Flow Chart of Troubleshooting
10-2-5. GSM850 / GSM900 TX
F100 Pin#17
About 2~3 dBm?
YES
RFS101, C100
Check / Change
|
|
|
|
| ① |
NO |
| F100 | NO | UCD301 | |
|
| Pin#13 = High? |
| ||
|
|
| Check / Change | ||
|
|
|
|
| |
|
|
| YES |
|
|
|
|
|
|
| |
| NO | Level of |
|
| |
| F100 Pin#12 is |
|
| ||
|
|
|
| ||
|
| 4~5dBm ? |
|
| |
②YES
F100
Check & Change
C108 | NO |
= 3.7V? |
|
YES |
|
Level of | NO |
PAM101 |
|
Pin #6 is |
|
1.2V? |
|
YES |
|
YES PAM101 pin#12
About
NO
PAM101 pin#1 NO
High ?
⑤
YES
Change PAM101
UCD100 Check
Pin#34 ≥ 2.8V ?
YES
Check the
Battery Block
|
| ③ |
Check | NO | Check UCD301 TXP |
UCD100 pin#3 |
| |
|
| |
is high? |
|
|
|
| |
YES |
|
|
④ |
|
|
R104 |
|
|
Check & Resolder |
|
|
|
|
|
①
Check UCD301
⑥
NO | C113, UCD301 |
| |
| Check or resolder |
|
|
NO
UCD100 Check | NO |
Pin #21 : 26MHz ? |
|
Vpp : 1.2V? |
|
YES |
|
UCD100 Pin #38, = 1.7V?
TCX101 Check | NO |
Pn#1 : Freq=26MHz, |
|
Vpp=1.2V? |
|
YES
⑧
UCD100
Check & resolder
⑦
TCX101 Check & resolder
⑨
⑤
YES
Check U102
Change PAM101
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