User Guide

RM-94

Nokia Customer Care 6(b) - RF Troubleshooting

22 COMPANY CONFIDENTIAL Issue 1 04/2005

EDGE

Ensure that GMSK is ok.

■ GSM1800 transmitter

General instructions for GSM1800 TX troubleshooting

Start the preparations as described in chapter “General instructions for TX troubleshooting”.

GMSK

Set operating mode to local mode.

Select Testing RF Controls

Wait until the RF Controls window pops up

Select Band GSM 1800

Active unit TX

Operation mode Burst

RX/TX Channel 700

TX Power Level 5

TX Data Type Random

Edge Off

Use Phoenix to select

TX_Data Type: All 1

EDGE: On

TX Power Level: 10

Ch37

Ensure Vbatt=3.6 V

Yes

Oscilloscope

C7702

IREF01

V ~ 1.77 Volt Check

C7711

Mode

V = 1.8 Volt No Baseband

VPCTRL_900

R7713

V= 2.7 V

Yes

Spectrum analyzer Check PA N7700

RF@Test-Jig No Check Power Loop

Pout

= +24.5 dBm, 897.4MHz

(TXC,Rfin 900, DET)

Yes

GSM900 TX