Lenovo S930 Manuel d'entretien - Page 24
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LENOVO S930 Cellphone Service Manual
4.2 GSM comprehensive test
4.2.1 Switching spectrum and PVT template are over the
limits.
⚫
Switching spectrum and PVT template of three frequency bands (GSM, DCS and PCS) are over
the limits.
⚫
If C2111 on PA's V_ramp signal cable is damaged or has a dry joint problem, switching
spectrum may become over the limits.
⚫
Troubleshooting:
Switching spectrum and Ramp
Mask are over the limits.
Check whether the voltage of Pin13 of PA
module (U2102) is in the normal range.
Check whether input and output matching
components have dry joint problems.
Replace components which have dry joint
problems.
Replace PA module as needed.
4.2.2 Frequency Error is too big.
⚫
Problem: Frequency Error is over the limit in whole-unit test.
⚫
Reason: TCXO's VAFC input circuit has a problem.
⚫
Troubleshooting:
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