BBBaseband
DCDirect Current
ESDElectro Static Dicharge
f:Frequency of signal (measured with Spectrum Analyzer)
LOLocal Oscillator
P:Power of signal –dB) (measured with Spectrum Analyzer)
PAPower Amplifier
PCBPrinted Circuit Board
PLLPhase Locked Loop
RFRadio Frequency
Troubleshooting
RXReceiver
T:Time between pulses
TXTransmitter
UHF Ultra High Frequency
V:Voltage of signal (measured with oscilloscope)
VCOVoltage controlled oscillator
VHFVery High Frequency
Issue 1 07/99
Page 3
NSE–8/9
PAMS
Troubleshooting
Technical Documentation
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)there is not any mechanical damage (especially battery connector X101, X102)
b)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:
–TDS–7 ( Service battery )
–MJS–13 ( Module repair Jig )
The diagnostics on the following pages assumes that the tranceiver bd. Is placed in
the MJS–13 jig.
Page 4
Issue 1 07/99
PAMS
NSE–8/9
Technical Documentation
Troubleshooting
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
Yes
Measure Vdc_out
voltage
at Vibra pad E103
> 1,9 V
No
Failure in VB.
Check X101, X102 and
Jig or tester
Voltages OK?
Yes
Power doesn’t stay on.
Measure voltage at
2,85v>C117 (Vbb) > 2.7V
2,85V >C102 (VXO) > 2.7V
When PWR switch is pressed or
WDOGDISABLE is grounded.
Measure ”PWRON” voltage at R413
No
Yes
when pwr–switch (S416) is pressed or
Yes
WDDIS is grounded
(R424 connected to gnd).
Voltage less than 0,5V
(Will be low only during
power–up of CCONT
if power switch
is pressed.)
> 3.1V
No
Switcher
Figure 4–1
Issue 1 07/99
– PCB
Faulty:
– 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
Page 5
NSE–8/9
PAMS
Troubleshooting
Check voltage at
C109
less than 4,8 V
> 3.1 V
No
Switcher
No
Yes
Technical Documentation
Switcher feedback
somehow faulty
check circuitry arround
V105, V108, V109
Check L103 and
capacitors
C111 to C113
Check voltage at
pin 3 of V105
< 0,4 V
No
Check
L102, V101 and
circuitry arround
V109
Yes
Check capacitors C109
to
C113 and coil L103
Yes
Measure voltage
at V105 pin 15
app. 1.25 V
No
Check feedback circuitry
R102, R105, R112
and arround
V108. Or replace V105
Figure 4–2
4.2. Flash programming doesn’t work
The flash programming can be done via panel connector X201 or via service interface J100 - J105.
Page 6
Issue 1 07/99
PAMS
NSE–8/9
Technical Documentation
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 4–3, Figure
4–4 and Figure 4–5.
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
Troubleshooting
Issue 1 07/99
Page 7
NSE–8/9
PAMS
Troubleshooting
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
failure is one of the
above mentioned?
Connect watchdog disable
(WDDIS R424 ) to GND.
Technical Documentation
FLASH Programming
doesn’t work.
No
A
Yes
Check WDDIS line:
X201 pin 11 –> R424
No
C117 (Vbb) is typ 2.8V
C102 (VXO) is typ 2.8V
C
Master RESET
(PURX R303) is ”1” (2.8V)
after ca. 62ms
Yes
Yes
B
13MHz clock
C301 towards MAD
500mVpp min.
Yes
and
?
See section ”Phone is
totally dead”.
No
Check sleep clock
(R118 end towards CCONT )
32kHz square wave
No
NoYes
RFC 13MHz
800mV min.
V702 collector
Line OK?
No
Yes
NoYes
Faulty PCB
Check sleep clock circuit.
R121, R122, R123, R124,
C147, C148, C153, B100
and C149
Faulty N100 or
overloaded PURX line
Page 8
Check R727, V702,
R728, R714, G701
Figure 4–3
Check
R743 & C301
Issue 1 07/99
PAMS
NSE–8/9
Technical Documentation
B
Check that the following lines are OK:
FCLK (M–BUS) 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 pull–up and –down resistors: R309, R310, R311
GND: J100, X201 pin 7 –> GND
OK?Repair or defect PCB
Troubleshooting
No
Yes
Check Service tool
TDS–7 & MJS–13
and
connections
Check that phone is
responding to flash
programming tool as
shown in fig. 4–3 to 4–5
MAD or FLASH faulty.
Figure 4–4
Issue 1 07/99
Page 9
NSE–8/9
PAMS
Troubleshooting
A
External RAM fault?
Yes
Check pins of SRAM (D302)
Check control lines of SRAM:”MEMC(4:0)”
Technical Documentation
No
ID problem?
NO
Yes
Check type of FLASH
Check soldering of FLASH
Unknown fault. Check for noise on
communication lines
Try phone totally dead.
Check connection from
J105 to R307
Voltage at
R307 >1.7V & <3.6V
during flashing?
Yes
No
Yes
MCU FLASH Vpp
Error
No
Voltage at R307 12V +/–
5% during flashing?
Yes
Flashing from
X201?
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
Vpp outside supported
YesNo
range.
Page 10
Defect FLASH or
flashing–SW has wrong
version.
Figure 4–5
Issue 1 07/99
PAMS
NSE–8/9
Technical Documentation
Troubleshooting
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).
Issue 1 07/99
Page 11
NSE–8/9
PAMS
Troubleshooting
Power doesn’t stay on or
phone is jammed
C109 voltage <4,2V or
>3,1V ?
Check that
CCONTCSX J337
is pulsing and that PWRON
(R413) is high.
Is
Yes
Yes
Technical Documentation
No
Software is able to run in phone,
acknowledging watchdog.
If power is switched off after a few
seconds, check circuit arround V109.
Switcher
No
Connect R424 to GND
Check
VBB typ 2.8V at C117
and
VXO typ 2.8V at C102
and that they are
stable
Yes
C
Figure 4–6
Power doesn’t
stay on or phone is
jammed in idle
or call mode
Call
No
Is
Vdc_out stable
and within
limits?
Yes
N100 circuitry is faulty
No call
Switcher
Call
No
Switcher
Page 12
The LABEL “C” refers to Figure 4–3, The Label “Switcher” referes to Figure 4–2
Issue 1 07/99
PAMS
NSE–8/9
Technical Documentation
Troubleshooting
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 4–7, Figure 4–8, Figure 4–9 and Figure 4–10).
1. DSP initialization
done
2.Synchronization to
networknetwork
Network done
123
3. Registration to
Network done.
MAD2Pr1 pin D8
(DSPXF)
J308
The states of DSP (MAD2) after power on
Figure 4–7
Issue 1 07/99
Page 13
NSE–8/9
PAMS
Troubleshooting
1
init
initialize
The states of DSP after power on
Figure 4–8
patch code
download
dsp
constants
download
initializatio
done
n
Technical Documentation
MAD2Pr1 pin D8
(DSPXF)
J308
PSW
searchlast PSW
channel
scan starts
The states of DSP after power on
Figure 4–9
send RACH
RACH OK
2
3
go SDCCH
imediate
OK
assigment
OK
synchronizatio
OK
n
MAD2Pr1 pin D8
(DSPXF)
J308
MAD2Pr1 pin D8
(DSPXF)
The states of DSP after power on
Figure 4–10
Page 14
J308
Issue 1 07/99
PAMS
NSE–8/9
Technical Documentation
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
?
Yes
Analog reference
to COBBA is 1.5V
(C205) and stable
?
Yes
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
Troubleshooting
No
Check N100
No
Check R207, C205, C123
and C124.
Check Vref and load on it
All OK?
Yes
Synthesizer lines:
SEna1R724
SClkR722
SDataR722
Pulses 0–>1 during receiving slot
All OK ?
Yes
D
No
Check N100, D300 and load in
RFon defective lines
No
Check D300
Figure 4–11
Issue 1 07/99
Page 15
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