Introduction; Internal Antenna Is Missing - Nokia RH-77 Troubleshooting Manual

Nokia Customer Care

Introduction

This troubleshooting guide addresses potential failures that can affect antenna
performance of the mobile terminal, and discusses methods for correction of these
failures.

Internal Antenna is Missing

IHF speaker
pins
If no internal antenna is installed, the antenna gain is degraded by more than 25 dB.
• If the internal antenna is missing, install a new one.
• If the radiator looks obviously damaged, replace the internal antenna.
Damaged RF Feed Pin or Ground Pin
RF pin
IHF speaker
pins
Figure 2: Top (left) and bottom (right) views of the 2118 (RH-77) internal antenna
If the RF feed does not touch the PWB, then the antenna gain will degrade by more than
25dB. If the ground pin does not touch the PWB, then the antenna gain may degrade
from 5—10 dB.
Replace the internal antenna if any of the following situations apply:
• Either the RF feed pin or ground pin are broken or bent such that either pin will
not touch the PWB
Issue 01 04/2005
RF feed Ground pin
Figure 1: Chassis assembly
Ground pin
Spacer
©2005 Nokia Corporation
Antenna Description and Troubleshooting
IHF speaker
Ground pin
port
Company Confidential
2118 (RH-77)
RF shield
RF pin
Radiator
Page 3