A2618-instr-serwis.pdf

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Trouble Shooting Guide, Standard
Trouble Shooting Guide, Standard
Applicable for A2618s and A2618sc
Contents
1
2
3
4
5
6
7
8
9
10
11
12
13
Explanations ....................................................................................................................2
Network Problems...........................................................................................................5
On/Off Problems .............................................................................................................8
Audio Problems .............................................................................................................10
Display/Illumination Problems ....................................................................................13
Capacity/Charging Problems.......................................................................................17
SIM Problems................................................................................................................18
Key Problems.................................................................................................................20
Alert Problems...............................................................................................................21
Data Communication Problems...................................................................................22
Software Problems ........................................................................................................22
Other Problems .............................................................................................................23
Revision History ............................................................................................................24
4/00021-2/FEA 209 544/25 A
Approved according to 1776-2/FEA 209 544
Trouble Shooting Guide, Standard
1 Explanations
1.1
Component Placement Reference
For component placement see doc.1078-2/FEA 209 544/25
1.2
Service Test Menu
Code to enter Service Test Menu, > * < < * < *
1.3
External connectors
External units are connected to the transceiver by means of an 11-pin connector on the bottom
of the phone.
The pin numbering is starting from the right when looking on the system connector with the
front up.
Pin
1
Signal
DCIO
Function
DC+ pole for charging phone battery and external
accessory powering.
Digital GND and DC return.
Flash memory Vpp /Service.
Audio signal GND, 0 V reference.
Accessory Control From Mobile Station serial (ACB)
communication/ Portable Hands Free Sense.
Accessory Control To Mobile Station serial (ACB)
communication.
Data From Mobile Station, serial bus communication.
Data To Mobile Station, serial bus communication/
External accessory Power on
Mobile station Clear To Send/ ON REQuest
Audio from Mobile station/ Ready To Send
Audio to Mobile station
2
3
4
5
GND
VPPFLASH
GND
CFMS_PHFS
6
CTMS
7
8
DFMS
DTMS
9
10
11
CTS_ON
AFMS/RTS
ATMS
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Trouble Shooting Guide, Standard
1.4
Abbreviations
B: Crystal.
C: Capacitor.
D: Digital circuit.
H: Buzzer, LED, and pads for display.
J: Connector.
L: Coil.
N: Analogue circuit, power amplifier at some units.
R: Resistor.
S: Keyboard pads.
V: Transistor, diode.
X: Contact surface on the circuit board.
Z: Filter.
DCIO:
GND:
RTC:
DC voltage through the system connector for charging.
Ground.
Real Time Clock, the clock that keeps track of time.
SIMCONCLK: Signal from the processor used for communication to SIM, clock-signal.
SIMDCONAT: Signal from the processor used for communication to SIM, data-signal.
SIMCONRST: Signal from the processor used for communication to SIM, reset-signal.
SIM VCC:
VBATT:
Feed voltage for SIM, 5.0
±
0.10 V
DC.
Battery voltage, 3.70
±
0.5 V
DC.
DC voltage for the processor 2.4
±
0.10 V
DC.
DC voltage for the processor and memory, 2.75
±
0.10 V
DC.
DC voltage for the display that controls the contrast, the voltage is generated in
the display-assembly.
DC voltage for the radio part except the synthesiser, 3.8
±
0.20 V
DC.
DC voltage for the radio part, 3.8
±
0.20 V
DC.
DC voltage for the radio part, 3.8
±
0.20 V
DC.
DC voltage for the real time clock, 2.35
±
0.15 V
DC.
DC voltage for the synthesiser, 3.8
±
0.10 V
DC.
Communications standard for two-way communication using only 2 wires.
What the mobile telephone later in this document will be called.
VPPFLASH: Voltage to erase and program the memory. 12.0
±
0.60 V
DC
VCORE:
VCORE DSP: DC voltage for the DSP 1.8
±
0.10 V
DC.
VDIG:
VLCD:
VHOM:
VRAD:
V380B:
VRTC:
VVCO:
I
2
C:
Unit:
4/00021-2/FEA 209 544/25 A
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Trouble Shooting Guide, Standard
1.5
Pin placement
Single diode (PIN diode)
Electrolytic capacitor.
Double diode or single
transistor
Five pin circuit (usually volt-
age regulator).
Double transistor.
N392
Eight pin circuit.
N200
N400
Crystal
N300
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Trouble Shooting Guide, Standard
2 Network Problems
2.1
Find out if the fault is RX- or TX-related
Connect the unit (with signalling program) to a GSM test instrument and try to get
SERV at an input signal strength of -68.5 dBm.
If the unit does not get SERV, go to section 2.2.
If the unit gets SERV, go to section 2.4.
2.2
The phone does not get SERV
Open the unit and check for liquid damage.
No action is to be taken for a liquid damaged unit,
send the unit on according to the local
company directives.
Make sure that the antenna connector W1 not is mechanically damaged, dirty or oxidised.
Clean it if needed.
Check the soldering of N200, N201, Z200 and Z201.
Measure the resistance over L202, L203, L204 and L206 (0 ohm).
Measure the resistance over L200, L201 (0 ohm) and R202 (270 ohm).
Replace if incorrect.
Retry to get SERV again with the settings mentioned above.
If the unit gets SERV, go to section 2.4.
If the unit still does not get SERV, the fault probably is within the LO part, or the losses in the
signal path are too large.
It is also possible that the feed voltages are incorrect, section 2.3.
Open the unit.
Power up the board and start it by pressing the On/Off key.
Measure the VRAD-voltage on C705, measure on the side close to C706.
If the voltage is incorrect, send the unit on according to the local company directives.
Measure the V380B-voltage on C706, measure on the side close to R705.
If the voltage is incorrect, send the unit on according to the local company directives.
If the voltage is correct, measure the VVCO-voltage on pin 5 of N701.
If the VVCO-voltage is correct, measure the resistances over R362 (18 kohms) and R392 (82
ohms).
If the resistances are incorrect, replace the corresponding component.
If both the resistances are correct, go to section 2.3.
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