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Private Communication Systems

Mobile Phones

Service Manual C25 / C2588

V 1.0

ICP CD ST

R. Fleuren

Sm_C25_lvl2_v10_w97

Page

of 32

02/99

Table of Contents

INTRODUCTION ......................................................................................................................................... 2

TABLE OF CONTENTS .............................................................................................................................. 3

TECHNICAL DATA..................................................................................................................................... 5

GENERAL INFORMATION....................................................................................................................... 6

MECHANICAL CONCEPT ........................................................................................................................ 6

4.1

ECHANICAL DRAWING

........................................................................................................................... 8

4.2

ECESSARY TOOLS

................................................................................................................................... 9

4.3

ISASSEMBLING THE

C25......................................................................................................................... 9

4.4

SSEMBLING THE

C25............................................................................................................................ 12

4.5

ANDSET

ATECODES

........................................................................................................................... 15

HARDWARE CONCEPT .......................................................................................................................... 16

5.1

LOCK

IAGRAM

................................................................................................................................... 16

5.2

ARDWARE

ESCRIPTION

...................................................................................................................... 17

5.3

OWER

UPPLY

ONCEPT

...................................................................................................................... 19

5.4

VERVOLTAGE

ONDITIONS

.................................................................................................................. 20

SOFTWARE PROGRAMMING............................................................................................................... 21

6.1

ARDWARE OVERVIEW

.......................................................................................................................... 21

6.2

ESCRIPTION OF SOFTWARE BOOTING

.................................................................................................... 21

6.2

ANGUAGE

ROUPS

............................................................................................................................... 22

BATTERY.................................................................................................................................................... 23

7.1

PECIFICATION

....................................................................................................................................... 23

7.2

HARGING

.............................................................................................................................................. 24

7.3

HORT

IRCUIT

ROTECTION

................................................................................................................. 24

7.4

EEP

ISCHARGE

................................................................................................................................... 25

7.5

ATTERY

ATECODES

........................................................................................................................... 26

UNBLOCKING ........................................................................................................................................... 27

8.1

IEMENS

OTLINE

.................................................................................................................................. 27

8.2

NTERNET SOLUTION

............................................................................................................................... 28

ACCESSORIES........................................................................................................................................... 29

9.1

TANDARD

HARGER

(

INCLUDED IN PACKAGE

)...................................................................................... 29

9.2

ATTERY

(

INCLUDED IN PACKAGE

) ........................................................................................................ 29

9.3

PARE

ATTERY

..................................................................................................................................... 30

9.4

APID

HARGER

.................................................................................................................................... 30

9.5

RAVEL

HARGER

................................................................................................................................. 30

9.6

ESK

HARGER

.............................................................................................................................. 30

9.7

ESIGNER

ASES

................................................................................................................................... 30

9.8

ELT

LIP

.............................................................................................................................................. 31

9.9

EADSET

................................................................................................................................................ 31

9.10

RADLE

.......................................................................................................................................... 31

9.11

NTENNA CRADLE

.................................................................................................................................. 31

9.12

HARGER

....................................................................................................................................... 32

9.13

ORTABLE

................................................................................................................................ 32

9.14

OMFORT

................................................................................................................................ 32

Summary of Contents for C25

Page 1: ...Private Communication Systems Mobile Phones Service Manual C25 C2588 V 1 0 ICP CD ST R Fleuren Sm_C25_lvl2_v10_w97 Page 1 of 32 02 99 Service Manual for C25 C2588 V 1 0 ...

Page 2: ... information on level 2 5 repairs or on the testequipment please refer to the available documentation The repairs for C25 and C2588 are identical unless otherwise noted and therefor in the text only C25 is mentioned Attention It must be noted that all repairs have to be carried out in an environment set up according to the ESD Electrostatic Discharge Sensitive Devices regulations defined in intern...

Page 3: ... 5 4 OVERVOLTAGE CONDITIONS 20 6 SOFTWARE PROGRAMMING 21 6 1 HARDWARE OVERVIEW 21 6 2 DESCRIPTION OF SOFTWARE BOOTING 21 6 2 LANGUAGE GROUPS 22 7 BATTERY 23 7 1 SPECIFICATION 23 7 2 CHARGING 24 7 3 SHORT CIRCUIT PROTECTION 24 7 4 DEEP DISCHARGE 25 7 5 BATTERY DATECODES 26 8 UNBLOCKING 27 8 1 SIEMENS HOTLINE 27 8 2 INTERNET SOLUTION 28 9 ACCESSORIES 29 9 1 STANDARD CHARGER INCLUDED IN PACKAGE 29 9 ...

Page 4: ...Private Communication Systems Mobile Phones Service Manual C25 C2588 V 1 0 ICP CD ST R Fleuren Sm_C25_lvl2_v10_w97 Page 4 of 32 02 99 9 15 CAR HANDSET 32 ...

Page 5: ... to 100 hours Talk time Up to 5 hours Charging time up to 6 hours with Standard Charger up to 1 5 hours with Rapid Charger optional Display C25 3 lines of 12 characters each 1 dedicated icon line C2588 Graphical display 97 33 pixels SIM Card Type Plug In 3V Attention 5V SIM not supported Antenna Non retractable Lambda 2 helix type Plug In Accessories a Standard Standard Charger Battery 3 6V 700mAh...

Page 6: ...s equipped with a graphical display of 97 33 pixels which enables the telephone to display chinese characters to the user 4 Mechanical Concept Note All part numbers refer to mechanical drawing in section 4 1 The mechanical concept of the C25 differs in various points from the one of the other Siemens mobile telephones The first thing you will experience is how the housing is locked In C25 no screw...

Page 7: ...t this cable This improves RF properties of the mobile and lowers production costs To be able to do measurements on and software update of the telephone an adapter cable between Molex and Lumberg connector will be available For details please refer to the chapter Software Programming of this manual As already for C1x mobiles also C25 antenna 1130 is of a plug in type inserted into the lower case s...

Page 8: ...nes Service Manual C25 C2588 V 1 0 ICP CD ST R Fleuren Sm_C25_lvl2_v10_w97 Page 8 of 32 02 99 4 1 Mechanical drawing Note The numbers shown above are NO ordering numbers For ordering please use the partnumbers supplied by your service manager ...

Page 9: ...e C25 the following Case Opener is mandatory Ordering number of Case Opener F30032 P46 A1 4 3 Disassembling the C25 Attention ESD regulations have to be followed 1 You first remove the battery lid and then the battery below 2 Now you remove the SIM card 3 Then you pull the antenna out 4 Open the housing with the opening tool and carefully pull the lower housing section off ...

Page 10: ...ow you remove the battery contacts from the lower housing section 6 Remove the card reader from the lower housing section 7 Remove the microphone from the lower housing section 8 After that you disconnect the ringer plug in connector 9 You then remove the ringer from the lower HF screen lid 10 Remove the clip from the lower HF screen lid ...

Page 11: ... mat retaining clip and the loudspeaker from the upper housing section Attention The loudspeaker is glued to the upper housing section by a foam covered with glue on both sides When you remove it the foam may be damaged 13 Carefully release the display from the radio and control module and fold it downwards 14 Finally you carefully release the retaining clip 1 of the plug in connector and pull the...

Page 12: ...isplay exactly the synthetic projection on the lower side of the display frame must be fitted into the hole in the screen lid The catches must fully engage 3 Place the keypad mat the loudspeaker and its retaining clip in the upper housing section Note Please first remove the protective foil from the loudspeaker 4 Then check whether the HF screens have been properly secured Subsequently you place t...

Page 13: ...ug in connector 8 Fasten the microphone in the lower housing section Attention The microphone contacts must not be dirty damaged or bent 9 Fasten the card reader in the lower housing section Attention The card reader must not be dirty damaged or bent 10 Fasten the battery contacts in the lower housing section Attention The battery contacts must not be dirty damaged or bent 11 Now close the device ...

Page 14: ...C25 C2588 V 1 0 ICP CD ST R Fleuren Sm_C25_lvl2_v10_w97 Page 14 of 32 02 99 12 Push the antenna in 13 Now insert the SIM card 14 Finally you insert the battery and close the battery compartment with the battery lid 15 Now you have assembled the phone completely ...

Page 15: ...062 to indicate the production service dates The code is printed on the IMEI sticker located in the battery compartment YY Datecode The first character of the datecode indicates the year of production F 1995 H 1996 J 1997 K 1998 L 1999 The second character indicates the month of production 1 9 january to september O october N november D december Example L1 means that the set was produced in januar...

Page 16: ...Private Communication Systems Mobile Phones Service Manual C25 C2588 V 1 0 ICP CD ST R Fleuren Sm_C25_lvl2_v10_w97 Page 16 of 32 02 99 5 Hardware Concept 5 1 Block Diagram ...

Page 17: ...ore it does the speech and channel encoding and the GSMK modulation of the Tx I Q signals 2 GOLD SX PMB 2709 The coprocessor PMB 2709 is used to realize advanced features regarding coding of the speech signal These are Halfrate Encoding Halfrate Decoding Enhanced Fullrate Encoding Enhanced Fullrate Decoding Voice Activity Detection Comfort Noise 3 GAIM PMB 2905 The GAIM GAIM GSM Analog Interfacing...

Page 18: ...signal to the baseband generating and inphase I and a quadrature Q signal Offset compensation for the I Q signals 5 Transmitter Circuit PMB 2255 This circuit provides the IF synthesizer the I Q modulator prescalers to regulate the RF synthesizer and a buffer stage to feed the PA The antenna switch is mechanical located in the connector for the external antenna ...

Page 19: ...ccessory list via the Lumberg connector at the bottom of the telephone Since the battery voltage is supplying the power supply asic it is always needed to operate the phone You cannot switch on the handset if the battery voltage is not present From the battery voltage all other supply voltages of the C25 are derived controlled by the power supply ASIC The RF power amplifier needs an operation volt...

Page 20: ... the switching on functionality ON_OFF button or Ignition signal During testing ist is advisable to use a battery dummy connected to a power supply delivering 4V max 3A Make sure that you connect the battery dummy with the right polarity the red plug to 4V and the blue plug to ground If you use a voltage higher than 7V or with wrong polarity the phone can be damaged 5 4 Overvoltage Conditions a Ba...

Page 21: ...ed 6 2 Description of software booting F Connect COM port of PC to the bootadapter using the enclosed RS232 cable F Connect adapter cable to the connection cable of the bootadapter F Afterwards plug in AC Adapter If connected correctly the Power lamp on the bootadapter will be active F Switch off the handset and connect it to the adapter cable F Copy bootsoftware to the PC and follow the instructi...

Page 22: ...lowing languages will be available They will be separated into different language groups Bahasan Indonesia Bahasan Malaysia Catalan Cestina Danish Dutch English Finnish French German Greek Hungar Italian Norsk Polish Portu Russian Spanish Swedish Turkish Attention This information is subject to change Contact your service coordinator for the latest update and ordering numbers ...

Page 23: ...ells are of a green colour Maxell s ones are bluish The connections BATT and GND are used to supply the phone with power The connector BATT_TEMP can be used by the mobile to measure the temperature of the battery cells Insertion of battery To insert the battery the right way round on the housing inside the battery compartment of C25 and on the battery there are two arrows which have to mach each o...

Page 24: ...mobile where Standard Quick or Travel charger are connected to Ø Travel charger Ø Car charger Attention Charging the battery can be impossible if the temperature is too high e g in car use during summer or too low This is to prevent the battery from being damaged during fast charge process To enable the charging process again battery and phone only needs to cool down warm up A replacement of batte...

Page 25: ...ltage has exceeded a certain level During trickle charge the charging symbol will not be visible and the telephone can not be turned on This is because the battery voltage is too low to operate the telephone Action Insert battery into handset and connect travel charger to the telephone Wait for appr 1 hour then disconnect and reconnect charger If the battery voltage is high enough again the chargi...

Page 26: ... Month of production Jan 1 Feb 2 Oct O Nov N Dec D 08 Day of production 1 st 1 2 nd 2 3 rd 3 31 st 31 20 Week of cell production M Factory code M UK E Germany Example K 7 08 20 M This battery was produced on July 8 th of 1998 b Varta batteries The datecode printed on the battery looks like this TOS 8 G9 VA 1 Explanation TOS Battery cells supplied by Toshiba 8 Revision level G Year of production 19...

Page 27: ...y be resetted by entering the right unblocking code This unblocking code is derived from the IMEI number of the mobile and can only be calculated in two different ways 8 1 Siemens Hotline You can retreive the code from our hotline personell in Germany If you need unblocking codes just send a fax with the IMEI numbers to Siemens AG PN MP SH World Service Center Bocholt Germany Fax 49 2871 91 3007 P...

Page 28: ...vember 1997 an internet solution is offered to the LSO It is a password protected internet homepage where you can enter the IMEI number of the affected handset The page will then present Master Phone Codes Master Network Codes and Master Service Provider Codes if applicable to the relevant telephone If you do not have access to this tool up to now please contact your Siemens service manager for de...

Page 29: ... included in package Specifications Ø NiMH 3 6V 700mAh Ø Standby time up to 100 hours Ø Talk time up to 5 hours Ø Charging time Approx 5 hours with Standard charger Approx 1 5 hours with Rapid charger M Mo ob bi il le e P Ph ho on ne e A Ac cc ce es ss so or ry y P Pr ro og gr ra am m Batteries Charging Car Environment Desktop Solutions Design Carry Battery 700 mAh Headset Travel Charger Belt Clip...

Page 30: ...vel Charger is similar to the Rapid Charger but enables the user to use the worldwide voltage range of 90 270 Volts Ø Compact size 5 versions available EU UK US Taiwan China Australia Ø Operating voltage 90 270V Ø Quick charging time approx 1 5 hrs Ø Power supply for Phone Desk Top Charger 9 6 Desk Top Charger The desktop charger forms a convenient stand for the mobile It enables easy drop in char...

Page 31: ...igital quality Ø Automatic call acceptance controlled by mobile phone menue Ø Comfort fixation 9 10 Car Cradle The car cradle is supplied with an adjustable bracket This enables secure and convenient siting of the telephone Ø Secure phone hold Ø Safety supplement for in car use Ø Individual angle positioning Ø Park position for Car Charger etc Ø Comfort release 9 11 Antenna cradle This robust crad...

Page 32: ...ceptance Ø Permanent display illumination Ø Volume control over side key or on mobile Ø Rotatable speaker Ø Variable microfone positioning Ø LED indicates function mode 9 14 Car Kit Comfort Ø High quality duplex handsfree Ø Power supply and battery charging Ø Radio mute Ø Auto answer on off Ø Ignition detection Ø Permanent display illumination Ø Auto power off via ignition switch Ø Seperate E Box ...

Page 33: ...Information and Communication Products Communication Devices V1 2 Page 1 of 34 ICP CD ST D Schnoor 8 99 C25 88 Level 2 5 Repair Documentation V 1 2 ...

Page 34: ...nternally this C25 is therefore called C25V4 The level 2 5 parts are identical to the old C25 version This manual is intended to help you carry out repairs on level 2 5 meaning limited component repairs Failure highlights are documented and should be repaired in the local workshops It must be noted that all repairs have to be carried out in an environment set up according to the ESD Electrostatic ...

Page 35: ... 2 Page 3 of 34 ICP CD ST D Schnoor 8 99 Table of Contents 1 INTRODUCTION 2 2 ANTENNA CONNECTOR 4 3 RINGER CONNECTOR 8 4 BOTTOM CONNECTOR LUMBERG 11 5 18µH COIL 14 6 ANTENNA SPRING 18 7 DISPLAY CONNECTOR 21 8 DISPLAY CAPACITORS 25 9 RINGER COIL 29 10 KEYPAD LEDS 32 ...

Page 36: ...nna carkit No location update possible on external antenna carkit 2 2 2 Fault Symptom on GSM Tester Output power problems on the external antenna No location update possible 2 2 3 Component Information The Antenna Connector is a mechanical switch operated by the RF plug of a carkit or for testing purposes of an RF clip Normally the RF signal goes to and comes from the internal antenna Whenever an ...

Page 37: ...ation 2 4 1 Description of procedure 2 4 1 1 Diagnosis Check the output power of the handset with the LSO testprogram Especially watch the external antenna power 2 4 1 2 Repair by component change Use hot air blower to remove defective connector Avoid excessive heat Watch surrounding components Resolder new connector afterwards From Power Amplifier To Receiver To From Internal Antenna ...

Page 38: ... by SW Booting Not possible 2 4 1 4 Test Retest handset after repair as described above 2 4 2 List of needed material 2 4 2 1 Components C25 antenna connector Part Number L36334 Z93 C261 2 4 2 2 Jigs and Tools Hot Air Blower Soldering Iron 2 4 2 3 Special Tools None 2 4 2 4 Working materials Desolder Wick Braid Solder ...

Page 39: ... and Communication Products Communication Devices V1 2 Page 7 of 34 ICP CD ST D Schnoor 8 99 2 4 3 Drawings Figure 1 C25 Board Antenna Connector Side Top View Figure 2 C25 Antenna Connector Placement X400 Top View ...

Page 40: ...e C25 3 1 2 Affected IMEIs Date Codes All All 3 1 3 Affected SW Versions All 3 1 4 Fault Code for LSO reporting 3RIC 3 2 Fault Description 3 2 1 Fault Symptoms for customers Problems with the handset ringer No ringer tone audible 3 2 2 Fault Symptom on GSM Tester Handset fails ringer test 3 3 Priority p Mandatory x Repair p Optional p Not Yet Defined ...

Page 41: ...tch for bent contacts and dry joints 3 4 1 2 Repair by component change Resolder dry soldering joints If the connector is physically damaged use hot air blower or wick to remove defective connector Avoid excessive heat Watch surrounding components Resolder new connector afterwards 3 4 1 3 Repair by SW Booting Not possible 3 4 1 4 Test Retest handset after repair 3 4 2 List of needed material 3 4 2...

Page 42: ...tion Devices V1 2 Page 10 of 34 ICP CD ST D Schnoor 8 99 3 4 2 3 Special Tools None 3 4 2 4 Working materials Desolder Wick Braid Solder Flux 3 4 3 Drawings Figure 1 C25 Board Ringer Connector Side Figure 2 C25 Ringer Connector X5 Placement Top View ...

Page 43: ...ffected SW Versions All 4 1 4 Fault Code for LSO reporting 3LUC 4 2 Fault Description 4 2 1 Fault Symptoms for customers Charging problems Problems with external loudspeaker or microphone when using a car kit Problems with accessories connected at the bottom connector 4 2 2 Fault Symptom on GSM Tester Testequipment cannot communicate with the handset 4 3 Priority p Mandatory x Repair p Optional p ...

Page 44: ... 4 1 2 Repair by component change Use hot air blower remove defective bottom connector Avoid excessive heat Watch surrounding components Resolder new bottom connector afterwards 4 4 1 3 Repair by SW Booting Not possible 4 4 1 4 Test Retest handset after repair 4 4 2 List of needed material 4 4 2 1 Components Bottom Connector C25 Part Number L36334 Z93 C262 4 4 2 2 Jigs and Tools Hot Air Blower Sol...

Page 45: ...oducts Communication Devices V1 2 Page 13 of 34 ICP CD ST D Schnoor 8 99 4 4 2 4 Working materials Desolder Wick Braid Solder 4 4 3 Drawings Figure 1 C25 Board Bottom Connector Side Figure 2 C25 Bottom Connector X4 Placement Top View ...

Page 46: ...5 5 1 2 Affected IMEIs Date Codes All All 5 1 3 Affected SW Versions All 5 1 4 Fault Code for LSO reporting 3COI 5 2 Fault Description 5 2 1 Fault Symptoms for customers Loud humming noise in loudspeaker 5 2 2 Fault Symptom on GSM Tester Handset fails with loud humming noise in echo loop 5 3 Priority p Mandatory x Repair p Optional p Not Yet Defined ...

Page 47: ...ken it produces heavy interference with the acoustical elements of the C25 resulting in a loud humming noise in the earpiece A broken coil can easily be diagnosed by trying to move it with two fingers If it moves the core is broken and the coil has to be replaced 5 4 1 2 Repair by component change Use hot air to remove defective coil Avoid excessive heat Watch surrounding components Resolder new c...

Page 48: ...V1 2 Page 16 of 34 ICP CD ST D Schnoor 8 99 5 4 2 List of needed material 5 4 2 1 Components 18µH Coil Part Number L36151 F5183 M 5 4 2 2 Jigs and Tools Soldering Iron Hot Air Blower 5 4 2 3 Special Tools None 5 4 2 4 Working materials Desolder Wick Braid Solder ...

Page 49: ...nformation and Communication Products Communication Devices V1 2 Page 17 of 34 ICP CD ST D Schnoor 8 99 5 4 3 Drawings Figure 1 C25 Board 18µH Coil L201 Side Figure 2 C25 18µH Coil L1 Placement Top View ...

Page 50: ...6 1 2 Affected IMEIs Date Codes All All 6 1 3 Affected SW Versions All 6 1 4 Fault Code for LSO reporting 3ANS 6 2 Fault Description 6 2 1 Fault Symptoms for customers Network Search Handset drops calls 6 2 2 Fault Symptom on GSM Tester Power problems on the internal antenna of the handset only 6 3 Priority p Mandatory x Repair p Optional p Not Yet Defined ...

Page 51: ...ly check the status of the spring Bent or oxidated springs have to be replaced 6 4 1 2 Repair by component change Use soldering iron to remove defective spring Avoid excessive heat Watch surrounding components Resolder new spring afterwards 6 4 1 3 Repair by SW Booting Not possible 6 4 1 4 Test Retest handset after repair 6 4 2 List of needed material 6 4 2 1 Components Antenna Spring C25 Part Num...

Page 52: ...nication Devices V1 2 Page 20 of 34 ICP CD ST D Schnoor 8 99 6 4 2 3 Special Tools None 6 4 2 4 Working materials Desolder Wick Braid Solder 6 4 3 Drawings Figure 1 C25 Board Antenna Spring Side Figure 2 C25 Antenna Spring X401 Placement Top View ...

Page 53: ...ype C25 7 1 2 Affected IMEIs Date Codes All All 7 1 3 Affected SW Versions All 7 1 4 Fault Code for LSO reporting 3DIC 7 2 Fault Description 7 2 1 Fault Symptoms for customers Display problems Missing Lines or columns on the LCD 7 2 2 Fault Symptom on GSM Tester Handset fails display test 7 3 Priority p Mandatory x Repair p Optional p Not Yet Defined ...

Page 54: ...ge Use soldering iron to resolder dry joints or use hot air blower to remove defective connector Avoid excessive heat Watch surrounding components Resolder new connector afterwards 7 4 1 3 Repair by SW Booting Not possible 7 4 1 4 Test Retest handset after repair 7 4 2 List of needed material 7 4 2 1 Components Remark Both C25 and C2588 use the same connector but the placement position is slightly...

Page 55: ...1 2 Page 23 of 34 ICP CD ST D Schnoor 8 99 7 4 2 3 Special Tools None 7 4 2 4 Working materials Desolder Wick Braid Solder 7 4 3 Drawings Figure 2 C25 Display Connector X3 and C2588 Display Connector X2 Placement Top View Figure 1 C25 Board Display Connector Side ...

Page 56: ...Information and Communication Products Communication Devices V1 2 Page 24 of 34 ICP CD ST D Schnoor 8 99 ...

Page 57: ...C25 8 1 2 Affected IMEIs Date Codes All All 8 1 3 Affected SW Versions All 8 1 4 Fault Code for LSO reporting 3DCA 8 2 Fault Description 8 2 1 Fault Symptoms for customers The display is not working at all or shows strange characters 8 2 2 Fault Symptom on GSM Tester Handset fails display test 8 3 Priority p Mandatory x Repair p Optional p Not Yet Defined ...

Page 58: ...citance with a appropriate measurement device The capacitance must be in the 220nF range Defective caps often have a lower capacitance around 100nF 8 4 1 2 Repair by component change Use hot air blower or soldering iron to remove defective capacitor Avoid excessive heat Watch surrounding components Resolder new capacitor afterwards 8 4 1 3 Repair by SW Booting Not possible 8 4 1 4 Test Retest hand...

Page 59: ...Devices V1 2 Page 27 of 34 ICP CD ST D Schnoor 8 99 8 4 2 3 Special Tools None 8 4 2 4 Working materials Desolder Wick Braid Solder 8 4 3 Drawings Figure 2 C25 Display Capacitor C301 C302 C304 C307 C308 Placement Figure 1 C25 Board Display Capacitor Side ...

Page 60: ...Information and Communication Products Communication Devices V1 2 Page 28 of 34 ICP CD ST D Schnoor 8 99 C301 C308 C307 C304 C302 ...

Page 61: ...2 Affected IMEIs Date Codes All All 9 1 3 Affected SW Versions All 9 1 4 Fault Code for LSO reporting 3RCO 9 2 Fault Description 9 2 1 Fault Symptoms for customers The handset ringer buzzer is not working or the Ringer level is too low 9 2 2 Fault Symptom on GSM Tester Handset fails ringer test 9 3 Priority p Mandatory x Repair p Optional p Not Yet Defined ...

Page 62: ...il by measuring its resistance with a multimeter The resistance must be very low Also broken coils have to be replaced 9 4 1 2 Repair by component change Use hot air blower or soldering iron to remove defective coil Avoid excessive heat Watch surrounding components Resolder new coil afterwards 9 4 1 3 Repair by SW Booting Not possible 9 4 1 4 Test Retest handset after repair 9 4 2 List of needed m...

Page 63: ...mmunication Devices V1 2 Page 31 of 34 ICP CD ST D Schnoor 8 99 9 4 2 3 Special Tools None 9 4 2 4 Working materials Desolder Wick Braid Solder 9 4 3 Drawings Figure 2 C25 Ringer Coil L300 Placement Top View Figure 1 C25 Board Ringer Coil Side ...

Page 64: ...fected IMEIs Date Codes All All 10 1 3 Affected SW Versions All 10 1 4 Fault Code for LSO reporting 3LED 10 2 Fault Description 10 2 1 Fault Symptoms for customers The display keypad illumination is not working properly 10 2 2 Fault Symptom on GSM Tester This fault cannot be tested with the GSM Tester 10 3 Priority p Mandatory x Repair p Optional p Not Yet Defined ...

Page 65: ... case and remove the keyboard Now visually check the function of the LEDs 10 4 1 2 Repair by component change Use hot air blower or soldering iron to remove defective LED Watch the polarity of the LED Avoid excessive heat Watch surrounding components Resolder new LED afterwards 10 4 1 3 Repair by SW Booting Not possible 10 4 1 4 Test Retest handset after repair 10 4 2 List of needed material 10 4 ...

Page 66: ...d Communication Products Communication Devices V1 2 Page 34 of 34 ICP CD ST D Schnoor 8 99 10 4 2 3 Special Tools None 10 4 2 4 Working materials Desolder Wick Braid Solder 10 4 3 Drawings Figure 1 C25 Board LED Side ...

Page 67: ......

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