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CDMA 800/1900
LOGIC TROUBLESHOOTING
Phone is not powered on(1)
Battery Discharged
Measure battery voltage and if the battery voltage is <3.6 V DC, recharge the battery using the
AC charger.
Battery contact opened or misaligned
Supply the B+ power through test port J3002(B+), J3001(GND) by using the test interface cable. If
the phone is powered on, check the battery fail or battery contact defect
B+ Supply defective
Apply the power BATT+ through the battery contact. Check the B+ voltage by measuring 3.6-
4.2V at the pin 48 of U2000 CCAP lite. If the B+ doesn't come out, check the Q3300
Power Supply defective
Supply the B+ power through test port J3002(B+), J3001(GND) by using the test interface cable.
Depress the PWR button and measure the supplied voltage of each part within 300ms of start of
ON_OFF signal.
Check the Logic_4.75 voltage by measuring 4.75V at the pin 41 of U2000 CCAP lite
Check the Logic_2.75 voltage by measuring 2.75V at the pin 28 of U2000 CCAP lite
Check the Audio_2.75 voltage by measuring 2.75V at the pin 22 of U2000 CCAP lite
Check the Logic_1.8 voltage by measuring 2.75V at the pin 3 of U2000 CCAP lite
If the above supply voltages don't create by CCAP lite, Replace the U2000 part or check the logic
2.75/ Audio 2.75 power path shortage
Phone is not powered on (2)
Reset Signal
Check the RESETB Signal from CCAP lite U2000 by measuring the voltage of C2044 or pin 30 of
U2000
Depress PWR button, then the RESETB signal shall maintain 'Low' for approximately 255msec
after power on and go to 'High'
If reset signal don't come out, check the CCAP U2000 part.
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4/3/01
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