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4.2.1 Check Regulator(PMIC) Circuit
U400 Pin 13
(+2.85V_TX_REG)
TEST POINT
U400 Pin 16
(+2.8V_MSMP)
U400 Pin 4
(+4.2V_Vbatt)
U400 Pin 29
(+2.6V_Tx)
Circuit Diagram
Checking Flow
U400
U201
+2.6V_TX
NO
NO
+2.8V_MSMP
U201 Pin E14
Check Pin 4, 13, 16, 29
+2.85V_TX_REG
Replace U201
TX ON High?
+4.2 Vbatt
OK?
YES
YES
Regulator Circuit is OK
Replace U400
See Next Page to Check
VCTCXO
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