Nokia RH-30 Series Troubleshooting Instructions page 17

PA & ant switch
ICQ: 343183001 QQ: 35070846 Email: Serviceic@yahoo.com.cn
EDGE troubleshooting
Check with RF probe signal level on PA
input:
(GSM850&900)
~ -8dBm@PCL=8 (GSM900)
~ -10dBm@PCL=2 (GSM1800&1900)
OK?
Yes
Check with oscilloscope:
, Iref_850~2V peak
-VBATT ~4V
-Iref _900 ~2V peak
-Iref_1800_1900 ~2.1V peak
-VTXB = 2.8V pulsed
-Mode = ~1.8V
OK?
No
Check components
around PA
OK?
No
Replace faulty
component(s)
Figure 9: Pa & ant switch EDGE troubleshooting
Yes
Yes
Replace PA
Yes
Replace
HELGO
Check with oscilloscope:
(GSM850/900)
-VANT1 (GSM900)
-VANT2 (GSM1800)
-VANT3 (GSM1900)
OK?
No
Check VANT line
components
OK?
Yes No
Replace faulty
component(s)
Yes
Replace ant.
switch