Samsung SGH-A737 Service Manual page 60

Umts telephone

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Flow Chart of Troubleshooting

9-2-5. DCS1800 Receiver

**If you check the tx chain,

Check the not only RF Device but also resistor, inductor and capacitor.

Continuous RX ON

RF Input : 698 CH

AMP : -50dBm

NORMAL CONDITION

Catch the channel ?

YES

Check L103 ≥ -55dBm

YES

F102 Check

Pin #6 ≥ -55dBm ?

YES

U104 Check

Pin#38,39 ≥ -

55dBm ?

YES

THE END

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Check antenna contact

Replace RFS100

F102 Resolder or Change

Check the path from F102

to U104

9-26

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