TROUBL, ---SCHEMATY---GSM

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PAMS Technical Documentation
NSB–1/3 Series Transceivers
Troubleshooting
Instructions
Original 06/98
NSB–1/3
Troubleshooting Instructions
PAMS
Technical Documentation
CONTENTS
Page No
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phone is totally dead
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash programming doesn’t work
4
. . . . . . . . . . . . . . . . . . . . . . .
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash Programming failure (2)
6
. . . . . . . . . . . . . . . . . . . . . . .
Power doesn’t stay on, or phone is jammed
7
. . . . . . . . . . . . . .
8
. . . . . . . . . . . . . . . . . . . .
The phone doesn’t register to the network or phone doesn’t make a call
9
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instructions for RX troubleshooting
11
. . . . . . . . . . . . . . . . . . .
12
. . . . . . . . . . . . . . . . . . .
Fault finding chart for 13 MHz oscillator
14
. . . . . . . . . . . . . . .
16
Fault finding chart for VHF VCO
. . . . . . . . . . . . . . . . . . . . . .
17
Fault finding chart for UHF VCO
. . . . . . . . . . . . . . . . . . . . . .
18
SIM card is out of order
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
SIM Card failure
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
Audio failure (1)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
Audio failure (2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
Charger failure
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
Page 2
Original 06/98
Trouble Shooting
Flash Programming (1)
Display Information: Contact Service
Phone register failure
Instructions for TX troubleshooting
PAMS
Technical Documentation
NSB–1/3
Troubleshooting Instructions
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. 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. En-
sure in particular that:
a) there are not any mechanical damages
b) soldered joints are OK
Original 06/98
Page 3
NSB–1/3
Troubleshooting Instructions
PAMS
Technical Documentation
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 (X001 pin 11) is grounded.
Used battery voltage must be higher than 3.0 V. Otherwise the hardware
of CCONT (N100) prevents totally to switch power on.
Phone is totally dead
YES
Check VBATT at CCONT
(N100 pins 8,12,...) =3.6V
NO
Failure in VBAT line
Check X101, X102
YES
Voltage at pin 29 of CCONT (N100)
is 3.6 V
NO
Faulty circuit N100
YES
N100 pin 55 (VBB) 2.8 V
N100 pin 25 (VXO) 2.8 V
when PWR switch is pressed
or watchdog disable pin is grounded
NO
CCONT (N100) pin 29 0V when
PWR switch is pressed or
watchdog disable is grounded
NO
Check X99,R103
Check UI module
YES
YES
See section: Power Doesn’t Stay On
Faulty circuit N100
Flash programming doesn’t work
There are two possibilities to route programming voltage VPP.
– If regulator N200 is used the programming voltage comes from the reg-
ulator (VPPSW) via UI–connector to flash memory D210.
– Other way is to route Vpp from CCONT pin36 to UI–connector and
again to flash memory.
In flash programming error cases the flash prommer can give some in-
formation 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
Page 4
Original 06/98
PAMS
Technical Documentation
NSB–1/3
Troubleshooting Instructions
In cases that the flash programming doesn’t succeed there is a possibility
to check short circuits between the memories and the MCU (MAD2).
This test is useful to do, when the fault information is: MCU doesn’t boot,
Serial clock line failure or Serial data line failure.
The test procedure is following:
1. Connect the short circuit wire between the test points J206 and J207.
2. Switch power on
3. If the voltage level in testpoint J205 is 2.8 V (”1”), the interface is OK. If
there is a short circuit, the voltage level in testpoint J205 stays low and
32kHz square wave signal can be seen in the lines which are already
tested.
This test can only be used to find short circuits, not open pins. Also upper
data lines (15:8) of flash circuit D210 are not included to this test.
CCONT pin 54
( PURX )
MAD pin 38
( MCUAD0)
selftest
passed
MAD pin 134
( ExtSysResX))
J205
Original 06/98
Page 5
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