User Guide

RH-23 Company confidential
CCS Technical Documentation
Page 18 Nokia Corporation. Issue 1 03/2004
Figure 10: Pa & ant switch EDGE troubleshooting
Yes Yes
Yes No
Yes No
Yes
No
Yes
No
PA & ant switch
EDGE troubleshooting
Check with RF probe signal level on PA
input:
~ -8dBm@PCL=8 (GSM900)
~ -10dBm@PCL=2 (GSM1800&1900)
OK?
Check with oscilloscope:
-VANT1 (GSM900)
-VANT2 (GSM1800)
-VANT3 (GSM1900)
OK?
Replace ant.
switch
Check with oscilloscope:
-VBATT ~4V
-Iref _900 ~2V peak
-Iref_1800_1900 ~2.1V peak
-VTXB = 2.8V pulsed
-Mode = ~1.8V
OK?
Check VANT line
components
OK?
Replace PA
Replace
HELGO
Replace faulty
com
p
onent
(
s
)
Check components
around PA
OK?
Replace faulty
com
p
onent
(
s
)
)