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CDMA 800/1900
d) Components defective
1. Change L2000 if BOOST is same to B+.
2. Check 16.8MHz if Logic_2.75 and Aud_2.75 is high.
3. Check u-P(U1100) and memory(U1200, U1300) if WDI is low
e) When charger is attached at low battery
1. Check if drain of Q2 is high for 1.5sec after charger is attached
2. Check if base voltage of Q2207 is 0.7V during Q2 is on
Trouble Shooting(Power Down On 'SND')
a) Battery either discharged or defective.
1. Measure battery voltage across a 50 ohm (>1 Watt) load.
2. If the battery voltage is <3.4 V DC,
recharge the battery using the appropriate battery charger.
3. If the battery will not recharge, replace the battery.
b) PA defective
1. Setup the power supply : 4.5V, 500mA
2. Setup the HP8924 : Sectr A Pwr(-83dBm), Data rate(random)
3. Check current drain of phone at call state. Does power supply display 'CC' ?
4. Check if the bias point(PA_VGG1) of PA is -1.3V~-3V and do Phasing.
Trouble Shooting(Accessory Not Working)
1. Check if the voltage range of CHG_SNS_CIA is 1.7V~< 2.4V on VPA
2. Check if the voltage of CHG_SNS_CIA is 0.8V~1.7V on EIHF
3. Check if the voltage of CHG_SNS_CIA is below 0.8V on AC charger
4. Check if the voltage of EXT_B+ is more .45V than battery voltage during charging
68
4/3/01
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