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Nokia 2255 Baseband Description And Troubleshooting
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Nokia 2255 Baseband Description And Troubleshooting

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Nokia Customer Care
2255 (RM-97)
Mobile Terminal
Baseband Description and
Troubleshooting
©2005 Nokia Corporation
ISSUE 1 10/2005
Company Confidential

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Summary of Contents for Nokia 2255

  • Page 1 Nokia Customer Care 2255 (RM-97) Mobile Terminal Baseband Description and Troubleshooting ©2005 Nokia Corporation ISSUE 1 10/2005 Company Confidential...

  • Page 2: Table Of Contents

    2255 (RM-97) Baseband Description and Troubleshooting Contents Introduction ..............................5 Power Up Sequence ............................ 6 Flash Programming ............................8 Flashing Tool ..............................8 Flashing Troubleshooting what about this section? Is it needed? ..........10 Flashing Phoenix Interface........................12 Audio ................................13 How the Audio Works ..........................13...
  • Page 3 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting No LCD Display ............................42 Phoenix Tools ..............................43 Reference ............................... 49 Signal references ............................49 Main PWB Overview ..........................50 Test point map - bottom ........................50 Test point map - top ..........................51 ©2005 Nokia Corporation...
  • Page 4 2255 (RM-97) Baseband Description and Troubleshooting This page intentionally left blank. ©2005 Nokia Corporation Page 4 Company Confidential ISSUE 1 10/2005...

  • Page 5: Introduction

    Nokia Customer Care Baseband Description and Troubleshooting Introduction The 2255 baseband module is a single-band Code Division Multiple Access (CDMA) engine and is based on the DCT4.0 standard. The baseband engine includes two major Application Specific Integrated Circuits (ASICs): • Universal Energy Management Cost (UEMC) •...

  • Page 6: Power Up Sequence

    2255 (RM-97) Baseband Description and Troubleshooting Power Up Sequence When the mobile terminal is dead or jammed always check the Power Up Sequence of the baseband area. Verify all regulator and reset signals are correct to ensure proper power up of UEMC and UPP (see...
  • Page 7 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Figure 2: Measured power-on sequence and timing Flash Programming Troubleshoot the power up sequence by performing the following checks: • Check that Vbat gets to the mobile terminal and to UEMC •...

  • Page 8: Flash Programming

    2255 (RM-97) Baseband Description and Troubleshooting Vbat VFLASH1 VCORE 19.2MHz PURX UEMRSTX Figure 3: Power up test points Flash Programming Flashing Tool Flash programming is done through the VPP, FBUSTX, FBUSRX, MBUS, and BSI signals. When mobile terminal has entered flash programming mode, prommer will indicate to UEMC that flash programming will take place by writing 8-bit password to UEMC.
  • Page 9 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting prommer and MCU FBUSRX = Data to UPP FBUSTX = Data to prommer VPP = 0v/ 1.8v/ 12v (read only/normal op. or slow programming/fast programming) Figure 4 shows the DA-55 docking station adapter and Module Jig MJ-72.
  • Page 10 2255 (RM-97) Baseband Description and Troubleshooting Figure 6 shows the mobile terminal connected to the DA-55 flash adapter. MBUS FBUSRXO FBUSTXO Figure 6: Flashing test points ©2005 Nokia Corporation Page 10 Company Confidential ISSUE 1 10/2005...

  • Page 11: Flashing Phoenix Interface

    2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Flashing Phoenix Interface Run EZ Flash in Phoenix to flash the mobile terminal. Figure 7: EZ Flash in Phoenix Figure 8: EZ Flash in Phoenix ©2005 Nokia Corporation ISSUE 1 10/2005...

  • Page 12: Audio

    • MIC3 input is used for the FM Radio Every microphone input can have either a differential or single-ended AC connection to the UEMC circuit. In the Nokia 2255, the internal microphone (MIC1) and external microphone (MIC2) for UHJ is single-ended. However, the Universal Headset interface is single-ended.

  • Page 13: Audio Troubleshooting

    2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Audio Troubleshooting When troubleshooting the audio, make these common checks (see Figure 10): • Perform visual inspection of all the ASIPs and the UEMC. • Inject 1KHz signal into MiC1 and trace it to the earpiece. Only when using IHF signal will it be amplified by a factor of 5x.

  • Page 14: Audio Phoenix Interface

    2255 (RM-97) Baseband Description and Troubleshooting Audio Phoenix Interface Run Audio Test in Phoenix to check the audio functionality. MiC1- Use the first option to route the audio from the internal microphone to the headset speaker. MiC2- Use the second option to route the audio signal from the headset microphone to internal earpiece.

  • Page 15: Fm Radio

    2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting FM Radio How the FM Radio Works The UPP turns on the FM radio and sets the frequency using the CBUS serial interface as the communication channel. A high frequency FM radio signal comes in through RFIN1 Pin to the FM radio chip and gets demodulated into a low frequency signal and is sent to the UEMC for amplification.

  • Page 16: Fm Radio Phoenix Interface

    2255 (RM-97) Baseband Description and Troubleshooting • If the audio signal is correct (with 800mv DC-offset), then check the UEMC for shorts, voids, and misalignments • If the UEMC and FM Radio Chip are correct, check the UHJ and headset VANA (2.8V)
  • Page 17 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Power On check box Frequency control Mute, On/Off control Mono/Stereo control Headset/IHF control Volume control Figure 14: Phoenix FM Radio Control panel ©2005 Nokia Corporation ISSUE 1 10/2005 Company Confidential Page 17...

  • Page 18: Display

    2255 (RM-97) Baseband Description and Troubleshooting Display How the Display Works Nokia 2255 has a color display (128 x 128 64K color depth), controlled by the UPP through a parallel interface. Display: 64K color (128x128) UHJ Headset jack/ cover 4-way navigation...
  • Page 19 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Main display connector LCD_ DA LCD_RESET V Flash 1 LCD_CSX Figure 16: Display Chips and Frequency ©2005 Nokia Corporation ISSUE 1 10/2005 Company Confidential Page 19...
  • Page 20 2255 (RM-97) Baseband Description and Troubleshooting Display Phoenix Interface Run the Display Test and Display Tune in Phoenix to check the display. Figure 17: Phoenix Display Test option ©2005 Nokia Corporation Page 20 Company Confidential ISSUE 1 10/2005...
  • Page 21 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Display and Keypad Backlight Schematic LED driver LED driver output (~9.5 V) GenIO(19) Display LEDs Flashlight LEDs Dlight Keypad LEDs Klight GenIO(18) CallLEDs Figure 18: Display and keypad backlight schematic ©2005 Nokia Corporation...

  • Page 22: Display Backlight Troubleshooting

    2255 (RM-97) Baseband Description and Troubleshooting The 2255 display, keypad, flashlight, and CallLED light are power by a single LED driver and controlled by both UEMC and UPP. GENIO(19) coming out of UPP turns on the LED driver. Then the Dlight comes up, activating the current mirror and turning on the display and keypad backlight.
  • Page 23 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Rset for display Vout (~12V) VIN (Vbat) ~9.5 V (33 Ohms) ~8.8 V ~8 V VLED+ Output setting resistors VLED+ Current mirror transistors Rset for display LED (33 Ohms) VIN (Vbat) Dlight Vout (~9.5V)

  • Page 24: Keypad Backlight

    2255 (RM-97) Baseband Description and Troubleshooting Keypad Backlight Keypad Backlight Troubleshooting When troubleshooting keypad backlight, make these common checks (see Figure 20 Figure 21): • Perform visual inspection of all the components including LEDs • If Keypad LEDs do not turn on check Vout +(~9.5V). If ok then you can assume the driver is working properly and the LED’s or the current mirror circuitry is...
  • Page 25 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Current Mirror Rset for display VIN (Vbat) Vout (9.5 V) Transistors LEDs (56 Ohms) ~9.5 V ~8.8 V ~8 V Keypad LEDs Current mirror transistors VIN (Vbat) Rset for display LEDS (56 Ohms) Vout (~9.5V)
  • Page 26 2255 (RM-97) Baseband Description and Troubleshooting Backlight Display Phoenix Interface Run the Display Test in Phoenix to check the keypad backlight. Turn on Dlight Turn on Klight Figure 21: Phoenix Display Test option ©2005 Nokia Corporation Page 26 Company Confidential...

  • Page 27: Uim Card

    How the UIM Card Works The Nokia 2255 supports two types of UIM cards that work at 1.8V and 3.0V. When the mobile terminal is switched on with a UIM card, the UPP sends a 1.8V signal to the UIM card and waits for the UIM card’s response and identification.
  • Page 28 2255 (RM-97) Baseband Description and Troubleshooting Figure 23: Vsim check • Check detection sequence SIM_CLK SIMRSTX VSIM SIM_IOX Figure 24: Detection sequence ©2005 Nokia Corporation Page 28 Company Confidential ISSUE 1 10/2005...
  • Page 29 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting • Verify communication signals Figure 25: Communication signals • If no signals are present: (1) check contacts on Sim connector are correct, (2) check ESD chips are correct, and (3) check the UEMC is correct. Replace damaged parts if necessary.

  • Page 30: Uim Card Phoenix Interface

    2255 (RM-97) Baseband Description and Troubleshooting UIM Card Phoenix Interface Run the SIM-Lock Status in Phoenix to test a SIM (or UIM) card. Figure 27: Phoenix SIM Testing options ©2005 Nokia Corporation Page 30 Company Confidential ISSUE 1 10/2005...

  • Page 31: Battery (Lynx) Interface Circuit

    2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Battery Interface Circuit Figure 28 illustrates the battery interface circuit. The BSI voltage level for different power-up modes: • normal mode - 1.23V • for the test mode - 170MV • local mode - 90MV...

  • Page 32: Charging

    2255 (RM-97) Baseband Description and Troubleshooting Charging When troubleshooting battery charging, make these common checks (see Figure Figure 30 Figure 31): • Does the battery bar scroll? Battery level indicator Figure 29: Battery indicator bar • Measure voltage at V2000. Is it >3VDC?

  • Page 33: Common Problems

    2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Common Problems The following section has a list of common problems, along with some standard checks. No Communication During Flash • Make sure there is a good connection between flash adaptor and the mobile terminal •...

  • Page 34: No Audio

    2255 (RM-97) Baseband Description and Troubleshooting • Check for incorrect SleepX signal levels • Check if ESN number is corrupted No Audio • Check for bad contacts or damaged ear piece • Check for bad connections at mic • Check for broken or bad solder joint of passive components •...

  • Page 35: Phoenix Tools

    2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Phoenix Tools Baseband menu items in Phoenix Guide. Figure 32: CDMA menu in Phoenix Figure 33: Baseband Troubleshooting menu in Phoenix Figure 34: Flashing menu in Phoenix ©2005 Nokia Corporation ISSUE 1 10/2005...
  • Page 36 2255 (RM-97) Baseband Description and Troubleshooting Figure 35: Troubleshooting Factory menu in Phoenix Figure 36: ADC menu in Phoenix ©2005 Nokia Corporation Page 36 Company Confidential ISSUE 1 10/2005...
  • Page 37 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Figure 37: EM Calibration menu in Phoenix Figure 38: General IO and GPIO menu in Phoenix ©2005 Nokia Corporation ISSUE 1 10/2005 Company Confidential Page 37...
  • Page 38 2255 (RM-97) Baseband Description and Troubleshooting Figure 39: Keyboard Test menu in Phoenix ©2005 Nokia Corporation Page 38 Company Confidential ISSUE 1 10/2005...
  • Page 39 2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Figure 40: Phone Information menu in Phoenix Figure 41: Phone Control menu in Phoenix ©2005 Nokia Corporation ISSUE 1 10/2005 Company Confidential Page 39...
  • Page 40 2255 (RM-97) Baseband Description and Troubleshooting Figure 42: Regulator Control menu in Phoenix Figure 43: Self-test menu in Phoenix ©2005 Nokia Corporation Page 40 Company Confidential ISSUE 1 10/2005...

  • Page 41: Reference

    2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Reference Signal references RFconv Clock 19.2 MHz System Clock 19.2 MHz D BOS Interface C BOS Interface Digital Sleep Clock 32 KHz Analog Sleep Clock 32 KHz Figure 44: Signal References ©2005 Nokia Corporation...

  • Page 42: Main Pwb Overview

    2255 (RM-97) Baseband Description and Troubleshooting Nokia Customer Care Main PWB Overview Test point map - bottom Figure 45: test points - bottom ©2005 Nokia Corporation Page 42 Company Confidential ISSUE 1 10/2005...

  • Page 43: Test Point Map - Top

    2255 (RM-97) Nokia Customer Care Baseband Description and Troubleshooting Test point map - top Figure 46: test points - top ©2005 Nokia Corporation ISSUE 1 10/2005 Company Confidential Page 43...
  • Page 44 2255 (RM-97) Baseband Description and Troubleshooting Nokia Customer Care This page intentionally left blank. ©2005 Nokia Corporation Page 44 Company Confidential ISSUE 1 10/2005...

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Rm-97

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