Nokia NSW-6 Series Disassembly & Troubleshooting Instructions page 36

NSW-6
Disassembly & Troubleshooting
Continues from previous page
Check TXIF Z900
Pin7
f: 161.19
MHz
P: >–25 dBm
N
Is Z900 Insertion
loss too high?
IL>5 dB
Check modulator
output at R925
P ≅ –18dBm
max
Is TX I/Q
OK?
V: 0.8 VDC +/– 0.4
V (symmetrical)
Change N700
Page 36
Y
Change upconverter
N900
Y
Change filter Z900
N
N
Check R925
Y
Check
N
I&Q
COBBA
DACs
(BaseBand)
Y
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
Note!
check also I/Q–resistors
R760
Issue 1 12/99