Lenovo S930 Servicehandleiding - Pagina 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.

⚫

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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