Samsung SPH-A900 Service Manual page 38

Flow Chart of Troubleshooting
7-2. RX
7-2-1 CDMA/PCS mode
START
CDMA/PCS mode
SVC &
ROAM OK?
YES
Call OK?
YES
FER OK?
YES
End
NO Check CDMA/PCS
Rx Path
NO
DVGA value
Check OK?
YES
Tx Path
Check OK?
YES
NO
Check RFR6000(U301),
MSM6500(UCP102)
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1. visual check! (soldering)
2. S/W Mode Check : CDMA Mode Check
3. VCTCXO(TCK301) Check : 19.2MHz
4. VCO(OSC301) voltage/frequence level check
Frequence : 1715MHz < f < 1788MHz
Supply Voltage:
Control Voltage:
5. U300 LNA gain check
6. PAM400, PAM403 Check
NO
Adjust DVGA by
program
S1M8690X(U402)
NO
Check Adjust TX by
7-10
2.75 ± 0.1V
0.4 ~ 2.3V
program