User Guide

PAMS Technical Documentation 6 - Troubleshooting
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Phone doesn’t register to network
or phone doesn’t make a call
C292 towards D200 (UEM) ~4.75 VDC
C294 towards R308 ~2.78 VDC
C295 towards UEM ~2.78 VDC
C296 towards V310 ~2.78 VDC
C297 towards UEM ~2.78 VDC
C298 towards R307 ~2.78 VDC
C299 towards V310 ~2.78 VDC
C288 towards R306 = 1.35 VDC
C289 towards UEM = 1.35 VDC
all during GSM frame. Use TXP on J701
Yes
Check:
D200, D400,PWB
No
Check RF serial bus:
RFBUSCLK on J421
RFBUSDA on J422
RFBUSEN1X on J423
Transitions "1" <-> "0",
1.8 VDC <-> 0 VDC during GSM frame
Yes
Check:
D400,PWB
No
Check analog signals during
GSM frame (Tx slot):
TXIOUTP and TXIOUTN on C715
DC level = 1-1.25 VDC
TXQOUTP and TXQOUTN on C716
DC level = 1-1.25 VDC
Yes
RF
troubleshooting
No
Yes
Check analog common mode signals during
GSM frame (Rx slot):
See RF trouble shooting
Check:
D200,D400,
PWB, RF
No
Check RF
Yes