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PF768, Standard Electrical Repairs
1.2 Abbreviations.
A:
The power module at some phones.
B:
Crystal.
C:
Capacitor.
D:
Digital circuit.
F:
Over voltage protection.
G:
VCO.
H:
Buzzer, LED, pads for display.
J:
Connector.
L:
Coil.
N:
Analogue circuit.
R:
Resistor.
S:
Keyboard pads.
U:
BALUN. A circuit that converts a signal from balanced to unbalanced or the
opposite.
V:
Transistor or diode.
X:
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.
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.
LED3K:
Logical signal used to activate the background illumination.
ONSRQ:
Voltage from the On/Off key that starts the phone.
PORTHF:
Input signal at the system connector that the processor uses to deter-
mine if there's any handsfree equipment attached.
PHF1:
The same signal as PORTHF but at the processor side.
REGON:
Logical signal that activates the voltage regulators.
RTC:
Real time clock. The clock that keeps track of time and date.
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