User Guide

NSB-5
Troubleshooting Instructions PAMS Technical Documentation
Page 16 Nokia Mobile Phones Ltd. Issue 1 03/01
Figure 11: Fault Finding for Network Registration or Call Problems (Cont’d)
D
RF control lines:
AGC (R610) 0->2.3Vmax during receiving slot
AFC (C720) 0- 1.2V typ. during receiving slot
OK?
Check N200
Analog data signals:
RxIP & RxIN (C640, C641) 0->1.5V DC during
receiving slot
Recieved signal is biased to DC, amplitude 50mVpp
nominal and frequency 13MHz
OK?
Check N200 if DC fail
or
RF part
No
Yes
No
RF control line:
TxC (C524) 0->2.3Vmax during transmit slot
OK?
Check N200 if TxC fail
else
Check D300
Analog data signals:
TxIN & TxIP (C525) 0->0.8V DC during transmit slot
TxQN & TxQP (C526) 0->0.8V DC during transmit slot
Transmit signal is biased to DC, amplitude 300mVpp and
frequency 64kHz
Yes
No
Yes
OK?
Check RF part Check N200
NoYes