User Guide

RH-37

6(b) - RF Troubleshooting Instructions Nokia Customer Care

Page 28 Nokia Corporation Issue 1 07/04

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 troubleshoot-

ing”.

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