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Flow Chart of Troubleshooting
10-28
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10-2-5. PCS1900 Receiver
Continuous RX ON
RF Input : 698CH
AMP : -50dBm
Check pin #8 of
PAM100
≥
-55dBm
Check pin #32,33 of
U200
≥
-65dBm
Check VDDA pins of
U200
≒
2.65V
Check the pin #7 of
U200 = 19.2MHz
Check the pin #10,11,12,13 of
U200 Vp-p=160mV
END
Resolder or Change
RFS100, L102, C100
Resolder or Change
PAM100
Check soldered status of
C107, F100
L107, L108, L109, L110
Resolder or change PMIC pin #27, #28
and L400
Resolder or Change TCXO100
Resolder or Change U200
Normal Condition Catch the
channel
Check pin #4 of
PAM100
≥
-60dBm
GSM Receiver is O.K?
GSM RX path component
resolder or change
Check soldered status of
ANT, C102, C101, L101
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
Check PAM100
pin #1 : High &&
pin #27, 28 : Low ?
NO
YES
Resolder or change UCP300
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