Nokia NSW-6, 8860 Troubleshooting Instruction

PAMS Technical Documentation
NSW-6 Series Transceivers
Disassembly &
Troubleshooting
Issue 1 12/99  Nokia Mobile Phones Ltd.
NSW-6 Disassembly & Troubleshooting

AMENDMENT RECORD SHEET

PAMS Technical Documentation
Amendment Number
Date Inserted By Comments
12/99 OJuntune New disassembly
Nokia Mobile Phones Ltd.
Issue 1 12/99
PAMS Technical Documentation
Disassembly & Troubleshooting
CONTENTS
Disassembly 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baseband Testing 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alignments 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trouble Shooting 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phone is totally dead 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash programming doesn’t work 14. . . . . . . . . . . . . . . . . . . . . . .
Power doesn’t stay on or the Phone is jammed 15. . . . . . . . . . .
The phone doesn’t register to the network or
phone doesn’t make a call 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging failure 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Troubleshooting 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Page No
Introduction 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Abbreviations used 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interface signals between RF and BB/DSP 21. . . . . . . . . . . . . . .
Receiver 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General instructions for RX troubleshooting 25. . . . . . . . . . . . . .
Path of the received signal 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPS RX 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA800RX 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA 1900RX 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Instructions for TX Troubleshooting 32. . . . . . . . . . .
Path of the transmitted signal 34. . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting diagrams for TX 35. . . . . . . . . . . . . . . . . . . . . . .
AMPS TX 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA800 TX 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA1900 TX 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power control loop 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synthesizers 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19.44 MHz Reference oscillator 41. . . . . . . . . . . . . . . . . . . . . .
58.32 MHz Triple Multiplier 41. . . . . . . . . . . . . . . . . . . . . . . . . .
19.44 MHz oscillator 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VHF VCO 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPS& TDMA800 UHF SYNTHESIZER 45. . . . . . . . . . . . . .
TDMA1900 UHF SYNTHESIZER 46. . . . . . . . . . . . . . . . . . . . .
RF ASIC DATA 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Info 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EROTUS ASIC 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RX Front ends N701 and N721 47. . . . . . . . . . . . . . . . . . . . . .
Power Amplifiers N903 & N960 48. . . . . . . . . . . . . . . . . . . . . .
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NSW-6 Disassembly & Troubleshooting
PENTA regulator N702 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA1900 UPCONVERTER N980 49. . . . . . . . . . . . . . . . . . .
TDMA1900 PLL–circuit N870 50. . . . . . . . . . . . . . . . . . . . . . . .
Warranty transfer 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAMS Technical Documentation
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Disassembly

1. Remove battery
NSW-6
Disassembly & Troubleshooting
2. Remove the antenna cover by using the ART–5 antenna removal tool. Place the ART–5 flat side down in the battery recess of the phone in the top left hand corner. The extruding ”finger” slides in the hole next to the battery springs and when pushing the tool the antenna is released for re­moval
3.Remove slide: open it halfway down, and with the left side first, remove it by flipping it over its axle.
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4.Remove A–cover screws (2 pcs)
PAMS Technical Documentation
5. Turn the phone over and remove C–cover screws (3 pcs)
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Snap
6.Release C–cover snaps
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Disassembly & Troubleshooting
Snap
7. Open covers
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PAMS Technical Documentation
8. Remove shield screws (2 pcs)
9. Remove shield
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NSW-6
Disassembly & Troubleshooting
10. Remove main PCB
11. Remove slide frame, UI PCB follows
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PAMS Technical Documentation
12. Now parts can be separated from the cover.
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PAMS Technical Documentation

Baseband Testing

The MCU software enters a local mode at start-up if suitable resistors are connected to the BTEMP and BSI lines.
NOTE! Baseband doesn’t wake up automatically when the battery voltage is connected. Power must be switched on via:
1. Pwr key or
2. BTEMP line or
3. Charger
4. Connecting J150 to ground
Alignments
NSW-6
Disassembly & Troubleshooting
Within alignment those parameters are adjusted, that cannot be set accu­rate enough by design, because of component tolerances.
Due to use of 5% resistor values, the channels of the CCONT A/D con­verters need to be aligned in the production phase.
Within battery voltage tuning VBAT the MCU software reads the A/D read­ing from CCONT at 4.1 V and stores this reading to EEPROM (emulated by Flash) memory as a reference point. Then second reading is done at
3.1 V. Now the slope is known and A/D readings can be calibrated. Ca­libration is included in VBAT A/D reading task.
Battery charging voltage VCHAR and current ICHAR are calibrated using one test setting. Test jig in production line must have a connection to bat­tery terminals. ICHAR is adjusted to 500 mA and VCHAR to 8.4 V with appropriate load connected to the battery terminals.
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Trouble Shooting

The following hints should facility finding the cause of the problem when the circuitry seems to be faulty. This trouble shooting instruction is di­vided following section.
1. Phone is totally dead
2. Flash programming does not work
3. Power does not stay on or the phone is jammed
4. Display information: Contact Service
5. Phone does not register to the network or phone does not make a call.
6. Audio fault.
7. Charging fault The first thing to do is carry out a through visual check of the module. En-
sure in particular that: a) there are not any mechanical damages
b) soldered joints are OK
PAMS Technical Documentation
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PAMS Technical Documentation

Phone is totally dead

This means that phone doesn’t take current at all when the power switch is pressed or when the watchdog disable pin (X101 pin 11 or J150) is grounded. Used battery voltage must be higher than 3.0 V. Otherwise the hardware of CCONT (N150) prevents totally switching power on. Here the VBat is set to 3.6V
Phone is totally dead
YES
NO
VBat=3.6V at R153
YES
NSW-6
Disassembly & Troubleshooting
Failure in VBat line, check X100
Voltage at J150 of CCONT (N150) = 3.6V
YES
C166 (VBB) = 2.8V C158 (VR1) = 2.8V when PWR switch pressed or watchdog disable pin grounded
YES
See section: Power does not stay on
NO
Faulty circuit N150
NO
CCONT(N150) J150 = 0V when PWR switch pressed or watchdog disable pin (X101 pin 1 1) grounded
YES
Faulty circuit N160
NO
Check R160, PWR switch, connector X300 Check watchdog disable line X101
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Flash programming doesn’t work
The flash programming is carried out via the pads accessible from the back of the phone (using service accessories).
Flash programming doesn’t work
YES
PAMS Technical Documentation
VBAT > 3.0 V VBB (C166) 2.8 V VR1 (C158) 2.8 V
YES
PURX (J140) master reset=”1”(2.8V)
FLASH (D201) VBB is 2.8V (C203),
SRAM (D200) VBB is 2.8 V (C200), FLASH VPP is > 2.8 V (C202)
YES
RFC (J250) 19.44 MHz sine wave
Clock signal: 700mV Vpp typ.
COBBACLK (J210) 9.72MHz sq.wave
clock signal 2.80 Vpp
OK
Check the following lines: FBUSTXD line: J114–>MAD1
FBUSRXD line: J113–>MAD1 M2BUS line: J112 to MAD1
Check also pullup and pulldown resistors R209, R210, R212
NO
See section ”Phone is totally dead”
NO
Sleep clock SLCLK (J157)
square wave 32 kHZ
Faulty circuit N150
or over loaded PurX line
NO
YESYES
check
VCXO G850
NO
Check sleepclock circuitry
C154, C155, C190
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OK
Check control lines of SRAM and FLASH: e.g. there is voltage spikes when trying to write
and read something to SRAM and FLASH
RAMSelX (J207), RPMSelX (J208)
MCURDX and MCUWRX (X200 pins 19 and 18)
OK
There could be open pins in circuits D200, D201, D202 (open joints may be detectable with microscope). If not the PCB or D202, D200, D201, N150 is faulty
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Disassembly & Troubleshooting
Power doesn’t stay on or the Phone is jammed
If this kind of fault has come after flash programming, there are most probably open pins in ICs. The solder joints of ICs: MAD1 (D202), Flash (D201) and SRAM (D200) are to be checked at the extent possible (by microscope from the side of PCB and lightly pressing components while switching power on).
Normally the power will be switched off by CCONT (N150) after 32 sec­onds, if the watch-dog of the CCONT can not be served by software. The watch-dog updating can be seen by oscilloscope at J154 (DataselX) of CCONT. In normal case there is a short pulse from ”1” –> 0 every 8 sec­onds. The power off function of CCONT can be prevented by connecting a short circuit wire from WDDISX (CCONT E4 (J150)) to ground (J151).
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Power doesn’t stay on or phone is jammed
YES
CCONT (N150) watchdog is served?
J154 pulses 1 –> 0)
Connect short circuit wire from
Watchdog J150 to ground J151
OK
FLASH (D201) VBB is 2.8V (C203)
YES
PURX (J152) master reset = ”1” (2.8 V)
YES
RFC (J255) 19.44 MHz sine wave
Clock signal: 700 mV Vpp typ.
COBBACLK (J210) 9.72 MHz square wave
clock signal 2.80 Vpp
YES
YES
NO
NO
NO
Software is able to run
If power is switched off
after few seconds, check
BSI (X100 to C167) and
BTEMP (X100 to C168) lines
YES
VBAT is OK =
3.8V
Sleep clock SLCLK
square wave 32 kHz
YES
Faulty circuit N150
or over loaded PURX line
Check VCXO G850
N150 is faulty
NO
check sleep clock circuitry
(B150, R157...)
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Open pins or faulty circuit:
D202, D200, D201, N150
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NSW-6 Disassembly & Troubleshooting
PAMS Technical Documentation
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 (MAD D202) and the RFI (Cobba N250). MAD handles digital control lines and Cobba handles analog control lines.
Diagram is on the next page.
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PAMS Technical Documentation
Phone doesn’t register to the network
or phone doesn’t make a call
YES
Analog supply voltage VR6 is > 2.7 V of
Cobba (N250) at C275
YES
Analog reference voltage Vref is 1.5
of Cobba (N250) at C169
YES
RX: VR1 (C158), VR2 (C159), VR3 (C160), VR4 (C161),
VR5 (C162), VR8 (N702 pin 14), VR9 (N702 pin 13),
TX: VR3 (C160), VR7 (C164), VR7_bias (R901),
Check supply voltages for RF:
VR10 (N702 pin 12) and V5V (C176)
VR11 (N702 pin 11), VR12 (N702 pin 9) and TXPWR3 (C903)
YES
NO
NO
Check N250
Check R256
NO
NSW-6
Disassembly & Troubleshooting
Check CCONT N150 MAD D202
Synthesizer lines: SENA2 (N880 pin 13)
SCLK (N880 pin 11)
SDATA (N880 pin 12) pulses 0 –> 1 during off burst
YES
AGC1 (R758) 0 –> 2.3V max. during receiving burst AFC (R850) 0 –> 1.2V typ. During receiving burst
YES
Digital data signal IF2AN (R789) –>0.6Vpp, 0–>2.2V DC
Digital data signal IF2AP (R788) –>0.6Vpp, 0–>2.2V DC
Digital data signal IF2DN (C750) –>170 mVpp typ, 0–>2.7V DC Digital data signal IF2DP (C751) –>170 mVpp typ, 0–>2.7V DC
Frequency is 450MHz
YES
DAX signal (J211) pulses1–>0 during receiving slot
YES
TX control lines:
TXC (N750 pin 1, R752) 0 –> 2.3 Vmax during transmit burst
TXA (N750 pin 2, R751) goes 0–>1 (2.8 V) during modulation
TXLX1 (R934 pin 1) and TXLX2 (R934 pin 2) 0–> 1 (2.8 V)
YES
Analog data signals : TXIN 0–>0.8V DC during transmit slot
TXIP 0–>0.8V DC during transmit slot TXQN 0–>0.8V DC during transmit slot TXQP 0–>0.8V DC during transmit slot
Used
max, frequency is 12 kHz max
NO
MAD
D202
NO
NO
COBBA N250
Check COBBA N250 if DC fails
NO
Check RF–part if analog signal fails
Check N250
Check COBBA N250 if TXC fails
NO
Check MAD D202 if TXA fails
NO
Check N250
Check
YES
RF–part
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Charging failure

Nothing happens when charger is connected
Voltage level at VCHAR–pin of CCONT is higher than 0.17 V
when charger is connected
Check N150
Display Information: Not charging
YES
YES
YES
PAMS Technical Documentation
NO
Check X102, R158, R160,
F150
Voltage level at C165 is about 0.8 V when
power is connected BSI resistor value should be 18 k
YES
Voltage level at C168 is about 0.5 V when
power is connected BTEMP resistor value
should be 47 k
YES
32 Hz square wave frequency at R150 if ACP–9U
charger is connected, 1 Hz square wave frequency if
ACP–7U or ACP–8 is connected
YES
Voltage levels at R153 are same as VBAT (C180)
YES
Voltage levels at R153 rises when
charger is connected
NO
NO
NO
NO
NO
Faulty N151
Check
R158, R163
Check
R163, R161
Check N150
Check
R153, N151
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PAMS Technical Documentation

RF Troubleshooting

Introduction

Measurements are done using a spectrum analyzer and a high–frequen­cy probe (Local and reference frequencies and RF–power levels in inter­mediate stages of TX/RX–chains). An oscilloscope is used to measure DC–voltages and low frequency signals. A multimeter is also a useful measurement instrument in fault finding.
An external RF connector is assembled only on R&D– and calibration panels for FLALI improving reliability of the measurement results, and it should be in use when it is possible. Later on soldering pads for this con­nector will be removed from the layout, therefore a connector to the an­tenna pad needs to be soldered manually.
NSW-6
Disassembly & Troubleshooting
The RF section is mainly built around EROTUS–IC (N700). The RF block has separate external filters, UHF synthesizers, Power Amplifiers, TX Driver amplifiers, LNA/Mixer and upconverter circuit for both frequency bands. In TDMA1900 mode a RF regulator IC is provided to supply volt­age for RF parts.
To simplify troubleshooting, this RF troubleshooting document is divided into three bigger sections: Receiver–, Transmitter– and Synthesizer blocks. The tolerances are specified for critical signals/voltages.
Before changing single ASICS or components, please check the following things:
1. The soldering and connections of pins of ASICS
2. That supply voltages and control signals are OK
3. Signals from the synthesizers are coming to ASICS. This will prevent unnecessary changing of ASICS.
Please note that the grounding of the Power Amplifier–IC is directly un­derneath, so it is difficult to check. The PA is ESD sensitive! So ESD precaution must be used when dealing with the PA–IC (ground straps and ESD soldering irons). The PAs are also moisture sensitive components, and it is important to follow additional information about handling the com­ponents.
There are also lots of discrete components (resistors, inductors and ca­pacitors) the troubleshooting of which is done just by checking that com­ponent is soldered or that it is not missing from the PCB.
AAX-1 tool is used to provide galvanic contact for RF measurements, kindly refer to the figure on the next page.
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AAX-1
PAMS Technical Documentation
NSW–6
Abbreviations used
BB Baseband f Frequency of signal (measured with spectrum analyzer) IF Intermediate Frequency LO Local Oscillator P Power of signal in decibels compared to a milliwatt (dBm)
(measured with spectrum analyzer) PA Power Amplifier PCB Printed Circuit Board PLL Phase Locked Loop RF Radio Frequency RX Receiver T Time (between pulses) TX Transmitter UHF Ultra High Frequency
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V Voltage of signal (measured with oscilloscope) VCO Voltage controlled oscillator VHF Very High Frequency AF Audio Frequency
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Disassembly & Troubleshooting

Interface signals between RF and BB/DSP

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Signal
name
VBAT Battery RF Voltage 3.1 3.6 5.3 V Supply voltage
VREF CCONT EROTUS Voltage 1.478 1.500 1.523 V Reference volt-
RFTEMP RF CCONT Voltage 0
AFC COB-
AGC1 Cobba_D EROTUS Voltage 0.5 1.4 V Gain control for
AGC2 MAD RX LNA Voltage 0 2.85 V LNA Gain switch
PD1 EROTUS VHF VCO Voltage 0
PD2 EROTUS 1GHz
From To Parameter Min Typ Max Unit Function
for RF and regu­lators
age for EROTUS
BA_D
1.4
HOT
VCTCXO Voltage 0.05 1.1 2.25 V Automatic fre-
1.0
2.8
Voltage 1.3 3.5 V 1 GHz
UHF VCO
ROO
M
TEMP
1.5
3.3
2.7
COLD
4.0
2.0
3.8
V RF temperature
sensor 47k NTC to GND
quency control
EROTUS RX AGC
“1” min 2.0 V “0” max 0.7 V
V
V V
VCO control voltage
322.38 MHz
392.46 MHz
MODE MAD 1Ghz P A
bias switch
IF2AP/ IF2AN
IF2DP / IF2DN
SENA1 MAD EROTUS Logic high ”1” 2.0 2.85 V 1 Ghz PLL en-
SDATA MAD EROTUS Logic high ”1” 2.0 2.85 V Synthesizer data
SCLK MAD EROTUS Logic high ”1” 2.0 2.85 V Synthesizer
EROTUS COB-
BA_D
EROTUS COB-
BA_D
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Voltage 0 2.85 V “0” AMPS
“1” TDMA
Voltage/Fre­quency
Voltage/Fre­quency
Logic low ”0” 0 0.8 V
Logic low ”0” 0 0.8 V
0.6 / 450
170 /
450
Vpp / kHz
1400 mVpp
/ kHz
Differential limit­er output to DEMO–FM de­modulator
Differential IF2–signal to RX A/D–converter
able
clock
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NSW-6 Disassembly & Troubleshooting
name
PAMS Technical Documentation
FunctionUnitMaxTypMinParameterToFromSignal
Logic low ”0” 0 0.8 V
RFC EROTUS COB-
BA_D
RFCEN MAD CCONT /
PENTA regulator
RSSI EROTUS CCONT/
COB­BA_D
TXIP/ TXIN
TXQP/ TXQN
TXP1 MAD CCont Logic high ”1” 2.0 V 1 Ghz Transmit-
COBBA EROTUS Differential
COBBA EROTUS Same as
Voltage/Fre­quency
Voltage 0 2.85 V “1” min 2.0 V
Output level 0.1 1.5 V Analog mode
voltage swing (static)
Single ended output level
TXIP/TXIN
Logic low ”0” 0.5 V VR7 ON/OFF
0.2 0.4 /
19.44
1.022 1.1 1.18 Vpp Differential in–
0.760 0.8 0.84 V
1.0 Vpp / MHz
Clock signal for the logic circuits
“0” max 0.4 V
field strength in­dicator
phase TX base­band signal for the RF modula­tor
Differential quad­rature phase TX baseband signal for the RF modu­lator
ter enable
TXC COBBA EROTUS Number of
bits
Output volt­age swing
Minimum code output level
Maximum code output level
TXF EROTUS MAD Voltage 0 2.85 V False transmis-
TXP2 MAD PENTA
regulator
TXA MAD EROTUS Logic high ”1” 2.5 V PWR control
Logic high ”1” 2.0 V 2 Ghz Transmit-
Logic low ”0” 0.5 V VR11 ON/OFF
10 bits Transmitter pow-
er control (ramps & power levels)
2.09 2.15 2.21 V
0.12 0.15 0.18 V
2.27 2.3 2.33 V
sion indicator, function con­trolled via ERO­TUS register
ter enable
loop during TX burst (slow mode)
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PAMS Technical Documentation
name
Logic low ”0” 0.2 V PWR control
TXLX1 MAD TX 800 Logic high ”1” 2.1 2.85 V Low power level
Logic low ”0” 0 0.6 V High power level
TXLX2 MAD TX 1900 Logic high ”1” 2.1 2.85 V Low power level
Logic low ”0” 0 0.6 V High power de-
Disassembly & Troubleshooting
FunctionUnitMaxTypMinParameterToFromSignal
loop during ramp up/down (fast mode)
mode for power detector
mode for power detector
mode for power detector
tector mode power detector
SENA2 MAD 2 Ghz
UHF PLL
RXPWR1 MAD CCONT Logic high ”1” 2.0 V VR4 ON
RXPWR2 MAD PENTA Logic high ”1” 2.0 V VR8 ON, 1Ghz
RXPWR3 MAD PENTA Logic high ”1” 2.0 V VR9 ON 2Ghz
SPWR1 COB-
BA_D
SPWR2 COB-
BA_D
CCONT Logic high ”1” 2.0 V VR2 ON , 1Ghz
CCONT Logic high ”1” 2.0 V VR3 ON, VHF
Logic high ”1” 2.0 2.85 V 2 Ghz PLL en-
able
Logic low ”0” 0 0.8 V
Logic low ”0” 0 0.8 V VR4 OFF
frontend
Logic low ”0” 0 0.8 V VR8 OFF
frontend
Logic low ”0” 0 0.8 V VR9 OFF
UHF
Logic low ”0” 0 0.5 V VR2 OFF
ON/OFF
Logic low ”0” 0 0.5 V VR3 OFF
SPWR3 COB-
BA_D
TXPWR1 MAD CCont Logic high ”1” 2.0 V VR5 ON , TX
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PENTA Logic high ”1” 2.0 V VR10 ON , 2Ghz
UHF
Logic low ”0” 0 0.5 V VR10 OFF
pwr control en­able
Logic low ”0” 0 0.5 V VR5 OFF
Nokia Mobile Phones Ltd.
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NSW-6 Disassembly & Troubleshooting
name
TXWR2 MAD PENTA Logic high ”1” 2.0 V VR12 ON ,
Logic low ”0” 0 0.5 V VR12 OFF
PAMS Technical Documentation
FunctionUnitMaxTypMinParameterToFromSignal
TDMA1900 TX– upconverter en­able
TXWR3 MAD TDMA800
TX–up­converter
VR1 CCont RF Voltage 2.7 2.8 2.85 V Supply for
VR2 CCont RF Voltage 2.7 2.8 2.85 V Supply voltage
VR3 CCont RF Voltage 2.7 2.8 2.85 V Supply voltage
VR4 CCont RF Voltage 2.7 2.8 2.85 V Supply voltage
Logic high ”1” 2.0 V AMPS &
TDMA800 TX– upconverter en­able
Logic low ”0” 0 0.5 V TX–UC disable
VCTCXO, Erotus VHF prescaler and bias, and 2 GHz PLL
for 1GHZ UHF VCO and pres­caler
for VHF VCO, LO buffer, 1 Ghz TX–mixer and power detector
for EROTUS IF– parts and IF–am­plifier
VR5 CCont RF Voltage 2.7 2.8 2.85 V Supply voltage
for EROTUS TX modulator and TX pwr control circuits
VR6 CCont RF Voltage 2.7 2.8 2.85 V Supply voltage
for EROTUS dig­ital parts and Cobba_D analog supply
VR7 CCont RF Voltage 2.7 2.85 2.9 V TX800 P A bias
and driver ampli­fier supply volt­age
VR7_bias CCont RF Voltage 2.7 2.85 2.9 V TX800 PA bias
switching voltage ”0”=AMPS ”1”=TDMA
V5V CCont EROTUS Voltage 4.8 5.0 5.2 V Erotus and 2
Ghz PLL charge­pump
Page 24
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Issue 1 12/99
PAMS Technical Documentation

Receiver

General instructions for RX troubleshooting
Start the WinTesla–software and use it to start the desired RX–mode of the mobile phone. The troubleshooting flowchart is divided into three steps, general checking, local checking and RX–chain checking. Please notice that before changing ASICs or filters, all solderings and missing components are checked.
IF any RX–filters and/or ASICs are changed, AGC–tunings have to be made!
Connect the desired channel frequency and level to the antenna inter­face.
NSW-6
Disassembly & Troubleshooting
Path of the received signal
Block level description of the receiver: Antenna
Diplexer Duplexer Low Noise Amplifier (LNA) RX filter First mixer
116.19 MHz filter IF–amplifier AGC/buffer second mixer 450 kHz filters buffer/limiter Baseband( FM–detector).
AMPS RX
Diagram on the next page.
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Page 25
NSW-6 Disassembly & Troubleshooting
Apply 879.00 MHz
–116dBm , 8kHz dev, 1
kHz sine signal to
the antenna pad
PAMS Technical Documentation
Connect EXT HS to
audioanalyzator, open
audio
AF: 1 kHz sine signal,
meas SINAD
AF: >12 dB
N
Check UHF Vcnt at C822
V: 2.0 ..3.5 V
Y
Check 3 multiplier
output level C745
N700
V: >80 mVpp ?
Y
Apply 879.00 MHz –50dBm , sine signal to antenna pad.
Check input level
at duplex filter (Z910)
input
P:≅50 dBm
Y
Y
AMPS
RX–chain OK
N
N
N
N
Start synthesizer
troubleshooting
Start synthesizer
troubleshooting
Change diplexer
Z970
Note!
Check all soldering and components in antenna circuit before changing
Check input level at
frontend (N701) input
pin7
P:≅–55dBm
Check output level at
LNA out
pin10
P: >–50 dBm
Check MXR RF level
pin12
P:≅–55dBm
Check MXR IF level,
F= 116.19 MHz
P:≅–50dBm
N
Change duplex filter or
L701
Y
N
Change N701
N
Y
N
Change RX band filter
Z701
Y
N
Y
Check LO input level at N701, pin1 P≅0dBm
f=995.19 MHz
Y
Change N701
Note!
Check all soldering and discrete components of frontend.
Note!
AG2 is on = gain is in low state
Note!
Check all soldering
N
Start synthesizer
troubleshooting
Note!
Check all components around N701
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Issue 1 12/99
PAMS Technical Documentation
NSW-6
Disassembly & Troubleshooting
Check input of EROTUS IF ampli– fier at R744
P:≅–55dBm
Y
Check LIMIN1 level at C768
Y
Check LIMOUT1
output R788
: >300 mVpp
Y
Check COBBA_D IF2A
input at R774
N
N
Check comp. R764
N
N
Check comp. R788 ,
R789, L750, C780 and R774
Change Z741
&C769
Change EROTUS
Note!
Check all components around filter
Note !
Check voltages around EROTUS
Note ! Inductor L750 is not reciprocal, i.e
180 deg rotation will hurt SINAD! So, check placement from OK phone, or try to rotate.
AMPS TX continued above
TDMA800RX
Diagram on the next page.
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Page 27
NSW-6 Disassembly & Troubleshooting
PAMS Technical Documentation
Apply 879.00 MHz
–50dBm signal to
antenna interface
Check RF level of
COBBA_D
N
Check UHF VCO PD2
V: 2.0...3.5 V
Y
Check 3 multiplier
output level at C745
V: >80 mVpp
Check input level
at duplex filter (Z910)
input
Y
NOTE! If AMPS RX check is OK, then only components in AGC1, OUT_rx, IN_rxif and OUT_rxif –lines needs to be checked.
Y
N
N
N
Y
N
TDMA800
RX–chain OK
Start synthesizer
troubleshooting
Start synthesizer
troubleshooting
Change diplexer
Note!
Check all soldering and components in antenna circuit before changing
Check input level at
frontend N701, pin7
Check output level at
LNA out, pin10
Check MXR RF level
pin12
Check MXR IF level,
F= 116.19 MHz
pin14,
N
Change duplex filter or
Y
N
Y
N
Y
N
Y
L701
Change N701
Change RX band filter
Z701
Check LO input level
of N701, pin1
of
f=995.19 MHz
Y
Change N701
N
Note!
Check all soldering and discrete components of frontend.
Note!
AG2 is on = low gain state
Note!
Check all solderings
N
Note!
Check all components around N701
Start synthesizer
troubleshooting
Page 28
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Issue 1 12/99
PAMS Technical Documentation
TDMA800 continued
NSW-6
Disassembly & Troubleshooting
Check input of EROTUS IF amplifier at R744
Y
Check INP_rxif level at R763
Y
Check OUTP_rxif level at R798
Y
Check COBBA_D & start BB troubleshooting
N
Change Z741
N
Change Filters Z750
&Z751
N
Change capacitors C750 & C751
Change EROTUS
Note!
Check all components around filter
Note!
Check all components around filters
Note !
Check all discrete components and supply voltages of EROTUS. Check also AGC1 line.
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Page 29
NSW-6 Disassembly & Troubleshooting
TDMA 1900RX
PAMS Technical Documentation
Apply 1960.02 MHz
–50dBm signal to
Antenna interface
Check RF level of
COBBA_D pin no 10
Check UHF Vcnt V: 2.0...3.5V N870, pin3
Check 3 multiplier output level at C745
V: >80 mVpp
Check input level
of duplex filter (Z960)
N
P:≅–50dBm
NOTE! If RX800 is OK, then RX1900 troubleshooting should be concentrated only on Z960 and N721 area and surrounding components.
Y
N
N
Y
N
Y
N
Y
TDMA1900
RX–chain is OK
Start synthesizer
troubleshooting
Start synthesizer
troubleshooting
Change diplexer Z970
Note! Check all soldering and components
in antenna circuit before changing
Check input level of frontend N721, pin7
P:≅–55dBm
Check output level at
LNA out, pin10
P:≅–50dBm
Check MXR RF level
pin12
P:≅–55dBm
Check MXR IF level,
F= 116.19 MHz,
pin14
N
Change duplex filter or
Y
N
Y
N
Change RX band filter
Y
N
Y
L721
Change N721
Z726
Check input level of frontend N721, pin1
F=2076.21 MHz
Y
Change N721
N
Note!
Check all soldering and discrete components of frontend.
Note!
AG2 is on =low gain state
Note!
Check all soldering
N
Start synthesizer
troubleshooting
Note!
Check all components around of N721
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Issue 1 12/99
PAMS Technical Documentation
TDMA1900RX continued
NSW-6
Disassembly & Troubleshooting
Check input of EROTUS IF amplifier at R744
Y
Check INP_rxif level at R763
Y
Check OUTP_rxif level at R798
Y
Check COBBA_D & start BB troubleshooting
N
N
N
Change Z741
Change Filters Z750
&Z751
Change capacitors C750 & C751
Change EROTUS
Note!
Check all components around filter
Note!
Check all components around filters
Note !
Check all discrete components and supply voltages of EROTUS. Check also AGC1 line.
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Page 31
NSW-6 Disassembly & Troubleshooting
PAMS Technical Documentation

Transmitter

General Instructions for TX Troubleshooting
Always use RF–cable connected from antenna interface to analyzer through an attenuator. This is important to protect analyzer against exces­sive rf–power and not to let any unwanted RF power leak to the cellular frequencies.
Start the Wintesla software and select TX mode under testing (AMPS,DAMPS or TDMA1900). It is useful to select mid channel (383 for AMPS/DAMPS or 1000 for TDMA1900) and power level 2. Select random data for digital mode of operation.
One of the basic test is to monitor current when transmitter is on. If cur­rent consumption does not change when transmitter is set on the fault is in the PA area.
Nominal current consumptions on power level 2 in mid channel: AMPS: 650–850 mA TDMA800: 300–350 mA TDMA1900: 350–400 mA Also, if pressing the PA package more tightly to PCB does have an effect
on current consumption the fault is in the PA. In case of a faulty PA, the replacement should be done only under correct ESD precaution and us­ing a hot air gun set to 10m/s and 300 degrees centigrade. The new PA must be taken from a vacuum package and the heating process should be done in less than 30 seconds. Note, that the ground slug of the pack­age must be properly soldered and excessive solder material, if any, has to be removed.
If any components in the TX chain are replaced, the power level tun­ings have to be checked and retuned.
Tuning targets are presented at next page. Set power supply voltage. Connect pulse power meter or spectrum analyzer. Use attenuator, if
needed.
Page 32
Set settings for spectrum analyzer in power level tuning:
Set span 0 Hz Set Ref LVL 30 dB Set Ref LVL offset and ––> Attenuation to Antenna Pad Set RBW and VBW 300 kHz Set sweep time 50 ms Set TRIG: SWEEP CONT, VIDEO –10 dBm
Nokia Mobile Phones Ltd.
Issue 1 12/99
PAMS Technical Documentation
Set marker at middle of slot. Check that spectrum analyzer frequency is correct
Set settings for pulse power meter
Do calibration if needed. Set correct frequency Set Ref LVL offset ––> Attenuation to Antenna Pad Set correct duty cycle, 33,3 % in digital mode and 100 % at
analog mode. Select Tuning –> Using WinTesla Select Tuning –> TX power
–> LowBand/HighBand –>EEPROM values
All four tuning channels have to be tuned. Repeat tuning for A, B, C and D tuning channel. Tuning channel change read old tuning values from phone’s EEPROM.
NSW-6
Disassembly & Troubleshooting
Adjust power level by clicking the + and – buttons, power level change is done by keyboard keys and ↓ .
Tune power levels, which are shown by ”# for calculate” Press Calculate button to calculate other power levels. Check tuning, Do fine tuning if needed.
Once all TX tuning channels are correct, press SAVE button
.
Tuning done, if both Analog mode and 800 MHz and 1900 MHz digital mode tuned
.
Difference between measured TX power from Test Pad of panel and Antenna Pad, must be taken care so that measurements from An­tenna Pad give the correct results.
800MHz Analog TX output power
Power level RF Power at ext. Anten-
na pad
2 26.0 dBm +/– 0.1 dB +0.5…– 1.0 dB
Tuning target tolerance Testing Limits
26.5 – 25.0 dBm
800MHz Digital TX output power
Power level RF Power at ext. Anten-
na pad
2 26.8 dBm +/– 0.1 dB +0.5/– 1.0 dB
3 23.5 dBm +/– 1 dB +/– 2.0 dB
4 20.0 dBm +/– 1 dB +/– 2.0 dB 5 16.0 dBm +/– 1 dB +/– 2.0 dB 6 12.0 dBm +/– 1 dB +/– 2.0 dB 7 8.0 dBm +/– 1 dB +/– 2.0 dB
Issue 1 12/99
Nokia Mobile Phones Ltd.
Tuning target tolerance Testing Limits
27.3 – 25.8 dBm
Page 33
NSW-6 Disassembly & Troubleshooting
PAMS Technical Documentation
Power level
na pad
8 4.0 dBm +/– 1 dB +/– 2.0 dB 9 –0.0 dBm +/– 1 dB +/– 2.0 dB 10 –4.0 dBm +/– 1 dB +/– 2.0 dB
Testing LimitsTuning target toleranceRF Power at ext. Anten-
Check, that power level PL2 TXC DAC value is on allowed range +50...300.
TDMA1900 TX output power
Power level RF Power at ext. Anten-
na pad
2 25.9 dBm +/– 0.1 dB +0.5– 1.0 dB
3 23.0 dBm +/– 1 dB +/– 2.0 dB 4 20.0 dBm +/– 1 dB +/– 2.0 dB 5 16.0 dBm +/– 1 dB +/– 2.0 dB 6 12.0 dBm +/– 1 dB +/– 2.0 dB 7 8.0 dBm +/– 1 dB +/– 2.0 dB 8 4.0 dBm +/– 1 dB +/– 2.0 dB 9 0.0 dBm +/– 1 dB +/– 2.0 dB 10 –4.0 dBm +/– 1 dB +/– 2.0 dB
Tuning target tolerance Testing Limits
26.4 – 24.9 dBm
Check, that power level PL2 TXC DAC value is on allowed range +0...+250.
Path of the transmitted signal
AMPS/DAMPS Cobba TX I/Q DAC – I/Q–modulator – gain step amplifier – linear gain
control amplifier – IF BPF – Upconverter – TX Driver amplifier – BPF– Power Amplifier – Directional Coupler– Duplexer –Diplexer – Antenna.
TDMA1900D Cobba TX I/Q DAC – I/Q–modulator – gain step amplifier – linear gain
control amplifier – IF BPF –Upconverter – BPF– TX Driver amplifier – BPF– Power Amplifier – Directional Coupler– Duplexer – Diplexer – An­tenna.
Power detection and power control circuits are located under the power control part of this guide.
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Issue 1 12/99
PAMS Technical Documentation

Troubleshooting diagrams for TX

AMPS TX
Connect an RF–cable to the antenna interface and connect the cable to a spectrum analyzer input. Start WinTesla–software and set the phone to Analog mode. Set channel 383 and Powerlevel 2 and measure RF ouput level. Please notice insertion loss of the cable and attenuations in the test jig or antenna adapter. It is recommended to use an external attenuator to avoid overloading the spectrum analyzer.
AMPS, PL2, CH383
Y
Check current
consumption
I: >700 mA
N
Check Antenna Circuit
and Duplex–filter.
Chort circuit in PA?
NSW-6
Disassembly & Troubleshooting
Note!
In AMPS mode P A pin 16 bias– V oltage should be > 2.2V.
Check all supply voltages and solderings Check also N900 pin3 frequency and input power. Should be > –8 dBm and f = 997.68 MHz. If not start synth trouble shooting (TX–LO is missing)
Press down PA
Inreasing current
consumption ?
N
Check gain control voltage at C720
V: >2.5 V
N
Check TXC
V: >1.5 V
Y
Start Power control
troubleshooting
Y
Y
N
Change P A
Check possibility for
delamination
Check PA input PWR
P: > 0 dBm
N
Check Z901 filter
insertion loss
<4dB
N
TX driver input power
P: > –20 dBm
N
Delamination means, that the chip has loosened inside the
package during reflow.
Y
Y
Y
Change P A
Check C909, R905 and
C910
Change driver N902
Check COBBA
TXCDAC
(BaseBand)
Issue 1 12/99
N
Nokia Mobile Phones Ltd.
Page 35
NSW-6 Disassembly & Troubleshooting
Continues from previous page
Y Check TXIF Z900 Pin7
P: >–25 dBm
f: 161.19
MHz
N
PAMS Technical Documentation
Change upconverter
N900
Is Z900 Insertion loss too high?
IL>5 dB
N
Check modulator output at R925
P≅ –18dBm max
Is TX I/Q OK?
V: 0.8 VDC +/– 0.4 V
(symmetrical)
Y
Change filter Z900
N
Y
N
Check R925
Check
I&Q
COBBA
DACs
(BaseBand)
Note!
check also I/Q–resistors R760
Page 36
Change N700
Y
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Issue 1 12/99
PAMS Technical Documentation
TDMA800 TX
The transmitter chain is exactly same as in AMPS–mode, but the power amplifier is biased to more linear mode, so it is important, that AMPS have no faults.
Is AMPS mode OK ?
Y
Check Vbias PIN16
N903
V: > 2.8 V
NSW-6
Disassembly & Troubleshooting
N
Start AMPS
troubleshooting
N
Check CCONT
VR7_bias
Y
Start power level tuning. Does it work?
(BaseBand)
N
Change N700 and/or Cobba
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Page 37
NSW-6 Disassembly & Troubleshooting
TDMA1900 TX
TDMA1900 mode and DAMPS mode have common IF section and anten­na circuit and thus it is important that DAMPS mode have no faults.
N
Is TDMA800 mode OK
?
Y
PAMS Technical Documentation
Start TDMA800
troubleshooting
Are LO signals OK ?
Y
Check current
consumption
I: > 350mA(rms)
N
Make press down test
for P A. Inreasing
current consumption ?
N
N
Y
Check antenna circuit
Short circuit in PA?
Y
Resolder or change PA.
Start synth
troubleshooting
and Duplex–filter
Note!
Check VHF and UHF locals including LO–buffer, measuring point for UHF is N980 pin5.
Note! The P A ground slug might be poorly soldered or there is delamination on chip.
Page 38
TDMA1900 continued next page
Nokia Mobile Phones Ltd.
Issue 1 12/99
PAMS Technical Documentation
NSW-6
Disassembly & Troubleshooting
Check VAPC
V:>2.5 V
Check TXC Typ 1.5V@PL2
Start powercontrol troubleshooting
Check COBBA TXCDAC (BaseBand)
Check PA input
Y
power
P:> 0 dBm
N
N
Check Z975 filter
Insertion loss IL>4dB
Y
Check TX–driver input P:> –20dBm
Check N980 upconverter output
P:> –20 dBm
N
N
N
Y
Change PA
Y
Change Z975
Y
Y
Change N951
Check Z950 insertion loss. Max 4 dB.
N
Check TX–IF f: 196.23 MHz P:> –35 dBm
Check Z900
N
insertion loss. If > 4dB, check R926 and C923 or change N700.
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Page 39
NSW-6 Disassembly & Troubleshooting
Power control loop
Power control section is basically similar for both bands, except for that both bands have their own directional coupler and detector. The power control is actually made in EROTUS IC.
PAMS Technical Documentation
Is V929, V930 voltage drop about
0.3–0.4 V
Y
Is TXLX functionality OK ?
TXLX are LOW on power levels PL 2…7
Y
Is DETO vs. output power and TXC OK? See chart below.
Check V930, V929
N
Check bias circuit around diodes.
Check PIN diode
N
bias components. Check BB controls.
(BaseBand)
N
Check power
control components
near N700
Press N700
Change N700
Note ! See DETO vs. Output power
curve
Note:
1. DETO and TXC will be about same in each mode.
2. TXA is high during modulation.
3. TXLX signals will draw about 4mA current in high state.
Change N700
TYPICAL DETECTED VOLTAGES AT POWER LEVELS PL2…PL10
800D 1900
D
Pout TXC LB–DETO Pout TXC UB–
DETO
PL dBm dac mV PL dBm dac mV
2 26.8 250 1650 2 26.8 124 1478 3 23.5 77 1350 3 23.0 27 1275 4 20.0 –40 1120 4 20.0 –53 1120 5 16.0 –127 930 5 16.0 –128 937 6 12.0 –187 840 6 12.0 –177 831 7 8.0 –228 750 7 8.0 –215 762 8 4.0 –188 840 8 4.0 –205 768 9 0.0 –229 740 9 0.0 –253 693
10 –4.0 –290 650 10 –4.0 –329 531
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Issue 1 12/99
PAMS Technical Documentation
Synthesizers
There are four oscillators generating the needed frequencies for RF–sec­tion. 19.44 MHz reference oscillator, 1GHz UHF VCO, 2Ghz UHF VCO and VHF VCO. Only VHF VCO is discrete solution and it has two fixed frequencies, 322.38 MHz for lowband and 392.46 MHz for upper band. VHF VCOs operating frequency is controlled by BAND–signal and PLL– circuit of EROTUS. All locals are locked to the stable reference oscillator.
The frequency range for 1GHz UHF VCO is 985.23 – 1010.2 MHz and for 2Ghz UHF VCO is 2046.2 – 2107.2 Mhz.
A practical way to check out synthesizer statusis to measure the control voltage of the VCO from the integrator capacitor C822 (LB) , C883 (HB) or C789 (VHF). The voltage must be stable and in the correct range, and the local oscillator is running correctly.
19.44 MHz Reference oscillator
NSW-6
Disassembly & Troubleshooting
The 19.44 MHz oscillator frequency (G850) is controlled by COBBA_D. This 19.44 MHz signal is connected to EROTUS and TDMA1900 PLL–cir­cuit.
All synthesizers use the divided VCTCXO signal as reference signal for Phase locked loop to provide the correct LO–frequency. The VCTCXO output signal is also used to generate multiple LO frequency by multipli­ers.
Baseband also needs the reference signal so it can generate necessary clock signals, and the VCTCXO output signal is also buffered and con­nected to MAD.
58.32 MHz Triple Multiplier
The 3–multiplier is a integrated solution in EROTUS and it is used to gen­erate second LO frequency for the receivers. The 3*multiplier output sig­nal is multiplied by 2 and then it is fed to the 2nd downconverter.
Issue 1 12/99
Nokia Mobile Phones Ltd.
Page 41
Ty eYourNameHere Ty eDateHere
NSW-6 Disassembly & Troubleshooting
PAMS Technical Documentation
19.44 MHz oscillator
VCTCXO
OUTPUT :
19.44 MHz G850
P:>0.8Vpp
Y
Check
AFC–signal from
G850, pin1
V≅ 1.05 V
Y
Check RFC–buffer output, C719 P: >0.3 Vpp
Y
N
N
N
Change G850
Check resistor
R851
Check EROTUS supply voltages.
Note! Check all soldering and supply voltages
for VCTCXO and RFC–buffer. Check also coil L850.
Start BB
N
troubleshooting.
Check 2G PLL
N880, pin 15
P: >0.8 Vpp
Y
Check 3X tank N700, C745 P: >150 mVpp
Change EROTUS.
continues next page
N
Change capacitor
C854
Check L762 and
N
C745.
Page 42
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PAMS Technical Documentation
19.44 MHz Oscillator (continued)
NSW-6
Disassembly & Troubleshooting
Check VAPC
V:>2.5 V
Check TXC Typ 1.5V@PL2
Start powercontrol troubleshooting
Check COBBA TXCDAC (BaseBand)
Check PA input
Y
power
P:> 0 dBm
N
N
Check Z975 filter
Insertion loss IL>4dB
Y
Check TX–driver input P:> –20dBm
Check N980 upconverter output
P:> –20 dBm
N
N
N
Y
Change PA
Y
Change Z975
Y
Y
Change N951
Check Z950 insertion loss. Max 4 dB.
N
Check TX–IF f: 196.23 MHz P:> –35 dBm
Check Z900
N
insertion loss. If > 4dB, check R926 and C923 or change N700.
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Page 43
NSW-6 Disassembly & Troubleshooting
VHF VCO
The VHF VCO signal is used to generate transmitter Intermediate fre­quencies. The VHF VCO has two fixed frequencies. Operating frequency is locked in Phase locked Loop, which is controlled by baseband.
Because the oscillator has two frequencies, it has also two different switching modes. These modes are controlled by a BAND–signal. In AMPS and TDMA800 modes the VHF frequency is 322.38 MHz and log­ical level of BAND–signal is “HIGH”. In TDMA1900 mode a higher inter­mediate frequency is needed, so the operating frequency is increased to
392.46 MHz. The BAND– signal is set to logical level “Zero”. The VHF VCO output signal is fed to EROTUS LO–pin VV_in. Inside the
EROTUS, the signal is divided for the Phase detector and TX parts. Be­fore injection to the I/Q–modulator, the frequency is divided by 2 .
PAMS Technical Documentation
Is oscillator
locked ?
N
Check oscillator
output level
at C744
P:
N
Check N770
Y
Check PD1 at
C790 V=1–2 (LB) =2.8–3.8 V (HB)
Y
OK
Y
Check EROTUS (N700)
(SCLK):2.8V (SDATA):2.8V (SENA1):2.8V
SENA is 0 during SCLK
and SDA TA
N
Change N770
N
Change V723
Note!
The Oscillator is locked, when the frequency is stable.
Note! SENA1 = EROTUS PLL
SENA2 = 2G PLL (N870, pin 13)
Note! Check all solderings and
missing components
Note! Check all solderings and
missing components
Page 44
CHANGE EROTUS!
Y
Nokia Mobile Phones Ltd.
Note! Check all components and soldering
Issue 1 12/99
NSW-6
PAMS Technical Documentation
Disassembly & Troubleshooting
AMPS& TDMA800 UHF SYNTHESIZER
1 GHz UHF VCO (G880) generates the first injection for RX (869...897) and the final injection for TX (824...849 MHz). The output frequency of the module depends on the DC–control voltage supplied by EROTUS in line PD2.
Is the frequency locked?
N
What is VCO output
levet ?, G800
P=–10–0 dBm
Y
Check local input
level of frontend
(N701, pin 1)
P=–10–0 dBm
N
Y
Check feedback
input level of
EROTUS
(at C825)
P=–10–0 dBm
Note! Frequency = 985.23...1010.2
Vcnt = 1.3...3.5 V , C826
Note!
N
Change G880
N
N
Check C827 &
L820
Change C825
Check all soldering & missing components
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Check EROTUS (N700)
(SCLK):2.8V
pin 55 (SDATA):2.8V
(SENA1):2.8V
SENA is 0 during SCLK
and SDATA
Start BB
N
troubleshooting
Nokia Mobile Phones Ltd.
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NSW-6 Disassembly & Troubleshooting
TDMA1900 UHF SYNTHESIZER
2GHz UHF synthesizer generates desired injection frequencies for TX and RX chain. The output frequency of the VCO depends on the control voltage of the PLL–circuit.
PAMS Technical Documentation
Note!
Is the fequency
locked ?
N
What is VCO output
levet ?, G881
P=–10–0 dBm
Y
Check local input
level of frontend
(N721, pin 1)
P=–10–0 dBm
N
Y
Check feedback
input level of
N870
P=–10–0 dBm
Frequency = 985.23...1010.2 Vcnt = 1.3...3.5 V , C887
Note!
N
Change G881
N
N
Check C889 & C882
Check C888 & L880
Check all soldering & missing components
Page 46
Check N870
pin 11 (SCLK):2.8V pin 12 (SDATA):2.8V pin 13 (SENA1):2.8V
SENA is 0 during SCLK
and SDATA
N
Start BB troubleshooting
Nokia Mobile Phones Ltd.
Issue 1 12/99
PAMS Technical Documentation

RF ASIC DATA

General Info
EROTUS (N700) provides three main RF functions:
1. RX/TX IF blocks
2. PLLs for VHF and 1 GHz UHF
3. TX Power control circuits The receiver block consists of IF buffers, active mixers, 6–multiplier
(3*+2*), AGC amplifier and limiter. The transmitter section includes a digital gain step amplifier, a linear gain
control amplifier, a divider, an I/Q Modulator and control part for the Transmitter Power Control loop.
NSW-6
Disassembly & Troubleshooting
The PLL section is controlled via the serial bus and contains both 1GHz UHF and VHF PLLs and prescalers.
EROTUS ASIC
Erotus is a uBGA–package, so RF probing for the most signals is impos­sible at EROTUS pins. Signals can be checked at those components, to which the signals are fed to.
RX Front ends N701 and N721
Pin no. Pin name Nominal
level
1 LO IN –5dBm Mixer LO input 2 Vdd buf 2.8V LO–buffer Vdd 3 LO out 0dBm LO–buffer output 4 GND 0 Ground 5 Vdd LNA 2.8V LNA Vdd 6 GND 0 Ground 7 LNA in LNA RF input port 8 GND 0 LNA ground
9 Gain Sel >2V LNA gain select 10 LNA out LNA output port 11 GND 0 Ground 12 Mxr RF Mixer RF input port 13 GND/IF 0 Ground ( –IF tuing in N721) 14 MXR IF Mixer IF input port 15 GND 0 Ground 16 Vdd MXR 2.8V Mixer LO–buffer Vdd and LO–buffer tuning
Description
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Nokia Mobile Phones Ltd.
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NSW-6 Disassembly & Troubleshooting
PAMS Technical Documentation
Power Amplifiers N903 & N960
RF9130 (N903)
Pin no. Pin name Description
1 VCC Power supply pin for bias circuit. Add RF bypass capacitor. 2 L TUNE Tuning pin for interstage matching network. A short (TBD)
transmission line length is required for tuning interstage match.
3 GND Ground 4 VCC1 Power supply pin for the first stage collector. A RF choke and
a bypass capacitor is required for this pin.
5 GND1 Ground pin for the first stage. 6 RF IN RF input. DC coupled. 7 N/C No connection or GND 8 V
reg
9 GND Ground 10 GND Ground 11 GND Ground 12 RF OUT RF output and bias for the output stage.The power supply for
13 RF OUT Same as pin 12. 14 2 * f
0
15 GND Ground 16 V Package
bias
Ground Ground connection. The backside of the package should be
Base
RF9131 (N960)
Regulated power supply for bias circuit. PA shut down.
the output transistor needs to be supplied to this pin. Second harmonic trap. Add capacitor to ground. Bias control 2.8V. Add RF bypass capacitor.
connected to the ground plane through a short path.
Pin no. Pin name Description
1 N/C No connection. (GND) 2 VCC
Q2C
Power supply pin for the 2. stage. A bypass capacitor is re­quired.
3 N/C No connection. (GND) 4 VCC
Q1C
Power supply pin for the 1st stage. A bypass capacitor is re­quired.
5 N/C No connection. (GND) 6 RF IN RF input. DC block on chip. 7 N/C No connection. (GND) 8 VREG Regulated voltage supply for the bias circuit. 9 BIAS3 Bias ground. 10 N/C No connection. (GND) 11 N/C No connection. (GND) 12 RF OUT RF output, Use this pin for an output matching capacitor. Do
not feed bias through this pin. (DC coupled)
13 RF OUT RF output and bias for the output stage. 3rd stage collector. 14 RF OUT RF output and bias for the output stage. 3rd stage collector.
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Nokia Mobile Phones Ltd.
Issue 1 12/99
PAMS Technical Documentation
15 N/C No connection. (GND) 16 N/C No connection. (GND) Package Base
Ground Ground connection. The backside of the package should be
connected to the ground plane through a short path.
PENTA regulator N702
NSW-6
Disassembly & Troubleshooting
DescriptionPin namePin no.
Pin no. Pin name Nominal
level
Description
1 Bypass Pin for external bypass capacitor
2 Common
>2V Enable for the whole circuit
enable 3 VR1cntrl >2V Regulator 1 ON/OFF 4 VR2cntrl >2V Regulator 2 ON/OFF 5 VR3cntrl >2V Regulator 3 ON/OFF 6 VR4cntrl >2V Regulator 4 ON/OFF 7 VR5cntrl >2V Regulator 5 ON/OFF 8 GND 0 Ground 9 VR5 2.8V Regulator 5 output
10 Vcc2 VBAT VR4 and VR5 common input voltage 11 VR4 2.8V Regulator 4 output 12 VR3 2.8V Regulator 3 output 13 VR2 2.8V Regulator 2 output 14 VR1 2.8V Regulator 1 output 15 Vcc1 VBAT VR1, VR2 and VR3 common input voltage 16 N/C Not connected
TDMA1900 UPCONVERTER N980
Pin no. Pin name Nominal
level
Description
1 VDD1 2.8V Supply voltage 2 N/C Not connected 3 N/C Not connected 4 GND 0 Ground 5 LO IN 0dBm TX local input 6 GND 0 Ground 7 RF OUT RF output 8 VDD2 2.8V Supply voltage 9 N/C Not connected
10 N/C Not connected 11 GND 0 Ground 12 VDD3 2.8V Supply voltage 13 GND 0 Ground 14 IF IN Intermediate frequency input 15 N/C Not connected 16 TX ENA >2V TX enable
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Nokia Mobile Phones Ltd.
Page 49
NSW-6 Disassembly & Troubleshooting
TDMA1900 PLL–circuit N870
PAMS Technical Documentation
Pin no. Pin name Nominal
level
Description
1 FAST 2.8V Enable input for fast chargepump 2 CPF Fast charge pump output 3 CP Normal charge pump output 4 VDD2 2.8V Power supply voltage 5 Vss3 0 Ground 6 RFI Main divider input 7 Vss2 0 Ground 8 POL 2.8V polarity select 9 PON 2.8V Power on input
10 Vss1 0 Ground 11 CLK 2.8V Programming bus clock input 12 DATA 2.8V Programming bus data input 13 E 2.8V Programming bus enable input 14 Vdd1 2.8V Power supply voltage 15 XTALB Complementary crystal frequency input 16 XTALA Complementary crystal frequency input 17 GND(CP) 0 Ground for charge pump 18 Vcc 4.8V Supply voltage for charge pump 19 Iset charge pump currents setting 20 LOCK Out of lock detector
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Issue 1 12/99
PAMS Technical Documentation

Warranty transfer

Items: Service accessories: Product codes: 1 Warranty Cable XMS–3 0730174 2 Flash Adapter FLA–9 0770187 The Warranty cable XMS–3 and 2 pcs Flash adapters FLA–9 are used to
connect two phones and transfer the warranty data (user settings and se­rial numbers) from one phone to another. The warranty transfer proce­dure is described below:
Point of Sale
– Phone 1 is broken and Phone 2 is the swap phone.
NSW-6
Disassembly & Troubleshooting
– Number the phones 1 and 2 to avoid mix–up. – Plug the warranty cable XMS–3 between the flash adapters and con-
nect the adapters to the phones 1 and 2. (in place of the phone battery) – Turn the phone 2 on and then on Silent Profile – Start the warranty data transfer by selecting code *#92772689# in phone
2. – Select option ”Transfer user data?” and press OK, ”Confirm transfer?”
Press OK. – Wait untli the transfer is completed. – Turn Phone 2 off, then back on and check welcome note and profile. – After the transfer check with WinTesla the original and warranty ESN of
the phone 2. – Send the broken phone no.1 to the central service.
Service Center
– Check and repair the phone . – Change Warranty State from ”defective” to ”exchange”. – Win Tesla and PKD–1CS are needed – Menu: Software –> Warranty Info –> Info State –> select ”Exchange” – Send the repaired phone to the dealer.
Point of Sale
– Use the returned phone as a swap phone. – When the Warranty Info is transferred into a swap phone the Warranty
State changes to USE mode. – Send the broken phone to the central service.
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Nokia Mobile Phones Ltd.
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NSW-6 Disassembly & Troubleshooting
PAMS Technical Documentation
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