Nokia 6121, 308 Service Manual

Nokia Customer Care

Service Manual

RM-308 (Nokia 6121 classic; L3&4)

Mobile Terminal

Part No: 9205365 (Issue 1)

COMPANY CONFIDENTIAL

Amendment Record Sheet

Amendment No Date Inserted By Comments

Draft 1 07/2007 ET Issue 1 08/2007 ET

RM-308

Page ii COMPANY CONFIDENTIAL Issue 1

RM-308 Copyright

Copyright

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.

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RM-308

Warnings and cautions

Warnings

• 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.

• Never test a mobile phone WCDMA transmitter with full Tx power, if there is no possibility to perform the measurements in a good performance RF-shielded room. Even low power WCDMA transmitters may disturb nearby WCDMA networks and cause problems to 3G cellular phone communication in a wide area.

• During testing never activate the GSM or WCDMA transmitter without a proper antenna load, otherwise GSM or WCDMA PA may be damaged.

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RM-308 ESD protection

ESD protection

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

Nokia After Market Services representative.

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RM-308

Care and maintenance

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.

Page vi COMPANY CONFIDENTIAL Issue 1

RM-308 Company Policy

Company Policy

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

Issue 1 COMPANY CONFIDENTIAL Page vii

RM-308

Battery information

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.

Page viii COMPANY CONFIDENTIAL Issue 1

RM-308 Nokia 6121 classic; L3&4 Service Manual Structure

Nokia 6121 classic; L3&4 Service Manual Structure

1 General Information 2 Service Tools and Service Concepts 3 BB Troubleshooting and Manual Tuning Guide 4 RF troubleshooting 5 Camera Module Troubleshooting 6 System Module and User Interface Glossary

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RM-308

Nokia 6121 classic; L3&4 Service Manual Structure

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Nokia Customer Care

1 — General Information

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RM-308

General Information

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RM-308 General Information

Table of Contents

Product selection....................................................................................................................................................1–5

Product features and sales package.....................................................................................................................1–5

Product and module list ........................................................................................................................................1–7

Mobile enhancements............................................................................................................................................1–7

Technical specifications.........................................................................................................................................1–9

Transceiver general specifications ..................................................................................................................1–9

Main RF characteristics for GSM850/900/1800/1900 and WCDMA VIII (900) and WCDMA I (2100)

phones......................................................................................................................................................1–9

Battery endurance.......................................................................................................................................... 1–10

List of Tables

Table 1 Audio..........................................................................................................................................................1–7

Table 2 Car...............................................................................................................................................................1–8

Table 3 Data & positioning....................................................................................................................................1–8

Table 4 Messaging..................................................................................................................................................1–9

Table 5 Music ..........................................................................................................................................................1–9

Table 6 Power.........................................................................................................................................................1–9

List of Figures

Figure 1 View of RM-308........................................................................................................................................1–5

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RM-308

General Information

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RM-308 General Information

Product selection

RM-308 is a GSM/HSDPA/WCDMA tri-mode handportable monoblock phone. It supports EGSM850/900/1800/1900 and WCDMA900/2100 bands, and CSD/HSCSD, GPRS/EGPRS, WCDMA/HSDPA data bearers.

For WCDMA the maximum bit rate is up to 384 kbit/s for downlink and 384 kbit/s for uplink with simultaneous CS speech or CS video (max. 64 kbit/s). The HSDPA peak is 3.6Mbps (with limited use cases).

For GPRS/EGPRS networks the RM-308 is a Class B EGPRS MSC 32 (5 Rx + 3 Tx, max sum 6), which means a maximum download speed of up to 296 kbit/s with EGPRS, and up to 107 kbit/s with GPRS. RM-308 also supports Dual Transfer Mode (DTM) for simultaneous voice and packet data connection in GSM/EDGE networks; simple class A, multi slot class 11, (4 Rx + 3 Tx, max sum 5 ), UL/DL=236.8/177.6 kbit/s.

RM-308 has a large 2.0’’ QVGA (320x240 pixels) TFT display with 16 million colors, a 2 Megapixel main camera that has a 4 x digital zoom and an integrated flash, and a 2nd CIF camera for video calls.

RM-308 is an MMS (Multimedia Messaging Service) enabled multimedia device. The MMS implementation follows the OMA MMS standard release 1.2. RM-308 also supports the Bluetooth 2.0 + EDR standard.

RM-308 uses Symbian (S60, release 3.1) operating system and supports the full Web Browser for S60, which brings desktop-like Web browsing experience to mobile devices.

RM-308 also supports MIDP Java 2.0, providing a good platform for compelling 3rd party applications.

Figure 1 View of RM-308

Product features and sales package

Bearers and transport

• WCDMA DL 384kbit/s, UL 384 kbit/s

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RM-308

General Information

• HSDPA up to 3.6Mbps

• GPRS/EGPRS Class B, Multi slot class 32

• Dual Transfer Mode (DTM) class A, multi slot class 11 (4 Rx+3Tx=5)

Connectivity

• Bluetooth 2.0 + EDR (SIM Access, Headset & Handsfree, A2DP profiles)

• USB2.0 Full Speed with mini-USB interface

• MicroSD memory card - support up to 2GB

• 2.5 mm AV Connector

Display

• Large 2.0’’ QVGA (320x240 pixels) TFT display with 16 million colors

Imaging and video

• Integrated 2 megapixel digital camera with 4x smooth digital zoom and landscape mode, integrated LED flash.

•

2nd CIF camera for video calls

• Video streaming and playback with H.264 (MPEG4), 3gpp, Real codecs

• Video recording in H.263 (3gpp) and MPEG4

• Video Sharing in 3G networks (SWIS), VS2.2 version

Music

• Music player supporting MP3, MP4, eAAC+ and WMA

• True tones, MP3/AAC and MIDI ringing tones up to 64 polyphonies

• Stereo FM Radio / Visual radio™

Productivity

Context management

• OMA client provisioning

• PIM (Calendar + Contacts)

• OTA provisioning & over the air SW update (FOTA)

• Nokia PC Suite connectivity with USB, Bluetooth

• Active Standby

• Local/remote SyncML data sync

• Web Browser (OSS), Java ™ MIDP 2.0, XHTML browsing over TCP/IP

Messaging

• Common inbox (SMS, MMS), MMS: OMA MMS 1.2

• Push E-mail (IMAP4 idle and OMA EMN) with attachment viewers (Excel, PowerPoint, Word)

• Audio Messaging (AMS)

Voice

• Rich Calls: Push to Talk (PoC), 2-way video conferencing (Video Call), Video Sharing

• Voice commands, enhanced voice dialling (SIND)

• Audio message reader for text messages and E-mail

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RM-308 General Information

Add-on software framework

• Symbian 9.x OS

• Nokia Series 60, 3rd edition, feature pack 3.1

• Java: MIDP2.0

Additional technical specifications

• Vibrating alert

• 3GPP Rel 4compliant

• Speech codecs supported in WCDMA: AMR

• Speech codecs supported in GSM: AMR, EFR, FR, HR

• 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

Sales package

• Transceiver RM-308

• Charger (AC-4)

• Battery (BL-5B)

• Stereo headset (HS-47)

• Mini USB connectivity cable (DKE-2)

• CD-ROM

• Short User Guide (full User Guide online + CS help)

Product and module list

Module name Type code Notes

System/RF Module 2AR Main PWB with components. UI Flex Module 2AS

Mobile enhancements

Table 1 Audio

Enhancement Type

Wired headsets HS-40

HS-47 HS-81

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Enhancement Type

Wireless headsets HDW-3

HS-4W HS-11W HS-13W HS-21W HS-26W HS-36W HS-37W

Loopsets TTY adapter HDA-11

Table 2 Car

Enhancement Type

RM-308

General Information

Mobile holder CR-39 Mobile holder mounting device HH-12 Mobile charger DC-4 Car kit N616 Wireless car kit CK-1W

CK-7W

CK-20W Wireless plug-in car handsfree HF-6W Car phone N810 Privacy handset HSU-4

Table 3 Data & positioning

Enhancement Type

MicroSD card, 128MB MU-26 MicroSD card, 256MB MU-27 MicroSD card, 512MB MU-28 MicroSD card, 1GB MU-22 MicroSD card, 2GB MU-37 Mini USB connectivity adapter cable DKE-2 Wireless GPS module LD-3W

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RM-308 General Information

Table 4 Messaging

Enhancement Type

Digital pen SU-27W Wireless keyboard SU-8W

Table 5 Music

Enhancement Type

Mini speakers MD-4

Table 6 Power

Enhancement Type

Battery Li-Ion 890 mAh BL-5B Travel charger AC-3

AC-4 AC-5

Charger adapter CA-44

Technical specifications

Transceiver general specifications

Unit Dimensions (L x W x T)

Transceiver with BL-5B 890 mAh Li-Ion battery back

(mm)

105 x 46 x 15 89 66

Weight (g) Volume (cm3)

Main RF characteristics for GSM850/900/1800/1900 and WCDMA VIII (900) and WCDMA I (2100) phones

Parameter Unit

Cellular system GSM850, EGSM900, GSM1800/1900, WCDMA VIII

(900) and WCDMA I (2100)

Rx frequency band GSM850: 869 - 894 MHz

EGSM900: 925 - 960 MHz GSM1800: 1805 - 1880 MHz GSM1900: 1930 - 1990 MHz WCDMA VIII (900): 925- 960 MHz WCDMA I (2100): 2110 - 2170 MHz

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General Information

Parameter Unit

Tx frequency band GSM850: 824 - 849 MHz

EGSM900: 880 - 915 MHz GSM1800: 1710 - 1785 MHz GSM1900: 1850 - 1910 MHz WCDMA VIII (900): 880 - 915 MHz WCDMA I (2100): 1920 - 1980 MHz

Output power GSM850: +5 ...+33dBm/3.2mW ... 2W

GSM900: +5 … +33dBm/3.2mW … 2W GSM1800: +0 … +30dBm/1.0mW … 1W GSM1900: +0 … +30dBm/1.0mW … 1W WCDMA VIII (900): -50 ... +24 dBm/0.01μW ...

251.2mW WCDMA I (2100): -50 ... +24 dBm/0.01μW ...

251.2mW

RM-308

Number of RF channels GSM850: 124

GSM900: 174 GSM1800: 374 GSM1900: 299 WCDMA VIII (900): 152

WCDMA I (2100): 277 Channel spacing 200 kHz Number of Tx power levels GSM850: 15

GSM900: 15

GSM1800: 16

GSM1900: 16

WCDMA VIII (900): 75

WCDMA I (2100): 75

Battery endurance

Battery Capacity (mAh) Talk time Stand-by

BL-5B 890 up to 190 min (GSM)

up to 150 min (WCDMA)

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up to 9 days (GSM) up to 9 days (WCDMA)

RM-308 General Information

Charging times

AC-4

80 min

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RM-308

General Information

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Nokia Customer Care

2 — Service Tools and Service

Concepts

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Service Tools and Service Concepts

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RM-308 Service Tools and Service Concepts

Table of Contents

Service tools............................................................................................................................................................2–5

Product specific tools........................................................................................................................................2–5

FS-63..............................................................................................................................................................2–5

MJ-135 ...........................................................................................................................................................2–5

RJ-176 ............................................................................................................................................................2–5

SA-134 ...........................................................................................................................................................2–6

General tools......................................................................................................................................................2–6

CU-4................................................................................................................................................................2–7

FLS-5 ..............................................................................................................................................................2–8

FPS-10............................................................................................................................................................2–8

JXS-1...............................................................................................................................................................2–8

PK-1................................................................................................................................................................2–9

PKD-1 .............................................................................................................................................................2–9

RJ-157 ............................................................................................................................................................2–9

RJ-160 ............................................................................................................................................................2–9

RJ-169 ......................................................................................................................................................... 2–10

RJ-73 ........................................................................................................................................................... 2–10

RJ-93 ........................................................................................................................................................... 2–10

SB-6............................................................................................................................................................. 2–10

SPS-1........................................................................................................................................................... 2–11

SPS-2........................................................................................................................................................... 2–11

SRT-6........................................................................................................................................................... 2–11

SS-102......................................................................................................................................................... 2–11

SS-46........................................................................................................................................................... 2–12

SS-62........................................................................................................................................................... 2–12

SS-93........................................................................................................................................................... 2–12

ST-29........................................................................................................................................................... 2–12

ST-40........................................................................................................................................................... 2–12

ST-55........................................................................................................................................................... 2–13

ST-59........................................................................................................................................................... 2–13

SX-4............................................................................................................................................................. 2–13

Cables............................................................................................................................................................... 2–13

CA-31D ........................................................................................................................................................ 2–13

CA-35S......................................................................................................................................................... 2–14

CA-58RS....................................................................................................................................................... 2–14

DAU-9S........................................................................................................................................................ 2–14

DKE-2........................................................................................................................................................... 2–14

PCS-1........................................................................................................................................................... 2–15

XCS-4........................................................................................................................................................... 2–15

XRS-6........................................................................................................................................................... 2–15

Service concepts .................................................................................................................................................. 2–16

POS (Point of Sale) flash concept .................................................................................................................. 2–16

Flash concept with FPS-10............................................................................................................................. 2–17

CU-4 flash concept with FPS-10..................................................................................................................... 2–18

Module jig service concept............................................................................................................................ 2–19

RF testing concept with RF coupler .............................................................................................................. 2–20

Service concept for RF testing and RF/BB tuning........................................................................................ 2–21

List of Tables

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RM-308

Service Tools and Service Concepts

Table 7 Attenuation values ................................................................................................................................ 2–14

List of Figures

Figure 2 POS flash concept ................................................................................................................................. 2–16

Figure 3 Basic flash concept with FPS-10.......................................................................................................... 2–17

Figure 4 CU-4 flash concept with FPS-10........................................................................................................... 2–18

Figure 5 Module jig service concept .................................................................................................................. 2–19

Figure 6 RF testing concept with RF coupler .................................................................................................... 2–20

Figure 7 Service concept for RF testing and RF/BB tuning .............................................................................. 2–21

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RM-308 Service Tools and Service Concepts

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-308, refer to various concepts.

FS-63 Flash adapter For flashing (also dead phones) with SS-46. RF testing and tuning, and

EM calibration on ATO level with SS-62 (mechanical locking concept), CU-4 supported.

MJ-135 Module jig MJ-135 is meant for troubleshooting, testing, tuning and flashing on

the engine level (CU-4 supported). The jig includes an RF interface for GSM, WCDMA and Bluetooth.

RJ-176 Soldering jig RJ-176 is a soldering jig used for soldering and as a rework jig for the

engine module.

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RM-308

Service Tools and Service Concepts

SA-134 RF coupler SA-134 is an RF coupler for WCDMA and GSM RF testing. It is used

together with the product-specific flash adapter. The following table shows attenuations from the antenna pads of the

mobile terminal to the SMA connectors of SA-134 . The setup used for measuring the values is SA-134 + FS-63 + CU-4.

•

Attenuation values for inductive RF coupler SA-134

Band Channel Attenuation TX Attenuation RX

128 3.7 2.8

GSM 850

GSM 900

GSM

1800

GSM

1900

WCDMA

Band I

190 3.4 2.3 251 3.2 2.3

975 3.4 4.3 37 3.4 1.8 124 3.6 3.8

512 9.5 13.7 700 8 10.7 885 7.3 10

512 10.8 9.7 661 9.6 9.7 810 9.4 9.7

9612 8.9 9750 10.3 9888 8.9 10562 11.3 10700 11.3 10838 10.8

2712 3.3 2788 3.7

WCDMA

Band VIII

2863 3.4 2937 4.3 3013 4.3 3088 4.3

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-308, refer to various concepts.

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RM-308 Service Tools and Service Concepts

CU-4 Control 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.

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RM-308

Service Tools and Service Concepts

FLS-5 Flash device FLS-5 is a dongle and flash device incorporated into one package,

developed specifically for POS use.

Note: FLS-5 can be used as an alternative to PKD-1.

FPS-10 Flash prommer FPS-10 interfaces with:

• PC

• Control unit

• Flash adapter

• Smart card FPS-10 flash prommer features:

• Flash functionality for BB5 and DCT-4 terminals

• Smart Card reader for SX-2 or SX-4

• USB traffic forwarding

• USB to FBUS/Flashbus conversion

• LAN to FBUS/Flashbus and USB conversion

• Vusb output switchable by PC command FPS-10 sales package includes:

• FPS-10 prommer

• Power Supply with 5 country specific cords

• USB cable

Note: FPS-21 is substitute FPS-10 if FPS-10 has not been set

up.

JXS-1 RF shield box Because the WCDMA network disturbs the RX side testing of the WCDMA

phone and the Tx signal of the WCDMA phone can severely disturb the WCDMA network, a shield box is needed in all testing, tuning and fault finding which requires WCDMA RF signal.

The shield box is not an active device, it contains only passive filtering components for RF attenuation.

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