Samsung SGH-U700 Service Manual page 29

3-2.RF
3-2-1. EGSM Rx
Continuous RX ON
RF Input : 62CH
AMP : -50dBm
Normal Condition Catch the
Check pin #8 of
PAM101 ≥ -65dBm
Check pin #7 of
PAM101 ≥ -65dBm
Check pin #32,33 of
U201 ≥ -65dBm
Check VDDA pins of
U201 ≒ 2.65V
Check the pin #7 of
U201 = 19.2Mhz
Check the pin #10,11,12,13 of
U201 Vp-p=160mV
GSM Receiver is O.K?
YES
channel
YES
YES
NO
YES
YES
YES
YES
YES
YES
END
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NO
Check soldered status of
ANT, R127, C101, C104
Resolder or Change
NO
RFS101, L100,C100
Check PAM 101
pin #1 : High
pin #27,28 : Low ?
NO
Resolder or change U301
NO
Check soldered status of
NO
Resolder or change PMIC500 pin 67,
NO
Resolder or Change TCX101
NO
Resolder or Change U201
NO
GSM RX path component
resolder or change
3-12
Flow Chart of Troubleshooting
YES
Resolder or Change
PAM101
C146,L101,L104
R520
①
②
③
④
⑤
⑥
⑦