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4/00021-2/FEA 209 544/6 C
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 determine 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 determine 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.
SIMCLK:
Clock signal from the processor used for communications with the SIM.
SIMDAT:
Data signal from the processor used for communications with the SIM.
SIMRST:
Reset signal from the processor used for communications with the SIM.
SIMVCC:
Feed voltage for the SIM.
SWDC:
Switched VBATT.
VANA:
DC voltage for the analogue part of the logic (N800).
VBATT:
Battery voltage.
VDIG:
DC voltage for the processor and memory.
VDSP:
DC voltage for the DSP (Digital Signal Processor).
VLCD:
DC voltage for the display that controls the contrast.
VRAD:
DC voltage for the radio part except the synthesizer.
VRPAD:
DC voltage for the radio part in D600 (also used for the top diode and the buzzer).
VRTC:
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.
2
I
C:
Two line serial communications standard using one clock and one data line.
LO:
Local oscillator.
PWM:
Pulse width modulation.
Abbreviations.
Troubleshooting guide
3
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- Charging
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