Ericsson T18s Trouble-Shooting Instruction page 5
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Also See for T18s:
- User manual (107 pages) ,
- User manual (96 pages) ,
- User manual (111 pages)
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RTC:
Real time clock. The clock that keeps track of time and date.
SIMCLK:
Clock signal from the processor, through D901, used for communica-
tions with the SIM.
SIMDAT:
Data signal from the processor, through D901, used for communica-
tions with the SIM.
SIMRST:
Reset signal from the processor, through D901, used for communica-
tions with the SIM.
SIMVCC: The up switched VDIG, 5 V (in D901), used for the SIM.
VBATT:
Battery voltage, 4.8 V.
VBUZZ:
Feed voltage to the voltage transformer for the display (becomes
VLCD and VLCDMEAS).
VCORE:
Feed voltage to D600 and D900, 2.5 V.
VDIG:
DC voltage for the processor and memory, 3.2 V.
VLCD:
DC voltage for the display that controls the contrast.
VLCDMEAS:The same as above, but is used in N800 to measure the voltage.
VRAD:
DC voltage for the radio part except the synthesizer, 3.8 V.
VRPAD:
DC voltage for the radio part in D600, 3.2 V.
VRTC:
DC voltage for the real time clock, 3.1 V, also existing when the phone
is powered off..
VVCO:
DC voltage for the synthesizer, 3.8 V.
VVIC:
Feed voltage to D901 (SIM-controller circuit), 3.2 V).
2
I
C:
Two line serial communications standard using one clock and one data
line.
LO:
Local oscillator.
PWM:
Pulse width modulation.
4/00021-2/FEA 209 544/12.B
T18s, T18sc Standard Electrical Repairs
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(60)
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