Receiver Logic Input Voltages - Nokia 3155 Rf Description And Troubleshooting

3155/3155i (RM-41), 3152 (RM-61)
RF Description and Troubleshooting

Receiver Logic Input Voltages

Figure 36 shows the receiver logic input voltages.
Table 11 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.
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Figure 36: Receiver logic input voltage test points
Table 11: 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
1 3
2
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 ISSUE 1 07/2005