Lenovo i909 Maintenance Manual - Page 25

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Lenovo i909 Maintenance Manual
I908 Mobile Phone Maintenance Manual

4.3.2 Significant frequency error

Problem: Frequency errors during the testing of the unit exceed norms.
Cause of the Problem: 1) Problems with AFC calibration
2) Crystal was reversely attached. Damage or pseudo soldering
Faults Solution:

4.3.3 Significant phase error

Problem: The phase error during the testing of the unit exceeds norms and the ORFS
spectrum exceeds norms between 0-10 bits.
Frequency Error exceeds the
norms
Recalibrate
Check X21015 for possible
pseudo
soldering
Replace elements with
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