TROUBLE, ---SCHEMATY---GSM
[ Pobierz całość w formacie PDF ]PAMS Technical Documentation
NSE–5 Series Transceivers
Troubleshooting
Issue 1 07/99
NSE–5
Troubleshooting
PAMS
Technical Documentation
Contents
Page No
Baseband
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Phone is totally dead
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Flash programming doesn’t work
4
. . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Power doesn’t stay on or phone is jammed
5
. . . . . . . . . . . . . . . . . .
9
. . . . . . . . . . . . . . . . . . . . . . .
5. The phone doesn’t register to the network
11
. . . . . . . . . . . . . . . . . . .
11
6. SIM card is out of order
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
7. Audio Faults
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Uplink/Downlink Problem
17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Downlink Problem
18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
8. Charging Faults
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 Seems Dead
19
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 Display Problem
19
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
Rf Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Abbreviations in fault finding charts
21
. . . . . . . . . . . . . . . . . . . . . . . . . . .
22
GSM Receiver
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GSM Transmitter
26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
PCN Transmitter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
Synthesizers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
UHF VCO
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37
Page 2
Issue 1 07/99
4. Display Information: Contact Service
7.1 Uplink Problem
PCN Receiver
PAMS
Technical Documentation
NSE–5
Troubleshooting
TroubleShooting
Baseband
The following hints should facilitate finding the cause of the problem when
the circuitry seems to be faulty. This troubleshooting instruction is divided
following section.
1. Phone is totally dead
2. Flash programming doesn‘t work
3. Power doesn‘t stay on or the phone is jammed
4. Display information: Contact Service
5. Phone doesn‘t register to the network or phone doesn‘t make a call.
6. Plug in SIM card is out of order ( insert SIM card or card rejected).
7. Audio fault.
8. Charging fault
The first thing to do is carry out a through visual check of the module.
Ensure in particular that:
a) there are not any mechanical damages
b) soldered joints are OK
Note
:X201 is a connection that is ONLY present in the production. Therefore it is not applicable for the
PAMS repair.
Issue 1 07/99
Page 3
NSE–5
Troubleshooting
PAMS
Technical Documentation
1. Phone is totally dead
This means that phone doesn’t take current at all when the power switch
is pressed (X400 pin 7) or when the watchdog disable pin (X201 pin 11) is
grounded. Used battery voltage must be higher than 3.1 V. Otherwise the
hardware of CCONT (N100) prevents totally to switch power on.
Phone is totally dead.
Measure voltage at
C155 (VBAT)
Measure voltage at
C153
Ye s
3.6V
Ye s
3.6V
No
Measure voltage at V113 pin 4
(Vbb) 2.8V
C112 (end towards bottom) (VXO)
2.8V
When PWR switch is pressed or
WDOGDISABLE is grounded.
No
Failure in VBAT.
Check X101, X102,
L103, L102, R102
Faulty PCB
Voltages OK?
No
Measure voltage at R413 (end
towards edge) when pwr–switch
(X400 pin 7) is pressed or
WDOGDISABLE (X201 pin 11)
is grounded.
Ye s
0V
(Will be low only during
power–up of CCONT if
power switch is pressed.)
Ye s
Power doesn’t stay on.
No
Faulty PCB
Check R413, V410
Check LCD–module
Check WDOGDISABLE line
Figure 1.
Page 4
Issue 1 07/99
PAMS
Technical Documentation
NSE–5
Troubleshooting
2. Flash programming doesn’t work
The flash programming can be done via panel connector X201 or via
system connector X200.
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 system connector X200.
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 the next
three figures
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
Issue 1 07/99
Page 5
[ Pobierz całość w formacie PDF ]