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Flow Chart of Troubleshooting
10-30
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10-2-5. GSM850 / GSM900 TX
C108
=3.7V?
Change PAM101
NO
YES
F100 Pin#17
About 2~3 dBm?
F100
Pin#13 = High?
UCD301
Check / Change
NO
RFS101, C 100
Check / Change
YES
F100
Check & Change
YES
Check the
Battery Block
Level of
PAM101
Pin #6 is
1.2V?
Check
UCD100 pin#3
is high?
Check UCD301 TXP
YES
YES
NO
NO NO
NO
PAM101
pin#12
About -5 dB m?
PAM101 pin#1
High ?
Check UCD301
YES
NO
YES
UCD100 Check
Pin#34
≥
2.8V ?
UCD100 Check
Pin #21 : 26MHz ?
Vpp : 1.2V?
NO
YES
NO
NO
YES
C113, UCD301
Check or resolder
UCD100 Pin
#38, = 1.7V?
YES
Change PAM101
Check U102
NO
YES
Level of
F100 Pin#12 is
4~5dBm ?
R104
Check & Resolder
TCX101 Check
Pn#1 : Freq=26MHz,
Vpp=1.2V?
NO
UCD100
Check & resolder
TCX101
Check & resolder
YES
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