Ericsson_I888.pdf

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I888, Standard Electrical Repairs
Approved according to 1776-2/FEA 209 544
Trouble-shooting
instruction
I 888
Standard electrical repairs
4-00021-2/FEA 209 544/5.C
I888, Standard Electrical Repairs
Table of contents
1
2
3
4
5
6
7
8
9
10
11
12
Conditions
..........................................................................................
3
No serv or can´t place call.
...............................................................
6
Doesn´t start.
...................................................................................
10
Audio
................................................................................................
15
Display fault
....................................................................................
21
Charging fault
.................................................................................
24
SIM fault (Insert card)
...................................................................
27
Keyboard
.........................................................................................
29
Illumination and buzzer.
................................................................
33
RTC (Real Time Clock)
..................................................................
38
IRDA fault.
......................................................................................
40
Component list
.................................................................................
42
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I888, Standard Electrical Repairs
1 Conditions
1.1 Component classifications.
After each component, which fault can be verified by the troubel-shooting guides in
this folder, is the components classification written. The components are divided in
four classes, A,B,C and D. The classes are seperated depending on how much of the
phone´s prestanda that is affected by changing the component.
Class A and B:Changing
the component doesn´t affect the prestanda that much,
you only have to do a test call toward a real network before you perform a function
test after replacing it.
Class C:
The phone has to be calibrated at station level after changing the com-
ponent, since the components tolerances are so large it can affect the prestanda of
the phone.
Class D:
It demands advanced equipment and calibration at board level and
because of that class D-components can´t be replaced.
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I888, Standard Electrical Repairs
1.2
Abbreviations used in the trouble-shooting
instructions.
B: Crystal
C: Capacitor
D: Digital circuit
F: Overload protection
H: Buzzer, ligth diodes, pads to the display
J: Connection
L: Coil
N: Analouge circuit
R: Resistor
U: BALUN. Component that converts a balanced signal to a nonbalanced or the
opposit direction.
V: Transistor, diode
X: Antenna connection, contact point on the board.
Z: Filter
AGND:
DCIO:
DCON:
GND:
LED3K:
ONSRQ:
REGON:
RTC:
Ground to analouge signal
Direct current through the system connector for charging the bat-
tery.
Logical signal from the processor that keeps the phone powered on
after releasing the On/Off-button.
Ground
Logical signal that activates the illumination.
Voltage from the On/Off-button that power on the phone.
Logical signal that activates the regulator for the voltage.
Real time clock. The clock that shows the time.
SIMCONCLK: Signal from the processor that is used for communication to SIM,
clock.
SIMCONDAT: Signal from the processor that is used for communication to
SIM,data.
SIMCONRST: Signal from the processorn that is used for communication to
SIM,reset.
SIMVCC:
SWDC:
VANA:
Feed voltage to SIM.
Switch VBATT
Voltage to the analouge part of the logical circuit (N800).
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I888, Standard Electrical Repairs
VBATT:
VDIG:
VDSP:
VDSPC:
VLCD:
VDLCD:
VRAD:
VRPAD:
VRTC:
VVCO:
Voltage of the battery.
Voltage to processor and memories (3.2V).
Voltage to DSP (Digital Signal Processor) (3.2V).
Voltage to DSP (Digital Signal Processor) (2.5V).
Negative voltage to the display that controlls the contrast (-2.7V).
Feed voltage to the display.
Voltage to the radiopart except the synthesizer.
Voltage to the radiopart in D600 (used to top indicator and buzzer).
Voltage to the real time clock.
Voltage to the syntesizer.
I2C:
LO:
PWM:
Communication standard for two-way communication using only 2
wires, for clock and data.
Local oscillator.
Puls width modulation.
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