobba_GJP; N200). MAD2Pr1 handles digital control lines ( like synthena, TxP etc.) and Cobba handles analog control lines (like AFC, TxC etc.). The DSP software is constructed so that operation states of DSP (MAD2Pr1) can be seen in external flag (DSPXF) output pin J308. After power up, DSP signals all completed functions by changing the state of the XF pin (see Figure 47, Figure 48, Figure 49 and Figure 410).
1. DSP initialization done 2.Synchronization to networknetwork Network done 3. Registration to 1 2 3 Network done.
MAD2Pr1 pin D8 (DSPXF) J308
The states of DSP (MAD2) after power on Figure 47
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1
init initialize dsp constants download patch code download
initializatio d none
MAD2Pr1 pin D8 (DSPXF) J308
The states of DSP after power on Figure 48
2
PSW search
last PSW OK synchronizatio O nK
MAD2Pr1 pin D8 (DSPXF) J308
channel scan starts
The states of DSP after power on
Figure 49
3
send RACH RACH OK
go SDCCH imediate OK assigment
MAD2Pr1 pin D8 (DSPXF) J308
The states of DSP after power on
Figure 410
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Phone doesn't register to the network or phone doesn't make a call
Analog supply voltage to COBBA is > 2.7V (C218) and stable ?
No
Check N100
Yes
Analog reference to COBBA is 1.5V (C205) and stable ?
No
Yes
Check R207, C205, C123 and C124. Check Vref and load on it
Check: Supply voltage Vcp (C132) > 4.8V Supply voltage VRX_1 (C101) > 2.7V Supply voltage VRX_2 (C104) > 2.7V Supply voltage VSYN_2 (C103) > 2.7V during the receiving slot Supply voltage VTX (C125) > 2.7V during the transmitting slot
All OK?
No
Yes
Synthesizer lines: SEna1 R724 SClk R722 SData R722 Pulses 0>1 during receiving slot
Check N100, D300 and load in RFon defective lines
All OK ?
No
Check D300
Yes
D
Figure 411
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D
RF control lines: RxC (R725) 0>2.3Vmax during receiving slot AFC (C747) 0 1.2V typ. during receiving slot
OK?
No
Yes
Check N200
Analog data signals: RxIP & RxIN 0>1.5V DC during receiving slot Recieved signal is biased to DC, amplitude 50mVpp nominal and frequency 13MHz
OK?
No
Yes
RF control lines: TxC (C700) 0>2.3Vmax during transmit slot TxP (R706) 0>2.8V (logical signal) during transmit slot
Check N200 if DC fail or RF part
OK?
Yes
No
Analog data signals: TxIN & TxIP (C709) 0>0.8V DC during transmit slot TxQN & TxQP (C708) 0>0.8V DC during transmit slot Transmit signal is biased to DC, amplitude 300mVpp and frequency 64kHz
Check N200 if TxC fail else Check D300
Yes
OK?
No
Check RF part
Check N200
Figure 412
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4.6. Plug in SIM card is out of order ( insert SIM card or card rejected).
The hardware of the SIM interface from MAD2Pr1 (D300) to the SIM connector (X100) can be tested without SIM card. When the power is switched on, all the used lines (VSIM, RST, CLK, DATA) rises up to 3V one time and 5V tree times (see fig 5). Thus "Insert SIM card" faults can be found without SIM card. The fault information "Card rejected" means that ATR message (the first message is always sent from card to phone) is sent from card to phone but the message is somehow corrupted, data signal levels are wrong etc. or factory set values (stored to the EEPROM) are not correct.
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Insert SIM card fault
VSIM (C137), DATA_0 (C140), SIMRST_0 (C139) and SIMCLK_0 (C138) lines rise up to 3V on the first puls and then 5V the next tree pulse after power on with out simcard
Yes
Check soldring and springs on X100
No
SIMIF(4:0) lines SIMPWR (J321), SIMCardData (J325), SIMCardRst (J324), SIMCLK (J323), SIMIOC (J322) rise to 2.8V after power on
Yes
Faulty PCB, N100
No
Faulty D300
Figure 413
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Card rejected fault
VSIM according to spec. 2.8Vmin (3V card) 3,2Vmax 4.5Vmin (5V card) 5,2Vmax
No
Faulty PCB, N100
Yes
ATR data can be seen at C140
No
Yes
Check X100, R115
ATR data can be seen at J325 on D300
No
Check N100
Yes
SIM_IOControl line (J322) on D300 is "1" during ATR message
No
Check D300
Yes
Check N100
Figure 414
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4.7. Audio fault.
Upon disassembly it is wise to check the spring contacts of the audio transducers and bottom connector Uplink and downlink are broken
Voltage on V202 pin 4 (HOOKDET) is 2.8V without external audio devices
No
Check R226, R225, R212, V202
Yes
Voltage on R200 (HEADDET) is 0,65V without external audio devices
No
Yes
Check V200, R200, R202
Frequency at E200 on (N200 PCMSclk) is 8kHz square wave logical level during call
No
Check N200
Yes
Check for uplink and for downlink broken Figure 415
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Uplink is broken
Voltage at C230 is 1.8V Voltage at C231 is 0.3V during call
No
Yes
Check: microphone connections on X503 micbias components (C219, R214, C220,R215, R216)
DCVoltage on COBBA side of C258 & C259 is 1.4V during call
No
Check N200 COBBA
Yes
Audio voltage (few millivolts) on COBBA side of C258 & C259 during call
No
Check C226, C229, R230, R219, R220 MICROPHONE and PCB
Yes
Check N200
Figure 416
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Downlink broken
Voltage on C221 & C222 is 1.4VDC during call
No
Check C221, C222, C223, C224, B201, L202, L203 and N200
Yes
Audio signal on L202 & L203 during call when speaker should emit sound
No
Check L202, L203 B201, N200 & D300
Yes
Is earpiece properly mounted
No
Yes
Repair or new module
Check if springs are damages
Figure 417
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4.8. Charging Fault
Nothing happens when charger is connected
Voltage level at R101 is higher than 0.35V when charger is connected
No
Yes
Check if pcb fuse F100 is blown and check X503, L100,L101 R100,R101 and C146
Check N100, R104,N101,V114 and R137
Figure 418
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Display information: Not charging
Yes
Voltage at C155 is about 0.5V, power on, BTEMP value 47k
No
Check R125, C127, C155 and N100
Yes
Check charg_ctrl 32Hz (fast charger) or 1Hz (slow charger) at R142
No
Check N100 and R142 andR117
Yes
Is voltage the same on both side on switcher? C110 (3.24.1V) and at V101 (2.03.0V)
No
Yes
voltage over R137 when charger is connected ACP7~70mV ACP9~190mV
No
Go to Switcher on fig4.2
Yes
Returning theCharger Calibration with Wintesla
Check N101, R104, R137 V114 and C122
Figure 419
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RF Troubleshooting
Measurements should be done using Spectrum Analyzer with highfrequency 500 ohm passive probe (LO/reference frequencies and RFpower levels) and Oscilloscope with a 10:1 probe (DCvoltages and low frequency signals). RFsection is mainly build from two ASICS CRFU3 (N600) and SUMMA (N700), external filters, MMIC PAmodules (N500, N501) and two synthesizers. For easier troubleshooting, this RF troubleshooting document is divided into five sections: GSM Receiver, GSM Transmitter, PCN Receiver, PCN Transmitter and Synthesizer parts. The tolerance is specified for critical signals/voltages. Before changing either of the ASIC's, please check the following things: The soldering and connections of pins of the ASIC's are OK, supply voltages are OK and the signals of the synthesizers are coming to ASIC's. This will prevent the unnecessary changing of the ASIC's. Please note that the grounding of the PAmodule is directly below PAmodule so it is difficult to check. The PAmodule is static discharge sensitive! So ESD protection must be used when dealing with PAmodule (ground straps and ESD soldering irons). The PA's are class 3 moisture sensitive so parts must be dry bake. There are still a lot of discrete components (resistors, inductors and capacitors) which troubleshooting is done just by checking that component is soldered or it is not missing from PCB.
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PCB Bottom view(GF7)
N500
PA GSM
Z504 PCN Switch
1
Z601
4
L500 Coupler GSM
TX GSM
Z600 TX GSM 116MHz Z702 TX PCN 232MHz Z700
71 MHz SAW
RX GSM
L503 Coupler PCN
Z505 Diplexer
1 25
N600
37
N700
13
1
4
LO Filter 116MHz
SUMMA
13 25 13MHz Filter
Z701
PA PCN
N501
Z501
RX PCN
CRFU3
37
T600 PCN Balun Z602
1 RX 187MHz
G702 OUT Vcc
G700
N502 Z502
TX PCN
4
PCN Buffer
1
Z603
RX PCN
VHF VCO
Vcc
UHF VCO
OUT
TX PCN
PCB Top view (GF7 + GD7)
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2. GSM Receiver
2.1 . General instructions for GSM RX troubleshooting
Start WinTeslaServiceSoftware and Select: Product Band GSM Select: Testing RF Controls RX Continuous Alt+p b g Alt+e r Alt+r
Cont. Mode Ch: 60 Alt+o, 60 Front End On (if Front End is off, Alt+e)
Apply a 947.0 MHz (channel 60) 50 dBm signal to MJS13 RFconnector. This signal is tracked through RXpath and will make the troubleshooting of the RX easier.
2.2 .
Path of the received GSM signal
This path defines the general route of the received signal: Antenna, Diplexer (Z503), Duplexer (Z500), CRFU3 (LNA N600), GSM Filter (Z600), CRFU3 (Mixer N600), SAW 71MHz Filter (Z700), SUMMA (N700), 13Mhz Filter (Z701), SUMMA, COBBA_GJP (N200). The related component number(s) are defined inside (.).
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2.3.
Fault finding chart for GSM receiver
.
Oscilloscope SUMMA N700 pin 41 SUMMA N700 pin 35 CRFU3 N600 pin 8, 47 CRFU3 N600 pin 13, 33 VREF VRX_2 VSYN_2 VRX_1 Vdc = Vdc = Vdc = Vdc = 1.5 Volt 2.8 Volt 2.8 Volt 2.8 Volt
OK
NO
Check BaseBand
YES Spectrum analyser Verify 500 ohm passive probe Measure at Diplexer (Z503) antenna port 947 MHz
Pin = 50 dBm YES Spectrum analyser CRFU3 N600 pin 27 947 MHz
NO
Check Spectrum analyser, probe and signal generator
Pin = 54 dBm
NO
Check Diplexer (Z503) Duplexer (Z500)
YES Spectrum analyser CRFU3 N600 pin 23 947 MHz Check Pout = 35 dBm YES
.
NO
CRFU3 (N600) pin 24, BandSelect pin 28, FraCtrl
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.
Spectrum analyser CRFU3 N600 pin 18,19 947 MHz
NO Pin = 47 dBm
Check GSM Filter (Z600)
YES Spectrum analyser CRFU3 N600 pin 15,16 71 MHz
NO Pout = 23 dBm
Spectrum analyser CRFU3 N600 pin 4 2036 MHz
YES Pin = 8 dBm NO Check UHF Syntheziser YES Spectrum analyser SUMMA N700 pin 37,38 71 MHz Check CRFU3 (N600)
Pin = 37 dBm
NO
Check 71 MHz SAW Filter
YES Spectrum analyser SUMMA N700 pin 30 13 MHz
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Check NO Pout = 3 dBm SUMMA Pin 36, RXC
YES Spectrum analyser SUMMA N700 pin 25 13 MHz
NO Pin = 22 dBm
Check 13 MHz Filter
YES Spectrum analyser SUMMA N700 pin 23, 24 13 MHz
NO Pout = 3 dBm
Check SUMMA
YES Check BaseBand
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3. PCN Receiver
3.1 . General instructions for PCN RX troubleshooting
Start WinTeslaServiceSoftware and Select: Product Band PCN Select: Testing RF Controls RX Continuous Cont. Mode Ch: 700 Front End On Alt+p b p Alt+e r Alt+r Alt+o, 700 (if Front End is off, Alt+e)
Apply an 1842.8 MHz (MID channel) 50 dBm signal to MJS13 RFconnector. This signal is tracked through RXpath and will make the troubleshooting of the RX easier.
3.2 .
Path of the received PCN signal
This path defines the general route of the received signal: Antenna, Diplexer (Z503), TX/RX Switch (Z504), PCN Filter (Z501), CRFU3 (LNA N600), PCN Filter (Z602), CRFU3 (Mixer N600), LC 187 MHz Filter (L604), CRFU3 (Mixer N600), SAW 71MHz Filter (Z700), SUMMA (N700), 13Mhz Filter (Z701), SUMMA, COBBA_GJP (N200). The related component number(s) are defined inside (.).
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3.3 Fault finding chart for PCN receiver
.
Oscilloscope SUMMA N700 pin 41 VREF SUMMA N700 pin 35 VRX_2 CRFU3 N600 pin 8, 47 VSYN_2 CRFU3 N600 pin 13, 33 VRX_1
Vdc = Vdc = Vdc = Vdc =
1.5 Volt 2.8 Volt 2.8 Volt 2.8 Volt
OK
NO
Check BaseBand
YES Spectrum analyser Verify 500 ohm passive probe. Measure at Diplexer (Z503) antenna port 1842.8 MHz Check Spectrum analyser, probe and signal generator
Pin = 50 dBm
NO
YES Spectrum analyser CRFU3 N600 pin 34 1842.8 MHz Check Pin = 53 dBm NO Diplexer (Z503) TX/RX Switch (Z504) PCN Filter (Z501)
YES Spectrum analyser CRFU3 N600 pin 38 1842.8 MHz
Check Pout = 35 dBm NO CRFU3 (N600) pin 24, BandSelect pin 28, FraCtrl
.
YES
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.
Spectrum analyser CRFU3 N600 pin 42,43 1842.8 MHz
Pin = 47 dBm
NO
Check PCN Filter (Z602)
YES Spectrum analyser CRFU3 N600 pin 45,46 187 MHz
Spectrum analyser Pout = 28 dBm NO CRFU3 N600 pin 4 2029.8 MHz
YES Pin = 7 dBm NO Check UHF Syntheziser YES Spectrum analyser CRFU3 N600 pin 11,12 187 MHz Check CRFU3 (N600)
Check Pin = 31 dBm NO 187 MHz Filter
YES Spectrum analyser CRFU3 N600 pin 15,16 71 MHz
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Spectrum analyser Pout = 26 dBm NO CRFU3 N600 pin 9 116 MHz
YES Check Pin = 8 dBm NO VHF Syntheziser YES Spectrum analyser SUMMA N700 pin 37,38 71 MHz Check CRFU3 (N600) L600, L601
Check Pin = 39 dBm NO 71 MHz SAW Filter
YES Spectrum analyser SUMMA N700 pin 30 13 MHz
Pout = 5 dBm
NO
Check SUMMA pin 36, RXC
YES Spectrum analyser SUMMA N700 pin 25 13 MHz
Check Pin = 24 dBm NO 13 MHz Filter
.
YES
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Spectrum analyser SUMMA N700 pin 23, 24 13 MHz
Check NO Pout = 3 dBm SUMMA
YES Check BaseBand
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4. GSM Transmitter
4.1 General instructions for GSM TX troubleshooting
Apply a RFcable to the MJS13 RFconnector to allow the transmitted signal act as normal. RFcable should be connected to measurement equipment or to at least a 10dB attenuator, otherwise the PA may be damaged. Start WinTeslaServiceSoftware and Select: Product Band GSM Select: Testing RF Controls TX Power Level : BASE TX Continous TX Data Type: Random Channel: 60 Apply Alt+p b g Alt+e r Alt+x, b Alt+c Alt+d, r Alt+n, 60 Alt+a
4.2 .
Path of the transmitted GSM signal
This path defines the general route of the transmitted signal: COBBA_GJP (N200), SUMMA(N700), 116 MHz Filter (L703, L704, L708), CRFU3 (Upconverter N600), GSM Filter (Z601), MMIC PA (N500), Directional Coupler (L500), Duplexer (Z500), Diplexer (Z503), Antenna. The related component number(s) are defined inside (.). There is also power detection (V500) and power control circuits inside SUMMA for transmitter power control.
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4.3 .
.
Fault finding chart for GSM transmitter
.
Oscilloscope SUMMA N700 pin 41 VREF SUMMA N700 pin 27, 47 VTX SUMMA N700 pin 32 TXP CRFU3 N600 pin 8, 47 VSYN_2 CRFU3 N600 pin 39 VTX
Vdc = Vdc = Vdc > Vdc = Vdc =
1.5 Volt 2.8 Volt 2.5 Volt 2.8 Volt 2.8 Volt
OK
NO
Check BaseBand
YES Oscilloscope SUMMA N700 pin 1 SUMMA N700 pin 2 SUMMA N700 pin 3 SUMMA N700 pin 4 TXQN TXQP TXIP TXIN Vac = 0.4 Vpp, Vdc = 0.8 V Vac = 0.4 Vpp, Vdc = 0.8 V Vac = 0.4 Vpp, Vdc = 0.8 V Vac = 0.4 Vpp, Vdc = 0.8 V
OK
NO
Check BaseBand
YES Spectrum analyser SUMMA N700 pin 44, 45 116 MHz
Pout = 9 dBm
NO
Check SUMMA VHF Synthesizer
YES Spectrum analyser CRFU3 N600 pin 25, 26 116 MHz
.
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Check Pin = 5 dBm NO 116 MHz LC Filter
YES Spectrum analyser CRFU3 N600 pin 22 902 MHz
Pin = +9 dBm
NO
Spectrum analyser CRFU3 N600 pin 4 2036 MHz
YES Pin = 8 dBm NO Check UHF Synthesizer YES Spectrum analyser GSM PA N500 pin 1 902 MHz Check CRFU3
Pin = 0 dBm
NO
Check GSM Filter (Z601)
YES WinTesla TX_Data Type: Random TX Power Level: 10 Alt+d,r Alt+x,10
Spectrum analyser GSM PA N500 pin 4 902 MHz
.
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Check NO Pout = +21 dBm GSM PA (N500)
YES Spectrum analyser MJS13 RFconnector 902 MHz Check Power Loop Detector (V500) SUMMA N700 pin 31 SUMMA N700 pin 34 TXC
Check NO Pout = +20 dBm Directional Coupler (L500) Duplexer (Z500) Diplexer (Z503)
YES GSM TX OK
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5. PCN Transmitter
5.1 . General instructions for PCN TX troubleshooting
Apply a RFcable to the MJS13 RFconnector to allow the transmitted signal act as normal. RFcable should be connected to measurement equipment or to at least a 10dB attenuator, otherwise the PA may be damaged. Start WinTeslaServiceSoftware and Select: Product Band PCN Select: Testing RF Controls TX Power Level: BASE TX Continous TX Data Type: Random Channel: 700 Apply Alt+p b p Alt+e r Alt+x, b Alt+c Alt+d, r Alt+n, 700 Alt+a
5.2 .
Path of the transmitted PCN signal
This path defines the general route of the transmitted signal: COBBA_GJP (N200), SUMMA (N700), 232 MHz SAW Filter (Z702), CRFU3 (Upconverter N600), PCN Filter (Z603), PCN Buffer (N502), PCN Filter (Z502), MMIC PA (N501), Directional Coupler (L500), TX/RX Switch (Z504), Diplexer (Z503), Antenna. The related component number(s) are defined inside (.). There is also power detection (V500) and power control circuits inside SUMMA for transmitter power control.
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5.3.
.
Fault finding chart for PCN transmitter
Oscilloscope SUMMA N700 pin 41 VREF SUMMA N700 pin 27, 47 VTX SUMMA N700 pin 32 TXP CRFU3 N600 pin 8, 47 VSYN_2 CRFU3 N600 pin 39 VTX
.
Vdc = Vdc = Vdc > Vdc = Vdc =
1.5 Volt 2.8 Volt 2.5 Volt 2.8 Volt 2.8 Volt
Check NO OK BaseBand
YES Oscilloscope SUMMA N700 pin 1 SUMMA N700 pin 2 SUMMA N700 pin 3 SUMMA N700 pin 4 TXQN TXQP TXIP TXIN Vac = 0.4 Vpp, Vdc = 0.8 V Vac = 0.4 Vpp, Vdc = 0.8 V Vac = 0.4 Vpp, Vdc = 0.8 V Vac = 0.4 Vpp, Vdc = 0.8 V
Check NO OK BaseBand
YES Spectrum analyser SUMMA N700 pin 46 232 MHz
Check Pout = 11 dBm NO SUMMA VHF Synthesizer
YES Spectrum analyser CRFU3 N600 pin 35, 37 232 MHz
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Check Pin = 11 dBm NO 232 MHz SAW Filter
YES Spectrum analyser CRFU3 N600 pin 40 1747.8 MHz
Spectrum analyser Pin = 0 dBm NO CRFU3 N600 pin 4 1979.8 MHz
YES Spectrum analyser PCN Buffer N502 pin 1 1747.8 MHz Pin = +6 dBm NO Check UHF Synthesizer YES Check CRFU3
Check NO Pin = 7 dBm PCN Filter (Z603)
YES Spectrum analyser PCN Buffer N502 pin 4 1747.8 MHz
Check Pout = +1 dBm NO PCN Buffer (Z502)
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YES
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Spectrum analyser GSM PA N500 pin 1 1747.8 MHz
NO Pin = 1 dBm
Check PCN Filter (N502)
YES WinTesla TX_Data Type: Random TX Power Level: 10
Alt+d,r Alt+x,10
Spectrum analyser PCN PA N501 pin 4 1747.8 MHz
Pout = +8 dBm
NO
Check PCN PA (N501)
YES Spectrum analyser Diplexer (Z503) Antenna port 1747.8 MHz Check Power Loop Detector (V500) SUMMA N700 pin 28 SUMMA N700 pin 34 TXC
Pout = +8 dBm YES
NO
Check Directional Coupler (L500) TX/RX Switch (Z504) Diplexer (Z503)
PCN TX OK
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6. Synthesizers
There are three oscillators generating the needed frequencies for RFsection. 13 MHz reference oscillator, 464 MHz VHF VCO and UHF VCO. The frequency range for UHF VCO is GSM TX: 2012.4 ... 2061.6 MHz, PCN TX: 1942.2 ... 2016.8 MHz, GSM RX: 2012.4 ... 2061.6 MHz, PCN RX: 1992.2 ... 2066.8 MHz.
6.1 .
General instructions for Synthesizer troubleshooting
Start WinTeslaServiceSoftware and Select: Product Band GSM Select: Testing RF Controls RX Continuous Alt+p b g Alt+e r Alt+r
Cont. Mode Ch: 60 Alt+o, 60
6.2 ..
13 MHz reference oscillator
The 13 MHz oscillator (G701) is controlled by COBBA_GJP (N200). This 13 MHz signal is pulseshaped and connected to SUMMA (N700) and it is also buffered, filtered and connected to MAD2 (D300).
6.3. VHF VCO
The 464 MHz VHF VCO (G702) signal is used to generate the 116 MHz and 232 MHz signals inside SUMMA. The 116 MHz signal is used in GSM transmitter and in PCN receiver. The 232 MHz signal is used in PCN transmitter.
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Fault finding table for VHF VCO
The fault finding is as described for UHF VCO with following exceptions:
UHF VCO 1 2 3 4 SUMMA N700 pin 21 UHF VCO G700 SUMMA UHF PLL UHF VCO G700 OUTpin changed to changed to changed to changed to VHF VCO SUMMA N700 pin 12 VHF VCO G702 SUMMA VHF PLL VHF VCO G702 OUTpin Pout > 3 dBm Vdc = 1.8 ... 3.0 Volt
The exceptions will be inside (.) in the fault finding chart for the UHF VCO.
6.4. UHF VCO
UHF VCO (G700) is used to generate the first injection for RX (GSM 2012.4 ... 2061.6 MHz, PCN 1992.2 ... 2066.8 MHz) and the final injection for TX (GSM 2012.4 ... 2061.6 MHz, PCN 1942.2 ... 2016.8 MHz). The output frequency of the module depends on the DCcontrol voltage coming from SUMMA.
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6.5.
.
Fault finding chart UHF VCO and 13 MHz ref. oscillator
Oscilloscope SUMMA N700 pin 21 (12) Vdc = 1.8 ... 3.0 Volt
YES OK
NO Oscilloscope SUMMA N700 pin 15
Vac = >2 Vpp, 13 MHz NO Oscilloscope VCTCXO G701 OUT pin Vdc = 1.4 Volt
YES
VCTCXO G701 is OK
Check Vac = app. 1 Vpp, 13 MHz NO Oscilloscope VCTCXO G701 VCCpin YES Pulseshaper D700
Check Vdc = 2.8 Volt YES VCTCXO G701
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NO
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Check BaseBand
Oscilloscope SUMMA N700 pin 41 VREF SUMMA N700 pin 13, 22 VCP SUMMA N700 pin 9, 16, 19 VSYN_2 UHF VCO G700 VCCpin VSYN_2
Vdc = Vdc > Vdc = Vdc =
1.5 Volt 4.0 Volt 2.8 Volt 2.7 Volt
Check NO OK BaseBand
YES
WinTesla RX Burst Mode
Oscilloscope
=
SUMMA N700 pin 5 SUMMA N700 pin 6 SUMMA N700 pin 7
= =
Synthesizer clock Synthesizer data Synthesizer enable
Check OK NO BaseBand
YES
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Spectrum analyser C608 2036 MHz
Spectrum analyser SUMMA pin 8 464 MHz
Check NO VHF VCO G702 Pout > 10 dBm
.
YES Check Pout > 10 dBm NO UHF VCO G700
YES
Spectrum analyser SUMMA N700 pin 18 1018 MHz
YES Pin > 10 dBm
UHF (VHF) Synthesizer seems to be OK Check discrete components
NO Check CRFU3
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