Nokia NSC/W–1/3 Series Disassembly & Troubleshooting Instructions page 29

PAMS
Technical Documentation
Check TXIF Z900 Pin7
f: 161.19 MHz
P: >–25 dBm
N
Is Z900 Insertion too
high ?
I.L : > 5 dB
N
Check modulator
output N750 pin62
P: max.–18dBm
Is TX I/Q OK?
V: 0.8 VDC +/– 0.4 V
(symmetrical)
Change N750
Original 11/99
Disassembly & Troubleshooting Instructions
Y
Change N900
upconverter
Y
Change Z900
N
Check R906
Y
Check COBBA
N
I&Q DACs
(baseband)
Y
NSC/W–1/3
Note!
check also I/Q–resistors
Page 29