4. TROUBLE SHOOTING
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4. TROUBLE SHOOTING
TP1
TP4
U508
U502
U506
TP2
TP3
U507
U508
(1) Check RX_PLL
voltage(TP1) TP1= 1.2V
CHECKING FLOW
Yes
No
Check the R538 Soldering
If soldering is fine, change U506
(2) Check TX_PLL voltage(TP2)
TP2= 1.2V
(3) Check DCDC Output
voltage(TP3) TP3= 1.5V
No
Check the R540 Soldering
If soldering is fine, change U507
Yes
No
Check the R546 Soldering
If soldering is fine, change U508
(4) Check 1.2V_RF voltage(TP4)
TP4= 1.2V
Check the R511 Soldering
If soldering is fine, change U502
No
Yes
FM300
ki
ll !
Yes
FM300 working well !