Pa And Antenna Switch Troubleshooting Diagram - Nokia NHM-1 Series Troubleshooting Instructions

NHM-1
Troubleshooting instructions

PA and Antenna Switch Troubleshooting diagram

PA & ant. switch
troubleshooting
Yes
Check with RF probe
PA output signal level, (*
OK?
No
Check with oscilloscope:
-
VBATT_RF ~ 4V
-
VTXP = 2.8V
pulsed
-
VTXLO_G = 0V,
OK?
Yes
No
Replace PA
Check components
around PA,
OK?
No
Replace faulty
component(s)
Page 12
*(When 1kOhm passive probe is used
correct measurement result by –26dB
Check with oscilloscope
ant. switch Tx controls.
Yes
- VANT_1 (GSM900)
- VANT_2 (GSM1800)
No
Check ant.switch
Tx control lines
components,
Yes
Yes
Replace Helgo
Figure 6: PA and antenna switch troubleshooting
Nokia Corporation.
CCS Technical Documentation
Yes
OK?
OK?
No
Replace faulty
component(s)
Replace
ant. switch
Issue 1 11/03