Samsung SCH-N500 Service Manual page 41

7-2-2 Check TX path
Check TX path Check TX path
Yes Yes
(824.64~848.37MHz) (824.64~848.37MHz)
exist at U400 pin23 ? exist at U400 pin23 ?
Yes Yes
Check Gain Characteristics Check Gain Characteristics
RFT6122(U400),RF SAW(F400),Power RFT6122(U400),RF SAW(F400),Power
Amp(U447),Duplexer(F401) Amp(U447),Duplexer(F401)
TX signal TX signal
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No No
Check U400 pin12 Check U400 pin12
and its neighboring circuits and its neighboring circuits
7-13
Flow Chart of Troubleshooting