Nokia 3806, Service Manual

Page: 143 / 162

RM-583
RF Description and Troubleshooting
TX path faults
No
Yes
Measure DC test point
1@table 1, is it 3.8V?
No Set its output to 3.8V
Check Power supply
Is it 3.8V?
Measure DC test point
2@table 1, is it high?
No
Reheat solder joints
Of QSC1110
Yes
Measure DC test point
3@table 1, is it high? No Reheat solder joints
Of QSC1110
Yes
No
Measure RF test point 1@
table 2, is it ok? No Reheat solder joints of
L312,,C319, C320
Yes
No No
COMPANY CONFIDENTIAL
Copyright © 2009 Nokia. All rights reserved.
Issue 1 Page 7-11
Measure RF test point 2@
table 2, is it ok? Change U202(PA) Reheat solder joints
of C253
No
Yes
No
Measure RF test point 3@
table 1, is it OK?
No
Reheat solder joints
of U201
Yes
Measure RF test point 4@
table 2, is it ok? No Reheat solder joints
Of U103
Yes
Reheat solder joints
Of C103 Reheat solder joints
Of S101
No No
Measure RF test point 5@
table 2, is it ok?
Yes
TX troubleshooting finished