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PF768, Standard Electrical Repairs
Approved according to 2/FEA 209 544
Trouble-shooting
instruction
PF 768
Standard electrical repairs
4/00021-2/FEA 209 544/11.C
PF768, Standard Electrical Repairs
Table of contents
1
Conditions
..........................................................................................
3
1.1
1.2
1.3
Component classes.
.........................................................................
3
Abbreviations.
.................................................................................
4
Pin placements
................................................................................
6
2
3
4
5
6
7
8
9
10
No serv/not able to connect calls.
.....................................................
8
Doesn’t start.
...................................................................................
11
Audio.
...............................................................................................
21
Display.
............................................................................................
29
SIM (“Insert card”).
.......................................................................
33
Keyboard
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37
Illumination and buzzer.
................................................................
42
RTC
..................................................................................................
50
Component lists
...............................................................................
52
10.1
10.2
10.3
10.4
Explanations
..................................................................................
Component list 2/ROA 117 3235/2
.............................................
Mounting drawing table
..............................................................
Revision change table
...................................................................
52
53
67
67
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PF768, Standard Electrical Repairs
1 Conditions
1.1 Component classes.
All the components in the phone are divided into classes and after every component
in the troubleshooting guide you have a class written. The components are divided
into four classes: A, B, C and D.The class of the component depends on how much
of the phone’s performance is affected when replacing it.
Class A and B:A
test call towards the “real” net (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 components
need to be calibrated
at
board level
using very
advanced equipment and may therefore
not be replaced.
Class D:
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PF768, 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.
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:
LED3K:
ONSRQ:
PORTHF:
PHF1:
REGON:
RTC:
Ground.
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.
Real time clock. The clock that keeps track of time and date.
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PF768, Standard Electrical Repairs
SIMCLK:
SIMDAT:
SIMRST:
SIMVCC:
SWDC:
VANA:
VBATT:
VDIG:
VDSP:
VLCD:
VRAD:
VRPAD:
VRTC:
Clock signal from the processor used for communications with the
SIM.
Data signal from the processor used for communications with the SIM.
Reset signal from the processor used for communications with the
SIM.
Feed voltage for the SIM.
Switched VBATT.
DC voltage for the analogue part of the logic (N800).
Battery voltage.
DC voltage for the processor and memory.
DC voltage for the DSP (Digital Signal Processor).
DC voltage for the display that controls the contrast.
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.
VSIMPAD: VDIG voltage that has been switched up to 5V used for SIM.
VVCO:
DC voltage for the synthesizer.
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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