Nokia 6020b Service Manual

 RM-31

Nokia Customer Care                                 3 - Service Software and Tuning Instructions

48

COMPANY CONFIDENTIAL

Issue 1 03/2005

Copyright © 2005 Nokia. All Rights Reserved.

Otherwise continue Rx calibration according to the tuning steps 2 and 3 for GSM1800 respec-
tively GSM1900 bands. Note the limits of the calibration mentioned in the list above.

Pop up window for Rx calibration of GSM1800 band

Calibration fails and possible reasons:

• If the whole calibration fails, the low band receiver chain (GSM850) or the synthe-
sizer part (including reference oscillator) might be defective.

• If Rssi3 and Rssi6 are within the limits, all other Rssi values are valid, too. If one 
of them or both are out of limits, the low band receiver part has to be checked.

• If AFC value or AFC slope fails, but the Rssi values are within the limits, the 
VCTCXO G7501 or UEM D200 might be defective.

This alignment is necessary to compensate the frequency response of the RX band filters 
(SAW filters).

Open the window <Rx Band Filter Response Compensation> in Phoenix Service Software as 
follows:

Select

Tuning

Alt-U

 

Rx Band Filter Response 
Compensation

Alt-C

Phoenix automatically selects the low band.

Select

Tuning mode Manual (Radio Button)

Connect an RF signal generator to the antenna port of the test jig respectively the phone. 

If a radio communication tester (CMD 55, CMU 200, HP 8960, MT 8801) is used, assure that 
<continuous mode> is switched on and <modulation> switched off.

Compensate for external RF cable and test jig losses.

Make sure that the <Input Signal Level (dBm)> field is set to -60 [dBm].