Flow Chart of Troubleshooting
10-2-3. GSM1900 RX
Continuous RX ON
RF Input : 62 CH
AMP :
|
|
| ① | |
NORMAL CONDITION | NO |
| Check soldered status of | |
|
| |||
Catch the channel ? |
|
| L103, C101, C104, L101 | |
YES |
|
|
|
|
|
|
| ② | |
F100 Check | NO |
| RFS101, C100 |
|
|
|
| ||
Pin #17 ≥ |
|
| Resolder or Change |
|
YES |
|
|
|
|
F100 Check | NO | |
Pin #1,2 ≥ |
| |
| YES |
|
UCD100 Check | NO | |
| ||
Pin#10,11 |
| |
YES
NO
UCD100 Check
Pin#27 =1.8V ?
YES
③
F100 Resolder or Change
④
Check soldered status of L110, L111, L107
CHECK UCD301
UCD100 Check | NO |
| ||
Pin#34 =Clean 2.8V? |
|
| ||
| YES |
|
| |
UCD100 Check | NO |
| ||
Pin#35,36,37,38=100mV? |
|
| ||
| YES |
|
| |
|
|
| ||
|
|
| UCD100 Check | NO |
|
|
| Pin #21 : 26MHz ? | |
|
|
|
| |
|
|
| Vpp : 1.1V? |
|
|
|
| YES |
|
|
| ⑥ |
|
|
|
|
|
|
|
|
|
| UCD100 |
|
|
|
| Change or resolder |
|
|
|
|
|
|
⑤
C113, UCD301
Check or resolder
TCX101 Check | NO | |
Pn#3 : Freq =26MHz, | ||
Vpp=1.2V? |
| |
YES |
| |
|
|
|
UCD100 |
|
|
Check & resolder |
|
|
⑦
TCX101
Check & resolder
Check UCD301
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