Nokia 7600 - Page 24

NMM-3 Company Confidential
6-Troubleshooting CCS Technical Documentation
Page 6-24 Copyright  2003 Nokia Corporation Issue 1 (11/2003)
Company Confidential
PA and DC-DC Converter Troubleshooting
Y
es
Y
es
No
Y
es
Y
es
Y
es
No
No
No
Check with RF probe
Signal level at PA input
-3dBm?
Check Ireg voltage
(C980)1.3v?
Replace faulty
com
p
onents
Replace
Faulty
component
Y
es
Check VREG=2.8v
Check detector
voltage (C960)
0.6v<V<1.5v
Y
es
Check components
around detector
circuit OK
Y
es
Check R965 & R967
OK?
Check coupler,
isolator & duplexer
OK?
Replace DC-DC
converter
Change
PA
No
Check DC-DC Converter
enable
V
bat=3.6v (C387)
V
CC1 & VCC2
≥
1.5v
Check components
around DC-DC
converter OK?
Replace
faulty
component
No
No
Replace
faulty
component