Samsung SGH-A737 Service Manual page 56

Umts telephone

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Flow Chart of Troubleshooting

9-2.RF

9-2-1. GSM850 Receiver

**If you check the tx chain,

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

Continuous RX ON

RF Input : 60 CH

AMP : -50dBm

NORMAL CONDITION

Catch the channel ?

YES

Check L112 ≥ -55dBm ?

YES

F103 Check

Pin #3 ≥ -55dBm ?

YES

U104 Check

Pin#32,33 ≥ -

55dBm ?

YES

THE END

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Check antenna contact

Replace PAM101

F100 Resolder or Change

Check the path from F103

to U104

9-22

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