T18sre~1.pdf

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T18s, T18sc Standard Electrical Repairs
Approved according to 1776-2/FEA 209 544
Trouble-shooting
instruction
T18s, T18sc
Standard electrical repairs
4/00021-2/FEA 209 544/12.B
T18s, T18sc Standard Electrical Repairs
Table of contents
1
2
3
4
5
6
7
8
9
10
11
Conditions
..........................................................................................
3
No SERV/Not able to connect calls.
...............................................
6
Doesn’t start.
...................................................................................
12
Audio.
...............................................................................................
21
Display.
............................................................................................
30
Charging fault
.................................................................................
34
SIM fault ("Insert card")
...............................................................
38
Keyboard
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45
Illumination, buzzer and vibrator.
................................................
48
RTC
..................................................................................................
57
Component list
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59
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T18s, T18sc Standard Electrical Repairs
1 Conditions
1.1 Component classifications.
After each component, which fault can be verified by the trouble-shooting instruc-
tions in this folder, the classification of the component is written. The components
are divided into four classes, A,B,C and D. The classes are seperated depending on
how much of the prestanda of the phone that is affected by replacing the component.
Class A and B:Replacing
the component doesn´t affect the prestanda that much,
you only have to do a test call towards a real network before you per-
form a function test after the exchange.
Class C:
The phone has to be calibrated at station level after replacing the com-
ponent, since the components tolerances are so large it can affect the
prestanda of the phone.
It demands advanced equipment and calibration at board level and
because of that class D-components won´t be replaced.
Class D:
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T18s, T18sc Standard Electrical Repairs
1.2 Abbreviations.
A:
B:
C:
D:
F:
G:
H:
J:
L:
N:
R:
S:
U:
V:
X:
Z:
The power module at some phones.
Crystal.
Capacitor.
Digital circuit.
Over voltage protection.
VCO.
Buzzer, LED, pads for display.
Connector.
Coil.
Analogue circuit, the power module at some phones.
Resistor.
Keyboard pads.
BALUN. A circuit that converts a signal from balanced to unbalanced or the
opposite.
Transistor or diode.
Contact surface at the circuit board.
Filter.
AGND:
DCIO:
DCON:
Ground for analogue signals.
DC voltage used for charging the battery through the system connector.
Logical signal from the processor that keeps the phone running after
you’ve released the On/Off key.
EXTAUD: Input signal at the system connector that the processor uses to deter-
mine if there’s any external audio equipment attached.
EXTAUDI: The same signal as the EXTAUD signal but at the processor side.
GND:
Ground.
LED1G and LED2R:Logical signal used to activate the green or red top indicator.
LED3K:
ONSRQ:
PORTHF:
PHF1:
REGON:
Logical signal used to activate the background illumination.
Voltage from the On/Off key that starts the phone.
Input signal at the system connector that the processor uses to deter-
mine if there’s any handsfree equipment attached.
The same signal as PORTHF but at the processor side.
Logical signal that activates the voltage regulators.
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T18s, T18sc Standard Electrical Repairs
RTC:
SIMCLK:
SIMDAT:
SIMRST:
SIMVCC:
VBATT:
VBUZZ:
VCORE:
VDIG:
VLCD:
Real time clock. The clock that keeps track of time and date.
Clock signal from the processor, through D901, used for communica-
tions with the SIM.
Data signal from the processor, through D901, used for communica-
tions with the SIM.
Reset signal from the processor, through D901, used for communica-
tions with the SIM.
The up switched VDIG, 5 V (in D901), used for the SIM.
Battery voltage, 4.8 V.
Feed voltage to the voltage transformer for the display (becomes
VLCD and VLCDMEAS).
Feed voltage to D600 and D900, 2.5 V.
DC voltage for the processor and memory, 3.2 V.
DC voltage for the display that controls the contrast.
VLCDMEAS:The same as above, but is used in N800 to measure the voltage.
VRAD:
VRPAD:
VRTC:
VVCO:
VVIC:
DC voltage for the radio part except the synthesizer, 3.8 V.
DC voltage for the radio part in D600, 3.2 V.
DC voltage for the real time clock, 3.1 V, also existing when the phone
is powered off..
DC voltage for the synthesizer, 3.8 V.
Feed voltage to D901 (SIM-controller circuit), 3.2 V).
I
2
C:
LO:
PWM:
Two line serial communications standard using one clock and one data
line.
Local oscillator.
Pulse width modulation.
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