Receiver Logic Input Voltages; N7160 Receiver Overview - Nokia 6235 Troubleshooting Manual

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Receiver Logic Input Voltages

Figure 40 shows the receiver logic input voltages.
Table 5 includes the measure logic levels for the N7160.
If the logic levels are significantly off (+/- 0.2V), replace the N7160 and re-measure. If
the voltages are still out of specifications, refer to the Baseband Troubleshooting chapter.

N7160 Receiver Overview

Keep the following points in mind regarding the N7160 receiver:
• There is a separate LNA for 800MHz (Cell and AMPS) and 1900MHz (PCS).
• There is a separate RFA (inside N7160) for 800MHz (Cell and AMPS) and
Issue 1 04/2005
3 2
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Figure 40: Receiver logic input voltage test points
Table 5: Rx Front-end (N7160) Logic Levels
Mode
IF_SEL
AMPS High Gain 2.8 V
AMPS Low Gain 2.8 V
Cell CDMA High Gain 0 V
Cell CDMA Low Gain 0 V
PCS CDMA High Gain 0 V
PCS CDMA Low Gain 0 V
©2005 Nokia Corporation
6235/6235i/6236i (RM-60)
RF Description and Troubleshooting
Logic Input Voltages
BAND GAIN_CTL
0.1 V 2.8 V
0.1 V 0 V
0.1 V 2.8 V
0.1 V 0 V
2.7 V 2.8 V
2.7 V 0 V
Company Confidential
N7160
Page 41