Nokia 6150 Manuales De Servicio

PAMS

Technical Documentation

NSM–1

Tuning Instructions

Page  10

Original 10/98

Follow the steps described in chapter ”Service Software Instructions” sec-
tion ”RX calibration... command”.

Software reports the following:

AFC init value
AFC slope
PSW slope
AGC DAC values and the corresponding voltages for each gain step (0 -
57 dB)

If everything went well the reported values should approximately be the
following:

AFC init value

–80

80

AFC slope

130

230

PSW slope

250

350

AGC 0 dB

400

640

AGC 57 dB

100

300

Difference between the two neighbour
AGC steps

10

20

If the calibration does not succeed the software normally reports ”Unable
to read data from phone” or ”Failed to set high reference” or ”Failed to set
low reference”.

In this case check first the basic functionality of the receiver chain: RF
generator frequency set as in the calibration and level for example to the
high reference value.

Then go to the RSSI reading menu (under RF controls). If the reading is
very low there is something broken in the receiver and must be found by
measuring voltages and signal levels at different places (information of
these can be found elsewhere in this manual).

If the RSSI reading seems to be within 5 - 10 dB the same as the RF in-
put level check that the VCTCXO (G650) frequency is close enough the