LENOVO S960 Cellphone Service Manual
Page 32
4.4 WCDMA comprehensive test
4.4.1
ACLR or SEM
Problem: ACLR or SEM.
Reason: It’s not calibrated; or WCDMA PA (U2202, U2203) has a dry joint problem; or RF receiver
and transmitter (U2105) is faulty.
Troubleshooting:
4.4.2
The
results
of
PowerControl
comprehensive test are not good.
Problem: PowerControl
Reason: It’s not calibrated; or just passed the critical point of calibration.
Troubleshooting: Re-calibrate.
ACLR or SEM
Re-perform WCDMA calibration. Then check
whether the problem is fixed.
Re-solder PA (U2202, U2203) or
replace PA and components in
emission channel. Then check
whether the problem is fixed.
N
Re-solder or replace the
receiver and transmitter.
N
