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Nokia 6255 Description And Troubleshooting
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Nokia 6255 Description And Troubleshooting

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Nokia Customer Care
6255/6255i6256/6256i (RM-19)
Mobile Terminal
Baseband Description and
Troubleshooting
©2005 Nokia Corporation
Issue 2 05/2005
Company Confidential

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Summary of Contents for Nokia 6255

  • Page 1 Nokia Customer Care 6255/6255i6256/6256i (RM-19) Mobile Terminal Baseband Description and Troubleshooting ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential...

  • Page 2: Table Of Contents

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Contents Page Introduction ..............................4 Power Up and Reset ............................ 6 Power Up - Power Key..........................8 Power Up - Charger Connection ......................8 Power Up - RTC Alarm..........................9 Power Off ............................... 9 Power Consumption and Operation Modes ..................
  • Page 3 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Secondary Display Test Points........................45 GPS Module ..............................48 Troubleshooting............................49 Mobile Terminal is Totally Dead ......................50 Flash Programming Does Not Work .....................51 Power Does Not Stay on or the Mobile Terminal is Jammed ............53 Charger Faults ............................55...
  • Page 4 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care This page intentionally left blank. ©2005 Nokia Corporation Page 4 Company Confidential Issue 2 05/2005...

  • Page 5: Introduction

    Nokia Customer Care Baseband Description and Troubleshooting Introduction The 6255/6255i/6256/6256i baseband module is a tri-mode, Code Division Multiple Access (CDMA), dual-band engine and is based on the DCT4.5 standard. The baseband engine includes two major Application Specific Integrated Circuits (ASICs): •...
  • Page 6 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Production Regulator Test IF Battery Zocus 32 KHz UEME IHF Speaker Amplifier UHS Jack Regulation DC Jack Charge Control EarPiece Audio Tomahawk Vibra FBUS / MBUS SIM I/F Disp BL’s Cam Flash...

  • Page 7: Power Up And Reset

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Power Up and Reset The UEME ASIC controls the power up and resets. The baseband can be powered up in the following ways: • Pressing the Power button, which means grounding the PWRONX pin of the UEME •...
  • Page 8 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Reference signal PwrOnX Charger Detection Reset mode is entered and UEMRSTX VCORE the watchdog starts End of settling time (only if Vbat > Vcoff+_); VFlash1 VFLASH1 regulator enabled VANA VR3, VANA, VIO, and VCORE enabled;...

  • Page 9: Power Up - Power Key

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Figure 3: Measured power-on sequence and timing Power Up - Power Key When the power key is pressed, the UEME enters the power-up sequence. Pressing the power key grounds the PWRONX pin on the UEME. The UEME PWRONX signal is not part of the keypad matrix.

  • Page 10: Power Up - Rtc Alarm

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care 100mA of constant output current from the connected charger’s output voltage. The battery’s voltage rises at it charges, and when the VBAT voltage level is detected to be higher than master reset threshold limit (V ), the start-up charge is terminated.

  • Page 11: Sleep Mode

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Sleep Mode When the SLEEPX signal is detected low by the UEME, the mobile terminal enters sleep mode. In sleep mode, both processors (MCU and DSP) are in stand-by mode. The mobile terminal enters sleep mode only when both processors make this request.

  • Page 12: Power Distribution

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care The charging control circuitry (CHACON) inside the UEME controls the charging current delivered from the charger to the battery. The battery voltage rise is limited by turning the UEME switch off when the battery voltage has reached 4.2V. The charging current is monitored by measuring the voltage drop across a 220mOhm resistor.
  • Page 13 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Table 3 includes the UEME RF regulators. Table 3: RF Regulators Maximum Regulator Vout (V) Notes Current (mA) VR1A 4.75 Enabled when cell receiver is on VR1B 4.75 Enabled when the transmitter is on 2.78...

  • Page 14: Clock Distribution

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Clock Distribution RFClk (19.2MHz Analog) The main clock signal for the baseband is generated from the voltage-controlled temperature-controlled crystal oscillator (VCTCXO). This 19.2MHz clock signal is generated by the radio frequency circuitry and fed to the radio frequency clock (RFCLK) pin of the D2800 processor.

  • Page 15: Rfconvclk (19.2Mhz Digital)

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting RFConvClk (19.2MHz Digital) The D2800 processor distributes the 19.2MHz clock to the internal processors (the DSP and MCU) where the software multiplies this clock by seven (=134.4MHz) for the DSP and by two (=38.4MHz) for the MCU.

  • Page 16: Cbusclk Interface

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care CBUSClk Interface CBUS utilizes a 1.2MHz clock signal, which is used by the MCU to transfer data between the UEME and the D2800 processor. Figure 6: CBUS data transfer ©2005 Nokia Corporation...

  • Page 17: Dbus Clk Interface

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting DBUS Clk Interface DBUS utilizes a 9.6MHz clock signal, which is used by the DSP to transfer data between the UEME and the D2800 processor. Figure 7: DBUS data transfer ©2005 Nokia Corporation...

  • Page 18: Sleepclk (Digital)

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care SleepCLK (Digital) The UEME provides a 32kHz sleep clock for internal use and also to the D2800 processor, where it is used for the sleep-mode timing. Figure 8: 32 kHz Digital output from UEME ©2005 Nokia Corporation...

  • Page 19: Sleepclk (Analog)

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting SleepCLK (Analog) When the system enters sleep mode or power-off mode, the external 32KHz crystal provides a reference to the UEME. The RTC circuit also uses this clock to turn on the mobile terminal during power-off or sleep mode.

  • Page 20: Flash Programming Indication

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Flash Programming Indication After connecting the flash prommer to the mobile terminal, the flash prommer sets the MBUS line low to notify the MCU that the flash prommer is connected. This causes the UEME reset state machine to perform a reset to the system by setting the PURX signal low for 20ms.
  • Page 21 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting FLASH_1 CH1 = BSI CH2 = MBUS CH3 = FBUSTX CH4 = FBUSRX Measure points Production test pattern (J396) Figure 10: Flashing starts by BSI being pulled up and password being sent to UEME This boot code asks the MCU to report the mobile terminal’s configuration information...
  • Page 22 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care FLASH_2 CH1 = PURX CH2 = MBUS CH3 = FBUSTX CH4 = FBUSRX M easure points Production test pattern (J396) Figure 11: Flashing, continued • Ch1= PURX • Ch2 = MBUS toggled three times for MCU initialization •...

  • Page 23: Flash Programming Error Codes

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting FLASH_3 CH1 = PURX CH2 = MBUS CH3 = FBUSTX CH4 = FBUSRX M easure points Production test pattern (J396) Data transfer has started (Fbus_Rx) Figure 12: Flashing, continued 2 Flash Programming Error Codes The following characteristics apply to the information in Table 4.
  • Page 24 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Table 4: Flash Programming Error Codes (Continued) Error Description Not Working Properly C103 " Boot serial line fail." Mbus from Prommer->UEME- >UPP(MbusRx)(SA1) FbusRx from Prommer->UEME->UPP FbusTx from UPP->UEME->Prommer C104 "MCU ID message sending failed in the Phone."...

  • Page 25: Charging Operation

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Charging Operation Battery The mobile terminal uses a Lithium-Ion cell battery (BL-6C) with a capacity of 1070mAh. Reading a resistor inside the battery pack on the BSI line indicates the battery size. An NTC resistor close to the SIM connector measures the mobile terminal’s temperature on...

  • Page 26: Charger Detection

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Charger Detection Connecting a charger creates voltage on the VCHAR input of the UEME. Charging starts when the UEME detects the VCHAR input voltage level above 2 V (VCH threshold). det+ The VCHARDET signal is generated to indicate the presence of the charger for the SW.

  • Page 27: Main Display

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Main Display There are three LEDs for the main display, which utilize the KLIGHT signal. Table 5 shows the characteristics of the main display. Table 5: Main Display Characteristics Parameter Value...

  • Page 28: Secondary Display

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Secondary Display There are three LEDs for the secondary display, which utilize the DLIGHT signal. Table 5 shows the characteristics of the secondary display. Table 6: Secondary Display Characteristics Parameter Value...

  • Page 29: Dc Measurements

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting DC Measurements Table 7: Power Supply Characteristics Measured Signal Name Typical Unit Description Value (V) Control line VANA (Vflash2) 2.79 2.78 Analogue supply VDIG 1.79 Digital supply System GND Table 8: DC Characteristics...

  • Page 30: Fm Radio

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care FM Radio FM radio circuitry is implemented using highly integrated radio IC, TEA5767HN. FM radio circuitry is controlled through the serial bus (GenIOs) interface from MCU SW. Figure 18: FM Radio (N356), Audio (N150), antenna, and digital interface connections Stereo audio output signals are fed to the stereo amplifier.
  • Page 31 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Figure 19: FM Radio signals before Radio on • Ch1 : FMClk(32.768KHz) • Ch2 : FMWrEn • Ch3 : FMctrlClk • Ch4 : FMctrlDA ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential...

  • Page 32: Usb Interface

    D2800 processor IC. The core completes several USB functions automatically and is controlled by the ARM9 MCU. Because the D2800 processor's IO cells are restricted to 1.8V, the Nokia USB Transceiver (NUT) is used as a data-level, shifting and conditioning ASIC. NUT provides the interface between the ASIC's 1.8V bus and the 3.3V USB bus.
  • Page 33 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting TIKUEdge UEME VAUX3 ARM MCU Vreg Genio # NUT_ Fbus SEmode Genio # NUT_speed _Speed USB ASIP System W2FC Connector PVCI Bus, Genio # Vbus IRQs, 3.3V PUENO DMA control Pull_up_en...
  • Page 34 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care The USB consists of four signals: Table 10: USB Signals Signal Description Vbus 5V Power supply from host to device Differential data signal (swings between 0 and +3.3V) Differential data signal (swings between 0 and +3.3V)

  • Page 35: Accessories

    Nokia Customer Care Baseband Description and Troubleshooting Accessories The 6255/6255i/6256/6256i supports Pop-port and Universal Headset accessories, differential and single-ended, respectively. Detection of the Pop-port accessories is done through the ACI signal where the Universal Headset is detected on TIKU_GenIO (4).
  • Page 36 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Charging Charging through Pop-port is accomplished in the same manner as through the charger connector. Pin 1 of the Pop-port is physically connected to the charger connector. When the mobile terminal is connected to a desktop charger (e.g., DCV-15), it charges in the same manner as it does with the charger connector.

  • Page 37: Pop-Port Headset Detection

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Pop-port Headset Detection Accessory detection on the Pop-port is done digitally. The pins used for this accessory detection are: • Pin 2 (Charge GND) • Pin 3 (ACI) • Pin 4 (Vout)

  • Page 38: Accessory Detection Through Aci

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Figure 25: Waveform showing Pop-port FBus communication Accessory Detection Through ACI USB and Audio on (mono or stereo)/FM radio communication in Pop-port is done through the following signals: Table 12: Accessory Detection Signals...
  • Page 39 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Figure 26: Waveform showing accessory detection through ACI ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential Page 39...

  • Page 40: Ruim (Sim Car)

    Nokia Customer Care RUIM (SIM CAR) The 6255/6255i/6256/6256i supports SIM CAR. Use the waveform in Figure 27 to verify that the sim_vcc, sim_i/o, cim_clk, and sim_rst signals are activated in the correct sequence at power up. This picture may be taken when the SIM CAR is installed on the mobile terminal to measure the signals when the mobile terminal is turned on.

  • Page 41: Main Display Test Points

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Main Display Test Points SLEEP_CLK CBUS_EN CBUS_DA MICB1 VBAT CBUS_CLK MICB2 RFBUS_CLK PURX Figure 28: Main display test points - top ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential Page 41...
  • Page 42 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Vibra SIMDAO SIMCLKO SIMRST SLEEPX VSIM VFLASH1 MMC card Figure 29: Main display test points - bottom - 1 ©2005 Nokia Corporation Page 42 Company Confidential Issue 2 05/2005...
  • Page 43 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting 19.2MHz Clk VSIM FBUSTXO MBUS FBUSRXO VANA VR1A VR1B MMC_VCC MMC_CLKL VCORE_LIN MMC_DATA Figure 30: Main display test points - bottom - 2 ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential...
  • Page 44 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care POWERON_X Flex connector LCDCAM_CLK Figure 31: Main display test points - bottom - 3 ©2005 Nokia Corporation Page 44 Company Confidential Issue 2 05/2005...

  • Page 45: Secondary Display Test Points

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Secondary Display Test Points GPS_U2TX GPS_U2RX V LED + Earpiece_1 Earpiece_2 Secondary display Secondary display driver enable Figure 32: Secondary display test points - top ©2005 Nokia Corporation Issue 2 05/2005...
  • Page 46 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care CAM_LED_EN 19.2HMz_GPS VLED GPS_UI_RX BT_VART_RX KLIGHT GPS_INT_UI_CLK GPS_UI_TX Camera flash strobe Camera key 1 GPS_EN_RST Camera key 2 CALLED2 VLED Camera_Clk Camera CE DLIGHT VLED Figure 33: Secondary display test points - bottom - 1 ©2005 Nokia Corporation...
  • Page 47 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting VFLASH_LIGHT VBAT Camera Camera flash driver LED driver Figure 34: Secondary display test points - bottom - 2 ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential Page 47...

  • Page 48: Gps Module

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care GPS Module The GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to determine longitude and latitude of the handset. The GPS circuitry is completely separate of the CE circuitry and is located almost exclusively on the secondary side of the PWB underneath the display module.

  • Page 49: Troubleshooting

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Troubleshooting The following hints allow you to find the cause of the problem when the circuitry seems to be faulty. Troubleshooting instructions are divided into the following sections: • Mobile terminal is totally dead •...

  • Page 50: Mobile Terminal Is Totally Dead

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Mobile Terminal is Totally Dead If current is zero, check X2002 to make sure Vbat makes contact. Mobile terminal is If current is too high, check for shorts. dead Make sure all BB regulators are at their respective voltage levels (VANA, VIO, VCORE, VFlash1, and VR3).

  • Page 51: Flash Programming Does Not Work

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Flash Programming Does Not Work Flash faults The mobile terminal does not set Measure BSI pulse during Check BSI line Flashbus TXD line Flash programming. Is it X2002, C2015, high after the...
  • Page 52 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Flash Faults Page 2 Can you read the Re-flow the flash. Is Re-flow the UPP. Is manufacturer ID and it OK? it OK? the device ID? Is the mobile Mobile terminal totally...

  • Page 53: Power Does Not Stay On Or The Mobile Terminal Is Jammed

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Power Does Not Stay on or the Mobile Terminal is Jammed Check VBATT, VIO, Mobile VCORE, VFlash1, terminal is Repair VANA, VR3 capacitors. jammed Are they OK? Measure VIO, Check BSI/BTEMP VCORE, VFlash1, lines and VBATT lines.
  • Page 54 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Mobile terminal is jammed, page 2 Mobile terminal Has the mobile Flash the mobile shutdown after 32 terminal been terminal seconds flashed? Measure DBusClk Measure watchdog (9.6 MHz), Data, and Reflow or change signal Cbus.

  • Page 55: Charger Faults

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Charger Faults Charger faults Connect Charger. Make sure battery is connected. Battery bar doesn't Retest work (scroll) Measure voltage Check X2001, F2000, over V2000. Is it >3.0 L2006, V2000, Vdc? C2012, and C2013.

  • Page 56: Audio Faults

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Audio Faults Earpiece A udio faults C hange Is the earpiece earpiece. Is it R etest w orking? w orking now ? Set phone in Local M ode. U se Phoenix Troubleshooting >...

  • Page 57: Microphone

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Microphone Audio faults, page 2 Is the Change the microphone microphone. Is it Retest working? working now? Set mobile terminal in Local Mode. Use Phoenix Troubleshooting > Phone Control > Aphone State Tab >...

  • Page 58: Ihf

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Audio faults, page 3 Check IHF audio amplifier Is IHF working? Replace N2100. (N2100). Is it Set the phone to Local Mode. Use Phoenix to open Troubleshooting > Phone Control > Phone State tab >...

  • Page 59: Vibra

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Vibra A udio faults, page 4 M easure VB A TT Is Vibra C heck VB A TT voltage pin 1 of w orking? line M 2400. Is it O K ? Y ES U se the U I M enu >...

  • Page 60: Display Faults

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Display Faults Main Display Main Display faults Are the UI module and display LEDs Measure KLIGHT at If Vbat is not OK, turned on when the R2455, Vbat at check the battery. If...
  • Page 61 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Main Display faults, page 2 Try changing Does the Display display module. Retest show an image? Is it OK? Measure VIO and VFLASH1. Is it Change UEM Check LCD signals LCDCSX, LCDCLK, LCDDA, and XRES.

  • Page 62: Secondary Display

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Secondary Display Secondary Display faults Are the secondary Check N2451. Is it Replace the N2451. display LEDs on? Check Vbat Check Vbat at connector and C2470. Is it OK? battery. Check V2450, V2451, and V2452.

  • Page 63: Keypad Faults

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Keypad Faults Power Key Keypad faults Measure voltage Check S300, Is the power key at pin 1 and 3 C314, and R304. working? (S300). Is it If OK, change high? Measure voltage...

  • Page 64: Ui Modules

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care UI Modules Keypad faults, page 2 Change keypads Are UI modules module. Is it Retest keys working? working? Measure ROW0-4 Keyb(5) and Keyb(9) signals Retest between UPP and Z2400. Are they ~1.8V?

  • Page 65: El Panel And Driver

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting EL Panel and Driver EL Panel and Driver Faults Check Is the keypad Tiku_GPIO(57). Is it Replace D2800 backlight on? Check N2400. Is it Replace N2400 Is the root EL power...

  • Page 66: Usb

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care Before proceeding with the USB faults troubleshooting portion of this guide, attach a DKU-2 cable between the mobile terminal and the PC. The PC must recognize that a USB device has been attached and load driver(s) for that device. The mobile terminal appears in the Device Manager dialog box.
  • Page 67 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting If no device is detected, proceed as follows: USB faults Check continuity between system Replace system connector pin 5 and connector R1053 Check continuity between system Replace system connector pin 6 and...
  • Page 68 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care USB faults page 2 Attach DKU-2 cable between PC and phone USB host not Check for ~5V on Check for ~5V on supplying VBUS, C1022 Z101 check connection to Replace R1190 Check for ~2.8V on...
  • Page 69 6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting USB faults page 3 Check for ~0V on pin Replace NUT and Check for ~0V on 7 of system check for ~0V on Replace D2800 J960 connector J960 Hardware Replace USB ASIP...

  • Page 70: Mmc

    6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care The hardware of the MMC interface from the UEME (D2200) to the MMC connector (X3200) cannot be tested without an MMC card. Solder wires on respective points to be able to measure the following.

  • Page 71: Fm Radio

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting FM Radio FM Radio faults Check solder on Power on the phone Is the FM radio N6100, X101, and and turn FM radio on working? replace N6100 if not by Phoenix working.
  • Page 72 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care (To Radio FM Radio Faults 1) faults 2 Measure VREF at Check C6106 C6106. Is it 1.6V? Measure VAFL/VAFR at C6180/C6182. Change FM Radio Does it have an chip (N6100) audio signal?

  • Page 73: Camera

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting Camera Camera faults Make sure soldering Power on the phone on D6600 and X6600 Check D2200 and and turn camera on is OK and check replace it when by Phoenix or UI...
  • Page 74 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care The error "SIM card rejected" means that the ATR message received from the SIM card is corrupted (e.g., data signal levels are wrong). The first data is always ATR, and it is sent from the card to the mobile terminal.

  • Page 75: Gps

    6255/6255i6256/6256i (RM-19) Nokia Customer Care Baseband Description and Troubleshooting GPS faults Troubleshoot CE Is VCORE at 1.5V? power supply Is VIO at 1.8V? GPS_RF_CLK Troubleshoot CE (19.2MHz) OK? VCTCXO circuit If the BB ASIC is being held in reset, GPS_EN_RESET held...
  • Page 76 6255/6255i6256/6256i (RM-19) Baseband Description and Troubleshooting Nokia Customer Care This page intentionally left blank. ©2005 Nokia Corporation Page 76 Company Confidential Issue 2 05/2005...

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