Trouble Shooting Guide, Advanced
4/00021-3/FEA 209 544/25 C
Ericsson Mobile Communications AB
3(78)
1.4
Abbreviations
B: Crystal.
C: Capacitor.
D: Digital circuit.
H: Buzzer, LED, and pads for display.
J:
Connector.
L: Coil.
N: Analogue circuit, power amplifier at some units.
R: Resistor.
S: Keyboard pads.
U: Balun, component that converts a balanced signals to unbalance or vices versa.
V: Transistor, diode.
X: Contact surface on the circuit board.
Z: Filter.
DCIO:
DC voltage through the system connector for charging.
GND:
Ground.
RTC:
Real Time Clock, the clock that keeps track of time.
SIMCONCLK: Signal from the processor used for communication to SIM, clock-signal.
SIMCONDAT: Signal from the processor used for communication to SIM, data-signal.
SIMCONRST: Signal from the processor used for communication to SIM, reset-signal.
SIM VCC:
Feed voltage for SIM, 5.0
±
0.10 V
DC.
VBATT:
Battery voltage, 3.70
±
0.5 V
DC.
VPPFLASH: Voltage to erase and program the memory. 12.0
±
0.60 V
DC
VCORE:
DC voltage for the processor 2.4
±
0.10 V
DC.
VCORE DSP: DC voltage for the DSP 1.8
±
0.10 V
DC.
VDIG:
DC voltage for the processor and memory, 2.75
±
0.10 V
DC.
VLCD:
DC voltage for the display that controls the contrast, the voltage is generated in
the display-assembly.
VHOM:
DC voltage for the radio part except the synthesiser, 3.8
±
0.20 V
DC.
VRAD:
DC voltage for the radio part, 3.8
±
0.20 V
DC.
V380B:
DC voltage for the radio part, 3.8
±
0.20 V
DC.
VRTC:
DC voltage for the real time clock, 2.35
±
0.15 V
DC.
VVCO:
DC voltage for the synthesiser, 3.8
±
0.10 V
DC.
I2C:
Communications-standard for two-way communication using only 2 wires.