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1.3 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.
R:
Resistor.
U:
BALUN. A circuit that converts a signal from balanced to unbalanced or the
opposite.
V:
Transistor or diode.
X:
Antenna connection, contact surface at the circuit board.
Z:
Filter
AGND:
Ground for analogue signals.
DCIO:
DC voltage used for charging the battery through the system connector.
DCON:
Logical signal from the processor that keeps the phone running after
you´ve released the On/Off key.
GND:
Ground.
LED3K:
Logical signal used to activate the background illumination.
ONSRQ:
Voltage from the On/Off key that starts the phone.
REGON:
Logical signal that activates the voltage regulators.
RTC:
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: Feed voltage for the SIM.
SWDC:
Switched VBATT.
VANA:
DC voltage for the analogue part of the logic (N800).
4/00021-2/FEA 209 544/3.D
SH888, S868, Standare Electrical Repair
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