Nokia 6020b Service Manual
RM-31
Nokia Customer Care 3 - Service Software and Tuning Instructions
58
COMPANY CONFIDENTIAL
Issue 1 03/2005
Copyright © 2005 Nokia. All Rights Reserved.
Adjust all power coefficients and the base level according to the target values.
Check if all levels match the target values, correct if necessary and then press < Save & Con-
tinue >.
tinue >.
Proceed with the 1900 MHz band.
TX I/Q tuning
This tuning must be performed in all three bands in GMSK mode and in EDGE mode.
The tuning is carried out exactly the same way in each band and is therefore described only
once.
once.
It is strongly recommended to use TXP as external trigger for all TX tunings. External triggering
gives the following advantages:
gives the following advantages:
• trigger for spectrum analyzer (gated sweep)
• trigger for oscilloscope
• trigger for power meter (avoid exchanging of attenuator and getting better accu-
racy)
racy)
Note: During Tx I/Q Tuning in GSM850 band, an additional calibration value for the battery volt-
age A/D converter is taken. Therefore, it is important to set the operating voltage to 3.6V for this
alignment (and use highest PL).
age A/D converter is taken. Therefore, it is important to set the operating voltage to 3.6V for this
alignment (and use highest PL).
Ensure that I/Q tuning in GSM850 band is executed as last I/Q-tuning (every I/Q-tuning over-
writes the calibration for the battery voltage).
writes the calibration for the battery voltage).
The VBAT value is detected and saved to PM.