Philips CT6558 Tuning Up Procedure & Operational Manual page 19

PHILIPS
Tuning Up procedure & Operational Manual
D. After resetting CPU, the basic turning on information read from ROM inside will be sent out by TXD0
pin, these codes will be sent to connector, if connector is connected with PC Sever by I/O CABLE, PC
Sever will send back a reply code by RXD0 pin to CPU, Radio hand in PC successfully. Then begin to
download '.fdl' file into Flash.
E. If connector is not connected with PC by I/O CABLE, no reply code feedback, CPU will run , open
Bus, send out Chip-select signal, then run '.fdl' file in Flash, open backlight, display etc, enter normal
mode.
2.
Trouble shooting :Radio cannot power on:
A
.
a. Power the radio measure "VBAT". If the voltage is not correct check battery or power supply.
b. Check the battery connector or interface connector.
c. Check the base band power supply and RF power supply provide by 7400. if not correct change 7400.
d. Check if 32Khz oscillator work. If not work change oscillator.
e. Check if 26M oscillator work. If it doesn't work, change 26M oscillator. Also need check the parts around it;
f. Check PMU, Memory, CPU, tranceiver, otherwise change them.
Vibration issue:
Check if the vibrator is good.
Check if there are assembly issues.
Check if the motor connector, has problem.
Check relative parts.
No key function:
Check metal dome, otherwise change it.
Check side key, whether there is soldering issue.
Check whether it's PCB issue.
Check CPU IC whether CS,US, otherwise change it.
Revision :
Date :2004-9-7
Page No. : Page 19 of 19
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