Ericsson R320s Working Instruction page 19

1.2 Abbreviations
B: Crystal.
C: Capacitor.
D: Digital circuit.
F: Overvoltage 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 an unbalanced or the other way
around.
V: Transistor, diode.
X: Contact surface on the circuit board.
Z: Filter.
DCIO:
GND:
EL_HIGH:
EL_LOW:
ONSWAn:
RTC:
SIMCLK:
SIMDAT:
SIMRST:
SIMVCC:
VBATT:
VCORE:
VDIG:
VDSPC:
VLCD:
VRAD:
V380B:
VRTC:
VVCO:
4/00021-2/FEA 209 544/21 B
DC voltage through the system connector for charging.
Ground.
Logical signal that activates the background illumination.
Logical signal that activates the background illumination.
Voltage from the On/Off key that starts the phone.
Real Time Clock. The clock that keeps track of time.
Signal from the processor used for communication to SIM, clock signal.
Signal from the processor used for communication to SIM, data signal.
Signal from the processor used for communication to SIM, reset signal.
Feed voltage for SIM.
Battery voltage.
DC voltage for the processor and memory at, for instance, stand by mode.
Lower than VDIG.
DC voltage for the processor and memory.
DC voltage for the DSP (Digital Signal Processor).
DC voltage for the display that controls the contrast.
DC voltage for the radio part except the synthesizer.
DC voltage for the radio part.
DC voltage for the real time clock.
DC voltage for the synthesizer.
Trouble Shooting Guide, Standard
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