Nokia NSW-5 Series - Page 246

NSW-5
Disassembly and Troubleshooting Instructions
PAMS Technical Documentation
Page 40
Issue 1 10/00
 Nokia Mobile Phones Ltd.
Check TXIF Z900
Pin7
f: 161.19
MHz
P: >–25 dBm
Change upconverter
N900
Is Z900 Insertion
loss too high?
IL>5 dB
Change filter Z900
Check modulator
output at R911
P
≅
–18dBm
max
Check R911
Is TX I/Q
OK?
V: 0.8 VDC +/– 0.4
V (symmetrical)
Check
COBBA
I&Q
DACs
(BaseBand
Change N750
Y
N
Y
N
N
Y
N
Y
Note!
check also I/Q–resistors
R760