User Guide

PAMS Technical Documentation Troubleshooting
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After any repair, reflash, retuning etc. the receiver performance must be checked in normal mode.
Place phone PWB in module repair jig or use service battery and antenna adapter, follow instructions
in chart in chart below:
Connect Phone to
GSM tester, and
set to Normal mode
Measure BER at
-102dBm on EGSM
channels 975, 38, 124
Measure BER at
-102dBm on GSM1800
channels 512, 700, 885
Measure RX level at
-80dBm on EGSM
channels 975, 38, 124
Some or all EGSM
measurements
out of range 28 to 32
Some or all GSM1800
measurements
out of range 28 to 32
Go to chart
EGSM RX
Troubleshooting
Go to chart
GSM1800 RX
Troubleshooting
Check
R509, R512, C535
C536 and BB
RX OK
Go to BB chart
Phone not registering
to a Network
Some or all GSM1800
measurements
above 2%
All measurements
in range 28 to 32
Go to chart
RX Troubleshooting
All measurements
below 2%
Go to chart
RX Troubleshooting
Go to chart
EGSM RX
Troubleshooting
Go to chart
GSM1800 RX
Troubleshooting
Oscilloscope
VB_EXT/R509 = 1.35V
Wait for Service
indicator, Setup call.
Measure RX level at
-80dBm on GSM1800
channels 512, 700, 885
Phone in call state?
Some or all EGSM
measurements
above 2%
Ye s
No
Yes
No
Ye s
No
Yes
No
No
Yes
Yes
No
Yes
Yes
No
RX troubleshooting
Normal mode