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.