Nokia Mobile Phones NSE-5 Series Service Manual page 138

NSE–5
Service Software Instructions
If both of these (RSSI reading and the frequency) seem to be correct and
calibration still fails the most probable reason is that there is a little lack of
gain somewhere or the AGC gain control slope in N600 is out of the limits.
This can be verified by changing the generator reference levels from the
demanded ones in the calibration procedure in 1–dB steps up and down.
If the calibration goes through with some reference levels the corrective
action is most probably changing N500 or N600.
Dialog mode: modal
RX Calibration dialog has the following items:
AFC information box:
Shows AGC,DAC voltage.
AGC List box (ALT+A):
AGC, DAC, Voltage and Difference. The difference column shows the
difference between tuned DAC values and mean straight line calculated
from part slopes in dBs (see /1/). This can be calculated when all mea-
surement results have been received from phone.
Repeat button (ALT+R):
The measurement can be started again by pressing this button.
Save button (ALT+S):
Dialog is closed and tuning is saved to phone.
Cancel button (ESC):
Dialog is closed and tuning is not saved to phone.
When calibration is ended, the DAC value checking is made and if it is not
succeeded, error message is shown.
When exit is made, the next selections are set to the values which were
selected before this adjustment.
Operation Mode
Update RF Information window
The exit and the use of AGC–control values is done same way as exit
from power level tuning and power coefficient use.
Page 38
PAMS
Technical Documentation
Issue 1 07/99