Nokia NSW-6 Series Installation instructions

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

NSW-6
Disassembly & Troubleshooting PAMS Technical Documentation
Page 2 Issue 1 12/99
Nokia Mobile Phones Ltd.
AMENDMENT RECORD SHEET
Amendment
Number Date Inserted By Comments
12/99 OJuntune New disassembly

NSW-6
Disassembly & Troubleshooting
PAMS Technical Documentation
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Issue 1 12/99 Nokia Mobile Phones Ltd.
CONTENTS
Page No
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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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Disassembly & Troubleshooting PAMS Technical Documentation
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PENTA regulator N702 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA1900 UPCONVERTER N980 49. . . . . . . . . . . . . . . . . . .
TDMA1900 PLL–circuit N870 50. . . . . . . . . . . . . . . . . . . . . . . .
Warranty transfer 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NSW-6
Disassembly & Troubleshooting
PAMS Technical Documentation
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Issue 1 12/99 Nokia Mobile Phones Ltd.
Disassembly
1. Remove battery
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 re-
moval
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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Disassembly & Troubleshooting PAMS Technical Documentation
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4.Remove A–cover screws (2 pcs)
5. Turn the phone over and remove C–cover screws (3 pcs)

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Disassembly & Troubleshooting
PAMS Technical Documentation
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Snap
Snap
6.Release C–cover snaps
7. Open covers

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Disassembly & Troubleshooting PAMS Technical Documentation
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8. Remove shield screws (2 pcs)
9. Remove shield

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Disassembly & Troubleshooting
PAMS Technical Documentation
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10. Remove main PCB
11. Remove slide frame, UI PCB follows

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Disassembly & Troubleshooting PAMS Technical Documentation
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12. Now parts can be separated from the cover.

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Disassembly & Troubleshooting
PAMS Technical Documentation
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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
Within alignment those parameters are adjusted, that cannot be set accu-
rate enough by design, because of component tolerances.
Due to use of 5% resistor values, the channels of the CCONT A/D con-
verters need to be aligned in the production phase.
Within battery voltage tuning VBAT the MCU software reads the A/D read-
ing 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. Ca-
libration 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 bat-
tery 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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Disassembly & Troubleshooting PAMS Technical Documentation
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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 di-
vided 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

NSW-6
Disassembly & Troubleshooting
PAMS Technical Documentation
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Issue 1 12/99 Nokia Mobile Phones Ltd.
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
YES
NO
YES
NO
YES
NO
YES YES
NO
Phone is
totally dead
VBat=3.6V at R153 Failure in VBat line,
check X100
Faulty circuit N150
Voltage at J150 of CCONT
(N150) = 3.6V
C166 (VBB) = 2.8V
C158 (VR1) = 2.8V
when PWR switch pressed or
watchdog disable pin
grounded
Faulty circuit N160
CCONT(N150) J150 = 0V
when PWR switch pressed
or watchdog disable pin
(X101 pin 11) grounded
Check R160, PWR switch,
connector X300
Check watchdog disable
line X101
See section: Power does not
stay on

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Disassembly & Troubleshooting PAMS Technical Documentation
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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
FLASH (D201) VBB is 2.8V (C203),
NO
YES
OK
check
VCXO G850
YES
PURX (J140) master reset=”1”(2.8V)
RFC (J250) 19.44 MHz sine wave
Clock signal: 700mV Vpp typ.
COBBACLK (J210) 9.72MHz sq.wave
clock signal 2.80 Vpp
VBB (C166) 2.8 V
VR1 (C158) 2.8 V
NO See section ”Phone is totally dead”
YES
Sleep clock SLCLK (J157)
square wave 32 kHZ
NO Check sleepclock circuitry NO
Faulty circuit N150
or over loaded PurX line
YESYES
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
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
VBAT > 3.0 V
C154, C155, C190
SRAM (D200) VBB is 2.8 V (C200),
FLASH VPP is > 2.8 V (C202)
Check control lines of SRAM and FLASH:
RAMSelX (J207), RPMSelX (J208)
MCURDX and MCUWRX (X200 pins 19 and 18)
e.g. there is voltage spikes when trying to write
and read something to SRAM and FLASH
OK
OK

NSW-6
Disassembly & Troubleshooting
PAMS Technical Documentation
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Issue 1 12/99 Nokia Mobile Phones Ltd.
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 sec-
onds, 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 sec-
onds. The power off function of CCONT can be prevented by connecting
a short circuit wire from WDDISX (CCONT E4 (J150)) to ground (J151).
Power doesn’t stay on or phone is jammed
FLASH (D201) VBB is 2.8V (C203) NO N150 is faulty
VBAT is OK =
3.8V
YES
YES
PURX (J152) master reset = ”1” (2.8 V)
NO Sleep clock SLCLK
square wave 32 kHz
NO
YES
Faulty circuit N150
or over loaded PURX line
check sleep
clock circuitry
(B150, R157...)
YES
YES
YES
Connect short circuit wire from
OK
CCONT (N150) watchdog is served?
J154 pulses 1 –> 0)
YES Software is able to run
after few seconds, check
BSI (X100 to C167) and
BTEMP (X100 to C168)
lines
If power is switched off
Open pins or faulty circuit:
D202, D200, D201, N150
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
Watchdog J150 to ground J151
Check VCXO G850
NO

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Disassembly & Troubleshooting PAMS Technical Documentation
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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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Disassembly & Troubleshooting
PAMS Technical Documentation
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Issue 1 12/99 Nokia Mobile Phones Ltd.
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
NO
YES
Analog reference voltage Vref is 1.5
of Cobba (N250) at C169
NO
YES
YES
NO
Synthesizer lines: SENA2 (N880 pin 13)
SCLK (N880 pin 11)
SDATA (N880 pin 12)
pulses 0 –> 1 during off burst
NO
YES
NO
YES
NO
YES NO
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
YES
NO
YES
max, frequency is 12 kHz max
NO
YES
MAD D202
CCONT N150
MAD
COBBA
D202
N250
Digital data signal IF2AN (R789) –>0.6Vpp, 0–>2.2V DC
TXLX1 (R934 pin 1) and TXLX2 (R934 pin 2) 0–> 1 (2.8 V)
Check supply voltages for RF:
Check
Check COBBA N250
if TXC fails
Check MAD D202 if
TXA fails
RX: VR1 (C158), VR2 (C159), VR3 (C160), VR4 (C161),
VR5 (C162), VR8 (N702 pin 14), VR9 (N702 pin 13),
VR10 (N702 pin 12) and V5V (C176)
TX: VR3 (C160), VR7 (C164), VR7_bias (R901),
VR11 (N702 pin 11), VR12 (N702 pin 9) and
TXPWR3 (C903)
Check
N250
Check
R256
Digital data signal IF2AP (R788) –>0.6Vpp, 0–>2.2V DC
Digital data signal IF2DN (C750) –>170 mVpp typ, 0–>2.7V DC
AGC1 (R758) 0 –> 2.3V max. during receiving burst
AFC (R850) 0 –> 1.2V typ. During receiving burst
Digital data signal IF2DP (C751) –>170 mVpp typ, 0–>2.7V DC
Frequency is 450MHz
Check COBBA N250 if DC
fails
Check RF–part if analog
signal fails
DAX signal (J211) pulses1–>0 during receiving slot Check
N250
Check
RF–part
Check
N250
Used
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

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Disassembly & Troubleshooting PAMS Technical Documentation
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Charging failure
YES
Nothing happens when charger is connected
Voltage level at VCHAR–pin of CCONT is
higher than 0.17 V
when charger is connected
NO Check
X102, R158, R160,
F150
YES
Check N150
Display Information: Not charging
YES
Voltage level at C165 is about 0.8 V when
power is connected BSI resistor value
should be 18 k
NO Check
R158, R163
YES
Voltage level at C168 is about 0.5 V when
power is connected BTEMP resistor value
should be 47 k
NO Check
R163, R161
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
NO Check
N150
Faulty
N151
YES
Voltage levels at R153 are same as VBAT (C180) NO Check
R153, N151
YES
Voltage levels at R153 rises when
charger is connected NO

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Disassembly & Troubleshooting
PAMS Technical Documentation
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RF Troubleshooting
Introduction
Measurements are done using a spectrum analyzer and a high–frequen-
cy probe (Local and reference frequencies and RF–power levels in inter-
mediate 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 con-
nector will be removed from the layout, therefore a connector to the an-
tenna pad needs to be soldered manually.
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 volt-
age 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 un-
derneath, 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 com-
ponents.
There are also lots of discrete components (resistors, inductors and ca-
pacitors) the troubleshooting of which is done just by checking that com-
ponent 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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NSW–6
AAX-1
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
V Voltage of signal (measured with oscilloscope)
VCO Voltage controlled oscillator
VHF Very High Frequency
AF Audio Frequency