without the prior written permission of Nokia is prohibited.
Nokia, Nokia Connecting People, and Nokia X and Y are trademarks or registered trademarks of Nokia
Corporation. Other product and company names mentioned herein may be trademarks or tradenames of
their respective owners.
Nokia operates a policy of continuous development. Nokia reserves the right to make changes and
improvements to any of the products described in this document without prior notice.
Under no circumstances shall Nokia be responsible for any loss of data or income or any special, incidental,
consequential or indirect damages howsoever caused.
The contents of this document are provided "as is". Except as required by applicable law, no warranties of
any kind, either express or implied, including, but not limited to, the implied warranties of merchantability
and fitness for a particular purpose, are made in relation to the accuracy, reliability or contents of this
document. Nokia reserves the right to revise this document or withdraw it at any time without prior notice.
The availability of particular products may vary by region.
IMPORTANT
This document is intended for use by qualified service personnel only.
• IF THE DEVICE CAN BE INSTALLED IN A VEHICLE, CARE MUST BE TAKEN ON INSTALLATION IN VEHICLES FITTED
WITH ELECTRONIC ENGINE MANAGEMENT SYSTEMS AND ANTI-SKID BRAKING SYSTEMS. UNDER CERTAIN FAULT
CONDITIONS, EMITTED RF ENERGY CAN AFFECT THEIR OPERATION. IF NECESSARY, CONSULT THE VEHICLE DEALER/
MANUFACTURER TO DETERMINE THE IMMUNITY OF VEHICLE ELECTRONIC SYSTEMS TO RF ENERGY.
• THE PRODUCT MUST NOT BE OPERATED IN AREAS LIKELY TO CONTAIN POTENTIALLY EXPLOSIVE ATMOSPHERES,
FOR EXAMPLE, PETROL STATIONS (SERVICE STATIONS), BLASTING AREAS ETC.
• OPERATION OF ANY RADIO TRANSMITTING EQUIPMENT, INCLUDING CELLULAR TELEPHONES, MAY INTERFERE
WITH THE FUNCTIONALITY OF INADEQUATELY PROTECTED MEDICAL DEVICES. CONSULT A PHYSICIAN OR THE
MANUFACTURER OF THE MEDICAL DEVICE IF YOU HAVE ANY QUESTIONS. OTHER ELECTRONIC EQUIPMENT MAY
ALSO BE SUBJECT TO INTERFERENCE.
• BEFORE MAKING ANY TEST CONNECTIONS, MAKE SURE YOU HAVE SWITCHED OFF ALL EQUIPMENT.
Cautions
• Servicing and alignment must be undertaken by qualified personnel only.
• Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.
• Ensure solder, wire, or foreign matter does not enter the telephone as damage may result.
• Use only approved components as specified in the parts list.
• Ensure all components, modules, screws and insulators are correctly re-fitted after servicing and
alignment.
• Ensure all cables and wires are repositioned correctly.
• During testing never activate the GSM transmitter without a proper antenna load, otherwise GSM PA may
be damaged.
Nokia requires that service points have sufficient ESD protection (against static electricity) when servicing
the phone.
Any product of which the covers are removed must be handled with ESD protection. The SIM card can be
replaced without ESD protection if the product is otherwise ready for use.
To replace the covers ESD protection must be applied.
All electronic parts of the product are susceptible to ESD. Resistors, too, can be damaged by static electricity
discharge.
All ESD sensitive parts must be packed in metallized protective bags during shipping and handling outside
any ESD Protected Area (EPA).
Every repair action involving opening the product or handling the product components must be done under
ESD protection.
ESD protected spare part packages MUST NOT be opened/closed out of an ESD Protected Area.
For more information and local requirements about ESD protection and ESD Protected Area, contact your local
This product is of superior design and craftsmanship and should be treated with care. The suggestions below
will help you to fulfil any warranty obligations and to enjoy this product for many years.
• Keep the phone and all its parts and accessories out of the reach of small children.
• Keep the phone dry. Precipitation, humidity and all types of liquids or moisture can contain minerals that
will corrode electronic circuits.
• Do not use or store the phone in dusty, dirty areas. Its moving parts can be damaged.
• Do not store the phone in hot areas. High temperatures can shorten the life of electronic devices, damage
batteries, and warp or melt certain plastics.
• Do not store the phone in cold areas. When it warms up (to its normal temperature), moisture can form
inside, which may damage electronic circuit boards.
• Do not drop, knock or shake the phone. Rough handling can break internal circuit boards.
• Do not use harsh chemicals, cleaning solvents, or strong detergents to clean the phone.
• Do not paint the phone. Paint can clog the moving parts and prevent proper operation.
• Use only the supplied or an approved replacement antenna. Unauthorised antennas, modifications or
attachments could damage the phone and may violate regulations governing radio devices.
All of the above suggestions apply equally to the product, battery, charger or any accessory.
Our policy is of continuous development; details of all technical modifications will be included with service
bulletins.
While every endeavour has been made to ensure the accuracy of this document, some errors may exist. If
any errors are found by the reader, NOKIA MOBILE PHONES Business Group should be notified in writing/email.
Please state:
• Title of the Document + Issue Number/Date of publication
• Latest Amendment Number (if applicable)
• Page(s) and/or Figure(s) in error
Please send to:
NOKIA CORPORATION
Nokia Mobile Phones Business Group
Nokia Customer Care
PO Box 86
FIN-24101 SALO
Finland
E-mail: Service.Manuals@nokia.com
Note: A new battery's full performance is achieved only after two or three complete charge and
discharge cycles!
The battery can be charged and discharged hundreds of times but it will eventually wear out. When the
operating time (talk-time and standby time) is noticeably shorter than normal, it is time to buy a new battery.
Use only batteries approved by the phone manufacturer and recharge the battery only with the chargers
approved by the manufacturer. Unplug the charger when not in use. Do not leave the battery connected to
a charger for longer than a week, since overcharging may shorten its lifetime. If left unused a fully charged
battery will discharge itself over time.
Temperature extremes can affect the ability of your battery to charge.
For good operation times with Ni-Cd/NiMh batteries, discharge the battery from time to time by leaving the
product switched on until it turns itself off (or by using the battery discharge facility of any approved accessory
available for the product). Do not attempt to discharge the battery by any other means.
Use the battery only for its intended purpose.
Never use any charger or battery which is damaged.
Do not short-circuit the battery. Accidental short-circuiting can occur when a metallic object (coin, clip or
pen) causes direct connection of the + and - terminals of the battery (metal strips on the battery) for example
when you carry a spare battery in your pocket or purse. Short-circuiting the terminals may damage the battery
or the connecting object.
Leaving the battery in hot or cold places, such as in a closed car in summer or winter conditions, will reduce
the capacity and lifetime of the battery. Always try to keep the battery between 15°C and 25°C (59°F and 77°
F). A phone with a hot or cold battery may temporarily not work, even when the battery is fully charged.
Batteries' performance is particularly limited in temperatures well below freezing.
Do not dispose of batteries in a fire!
Dispose of batteries according to local regulations (e.g. recycling). Do not dispose as household waste.
RM-135
Nokia N76 Service Manual StructureNokia Customer Care
Nokia N76 Service Manual Structure
1 General Information
2 Service Software Instructions
3 Service Tools and Service Concepts
4 BB Troubleshooting and Manual Tuning Guide
5 RF troubleshooting
6 Camera Module Troubleshooting
7 System Module and User Interface
Glossary
Product features and sales package.....................................................................................................................1–6
Product and module list ........................................................................................................................................1–8
Mobile enhancements............................................................................................................................................1–8
Transceiver general specifications ............................................................................................................... 1–10
Main RF characteristics for GSM850/900/1800/1900 and WCDMA2100 phones ...................................... 1–10
RM-135 is a WCDMA/GSM dual mode handportable phone. It supports EGSM850/900/1800/1900 and
WCDMA2100.
RM-135 is a 3GPP Release 4 terminal supporting CSD/HCSD, GPRS/EGPRS and WCDMA data bearers. For WCDMA
the maximum bit rate is up to 384 kbps for downlink and 384 kbps for uplink with simultaneous CS speech
or CS video (max. 64 kbps).
For 2G and 2.5G networks the RM-135 is a Class B EGPRS MSC 32, which means a in maximum download speed
of up to 296kbit/s with EGPRS, and up to 107kbit/s with GPRS. According to GSM standard 05.05 it responds
to class 4 (max. 2W) in GSM 850 and EGSM 900, class 1 (1W) is DCS 1800, and class 1 in PCS 1900.
RM-135 supports Bluetooth 2.0 + EDR standard and two-way video calls with two integrated cameras, on the
front and one on the back. The main camera is an integrated 2 Megapixel camera with a digital zoom and
the secondary CIF camera is for video calls.
RM-135 is an MMS (Multimedia Messaging Service) enabled multimedia device. The MMS implementation
follows the OMA MMS standard release 1.2. It has a large 2.4’’ QVGA (320x240 pixels) TFT main display with
16 million colors, and a smaller 1,36” (128x160 pixels) TFT secondary display with 262k colors.
The HTML browser is a highly advanced internet browser also capable of viewing operator domain XHTML
Mobile Profile (MP) content.
RM-135 uses Symbian 9.x (S60) operating system and supports also MIDP Java 2.0, providing a good platform
for compelling 3rd party applications.
• WCDMA HSDPA 2100 MHz with simultaneous voice and packet data (PS max speed DL/UL= 384kbps/
384kbps, CS max speed 64kbps)
• Dual Transfer Mode (DTM) support for simultaneous voice and packet data connection in GSM/EDGE
networks. Simple class A, multi slot class 11, max speed DL/UL: 236.8/177.6kbits/s
• EGPRS class B, multi slot class 32, (5 Rx + 3 Tx / max sum 6), max speed DL/UL= 296 / 177.6 kbits/s)
• GPRS class B, multi slot class 32 (5 Rx + 3 Tx / max sum 6), max speed DL/UL= 107 / 64.2 kbits/s)
RM-135
Service Software InstructionsNokia Customer Care
Table of Contents
Phoenix installation steps in brief........................................................................................................................2–5
Phone data package overview........................................................................................................................... 2–11
Installing phone data package .......................................................................................................................... 2–12
Uninstalling phone data package...................................................................................................................... 2–15
Configuring users in Phoenix ............................................................................................................................. 2–17
Managing connections in Phoenix..................................................................................................................... 2–17
Installing flash support files for FPS-10 ............................................................................................................ 2–20
Dead phone USB flashing.................................................................................................................................... 2–24
List of Figures
Figure 2 Dongle not found ....................................................................................................................................2–6
Figure 15 New user configured.......................................................................................................................... 2–17
5. Manage connection settings (depends on the tools you are using).
If you use FPS-10:• Update FPS-10 software
Note: There is no need to activate FPS-10.
• Activate SX-4 smart card, if you need tuning and
testing functions.
Note: When FPS-10 is used only for
product software updates, SX-4 smart
card is not needed.
Results
Phoenix
is ready to be used with FPS-10 flash prommer and other service tools.
Installing
Phoenix
Prerequisites
• Check that a dongle is attached to the parallel or USB port of your computer.
• Download the
computer (in
• Close all other programs.
• Depending on your operating system, administrator rights may be required to install
• If uninstalling or rebooting is needed at any point, you will be prompted by the InstallShield program.
Phoenix
C:\TEMP
installation package (for example,
, for instance).
phoenix_service_sw_2004_39_x_xx.exe
Phoenix
) to your
.
Context
At some point during the installation procedure, you may get the following message:
Figure 2 Dongle not found
This may be a result of a defective or too old PKD-1 dongle.
Check the COM/parallel ports or USB ports used. After correcting the problem, you can restart the installation.
For more detailed information, please refer to
Tip: Each feature in
program. Press the F1 key or the feature’s Help button to activate a Help file.
Phoenix
has its own Help function, which can be activated while running the
Phoenix
Help files.
Steps
1. To start the installation, run the application file (for example,
RM-135
Service Software InstructionsNokia Customer Care
3. Read the disclaimer text carefully and click Yes.
Figure 3 Disclaimer text
4. Choose the destination folder.
The default folder
C:\ProgramFiles\Nokia\Phoenix
is recommended.
5. To continue, click Next.
To choose another location, click Browse (not recommended).
6. Wait for the components to be copied.
The progress of the installation is shown in the
Setup Status
window.
7. Wait for the drivers to be installed and updated.
The process may take several minutes to complete.
If the operating system does not require rebooting, the PC components are registered right away.
If the operating system requires restarting your computer, the Install Shield Wizard will notifies about it.
Select Yes... to reboot the PC immediately or No... to reboot the PC manually afterwards.
After the reboot, all components are registered.
Note:
Phoenix
does not work, if the components have not been registered.
• installing phone model specific data package for
• configuring users and connections
FPS-10 flash prommer can be used after updating their flash update package files. FLS-5 flash prommer can
also be used.
Updating
Phoenix
Phoenix
can be used after:
Phoenix
installation
Context
• If you already have the
software when new versions are released.
• To update
• When you are updating, for example, from version a14_2004_16_4_47 to a15_2004_24_7_55, the update
will take place automatically without uninstallation.
• Always use the latest available versions of both
can be found in the phone model specific Technical Bulletins and phone data package
(shown during installation).
• If you try to update
a15_2004_24_7_55), you are asked if you want to uninstall the existing version. In this case you can choose
between a total uninstallation or a repair installation in a similar way when choosing to uninstall the
application from the
Phoenix
Phoenix
, you need to follow the same steps as when installing it for the first time.
service software installed on your computer, you need to update the
Phoenix
and the phone-specific data package. Instructions
readme.txt
Phoenix
Windows
with the same version you already have (for example, a15_2004_24_7_55 to
RM-135
Service Software InstructionsNokia Customer Care
If the operating system requires rebooting, InstallShield Wizard will notify you. Select Yes... to reboot the
PC immediately and No... to reboot the PC manually afterwards.
Repairing
Phoenix
installation
Context
If you experience any problems with the service software or suspect that files have been lost, use the repair
function before completely reinstalling
Note: The original installation package (for example,
must be found on your PC when you run the repair setup.
Phoenix
.
phoenix_service_sw_a15_2004_24_7_55.exe
Steps
1. Open Windows Control Panel→Add/Remove Programs .
2. Choose Phoenix Service Software→Change/Remove .
3. In the following view, select Repair.
)
Figure 8 Repair program
Phoenix
The procedure is the same as when updating
4. To complete the repair, click Finish.
reinstalls components and registers them.
Phoenix
.
Phone data package overview
Each product has its own data package (DP). The product data package contains all product-specific data files
to make the Phoenix service software and tools usable with a certain phone model.
4. Select Manual mode, and click Next to continue.
If you want to create the connection using the Connection Wizard, connect the tools and a phone to your
PC. The wizard will automatically try to configure the correct connection.
Figure 16 Select mode: Manual
iFor an FPS-10 flash prommer with a USB Connection, choose the following connection settings:
• Media: FPS-10 USB
• DEVICE_INDEX: 0
• SERIAL_NUM: See Serial No from the label attached to the bottom of FPS-10
• ACTIVE_MEDIA: USB
iiFor an FPS-10 flash prommer with a LAN connection, choose the following connection settings:
• Media: FPS-10 TCP/IP
• NET_SERV_NAME: Click Scan.... Choose your own FPS-10 device based on the correct MAC address.
See Serial No from the label attached to the bottom of your FPS-10.
• PORT_NUM: Use the default value, and click Next.
• PROTOCOL_FAMILY: Use the default value, and click Next.
• SOCKET TYPE: Use the default value, and click Next.
• TX_BUFFER_SIZE: Use the default value, and click Next.
• RX_BUFFER_SIZE: Use the default value, and click Next.
iii For a plain USB connection, choose the following connection settings:
Note: First connect the DKE-2 cable between the PC USB port and phone.
6. Click the connection you want to activate. Use the up/down arrows located on the right hand side to move
it on top of the list, then click Apply.
Figure 17 Connections list
The connection is activated, and it can be used after closing the
The connection information is shown at the right hand bottom corner of the screen.
Figure 18 Connection information
7. To use the connection, connect the phone to your PC with correct service tools. Make sure the phone is
switched on, and then choose File→Scan Product .
Manage Connection
window.
Results
The product support module information appears in the status bar:
Figure 19 Product support module information (example from RM-1)
Installing flash support files for FPS-10
Prerequisites
• Install
• Install phone model specific data package for
• If you want to update the flash support files, they are delivered in the same installation package with
Phoenix
In case you want to update the MCU files, install the latest data package (see Technical Bulletins for
information on the latest one).
Normally, it is enough to install
always includes the latest flash update package files for FPS-10.
• A separate installation package for flash support files is available. The files can be updated according to
these instructions, if updates appear between
Phoenix
or newer
service software.
Phoenix
packages beginning from beginning from April 2007.
Phoenix
Phoenix
and the phone-specific data package because the installation
Phoenix
.
data package releases.
Context
If you are not using a separate installation package, you can skip this section and continue with "Updating
FPS-10 flash prommer software" (page 2–23) after installing a new phone data package.
RM-135
Service Software InstructionsNokia Customer Care
• Phone specific data package
• Phone which does not start after interrupted flash process
Steps
1. To prepare the flashing process, run Phoenix service software and log in.
2. Chose File→Manage Connections and activate No Connection. Use the up/down arrows located in the
right hand side to move it on top of the list, then click Apply.
After closing the Manage Connection window the no connection symbol is shown at the right hand bottom
corner of the screen.
3. Choose the product manually from File→Open product and click OK. Wait for the phone type designator
(e.g. RM-135) to be displayed in the status bar.
4. Go to Flashing→Firmware Update and select the correct product code by clicking on the three spots
right hand next to the product code. All available product codes in the current data package are listed.
Activate the correct code and click OK.
The chosen product code is now shown with the software version according to the installed data package.
5. Select Dead Phone USB Flashing and connect the phone via USB cable.
6. Start the flashing process by clicking Start.
Flashing started and after a few seconds Phoenix wants to open a connection to the phone. Press the
power button of the phone if you are asked to. The flash process continues. Otherwise, flashing failed and
the procedure has to be repeated.
Progress messages on the screen show actions during phone programming, please wait.
Programming is completed when Flashing Completed message is displayed.
RM-135
Service Tools and Service ConceptsNokia Customer Care
Table of Contents
Service tools............................................................................................................................................................3–5
Product specific tools........................................................................................................................................3–5
General tools......................................................................................................................................................3–8
Service tools spare parts................................................................................................................................ 3–16
Coax cable assy for MJ-93 ......................................................................................................................... 3–16
Spare UI flex unit for MJ-93 ...................................................................................................................... 3–17
Service concepts .................................................................................................................................................. 3–17
POS (Point of Sale) flash concept .................................................................................................................. 3–17
Flash concept with FPS-10............................................................................................................................. 3–18
Flash concept with FLS-5 and SS-46 ............................................................................................................. 3–19
CU-4 flash concept with FPS-10..................................................................................................................... 3–20
Flash concept with FLS-5 and SS-62 ............................................................................................................. 3–21
Flash concept with FLS-5 and module jig .................................................................................................... 3–22
Module jig service concept............................................................................................................................ 3–23
Service concept for RF testing and RF/BB tuning........................................................................................ 3–24
RF/BB tuning and flashing with FPS-10 ....................................................................................................... 3–26
RF/BB tuning and flashing with FLS-5.......................................................................................................... 3–27
Bluetooth test concept with SB-6................................................................................................................. 3–28
Connecting to flash adapter............................................................................................................................... 3–29
RM-135
Service Tools and Service ConceptsNokia Customer Care
Service tools
Product specific tools
The table below gives a short overview of service tools that can be used for testing, error analysis and repair
of product RM-135, refer to various concepts.
FS-23Flash adapter
FS-23 is a product specific adapter for SW update and testing purposes.
It is compatible to SS-62 and SS-46. It provides galvanic connetion to
terminal test pads and battery connector.
Note: It is recommended to add a 3dB attenuator directly at
coupler SMA connector.
SS-112Camera recess 00 bit
¼” bit for the Torque screwdriver to be added as part of the service
box.
General tools
The table below gives a short overview of service tools that can be used for testing, error analysis and repair
of product RM-135, refer to various concepts.
RM-135
Service Tools and Service ConceptsNokia Customer Care
CU-4Control unit
CU-4 is a general service tool used with a module jig and/or a flash
adapter. It requires an external 12 V power supply.
The unit has the following features:
• software controlled via USB
• EM calibration function
• Forwards FBUS/Flashbus traffic to/from terminal
• Forwards USB traffic to/from terminal
• software controlled BSI values
• regulated VBATT voltage
• 2 x USB2.0 connector (Hub)
• FBUS and USB connections supported
When using CU-4, note the special order of connecting cables and
other service equipment:
Instructions
1 Connect a service tool (jig, flash adapter) to CU-4.
2 Connect CU-4 to your PC with a USB cable.
3 Connect supply voltage (12 V)
4 Connect an FBUS cable (if necessary).
5 Start Phoenix service software.
Note: Phoenix enables CU-4 regulators via USB when it is
started.
Reconnecting the power supply requires a Phoenix restart.
Nokia Customer CareService Tools and Service Concepts
RJ-93Rework jig
RJ-93 is used as a rework jig for the Front End Module (FEM).
This rework jig takes the FEM or power amplifier (PA) module (N7520)
for spreading the soldering paste to the component. Must be used
together with the ST-40 stencil.
SB-6Bluetooth test and
interface box (sales
package)
The SB-6 test box is a generic service device used to perform Bluetooth
bit error rate (BER) testing, and establishing cordless FBUS connection
via Bluetooth. An ACP-8x charger is needed for BER testing and an
AXS-4 cable in case of cordless interface usage testing .
Sales package includes:
• SB-6 test box
• Installation and warranty information
SPS-1Soldering Paste
Spreader
SRT-6Opening tool
SRT-6 is used to open phone covers and B-to-B connectors.
SS-46Interface adapter
SS-46 acts as an interface adapter between the flash adapter and
Nokia Customer CareService Tools and Service Concepts
SX-4Smart card
SX-4 is a BB5 security device used to protect critical features in tuning
and testing.
SX-4 is also needed together with FPS-10 when DCT-4 phones are
flashed.
Cables
The table below gives a short overview of service tools that can be used for testing, error analysis and repair
of product RM-135, refer to various concepts.
CA-31DUSB cable
The CA-31D USB cable is used to connect FPS-10 or FPS-11 to a PC. It is
included in the FPS-10 and FPS-11 sales packages.
CA-35SPower cable
CA-35S is a power cable for connecting, for example, the FPS-10 flash
prommer to the Point-Of-Sales (POS) flash adapter.
Nokia Customer CareService Tools and Service Concepts
XCS-4Modular cable
XCS-4 is a shielded (one specially shielded conductor) modular cable
for flashing and service purposes.
XRF-1RF cable
The RF cable is used to connect, for example, a module repair jig to
the RF measurement equipment.
SMA to N-Connector ca. 610mm.
Attenuation for:
• GSM850/900: 0.3+-0.1 dB
• GSM1800/1900: 0.5+-0.1 dB
• WLAN: 0.6+-0.1dB
XRS-6RF cable
The RF cable is used to connect, for example, a module repair jig to
the RF measurement equipment.
SMA to N-Connector approximately 610 mm.
Attenuation for:
• GSM850/900: 0.3+-0.1 dB
• GSM1800/1900: 0.5+-0.1 dB
• WLAN: 0.6+-0.1dB
Service tools spare parts
The table below gives a short overview of service tools that can be used for testing, error analysis and repair
of product RM-135, refer to various concepts.
Dead or jammed device troubleshooting............................................................................................................4–6
General power checking ........................................................................................................................................4–7
USB interface troubleshooting........................................................................................................................... 4–16
Power key troubleshooting................................................................................................................................ 4–23
EL foil backlight troubleshooting ................................................................................................................. 4–29
LED driver troubleshooting ........................................................................................................................... 4–30
Power LED troubleshooting .......................................................................................................................... 4–32
Bluetooth and FM radio ...................................................................................................................................... 4–34
Introduction to Bluetooth/FM Radio troubleshooting ............................................................................... 4–34
Bluetooth settings for Phoenix..................................................................................................................... 4–35
Bluetooth self tests in Phoenix..................................................................................................................... 4–36
Bluetooth troubleshooting ........................................................................................................................... 4–38
FM radio troubleshooting.............................................................................................................................. 4–38
Figure 41 Take single trig measurement for the rise of the BSI signal. ........................................................ 4–12
Figure 42 USB connector..................................................................................................................................... 4–17
Figure 43 Bluetooth antenna............................................................................................................................. 4–34
Figure 44 Bluetooth and FM radio component layout..................................................................................... 4–35
Figure 45 BER test result..................................................................................................................................... 4–36
Figure 46 Bluetooth self tests in Phoenix......................................................................................................... 4–37
Figure 47 Single-ended output waveform of the Ext_in_HP_out measurement when earpiece is
Nokia Customer CareBB Troubleshooting and Manual Tuning Guide
Backup battery troubleshooting
Verify that the backup battery is empty (U<1V). Switch the phone on. Measure voltage of the battery when
the main battery is connected to the phone and the phone is switched on.
Wait a few minutes and monitor that the backup battery voltage rises. Switch off the phone, disconnect the
main battery and monitor that the voltage of the backup battery decreases. Normal behaviour of the voltage
is described in the figures below.
Figure 39 Charging backup battery
Figure 40 Discharging backup battery
If the voltage rises and falls quickly, check whether either G2200 or C2234 is broken or short-circuited. Backup
battery can be also dead. If the voltage stays ~0V, check resistance VBACK against GND. If there is no short
circuit, AVILMA is faulty. Replace AVILMA.