Nokia N81 Service Manual

Energy management calibration
Prerequisites
Energy Management (EM) calibration is performed to calibrate the setting (gain and offset) of AD converters
in several channels (that is, battery voltage, BSI, battery current) to get an accurate AD conversion result.
Hardware setup:
• An external power supply is needed.
• Supply 12V DC from an external power supply to CU-4 to power up the phone.
• The phone must be connected to a CU-4 control unit with a product-specific flash adapter.
Steps
1. Place the phone to the docking station adapter (CU-4 is connected to the adapter).
2. Start Phoenix service software.
3. Choose File→ Scan Product.
4. Choose Tuning→Energy Management.
5. To show the current values in the phone memory, click Read, and check that communication between
the phone and CU-4 works.
6. Check that the CU-4 used check box is checked.
7. Select the item(s) to be calibrated.
Note: ADC calibration has to be performed before other item(s). However, if all calibrations are
selected at the same time, there is no need to perform the ADC calibration first.
8. Click Calibrate.
The calibration of the selected item(s) is carried out automatically.
The candidates for the new calibration values are shown in the
Calculated values column. If the new
calibration values seem to be acceptable (please refer to the following "Calibration value limits" table),
click Write to store the new calibration values to the phone permanent memory.
Table 4 Calibration value limits
Parameter Min. Max.
ADC Offset -20 20
ADC Gain 12000 14000
BSI Gain 1100 1300
VBAT Offset 2400 2650
VBAT Gain 19000 23000
VCHAR Gain N/A N/A
IBAT (ICal) Gain 7750 12250
9. Click Read, and confirm that the new calibration values are stored in the phone memory correctly. If the
values are not stored to the phone memory, click Write and/or repeat the procedure again.
10. To end the procedure, close the Energy Management Calibration window.
RM-179; RM-223
Baseband Troubleshooting
Page 3 –60 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