Samsung SGH-A737 Service Manual page 39

Umts telephone

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9-1-3. SIM Part

"Please insert SIM card "

Check the CD400's

Connection to SIM card

Check the voltage

at CD400 pin #11 ≒ 3.0

There is any signal

pin#13,#15,#16 of CD400

Check the SIM Card

YES

END

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Resolder or change CD400

Check the PM401 & UCP300

** Check SIM's signal

when you see SIM checking display

9-5

Flow Chart of Troubleshooting

Check the PM401

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