Pa And Antenna Switch - Nokia NHL-2NA Series Troubleshooting Instructions

NHL-2NA

PA and Antenna switch

PA&ant switch
troubleshooting
Check with RF probe PA
output signal level
+7dBm on 900 PA o/p
0 dBm on 1800 PA o/p
OK ?
NO
Check with oscilloscope:
- PA Vcc, Vcc1, Vcc2, Vcc3 =2.7V
- 900 & 1800 PA bias =2.7V pulsed
- VTxLo_GSM = 0 V (GSM900)
OK ?
NO
Check components
surrouding PA.
OK?
NO
Replace faulty
components
Page 22
Check with oscilloscope
Ant. switch Z672 Tx
YES
controls.
OK?
NO
Check ant switch Z672
Tx control line
components.
OK?
YES
Replace PA
YES
¤Nokia Corporation
CCS Technical Documentation
Replace ant. switch
YES
Replace faulty
YES
components
NO
Replace HAGAR
Issue 1 07/02