User Guide

RM-94

Nokia Customer Care 6(b) - RF Troubleshooting

26 COMPANY CONFIDENTIAL Issue 1 04/2005

EDGE

Ensure that GMSK is ok.

■ GSM1900 transmitter

General instructions for GSM1900 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 1900

Active unit TX

Operation mode Burst

RX/TX Channel 661

TX Power Level 5

TX Data Type Random

Edge Off

Use Phoenix to select

TX_Data Type: All 1

EDGE: On

TX Power Level: 5

Ch700

Ensure Vbatt=3.6 V

Yes

Oscilloscope

C7702

IREF_900

V = 1.83 Volt Check

C7711

Mode

V = 1.8 Volt No Baseband

VPCTRL_900

R7715

Vdc= 2.7 V

Yes

Spectrum analyzer Check PA N7700

RF@Test-Jig No Check Power Loop

Pout

= +21.5 dBm, 1747.8

MHz

(TXC, RFin 1800 1900,

DET)

Yes

GSM 1800 TX