S868.pdf

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SH888, S868, Standare Electrical Repair
Approved according to 1776-2/FEA 209 544
Trouble-shooting
instruction
SH 888/S 868
Standard electrical repairs
4/00021-2/FEA 209 544/3.D
SH888, S868, Standare Electrical Repair
Table of contents
1
Conditions
..........................................................................................
3
1.1
1.2
1.3
Component classifications.
............................................................
3
Updates.
...........................................................................................
3
Abbreviations.
.................................................................................
4
2
3
4
5
6
7
8
9
10
11
12
No serv or can’t place calls.
.............................................................
6
Doesn’t start.
...................................................................................
11
Audio.
...............................................................................................
18
Display
.............................................................................................
25
Charging.
.........................................................................................
28
SIM fault
..........................................................................................
31
Keyboard.
........................................................................................
33
Illumination and buzzer.
................................................................
37
RTC
..................................................................................................
43
IRDA.
...............................................................................................
45
Component lists
...............................................................................
47
12.1
12.2
12.3
12.4
Explanation
...................................................................................
Mounting drawing tables
.............................................................
Component list SH888, S868
......................................................
Revision change table for ROA 117 3313
...................................
47
47
48
64
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SH888, S868, Standare Electrical Repair
1 Conditions
1.1 Component classifications.
All the components in the phone are divided into classes and after every component
in the troubleshooting guide you have a class written. The classification of the com-
ponent depends on how much of the phone’s performance that’s affected when
replacing it. The classes are:
Class A and B:
A test call towards the “real” net (not only a GSM test instrument)
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.
Class D:
Class D components need to be calibrated at station level using
advanced equipment and can therefore not be replaced.
1.2 Updates.
At board made in weeks 20-22 of 1998 you’ll have to replace L540 (class A,
fig.1.1).
Fig. 1.1
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SH888, S868, Standare Electrical Repair
1.3 Abbreviations.
B:
C:
D:
F:
H:
J:
L:
N:
R:
U:
V:
X:
Z:
Crystal.
Capacitor.
Digital circuit.
Over voltage protection.
Buzzer, LED, pads for display.
Connector.
Coil.
Analogue circuit.
Resistor.
BALUN. A circuit that converts a signal from balanced to unbalanced or the
opposite.
Transistor or diode.
Antenna connection, contact surface at the circuit board.
Filter
AGND:
DCIO:
DCON:
GND:
LED3K:
ONSRQ:
REGON:
RTC:
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.
Ground.
Logical signal used to activate the background illumination.
Voltage from the On/Off key that starts the phone.
Logical signal that activates the voltage regulators.
Real time clock. The clock that keeps track of time and date.
SIMCONCLK:Clock signal from the processor used for communication with the
SIM.
SIMCONDAT:Data signal from the processor used for communication with the
SIM.
SIMCONRST:Reset signal from the processor used for communication with the
SIM.
SIMVCC:
SWDC:
VANA:
Feed voltage for the SIM.
Switched VBATT.
DC voltage for the analogue part of the logic (N800).
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SH888, S868, Standare Electrical Repair
VBATT:
VDIG:
VDSP:
VDSPC:
VLCD:
VDLCD:
VRAD:
VRPAD:
VRTC:
VVCO:
Battery voltage.
DC voltage for the processor and memory (3.2V).
DC voltage for the DSP (Digital Signal Processor) (3.2V).
DC voltatge for the DSP (Digital Signal Processor) (2.5V).
DC voltage for the display the controls the contrast (-2.7V).
The feed voltage for the display.
DC voltage for the radio part except the synthesizer.
DC voltage for the radio part in D600 (also used for the top diode and
the buzzer).
DC voltage for the real time clock.
Dc voltage for the syntesizer.
I
2
C:
LO:
PWM:
Two line serial commnications standard using one clock and one data
line.
Local oscillator.
Puls width modulation.
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