Nokia N81 Service Manual

• Oscilloscope
• Function generator (sine waveform)
• Current probe (Internal handsfree PWM output measurement)
• Phoenix service software
• Power supply 3.7V
Test procedure
Ausio can be tested using Phoenix audio routings option. Four different audio loop paths can be activated:
• External mic to external earpiece
• External mic to internal earpiece
• External mic to internal handsfree speaker (IHF, mono signal to both speakers)
• Internal mic to external earpiece
Each audio loop sets routing from the specified input to the specified output enabling a quick in-out test.
Loop path gains are fixed an can not be changed using phoenix. Correct pins an signals for each test see
following table.
Phoenix audio loop tests and test results
The results presented in the table apply, when no accessory is connected. Earpiece, internal mic and speaker
are in place during measurement. Applying a headset accessory during measurement causes a significant
drop in measured levels.
The gain values presented in table apply for differential output vs single ended input.
Loop test Input
terminal
Output
terminal
Path gain
[dB] fixed
Input
Voltage
[mVpp]
Differenti
al
outputvol
tage
[mVpp]
Output DC
level [V]
Output
current
Ext Mic ->
Ext Earp
HS-MIC &
GND
HSEARL&G
ND
-8.6 1000 367 1,2
HSEARR&
GND
Ext Mic ->
Int Earp
HS-MIC &
GND
EarP &
GND
-10 1000 310 1,2
EarN &
GND
Ext Mic ->
Int Hands
Free
XMICP &
GND
B2150
B2151 all
terminals
8,5 920 2520 0 ~25mA
each
XMICN &
GND
Int Mic ->
Int Hands
Free
Acoustica
l input,
1khz sine
wave
IHF
Speakerp
ad
94 dB SPL -
Measurement data
Earpiece signal
RM-179; RM-223
Baseband Troubleshooting
Page 3 –42 COMPANY CONFIDENTIAL Issue 1
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