Tuning Steps; Afc Tuning (Analog); Vctcxo Tuning - Nokia NSW-5 Series Service Manual

NSW-5
Tuning and Flashing Instructions

Tuning Steps

1. AFC Tuning (Analog)

This tuning adjusts reference oscillators frequency so that network's fre-
quency criterias will be met.
This adjustment loads the Analog center frequency DAC value into the
EEPROM. When doing this, a spectrum analyzer must be used.
Note: Do not leave tuning on. The analog transmitting takes maximium
current. The tunning can damage the phone or service battery. The ser-
vice battery will be heated.
The Spectrum analyzer settings are shown in AFC tuning window.
-Set power supply voltage 8.5 V to service battery (or 3.6 V to jig).
- Connect the spectrum analyzer to antenna connector.
- Check that spectrum analyzer frequence is correct.
- Tune the center frequence 832.500 Mhz +/- 200 Hz.
- Once Center frequence (CFR) is correct, press OK button.

2. VCTCXO Tuning

This tuning is to check that the radio unit has correct adjustment to meet
networks criteria for frequency stability.
This adjustment loads the VCTCXO DAC value into the EEPROM. RF
generator must be used in this.
The Spectrum analyzer settings are shown in AFC tuning window.
- Set power supply voltage 8.5 V to service battery (or 3.6 V to jig).
- Connect the antenna connector to RF generator.
- Once all RF generator frequency is correct, press Meas button.
- Set correct RF level to signal generator ( Note: attenuation! )
- Once frequency and RF level are correct press OK button.
3. Tx I/Q Modulator Amplitude Balance and Phase Shift Tuning
This tuning is to adjust IQ-modulators DC-offset and phase offset so that
the system requirements for modulation accuracy will be met.
– Select Tuning –> TX I/Q...
– Connect spectrum analyzer to antenna adapter or to diagnostic jig.
– Settings for spectrum analyzer:
Page 10
E 2000 Nokia Mobile Phones Ltd.
PAMS Technical Documentation
Issue 1 10/00