Nokia 1506, Руководство по обслуживанию

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RH-128
RF Description and Troubleshooting
Receiver DC Test Points
Figure 12: Rx DC troubleshooting test points
Table 3 includes the descriptions and values for Rx DC troubleshooting test points shown in Figure 12.
Test Points Description Value
1 L201 VDD_RX,
About 2.6V
2 R211 VDD_RX
About 2.6V
Table 3: RX DC Test Points
Receiver RF Test Points
For the test points in Figure 13, an external signal source of –96 dBm was added to the RF input. Set LNA
GAIN STATE = 4.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: Receiver RF troubleshooting test points
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