Nokia Mobile Phones NPB-1 NB Series Operating instructions

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NPB-1NB
Troubleshooting PAMS Technical Documentation
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Baseband Troubleshooting ................................................................................5
Baseband Testpoints ...................................................................................................... 5
Power Schematic - Plots ..............................................................................................8
CPU Schematic - Plots .................................................................................................9
Fault Finding Charts..................................................................................................... 10
1. Phone is Dead ........................................................................................................10
2. Flash Programming Does Not Work ....................................................................10
3. Phone Stays On or is Jammed ..............................................................................13
4. Display Information : “Contact Service” ...............................................................14
5. No Network Found, No Call Established ..............................................................16
6. Phone Not Registering to a Network ....................................................................17
7. Sim Related Errors ................................................................................................18
8. Audio Faults ...........................................................................................................20
9. Charging Error .......................................................................................................22
Baseband Plots............................................................................................................. 23
Plot1: RFC in Normal Operation ..............................................................................23
Plot 2: Power Up with ACP-7U .................................................................................24
Plot 3: Power up with ACP-8U .................................................................................25
Plot 5: Power up with a power variable power supply ..............................................27
Plot 6: Power up with Power switch (PWRONx) ......................................................28
Plots 7,8,9,10: PCM Clock Tests ...............................................................................29
RF Troubleshooting...........................................................................................32
Introduction.................................................................................................................. 32
Basic Controls with Wintesla....................................................................................... 32
Selecting the Phone and the Operating Band ............................................................32
RF Controls ...............................................................................................................33
Tuning the Phone ......................................................................................................... 34
RX Tuning .................................................................................................................34
TX Tuning .................................................................................................................40
Receiver Fault Finding................................................................................................. 44
General .......................................................................................................................44
Hagar ..........................................................................................................................44
LNA ...........................................................................................................................44
RX-filters ...................................................................................................................44
Antenna Switch ..........................................................................................................45
Transmitter Fault Finding ............................................................................................ 45
General .......................................................................................................................45
Antenna Switch ..........................................................................................................45
PA-Module, Directional Coupler and Power Detector ..............................................45
HAGAR ....................................................................................................................46
Synthesizer Fault Finding ............................................................................................ 46
General .......................................................................................................................46
VCTCXO ...................................................................................................................46
VCO ...........................................................................................................................46
RF Testpoints............................................................................................................... 47

PAMS Technical Documentation Troubleshooting
NPB-1NB
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Measuring Points .......................................................................................................48
RX ..............................................................................................................................48
TX ..............................................................................................................................49
VCO ...........................................................................................................................50
VCTCXO ...................................................................................................................51
Other checking points ...............................................................................................51
Measurement Points -Waveforms ..............................................................................52

NPB-1NB
Troubleshooting PAMS Technical Documentation
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PAMS Technical Documentation Baseband Troubleshooting
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Testpoint Net Name Condition DC-level AC-level
General
R350 VPP Flash or emulated
EEPROM write Nominal 2.8 V Min 1.7V, max 2.85
V
J200 CCONTC
SX Active State Pulsed active 0V Normal state 2.8 V
J212 PURX Powe
r up/down Reset state 0V Normal state 2.8 V
R224 PWRON PWRONX
/
WDDISX
Power on Reset state 0V
Normal state 2.8 V
R217 FBUS_TX FBUS(1) Power on Pulsed DC
(0V to 2.8V)
R217 FBUS_RX FBUS(0) Power on Pulsed DC
(0V to 2.8V)
V204 MBUS Power on Pulsed DC
(0V to 2.8V)

NPB-1NB
Baseband Troubleshooting PAMS Technical Documentation
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Testpoin
tNet Name Condition DC-level AC-level
Power supplies
C201 VB
(baseband) Active state Nominal 3.6V Min 3.0V, max 4.2V
C241 VRX Active state 2.8V
Min 2.7V, max
2.85V
C243 VXO Active state 2.8V
Min 2.7V, max
2.85V

PAMS Technical Documentation Baseband Troubleshooting
NPB-1NB
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Testpoint Net Name Condition DC-level AC-level
Clock
C220 SLEEPCL
KSLCLK Power on Pulsed DC (0V to 2.8V)
C303 RFC RFCLK Active state Typ. 0.8 Vpp
(Min 0.5Vpp,
Max 2.0Vpp)
J317 COBBAC
LK COBBAIF (2) Active state Pulsed DC (0V to 2.8V)
MCU
J323 MEMC(7) RAMSelX Active state Pulsed, active 0V
Non-active 2.8V
J324 MEMC(0) ROM1Sel
XActive state Pulsed, active 0V Non-active 2.8V
J318 MEMC(4) EsysReset
XPower on Reset state 0V, normal state 2.8V

NPB-1NB
Baseband Troubleshooting PAMS Technical Documentation
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NPB-1NB
Baseband Troubleshooting PAMS Technical Documentation
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The phone is dead
The voltage at C404, C202,
C226, C227, C228 is = 3,6V Failiure in Vbatt line. Check X203, R220.
No
Voltage on R224 = 3,6V Defective N201 or
PCB
Yes
No
Voltage at C316= 2,8V
Voltage at C243 = 2,8V
when WDDISX is grounded
Yes
WDDISX = 0 when
PWR switch is pressed
No
Defective CCONT
(N201)
Yes
Check power switch
Check WDDISX line :
PWR switch -> R402
->R224
No
Defective PCB
Ok
See section "Phone is
unable to stay ON"
Yes

PAMS Technical Documentation Baseband Troubleshooting
NPB-1NB
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NPB-1NB
Baseband Troubleshooting PAMS Technical Documentation
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Flash programming doesn’t work
If fault information from Prommer is:
a) MCU doesn’t boot
b) Serial dataline failure
c) Serial clock line failure
Connect R224 (towards N201)
(WDDISX) to GND.
No
Yes
C211 towards N201
(VBB) = 2.8 V
C518 towards C506
(VXO) = 2.8 V
when PWR switch is
pressed.
See section: (2)
See section: "Phone is dead"
No
R308 (PURX) = "1" (2.8V)
after 60ms
Yes
Check C220 (SLEEPCLK)
= 32KHz square wave
Check sleepclock
circuit:
B200, R214,...
Defective N201 CCONT
or overloaded PURX line
No
Yes
Check buffer: V502, R559,...
V502 coll. (RFC)
= 13MHz clock, 700mVpp typ. Check G502
VCXO 26MHz
Yes
Yes
No
Defective N500
HAGAR
Ok
Defective D300
MAD2 or D301
Flash
Ok
Defective PCB
No
Yes
Check the following lines:
M-BUS: X202 pin 3 -> X201 pin 4 -> V204 pin 5
FBUS_RX: X202 pin 8 -> X201 pin 2 -> V204 pin 3
FBUS_TX: X202 pin 7 -> X201 pin 1 -> V204 pin 1
GND: X202 pin 4 -> X201 pin 3 -> GND
Check also pull-up and -down resistors:
R304, 302, 307
No

PAMS Technical Documentation Baseband Troubleshooting
NPB-1NB
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Flash programming doesn’t work
External RAM error Check for activity on control
lines for SRAM : J323
(RAMSelX)
Defective MAD2 (D300)
or short circuit under the
SRAM
Defective SRAM (D302)
Algorithm file or alias
not found. Check the type of the flash
MCU flash Vpp Error Flashing via X202 ?
Voltage at R310
higher than 1,7 V
when flashing ?
Defective flash
or flashing
software has
wrong version
Defective MAD2 (D300), defective
voltagemonitor (D304) or flashing
software has wrong version or short
circuit under SRAM
Unknown error. See
section "Phone Dead"
Yes
Yes
Yes
Yes
No
No
No
No Yes
No
No

NPB-1NB
Baseband Troubleshooting PAMS Technical Documentation
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Phone unable to stay on or phone
is jammed.
CCONT watchdog is
served,
J200 pulses "1" ->"0"
Software is able to run.
Check UI (keys and display)
Ground the watchdog
(Vbb = 2,8 V)
(VXO = 2,8 V) See section "Phone is dead"
PURX (J374) = "1"
(2,8V) after 60 msec.
Check sleepclk
(C220) = 32 kHz
square wave.
Check sleepclk circuit
(B200, R214,....)
Defective
CCONT (N201)
or overloads on
the PURX line.
Check RFC buffer
(V502, R559, C560...)
Yes
Yes
No
No
No
Yes
No
OK
Check G502, 26 MHz Defective Hagar
Possible defective ICs :
MAD2 (D300)
SRAM (D302)
FLASH (D301)
CCONT (N201)
Yes
Yes
Yes

PAMS Technical Documentation Baseband Troubleshooting
NPB-1NB
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NPB-1NB
Baseband Troubleshooting PAMS Technical Documentation
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PAMS Technical Documentation Baseband Troubleshooting
NPB-1NB
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Phone doesn’t register to a
network or the phone is unable to
make a call
C207 (Vcobba) > 2,7V Check CCONT (N201)
Vref at C201 =1,5V Check C210, R509 and
C536.
Check supply voltage during RX slot :
C234 (VCP) > 4,8V
C240 (VRX) > 2,7V
C245, R202, C239 (VSYN_1) > 2,7V
C241 (VSYN_2) > 2,7V
During TX slot :
C242 (VTX) > 2,7V
Check CCONT
(N201)
Check synthesizer
lines during RX slot
R300 (->D300)
R301/302 (->D300)
for pulsing 1<->0
No
Yes
Yes
No
No
No Check MAD2WD1
(D300)
Check COBBA (N100)
Check RF control lines
during RX slot :
R502 = 0-1,2V typ.
R514 = 0-2,3V max.
Yes
Check analog data signals during
RX slot :
R507 (RxIN, COBBA) = 0-1,5V
C514 (RxIP, COBBA) = 0-1,5V
Recieved signals is biased to 1,2
DC, nominal amplitude = 125-450
mVpp AC
If DC error : Check COBBA (N100)
else :
Check RF part.
Check RF control lines during TX slot :
J503 (TxP, MAD2) = "0"<->"1" (2,8V)
R518 (TxC, COBBA) = 0-2,3V max.
If TxC error :
Check COBBA (N100)
If TxP error :
Check MAD2 (D300)
Check analog data signals during
TX slot :
TxIN, COBBA
TxIP, COBBA
TxQN, COBBA
TxQP, COBBA
Transmitted signals is biased to
DC, nominal amplitude = 300
mVpp, freq. = 64 kHz
Check COBBA (N100)
Check RF part.
Yes
No
Yes
Yes
No
No
Yes
Yes
No

NPB-1NB
Baseband Troubleshooting PAMS Technical Documentation
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"Insert SIM card"
Voltage < 1,5 V on
R220 towards C236
when BSI resistor is
connected
Check X203, R221, R220
and C236.
Vsim, DATA, RST
and CLK lines rises to
5V after power ON
Check X400, R213, C221,
C222, C222, C224, C225.
SIMIF(4:0) lines :
J202, J204, J205, J206 rises to 2,8V
after power ON
Defective CCONT
(N201) or PCB
Yes
Yes
Yes
No
No
No
Defective MAD2 (D300)

PAMS Technical Documentation Baseband Troubleshooting
NPB-1NB
,VVXH)HE 1RNLD0RELOH3KRQHV/WG 3DJH
 6,0FDUGUHMHFWHGHUURU
"SIM card rejected"
Vsim according to spec.:
2,8V min. (3V SIM card)
4,5V min. (5V SIM card) Defective CCONT (N201)
ATR data can be
seen at C222 towards
R213 Check X400 and R213
Check CCONT (N201)
Yes
Yes
No
No
J206 (SIMI/O_C line) is 1
during ATR meassage
ATR data can be
seen at SIMIF4 (J202)
Check MAD2 (D300)
No
No
Check CCONT (N201)
Yes
Yes

NPB-1NB
Baseband Troubleshooting PAMS Technical Documentation
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Earpiece doesn’t work
and there aren’t any
electrical or mechanical
problems
Check R119, R120, C122,
C105, C125, C104, C126,
Replace COBBA
(N100)
OK
OK
Microphone doesn’t work
and there aren’t any
electrical or mechanical
problems.
C115 towards R115 (bias)
= 2,1V
Check mic-line to
COBBA :
L402, C403, C407,
C120, R111.
OK
Yes
Check R115, V101,
C123, C113.
Replace COBBA
(N100)
No