Nokia NSW-5 Series Service Manual page 246

NSW-5
Disassembly and Troubleshooting Instructions
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 R911
P ≅ –18dBm
max
Is TX I/Q
OK?
V: 0.8 VDC +/– 0.4
V (symmetrical)
Change N750
Page 40
Y
Change upconverter
N900
Y
Change filter Z900
N
N
Check R911
Y
N
Check
COBBA
DACs
I&Q
(BaseBand
Y
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
Note!
check also I/Q–resistors
R760
Issue 1 10/00