Nokia RM-11 Series - Measure Logic Levels for Rx Front End (N750)

RM-11
Troubleshooting - RF CC Technical Documentation
Page 58 ©2005 Nokia Corporation Confidential Issue 2 09/2005
Receiver DC Troubleshooting Layout
Measure Logic Levels for Rx Front End (N750)
Note: If logic levels are significantly off (+/- 0.2V), replace N750 and remeasure. If
voltages are still out-of-spec, see the Baseband Description and Troubleshooting
chapter of this manual.
Modes
Logic Inputs Voltages (V)
BAND (1) GAIN_CTL (2) IF_SEL (3)
CELL CDMA HI-GAIN 0.1 V 2.75 V 0 V
CELL CDMA LOW-GAIN 0.1 V 0 V 0 V
PCS CDMA HI-GAIN 2.68 V 2.75 V 0 V
PCS CDMA LOW-GAIN 2.68 V 0 V 0 V
AMPS HI-GAIN 0.1 V 2.76 V 2.76 V
AMPS LOW-GAIN 0.1 V 0 V 2.76 V
1
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