Ericsson A1018S Guide

Approved according to 1776-2/FEA 209 544
Trouble-shooting
instruction
A1018s/A1018sc
Standard electrical repairs
4/00021-2/FEA 209 544/16.B
A1018s/A1018sc Standard Electrical Repair

A1018s/A1018sc Standard Electrical Repair
4/00021-2/FEA 209 544/16.B 2(42)
Table of contents
1 Conditions .......................................................................................... 3
1.1 Component classes. ......................................................................... 3
1.2 Abbreviations .................................................................................. 4
2 No serv / not able to connect calls. ................................................... 5
3 Doesn´t start. ..................................................................................... 8
4 Audiofel ............................................................................................ 13
5 Display ............................................................................................. 21
6 Charging .......................................................................................... 24
7 SIM fault .......................................................................................... 26
8 Keyboard ......................................................................................... 28
9 Illumination and buzzer ................................................................. 32
10 RTC .................................................................................................. 40
11 Component lists ............................................................................... 42

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1 Conditions
1.1 Component classes.
All the components of the board are divided into four classes: A, B, C and D. The
class of the component depends on how much of the performance of the phone is
affected when replacing it.
Class A and B: A test call towards the real network (not only towards a GSM test
instrument) and run it through the normal tests is enough to verify the functionality,
since the performance of the phone is only slightly affected.
Class C: Since the tolerances of the component are so great it can substantially
affect the performance of the phone you need to calibrate it at station level after
replacing the component.
Class D: Class D components need to be calibrated at board level using advanced
equipment and may therefore not be replaced.

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1.2 Abbreviations
B: Crystal.
C: Capacitor.
D: Digital circuit.
F: Over voltage protection.
H: Buzzer, LED, pads for display.
J: Connector.
L: Coil.
N: Analogue circuit.
P: Test point.
R: Resistor.
V: Transistor or diode.
W: Antenna connection.
X: Contact surface at the circuit board.
Z: Filter
AGND: Ground for analogue signal.
AFMS: Audio From Mobile Station
ATMS: Audio To Mobile Station
DCIO: DC voltage used for charging the battery through the system connector.
GND: Ground.
LED3K: Logical signal used to activate the background illumination.
RTC: Real time clock. The clock that keeps track of time and date.
VBATT: Battery voltage (~4.8 V).
VDIG: DC voltage for the processor and memory (3.2 V).
VCORE: DC voltage for the processor and DSP (2.5 V).
VRAD: DC voltage for the radio part (3.8 V).

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2 No serv / not able to connect calls.
2.1 Type of fault.
Connect the phone to a GSM test instrument and try to get serv at –68.5 dBm input
signal, check both bands (GSM 900 & 1800).
If the phone:
• Doesn´t get serv at any of the bands, proceed to section 2.2.
• Gets serv at GSM 900, but not at GSM 1800, proceed to section 2.3.
• Gets serv at GSM 1800, but not at GSM 900, proceed to section 2.4.
• Gets serv, but can´t connect a call at any of the bands, proceed to section 2.5.
If the phone can connect a call against the GSM instrument, but not at the real net-
work, make sure the phone isn´t locked out from the system due to theft.
2.2 The phone doesn´t get serv.
Replace the antenna and try again.
Make sure the frame of the phone isn´t mechanically damaged.
Open the phone and check for liquid damages.
Make sure the antenna connection W101 (class A, fig. 2.1) isn´t oxidised or
mechanically damaged.
Check the soldering at N202 (class C), N203 (class B) and N300 (class B)(all in
fig.2.1).
If the fault remains, send the phone to the next repair level.

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Fig. 2.1
2.3 The phone only gets serv at GSM 900.
Open the phone and check for liquid damages.
Check the soldering at N330 (class B), N332 (class B) and N202:40,41 (class C)(all
in fig.2.1).
Replace N330.
If the fault remains, send the phone to the next repair level.
2.4 The phone only gets serv at GSM 1800
Open the phone and check for liquid damages.
Measure the resistance of N203:5 (class B, fig 2.1) to ground. The resistance should
be high (>1 Mohm). If it is considerably low (a few ohm), is the fault probably due
to Z200 (class B).
Check the soldering at N331 (class B), N333 (class B) and N202:43,44 (class C)(all
in fig.2.1).
Replace N331.
If the fault remains, send the phone to the next repair level.

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2.5 The phone gets serv, but can´t connect a
call.
Open the phone and check for liquid damages.
Check the soldering at the components around N202 (class C) and N550 (class
C)(both at fig. 2.1).
If the fault remains, send the phone to the next repair level.

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3 Doesn´t start.
3.1 Type of fault.
Attach a dummy battery.
• If the phone starts automatically, proceed to section 3.2.
Press the On/Off button.
If:
• The phone starts (lights up the illumination, asks for SIM or PIN or searching for
a network), check the charging function by connecting a charger to the system
connector.
* If the charging doesn´t work, proceed to chapter 6 (“Charging”-fault).
* If the charging works, the phone probably is okay (the fault can be due to
problem with the battery).
• The phone only works as long as the On/Off button is being pressed, proceed to
section 3.3.
• The phone doesn´t start, proceed to section 3.1.1
• The fault is intermittent, proceed to section 3.4
3.1.1 Doesn´t start.
Make an outer visual check and make sure the battery screws (fig 3.1) are okay and
properly mounted.
Fig. 3.1
Keep the On/Off button pressed. Check the current consumption.
If:
• The phone doesn´t consume any current at all, proceed to section 3.5.
• The phone consumes between 1-200 mA, proceed to section 3.6.
• The phone consumes more then 200 mA, proceed to section 3.7.

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3.2 Start immediately when the battery is
attached.
Open the phone and check for liquid damages.
Make sure there is no dirt making a short circuit at the On/Off pads (”No” key, fig
3.2).
Clean if necessary, use alcohol and a brush.
Fig. 3.2
If the fault still remains, send the phone to the next repair level.
3.3 The phone works as long as the On/Off but-
ton is being pressed.
Open the phone and check for liquid damages.
Check the soldering at D600:116 (fig. 3.3).
Diode measure V702:2-3 (fig. 3.3). Replace if it is faulty.
Measure the resistance between D600:116 – V702:2 to verify an eventual foil dam-
age, in that case the board has to be discarded.
Replace D600.
If the fault still remains, send the phone to the next repair level.

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Fig. 3.3
3.4 The fault is intermittent.
Make an outer visual check and make sure the battery screws (fig 3.1) are okay and
properly mounted.
Open the phone and check for liquid damages, also make sure the connection pads
for the battery screws are clean.
Check the soldering at D600 and D610 (fig. 3.3).
If the soldering is correct and the fault remains, send the phone to the next repair
level.
3.5 The phone doesn´t consume any current at
all.
Open the phone and make a visual check of the board. Check for liquid damages on
both sides of the board, dirty or oxidised pads at the system connector and the bat-
tery connections, and if there are any obviously damaged components.