Trouble Shooting Guide, Standard
4/00021-2/FEA 209 544/31 B 2(23)
1 Explanations
For component placing see doc.1078-2/FEA 209 544/31.
1.1 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.
S: Keyboard pads.
U: BALUN Component that converts a balanced signal to unbalanced or the other way
around.
V: Transistor, diode.
X: Contact surface on the circuit board.
Z: Filter.
DCIO: DC voltage through the system connector for charging.
GND: Ground.
LED3K: Signal that activates the background illumination.
ONSWAn: Voltage from the On/Off key that starts the phone.
RTC: Real Time Clock. Clock that keeps track of the time.
SIMCLK: Signal from the processor used for communication to SIM, clock signal.
SIMDAT: Signal from the processor used for communication to SIM, data signal.
SIMRST: Signal from the processor used for communication to SIM, reset signal.
SIMVCC: Feed voltage for SIM.
VBATT: Battery voltage.
VCORE: DC voltage for the processor and memory at, for instance, stand by mode.
Lower than VDIG.
VDIG: DC voltage for the processor and memory.
VDSPC: DC voltage for the DSP (Digital Signal Processor).
VLCD: DC voltage that controls the contrast for the display.
VRAD: DC voltage for the radio part except for the synthesizer.
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