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Flow Chart of Troubleshooting
9-48
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9-2-6. Abnormal EGSM Rx Operation
PIN28
PIN27
PIN1
U202 PIN8
≥ -60dBm
U202 PIN4
≥ -70dBm
Resolder RFS200,
L203,C236,L219
U202 PIN3,4
≥ -75dBm
Check U202
PIN28=H, PIN27=L
PIN1=H
Resolder or Change
F202,C264,L206
Check Antenna
Switch Control
Resolder or Change
U202
YES
YES
YES
YES
NO
NO
NO
RX ON
AMP--50dBm
Check U201,
UCP400
END
U201 PIN48,
49 ≥ -75dBm
NO
Resolder or Change
C263,C265,L208
YES