Nokia N81 Service Manual

Checking antenna functionality
The device has a main GSM and WCDMA 2100 antenna. The main antenna is the visible gold structure on the
black plastic carrier. The main antenna has six connections to the PWB via C-clips. The main antenna consist
of two radiator structures for quadband GSM/ WCDMA 2100 TX and a WCDMA 2100 RX.
The BT/Wlan antenna is the visible flexid PWB covered with black paint. The antenna is connected to the PWB
with two C-clips.
Main antenna functionality
The main antenna is an active antenna. It is functioning normally when the feeds and the GND have proper
connection to the PWB.
The radiator is made from a durable gold colored conductive layer. This layer has to be visually intact.
The main antenna functionality must be checked by measuring the transmitted power with an RF coupler at
GSM 1800 channel 610 and GSM 900 channel 37. The test in GSM 1800 and GSM 900 take care that the active
path (XGND) of the antenna is working.
Figure 35 Main antenna
RM-179; RM-223
RF troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 4 –25
Copyright © 2007 Nokia. All rights reserved.

Nokia N81 Specifications

General

Display diagonal	2.4 \
Display resolution	240 x 320 pixels
Display number of colors	16.78 million colors
Ringer type	Polyphonic
Internal memory	8196 MB
Front camera type	Single camera
Rear camera resolution	1600 x 1200 pixels
Personal info management (PIM)	Alarm clock, Calculator, Calendar, Notes, To-do list
Headphone connectivity	3.5 mm
USB 2.0 ports quantity	1
Text prediction system type	T9
Multimedia Messaging Service (MMS)	Multimedia Messaging Service (MMS) is a standard way to send messages that include multimedia content to and from a mobile phone over a cellular network
Form factor	Slider
Product color	Brown
Gaming time	6 h
Browsing time	5 h
Talk time (2G)	4 h
Talk time (3G)	3 h
Battery capacity	1050 mAh
Standby time (2G)	1020 h
Continuous audio playback time	11.5 h
Continuous video playback time	4.5 h
2G standards	GPRS
Data network	wcdma
Bluetooth version	2.0+EDR
Bluetooth profiles	A2DP, BIP, DUN, FTP, GAP, GOEP, HFP, HSP, OPP, SPP
SIM card capability	Single SIM

Weight and Dimensions

Depth	102 mm
Width	50 mm
Height	17.9 mm
Weight	140 g