4. TROUBLE SHOOTING
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CHECKING FLOW
(1) Check Core voltage(TP1)
TP1= 1.2V
(2) Check MEM voltage(TP2)
Yes
No
Check the R510 Soldering
If soldering is fine, change U502
No
Check the R514 Soldering
(2) Check MEM voltage(TP2)
TP2= 1.8V
(3) Check IO voltage(TP3)
TP3= 1.8V
If soldering is fine, change U502
Yes
No
Check the R509 Soldering
If soldering is fine, change U501
Yes
(5) Check SXTAL voltage(TP5)
TP5= 2.6V
Yes
No
Check the U601 Soldering
If soldering is fine, change U503
(4) Check TCXO voltage(TP4)
TP4= 2.8V
Check the R516 Soldering
If soldering is fine, change U501
No
Yes
(6) Check SYS_PLL voltage(TP6)
TP6= 1.3V
No
Check the U605 Soldering
If soldering is fine, change U504
Yes
(7) Check EXTAL Frequency (TP7)
No
Check the X300 Soldering
If soldering is fine change X300
FM300
ki
ll !
TP7= 12Mhz
If soldering is fine, change X300
Yes
(8) Check REF_CLK Frequency(TP8)
TP8= 19.2Mhz
No
Check the U200 Soldering
Yes
FM300 working well !