User Guide

PAMS
Technical Documentation
NSE–8/9
Troubleshooting
Page 21
Issue 1 07/99
Uplink is broken
Voltage at C230 is 1.8V
Voltage at C231 is 0.3V
during call
Check:
microphone connections on X503
micbias components (C219, R214,
C220,R215, R216)
DC–Voltage
on COBBA side of C258 & C259
is 1.4V
during call
Check N200 COBBA
No
Yes
No
Yes
Audio voltage
(few millivolts)
on COBBA side of C258 & C259
during call
Check C226, C229, R230,
R219, R220
MICRO–PHONE
and PCB
Check N200
No
Yes
Figure 4–16