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LENOVO S930 Cellphone Service Manual

4.4 WCDMA comprehensive test

Problem: ACLR or SEM.

Reason: It's not calibrated; or WCDMA PA (U2202) has a dry joint problem; or RF receiver and

transmitter (U2101) is faulty.

Troubleshooting:

Re-perform WCDMA calibration. Then check

whether the problem is fixed.

Re-solder PA (U2202) or replace PA

and components in emission channel.

Then check whether the problem is

fixed.

Re-solder or replace the

receiver and transmitter.

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.

Problem: FrequencyErr

Reason: It's not calibrated; or there's outside interference.

Troubleshooting: Re-calibrate.

ACLR or SEM

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