CC Technical Documentation Troubleshooting - RF
RM-11
Issue 2 09/2005 ©2005 Nokia Corporation Confidential Page 59
N750 Rx Troubleshooting
Things to Keep in Mind:
• There is a separate LNA for 800MHz (Cell and AMPS) and 1900MHz (PCS).
• Inside N750 is the RFA again. There is a separate RFA for 800MHz (Cell and
AMPS) and 1900MHz (PCS).
• After RFA, there is a mixer and then the signals are separated by CDMA (Cell and
PCS) and AMPS.
For example, if there is no IF frequency (128.1MHz), check both Cell and PCS. If
only one has at 128.1MHz (L753), check if IF_Sel is working. If it is, then replace
N750 (bad RFA).
• If Cell and AMPS are working fine, but PCS is not, look at the band select line and
the PCS LNA before replacing N750.
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