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PAMS Technical Documentation
NSE–8/9 Series Transceivers
Troubleshooting
Issue 1 07/99
NSE–8/9
Troubleshooting
PAMS
Technical Documentation
CONTENTS
Abbreviations in fault finding charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baseband Trouble Shooting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1. Phone is totally dead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2. Flash programming doesn’t work . . . . . . . . . . . . . . . . . . . . . . . . .
4.3. Power doesn’t stay on or phone is jammed . . . . . . . . . . . . . . . .
4.4. Display Information: Contact Service . . . . . . . . . . . . . . . . . . . . . .
4.5. The phone doesn’t register or phone doesn’t make a call . . . .
4.6. Plug in SIM card is out of order . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.7.Audio fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.8. Charging Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB Bottom view(GF7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB Top view (GF7 + GD7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. GSM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 .General instructions for GSM RX troubleshooting . . . . . . . . . . . . . . . .
2.2 .Path of the received GSM signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.Fault finding chart for GSM receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. PCN Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 .General instructions for PCN RX troubleshooting . . . . . . . . . . . . . . . . .
3.2 Path of the received PCN signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Fault finding chart for PCN receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. GSM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 General instructions for GSM TX troubleshooting . . . . . . . . . . . . . . . . .
4.2 Path of the transmitted GSM signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Fault finding chart for GSM transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. PCN Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 General instructions for PCN TX troubleshooting . . . . . . . . . . . . . . . . . .
5.2 Path of the transmitted PCN signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3. Fault finding chart for PCN transmitter . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Synthesizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 General instructions for Synthesizer troubleshooting . . . . . . . . . . . . . . .
6.2 13 MHz reference oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.VHF VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.UHF VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.5.Fault finding chart –UHF VCO and 13 MHz ref. oscillator . . . . . . . . . . .
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Page 2
Issue 1 07/99
PAMS
Technical Documentation
NSE–8/9
Troubleshooting
Abbreviations in fault finding charts
BB
DC
ESD
f:
LO
P:
PA
PCB
PLL
RF
RX
T:
TX
UHF
V:
VCO
VHF
Baseband
Direct Current
Electro Static Dicharge
Frequency of signal (measured with Spectrum Analyzer)
Local Oscillator
Power of signal –dB) (measured with Spectrum Analyzer)
Power Amplifier
Printed Circuit Board
Phase Locked Loop
Radio Frequency
Receiver
Time between pulses
Transmitter
Ultra High Frequency
Voltage of signal (measured with oscilloscope)
Voltage controlled oscillator
Very High Frequency
Issue 1 07/99
Page 3
NSE–8/9
Troubleshooting
PAMS
Technical Documentation
Baseband Trouble Shooting
The following hints should facilitate finding the cause of the problem when the cir-
cuitry seems to be faulty. This troubleshooting instruction is divided into the following
section.
4.1 Phone is totally dead
4.2 Flash programming doesn’t work
4.3 Power doesn’t stay on or phone is jammed
4.4 Display Information: Contact Service
4.5 The phone doesn’t register to the network or phone doesn’t make a call
4.6 Plug in SIM card is out of order ( insert SIM card or card rejected).
4.7 Audio fault.
4.8 Charging Fault
The first thing to do, is carry out a through visual check of the module.
Ensure in particular that:
a)
b)
there is not any mechanical damage (especially battery connector X101, X102)
solder joints are OK
NOTE:
X201 is a connection that is ONLY present in the production. Therefore it is
not applicable for the PAMS repair.
Service interface J100 - J105 should be used along with service tools:
–
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
Technical Documentation
NSE–8/9
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
Measure Vdc_out
voltage
at Vibra pad E103
Yes
> 1,9 V
Yes
> 3.1V
No
No
Failure in VB.
Check X101, X102 and
Jig or tester
Measure voltage at
2,85v>C117 (Vbb) > 2.7V
2,85V >C102 (VXO) > 2.7V
When PWR switch is pressed or
WDOGDISABLE is grounded.
Switcher
Voltages OK?
No
Measure ”PWRON” voltage at R413
when pwr–switch (S416) is pressed or
WDDIS is grounded
(R424 connected to gnd).
Yes
Power doesn’t stay on.
Yes
Voltage less than 0,5V
(Will be low only during
power–up of CCONT
if power switch
is pressed.)
Faulty:
– PCB
– N100 circuit
– 32KHz or RFclk osc.
– Row0 on MAD
– Insufficient supply
capability of V105 circuit
No
Check R413, V410, S416, R423
N100
Check WDDIS line
Figure 4–1
Issue 1 07/99
Page 5

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