Tdma Tx Tunings - Nokia NPM-2NX Troubleshooting Manual

NPM-2NX
Troubleshooting
• Tuning results are only visible after unsuccessful tuning with auto-tune proce-
dure
• This tuning has done simultanously with AFC-tuning
If LP and AMP2 filter tuníngs fail it might be due to:
• Problems with lower band signal path (synthetizer etc.)
• VCTCXO component can be broken
• Safari can be broken or solder joints
UB RX AGC tuning
• UB TDMA minimum gain (around 0 dB), measured when lna is switched off
• UB LNA gain step, measured when lna is switched on. Result is gain difference
between lna on and off (around 20 dB)
• If UB TDMA minimum gain is lower than -2 further analysis is needed. Result
32752 means that the signal doesn't go through RX chain at all or it has a lot of
attenuation.
If it fails there can be following problems:
• Rx chain is totally deaf or some gain is missing, start receiver troubleshooting
LB RX AGC tuning
• LB TDMA minimum gain (around 2 dB), measured when lna is switched off
• LB LNA gain step, measured when lna is switched on. Result is gain difference
between lna on and off (around 20 dB)
• If LB TDMA minimum gain is lower than -2 dB, further analysis is needed. Result
32752 means that the signal doesn't go through RX chain at all or it has a lot of
attenuation.
If it fails there can be following problems:
• Rx chain is totally deaf or some gain is missing, start receiver troubleshooting

TDMA TX tunings

If some TX tunings fails, start always TX troubleshooting!
TX IQ (TxIq)
Page 62 ãNokia Corporation
CCS Technical Documentation
Issue 1 07/02