Logic Circuit Principle And Troubleshooting - Philips CT6558 Tuning Up Procedure & Operational Manual

PHILIPS
Tuning Up procedure & Operational Manual
Tranceiver
RF connector
Step5:
Measure the input signal and output signal of RF-SWITCH (7010). Also need check and control signal of 7010 .
Measure antenna at last. CheckU501,Antenna, if the signal is not good.
5.2.3 Logic circuit principle and troubleshooting：
radio can't turn on
1. the turning on process introduction :
A. First power on radio, then after getting V_BAT, PMU will generate V_ISUP(2.7V),
7400 32.768K oscillator begin to run. ONKEY_N output 2.3V.
If radio is connected with I/O CABLE, when DownLoad software into radio, PC Sever will be ready.
B. Pressing ON_KEY, about 14ms later, PMU will generate VDD1,VDD2, VDD3,AVDD,VCC_SYN.and
VDD1,VDD2 ,AVDD is supplied to CPU, V-MEM is supplied to Memory, VCC_SYN is supplied to
7130.
7130 will generate VCCREF which will be used for 1060(oscillator). After 9 CLK32 period(one CLK32
period is about 30uS),1060 will generate stable 26M clock signal, which will be divided by 2 inside
7130 ,and output REF_13M supplied to CPU.
C. After 32 CLK32 period when already generated stable 26M clock, the ON/OFF CONTROL module
in PMU will generate RESTO_N signal, which will flow to CPU ,and reset CPU.
RF Switch
Revision :
Date :2004-9-7
Page No. : Page 18 of 18
PA&PAC IC
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