68
4/3/01
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
Summary of Contents for T2260
Page 1: ...CDMA 800 AMPS V2260 T2260 CDMA Dual Mode 800 1900 V2267 T2267 CDMA ...
Page 14: ...14 4 3 01 CDMA 800 1900 ...
Page 20: ...20 4 3 01 CDMA 800 1900 ...
Page 21: ...21 4 3 01 Troubleshooting AUDIO LOGIC BLOCK DIAGRAM ...
Page 23: ...23 4 3 01 Troubleshooting Logic Circuitary Description CDMA baseband Tx Path ...
Page 24: ...24 4 3 01 CDMA 800 1900 CDMA Baseband Rx Path ...
Page 25: ...25 4 3 01 Troubleshooting RF Interface Diagram ...
Page 27: ...27 4 3 01 Troubleshooting Amps Transmitter Block Diagram ...
Page 38: ...38 4 3 01 CDMA 800 1900 ...
Page 58: ...58 4 3 01 CDMA 800 1900 ...