Nokia 3806 Service Manual page 143

RM-583
RF Description and Troubleshooting
TX path faults
No
Measure DC test
1@table 1, is it 3.8V?
Yes
Measure DC test
2@table 1, is it high?
Yes
Measure DC test
3@table 1, is it high?
Yes
No
Measure RF test point 1@
table 2, is it ok?
Yes
Measure RF test point 2@
table 2, is it ok?
Yes
Measure RF test point 3@
table 1, is it OK?
No
Yes
Measure RF test point 4@
table 2, is it ok?
Yes
Measure RF test point 5@
table 2, is it ok?
Yes
TX troubleshooting finished
Issue 1
No
point Check Power supply
Is it 3.8V?
No
point Reheat solder joints
Of QSC1110
No
point Reheat solder joints
Of QSC1110
No
Reheat solder joints of
L312,,C319, C320
No
No
Reheat solder joints
of C253
No
Reheat solder joints
of U201
No
Reheat solder joints
Of U103
No
Reheat solder joints
Of C103
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Set its output to 3.8V
No
Change U202(PA)
No
Reheat solder joints
Of S101
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