Nokia NPD-1 Series Guide

CCS Technical Documentation

NPD-1 Series Transceivers

Issue 1 11/2002 Confidential Nokia Corporation

Troubleshooting — Antenna

NPD-1

Troubleshooting — Antenna CCS Technical Documentation

Page 2 Nokia Corporation Confidential Issue 1 11/2002

CCS Technical Documentation Troubleshooting — Antenna

NPD-1

Issue 1 11/2002 Nokia Corporation Confidential Page 3

Contents Page No

Troubleshooting - Antenna ............................................................................................ 5

Relevant Documents ................................................................................................. 5

Failures and Corrective Measures ...............................................................................5

Internal antenna not installed or unplated internal antenna installed........................ 5

Stamped contact spring clips missing/miss-installed for internal antenna................ 5

Bottom antenna clip bent or missing......................................................................... 6

Missing whip............................................................................................................. 6

Ungrounded display frame........................................................................................ 7

NPD-1

Troubleshooting — Antenna CCS Technical Documentation

Page 4 Nokia Corporation Confidential Issue 1 11/2002

CCS Technical Documentation Troubleshooting — Antenna

NPD-1

Issue 1 11/2002 Nokia Corporation Confidential Page 5

Troubleshooting - Antenna

This troubleshooting guide addresses potential failures that will affect the antenna per-

formance of the phone, and discusses methods for correction of these failures.

Relevant Documents

For additional information, refer to the Eagle Antenna Electromechanical Specifications

(DMS03311-EN-2.0) and the Eagle Antenna Module VQD (DMS00188-EN-1.2).

Failures and Corrective Measures

Internal antenna not installed or unplated internal antenna installed

A properly installed and plated Eagle antenna module is shown in Figure 1.

The Eagle antenna module consists of the internal antenna and whip antenna as one

module.

Figure 1: Eagle Antenna Module installed)

If the Eagle antenna module is missing, install one. If an unplated internal antenna is

installed, replace it with a properly plated internal antenna module.

If no internal antenna is installed, the antenna gain will be degraded by more than

25 dB.

Stamped contact spring clips missing/mis-installed for internal antenna

Figure 2 shows the RF feed and ground stamped contact spring clips properly installed.

Figure 3 shows both stamped contacts spring clips missing. If the either contact is miss-

ing or bent, replace antenna module with new antenna.

Figure 2: RF feed and ground stamped contact spring clips properly installed

NPD-1

Troubleshooting — Antenna CCS Technical Documentation

Page 6 Nokia Corporation Confidential Issue 1 11/2002

Figure 3: Stamped contact spring clips missing

Bottom antenna clip bent or missing

The bottom antenna clip is located near the bottom of the phone in the D-cover. A prop-

erly installed bottom antenna clip is shown in Figure 4.

Figure 4: Properly installed bottom antenna clip

If the bottom antenna clip is bent or missing, then it should be carefully replaced with a

new one.

The degradation in antenna performance is only about 2 to 4 dB in the receive portion of

the CELL band when the whip is retracted. PCS band, retracted whip, degradation will be

10 to 15 db.

Missing whip

If the whip is missing, then the Eagle antenna module should be replaced. Figure 5

shows a properly installed whip antenna.

CCS Technical Documentation Troubleshooting — Antenna

NPD-1

Issue 1 11/2002 Nokia Corporation Confidential Page 7

The whip will perform 2 dB better than the internal antenna in free space. The whip will

perform up to 3 dB better than the internal antenna in talk position.

Figure 5: Properly installed whip antenna

Ungrounded display frame

The display frame is normally grounded by two spring clips (Figures 6). The figure shows

the display frame grounding locations. If clips are missing or bent, replace light guide

with good one. SAR performance will degrade by .5 mW/g for one leg not grounding to

the PWB to over 1.7mW/g if both legs are not grounded.

Figure 6: Display frame grounded by two spring clips

The D cover and light guide have snaps near the display frame ground positions. Make

sure they are locked in position for ESD protection. These snap features help maintain

display leg contact with the PWB.

NPD-1

Troubleshooting — Antenna CCS Technical Documentation

Page 8 Nokia Corporation Confidential Issue 1 11/2002

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