1. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential 1255 Technical Training Baseband Troubleshooting Presentation NMP-CDMA; San Diego Jan, 2006

2. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Disclaimer Materials current at time of publish and based upon most current R&D Documentation. Please refer to the latest product TB to determine further handset hardware variations if any.

3. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Introduction The mobile terminal uses a CDMA single mode engine (Cellular/ 800) with Qualcomm baseband consisting of following ASICs: Power Management IC,PM6610(PM) Mobile Station Modem processor,MSM6000(MSM) RFT6122 and RFR6122 are RF transmitter and receiver IC 32MB Flash memory with 8MB of pSRAM memory

4. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Functionality Block Diagram PM6610 Flash Memory & LCD RFR6122 RFT6122

5. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Power Distribution Block Diagram

6. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential PWB Bottom Side Power management IC RF transmitter TX saw filter power amplifier cell duplexer RF receiver RX saw filter MSM 6000 Flash IC 19.2MHz TCXO

7. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential PWB Overview - Top LCD_SER_A0 LCD_SER_CS_N Antenna connector LCD_SER_DATA LCD_SER_CLK Display connector LCM LEDs REC_P REC_N Keypad LEDs

8. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Based on the common Qualcomm engine, the major components are: Power Management - MSM6000-Mobile Station Modern Memory– 32Megabit Flash+8Megabit SRAM Audio – Earpiece, microphone, speaker Display – 96x65 dot matrix FSTN LCD module User interfaces Keypad RUIM Accessory – headset, charger, data cables etc… BB7.0 In Detail

9. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Subsystems within the MSM6000 device include a CDMA processor, a DFM processor, QCT’s QDSP2000™ DSP for voice compression,PLL and an ARM® ARM7TDMI microprocessor. Also integrated in the MSM6000 device are an audio voice codec and analog interfaces for the radioOne RF ASICs.Controllers for an R-UIM, GPIOs, and peripheral interfaces complete the system integration. MSM6000 Solution General Features RadioOne™ Zero Intermediate Frequency (ZIF)/Direct Conversion Architecture CDMA2000 1x Release 0 Supports IS-95-A and IS-95-B compliant CDMA and AMPS subscriber units Voice Centric (EVRC 8 kbps) 8x Searcher, plus an independently controlled 16x Searcher 2-way Short Message Service (SMS) Supports peak rates of 14.4 kpbs packet data in forward and reverse links simultaneously Mobile Station Modem

10. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential The PM6610 IC controls the power distribution to the whole mobile terminal through the baseband and RF regulators excluding the power amplifier (RF PA), which has a continuous power rail directly from the battery. The battery feeds power directly to the following parts of the system: PM6610 RF PA Vibrator Keyboard & LCD backlights Audio Amplifier Universal Energy Management

11. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential The main clock signal for the baseband is generated from the voltage and temperature controlled crystal oscillator VCTCXO. This 19.2 MHz clock signal is generated at the RF and fed to TCXO_IN. RF Clock – Analog/Digital

12. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential The UPP distributes a 19.2MHz Clock signal to the internal processors, the DSP and MCU, where SW multiplies this clock by seven for the DSP and by two for the MCU. RF Converter Clk

13. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential The 32.768 kHz crystal oscillator is the primary SLEEP clock source, when TCXO clocks are disabled to conserve power. The 32.768 kHz crystal oscillator signal is generated by an external crystal (plus two shunt capacitors) that supplemented by a PM internal inverter and buffer. Sleep Clock

14. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential A 9.6 MHz clock signal is used for SBI, which is used by the MSM to transfer data between the PMIC and MSM6000. The system clock is stopped during sleep mode by disabling the VREG_TCXO. The TCXO is turned off by the PMIC regulator which is from MSM’s TCXO_EN output signal. Serial Bus Interface (SBI) Clock

15. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Troubleshooting First, carry out a through visual check of the module. Ensure in particular that: There are no mechanical damages Soldered joints are okay ASIC orientations are okay Troubleshooting instructions are divided into the following sections: "Mobile Terminal is Totally Dead" "Flash Programming Does Not Work" "Power Does Not Stay on or the Mobile Terminal is Jammed" "Charger Faults" "Audio Faults" "Display Faults" "Keypad Faults"

16. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Mobile is dead Is the mobile terminal current is zero or too high? Is the current U < U 60 mA? Check RESIN_N signals. Is it high (2.8V)? Reflow or change MSM6000 Reflow/ change PM6610. Is flash programming OK? Check PS_HOLD signals. Is it high (2.9V)? Reflow or change MSM6000 Reflow or change PM6610 YES NO Check the “BSI” line at J700, C714, R709. Are they OK? YES NO YES NO Mobile Terminal is Dead Mobile Terminal is Jammed Flash Faults ♦ If current is zero, check L101, Q700, R710 and check the power on sequence. If there is no power output, reflow or change PM6610. ♦ If current is too high, check for shorts. ♦ Make sure all BB regulators are at their respective voltage levels (VREG_MSMA, VREG_MSMP, VREG_MSMC, VREG_TCXO). Reflow/ change PM6610 if necessary. NO YES Check ROM_CS_N (TP423). Is it toggling after RESIN_N goes high? YES NO Reflow or change the memory IC

17. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Current Limitations RegulatorMaximum Current (mA) Vout (V) Notes VREG_MSMC1502.75Enabled always except during power-off mode VREG_MSMP1502.95Enabled always except during power-off mode VREG_MSMA1502.6Enabled only when the system is powered on (Off during sleep and power-off modes) VREG_TCXO502.85Enabled only when the system is powered on (Off during sleep and power-off modes) VREG_RUIM1503.0Enabled only when RUIM card is used VREG_RFRX1502.65Enabled when the receiver is on VREG_RFTX1502.65Enabled when the transmitter is on

18. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Current Test Points

19. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Current @ Zero/Too High? 1.) Measure BB regulator voltage levels: VREG_MSMC – 2.75V, VREG_MSMP – 2.95V, VREG_MSMA – 2.6V, VREG_TCXO – 2.85V 2.) Voltage here should be the same as the one from power supply 3.) Voltage here should be 3.3V ~ 4.2V RESIN_N PS_HOLD

20. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Start-up Sequence

21. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Start-up Timing (1/2) 13ms<T RESET1 <30ms VREG_TCXO RESIN_N PS_HOLD PWR_ON_SENSE_N T REG1 < 10ms VREG_MSMA VREG_TCXO PWR_ON_SENSE_N VREG_MSMP VREG_MSMC

22. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Start-up Timing (2/2) T PSHOLD <133ms VREG_TCXO RESIN_N PS_HOLD PWR_ON_SENSE_N

23. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential The BSI Line If all of the above checks pass, then check whether terminal jammed or if flash faults exist. 1.) BSI Line @ J700 2.) BSI Line @ C714 3.) BSI Line @ R709 4.) VREG_TCXO – 2.85V Note: The BSI line must < 1.8V for proper operation

24. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential RXD = Data to Phone TXD = Data to PC VREG_MSMP = 2.95V When flash programming, the Flash Adatper uses the above signals to connect to the Phone. All logic voltage levels are 2.95V. Power is supplied to the phone using the battery contacts. Flash Interface/Signals

25. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Flash Faults Flash Faults Measure 19.2MHz RF CLK at testpoint. Is it OK? NO Measure the 19.2MHz CLK coming from the TCXO. Is it OK? NO Check/ change VREG_TCXO, Y702, R703, C704, C724, R714, C712, C722, R704, R413, and C403 YES Reflow or change MSM6000 Can the mobile terminal connect to PC via UART? NO YES Mobile Terminal is Jammed Reflow or change the memory IC Reflow or change the memory IC. Is it work? NO YES END YES Check ROM_CS_N (TP423) and WR_N (TP429). Are they toggling during programming? NO Reflow or change MSM6000

26. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Flash… 19.2MHz System Clock VREG_TCXO – 2.85V ROM_CS_N WR_N

27. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Jammed Terminal Mobile Terminal is Jammed Measure VREG_MSMP, VREG_MSMC, VREG_MSMA, and VREG_TCXO voltages. Are they OK? NO Check VPH_PWR, VREG_MSMP, VREG_MSMC, VREG_MSMA, and VREG_TCXO capacitors. Are they OK? NO Repair capacitors, reflow/ change TCXO/ PM6610 YES Check “BSI” line and VPH_PWR line. Are they OK? NO Reflow or change PM6610 YES Measure 32kHz Sleep CLK from testpoint. Is it OK? NO Measure the 32 kHz clock crystal. Is it OK? NO Change Y700 YES Reflow or change PM6610 Measure 19.2MHz RF CLK at testpoint. Is it OK? NO Measure the 19.2MHz CLK coming from the TCXO. Is it OK? NO Check/ reflow/ change VREG_TCXO, Y702, R703, C704, C724, R714, C712, C722, R704, R413, and C403 YES Reflow or change MSM6000 Measure RESIN_N. Is it high (2.8V)? NO Reflow or change PM6610 YES Change MSM6000

28. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Jammed Terminal 1.) Measure BB regulator voltage levels: VREG_MSMC – 2.75V, VREG_MSMP – 2.95V, VREG_MSMA – 2.6V, VREG_TCXO – 2.85V VPH_PWR, it should be 3.3V ~ 4.2V BSI Line @ J700 BSI Line @ C714 BSI Line @ R709 3.) Measure 19.2MHz System Clock output 2.) Measure 32kHz Sleep Clock output 4.) Measure RESIN_N. Is it high (2.8V)

29. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Charging Circuitry The PM6610 IC charge control is dependent on the charger type and the battery size. The charger’s DC input is through the dc- jack connector. This phone supports AC- 3/AC-4 & DC-4 chargers.

30. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Charging Circuitry Connecting a charger, it creates a voltage on the VCHG input of the PM6610. Charging starts when the PM6610 detects the VCHG input voltage level above 3.3V. The algorithm basically consists of the following three steps: Check that the system current (the collector current of PNP transistor) is within safety limits (<0.6A). Check the power consumption of PNP transistor is within safety limits (<1W). Check that the charger is within the charger window (voltage and current). If the charger is accepted and identified, the appropriate charging algorithm is initiated.

31. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Battery Circuit The 1255 uses a Lithium-Ion cell battery. MSM6000 reads the resistor inside the battery pack on the BSI line to identify the battery size. Different charging algorithm will be used for different battery sizes. The resistors is connected to the BSI pin inside the battery connector.

32. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Charger Faults Charger Faults Connect the charger and make sure the battery is connected. Check the “BSI” line. Is it about 75k Ohm or 81k Ohm? NO Check/ change DC jack, C714, C709 and VREG_TCXO. YES Measure voltage at D1006. Is it >4.5V? NO Check/ change DC jack, L101, D1006, C1030, R700, C717 and Q700. YES Read MOBILE TERMINAL_THERM value. Is it room temperature? NO Check NTC R606 and R605. Are they OK? NO Replace NTC or R605 YES Measure voltage between pin#1 and pin#3 of Q700. Is it >0.7V NO Reflow or change MSM6000 YES Change Q700 Check R708. Is it OK? NO Reflow/ change R708 YES Reflow or change PM 6610

33. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Charger Faults 1.) Check the “BSI” line of battery. Is it about 75K Ohm or 81k Ohm to GND? 2.) Measure voltage at D1006. Is it > 4.5V VREG_TCXO, it should be 2.85V Check NTC (R606) and R605 Are they OK? 3.) Read PHONE_THERM value. Is it about the room temperature? 1 3 4.) Measure voltage between pin#1 and pin#3 of Q700. Is it > 0.7V

34. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential The audio control and processing is provided by the MSM which contains the audio codec, the MCU and DSP block. These blocks handle and process the audio data signals. The baseband supports two microphone inputs and three receiver/ speaker outputs. The two microphone inputs: MIC1+ & MIC1- : input of 1255 schematic are used for the mobile terminal’s internal microphone. JACK_MIC+ & JACK_MIC- : input are used for headsets. Every microphone input can have either a differential or single-ended AC connection to MSM circuit: The internal microphone (MIC1+) and external headset microphone (JACK_MIC) are both differential signal which come from different sources and are connected to separate inputs at the MSM. The MICBIAS output is used for MIC1 to provide 1 mA of current at 1.8 Volts DC. VDD_MSMP (2.85V) regulated voltage from PMIC is used for JACK_MIC (external headset). Audio Control

35. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Audio Faults Retest Audio Faults 1 Is the onboard receiver working? Replace the receiver. Is it working now? Use CCS Software  Testing  Stereo Audio/Vibra  Receiver  Mobile terminal Receiver Loop Back Test command Is the signal coming out of the MSM6000 on EAR10+ and EAR10- ? Change the receiver. NO Check/ change C506, C507, c508. If OK, change the MSM6000. Audio Faults Page 2 YES NO

36. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Is Audio signal present at EAR10+ & EAR10-? If ok, replace the earpiece. If not ok, check c506,c507,c508,d501,d502 component. C508 C506 C507 Audio Faults D501 D502 EAR10+ EAR10-

37. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Audio Faults 2 Audio Faults 2 Is onboard microphone working? Replace the microphone. Is it working now? Retest Audio Faults Page 3 Measure MICBIAS voltage from MIC1+ pads. Is it 1.6V~ 1.95V? Check/ change R500,C528. If OK, change MSM6000. Check/ change C509, C510, R501 If OK, change MSM6000. Is the signal going to the MSM6000 at MIC1+ and MIC1- at C503? NO YES NO YES NO YES NO YES Retest Use CCS Software  Testing  Stereo Audio/Vibra  Microphone  Mobile terminal Microphone Test command

38. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential 1.) Does MICN @ MICP read ~1.95v? If not, check: R500, R501. If ok, go to step 2. 2.) Is signal going to UPP @ MICP and MICN @GM500 If not, check connections at: R500, R509,R510,R501, C503, C509, C510, and C528,D504,D503. If ok, change Microphone. Audio Faults 2 MICN MICP

39. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Audio Faults 3 Audio Faults 3 Check/ change R1029,R1030,R1031,R10 32.,R501 If OK, change MSM6000. Audio Faults Page 4 Select a ring tone and measure signals at L1003 and L1004. Are the signals OK? Change IHF Measure FF_SPKR_EN. Is it OK (2.9V)? And U1001 Vcc = VPH_PWR Change MSM 6000 and PM6610 Use CCS Software  Testing  Stereo Audio/Vibra  Speaker  Mobile terminal Speaker control Test command Is the internal handsfree speaker (IHF) working? NO YES NO YES NO YES

40. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential L1003 L1004 1.) Check L1003 & L1004. If not ok, go to step 2. If ok, change IHF. 3. )Use Software  Testing  Stereo Audio/Vibra  Speaker  Mobile terminal Speaker control Test command If not, check or change R1029,R1030,R1031,R1032,R501. If OK, change MSM6000. Audio Faults 3 R1029 R1030 R1031 R1032 R501 2.) Measure 2.9V @ FF_SPKR_EN and U1001=VPH_PWR. If ok, go to step 3. If not ok, change MSM6000 and PM6610. U1001 FF_SPKR_EN

41. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Audio Faults 4 Audio Faults 4 Is the vibrator working? Measure VBATT voltage pin 1 on the vibrator. Is it OK? Check VPH_PWR line. Is it OK? Reflow/ change battery, CR700, C726 END Use CCS Software  Testing  Stereo Audio/Vibra  Vibrator Control Test Command  vibrator should work. Measure the PM 6610 signal on pin 2 on the vibrator. Is the signal OK? Change the vibrator Change the PM 6610, CR700, C726 NO YES NO YES NO YES

42. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential 1.) Measure PM6610 signal at Vibra Pin 2. If not ok, replace PM6610. 3.) Measure VPH_PWR voltage at Vibrator(Vibra). If not ok, check VPH_PWR line. If ok, change PM6610. If not, repair. 2.) Via the User’s menu, test a vibrator to determine Vibra functionality. 4.) Replace Vibra. Audio Faults 4

43. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Display Faults Measure battery voltage at DNI700 pin1. Is it okay? Check/ change battery and VPH_PWR line Measure the voltage at Q1_pin2. Is it change to low? Measure the driver signal at Q1_pin1. Is the signal okay? Replace Q1 Check R206, R207. Does the voltage across resistor is okay? Check LEDs DS200 and DS201. Are they okay? Check resistor soldering / Replace R206, R207 Reflow/ change any bad component DS200, DS201 Retest Do the keyboard LEDs turned on when the mobile terminal is turned on or when making a call? Display Faults 2 Display Faults Reflow/ change MSM6000 NO YES NO YES NO YES NO YES NO YES NO YES

44. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Q1 R207 DS200 C2404 4.) Check LEDs DS200 and DS201 If ok, retest again If not ok, reflow/change DS200, DS201. 2.) Measure driver signal @ Q1 If ok, go to step 3. If not, reflow/change MSM6000. DNI700 1.) Measure battery voltage @ DNI700. If ok, go to step 2. If not, check/change battery and VPH_PWR line. 3.) Check the voltage @ R206,R207. If ok, go to step 4. If not ok, soldering/change R206, R207 DS201 R206

45. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Display Faults 2 Check LCD supply voltage at J401 pin9. Is it okay? Change PM6610 Check LCD signals: LCD_SER_CLK(J401_pin4), LCD_SER_DATA(J401_pin5), LCD_SER_A0(J401_pin6), LCD_SER_CS_N(J401_pin7). Are the signals okay? Change LCD module Does the display start? Display Faults Page2 Check/ change MSM6000 END NO YES NO YES NO YES

46. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential LED Driver The mobile terminal uses light-emitting diodes (LEDs) for liquid crystal display (LCD) and keypad illumination. There is two white LEDs for the LCD and six LEDs for the keypad. BACKLIGHT is the signal used to drive the LED driver for the LCD and keyboard.

47. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Signals and levels: LCD bus : LCD_SER_CLK, LCD_SER_DATA, LCD_SER_A0, LCD_SER_CS_N VREG_MSMP : 2.95v for LCD digital logic RSOUT_N : for LCD reset LCD Interface The mobile terminal uses a monochromatic LCD. The interface uses a serial bus to transfer the Command/ Data between MSM and LCD. The panel for 1255 is a 96x65 dot matrix FSTN LCD module. It has a FSTN panel composed of 96 segments and 65 commons. The LCD interface uses 4- lines for controlled Command/ Data with 9-bit data.

48. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Keypad Faults 1 NO YES Keypad Faults Is the power key working? Measure voltage at Sw9 PIN2 (2.8V). Is it high? Change the PM6610 Measure voltage at SW9 when power key is pressed. Is it Low? Retest Keypad Faults Page 2 Change the PM6610 NO YES NO YES

49. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential 2.) Is UEM Pin8 Voltage Low when Power key depressed? If ok, see Mobile Terminal is Dead troubleshooting. If not ok, check SW9 line. Keypad Faults 1 1.) Is UEM Pin8 Voltage high? If ok, go to step 2. If not, check: UEM VDD Voltage If ok, replace UEM. If not, check VPH_PWR Voltage.

50. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Keypad Faults 2 NO Keypad Faults Page 2 Are the UI module keys working? NO Change keypad module. Is it working? YES Retest YES Measure KEYSENSE(1~4)_N signals between MSM6000 and keypad at every outer dome key. Are they ~2.9V? NO Make sure there are no shorts on KEYSENSE(1~4)_N. If OK, change MSM6000. Otherwise, remove the short. YES END Measure KYPD_(9,11,15,13) signals between MSM6000 and keypad on every inner dome Key. Are they about 0V? NO Make sure there are no shorts on KYPD_(9,11,15,13). If OK, change MSM6000. Otherwise, remove the short. YES Change the MSM6000

51. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential 1.) Measure signals KEYSENSE(1~4)_N between the UPP any keypad @ every dome key. Do they read ~2.9V? If not, make sure there are no shorts. If ok, replace UPP. 2.) Measure signals KYPD_(9,11,13,15)between the UPP and keypad @ every dome key. Do they read ~0V? If not, make sure there are no shorts. If ok, replace UPP. Keypad Faults 2

52. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential The 1255 supports following accessories. Pop-port bottom connector pin out. The pin out on the 1255 connector is as follows: DC Charger Input  Blue Headset Jack Input  Green Mic Input  Purple You can perform the following in 1255 accessories: Charging Audio interface headset mic and receiver Accessory Detection

53. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Headset Detection The phone support Nokia standard 2.5mm mono headset. The headset insertion to the phone is detected through pin 3 (HS_DET) of the headset Jack, J1001. HS_DET (“JACK_SENSE” pin in 1255 schematic) is low when headset not inserted. It becomes high when headset is inserted. Headset Detection Circuit

54. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential The 1255 Series phone supports UIM. Use the waveform in the Figure to verify that: UIM_DATA, UIM_CLK, UIM_REST, and VREG_RUIM signals are activated in the correct sequence at power up. This image may be observed when the UIM is installed on the phone and functioning normally. SIM Interface/Signals

55. © Nokia 1255_Baseband_Training / Jan 2006 / CFSCompany Confidential Questions??? Thank You for your attention!