Receiver Dc Test Points; Receiver Rf Test Points - Nokia 1508 Manual

1508(RM-388)
RF Description and Troubleshooting

Receiver DC Test Points

Table 4 includes the descriptions and values for Rx DC troubleshooting test points shown in
Figure 13.
Test Point Description
1 RF_ON1,R103
2 VDD_RX,L801
3 VDD_RX,R104 About 2.6V
4 VDD_RX,C212 About 2.6V
Table 4: Rx DC Test Points

Receiver RF Test Points

For the test points in Figure 14, an external signal source of –96 dBm was added to the RF
input. Set LNA GAIN STATE = 5.The signal was then traced throughout the receiver chains.
An Agilent8960 call box is recommended. Set the band and channel as ETS set. Set the
cell power = - 96dBm. Watch the received power of the DSPM Rfc RXTX. If the received
power of the DSPM Rfc RXTX is not close to the signal generator which means that there is
a problem in the RX line. Measurements were taken with the RF Probe. Signal levels are
approximate, and the accuracy may be +/- 2 dB or more depending on the probe position
and grounding.
Figure 13: Rx DC troubleshooting test points
Value
About 2.9V
About 2.6V
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