Nokia 6235 Baseband Description And Troubleshooting
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Nokia 6235 Baseband Description And Troubleshooting

Mobile terminals
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Nokia Customer Care
6235/6235i/6236i (RM-60)
Mobile Terminals
Baseband Description and
Troubleshooting
©2005 Nokia Corporation
Issue 1 04/2005
Company Confidential

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  • Page 1 Nokia Customer Care 6235/6235i/6236i (RM-60) Mobile Terminals Baseband Description and Troubleshooting ©2005 Nokia Corporation Issue 1 04/2005 Company Confidential...

  • Page 2: Table Of Contents

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Contents Page Introduction ..............................5 Power Up Sequence ............................7 Flash Programming ............................8 Flashing Tool ..............................8 Flashing Phoenix Interface ........................9 Audio .................................. 9 How the Audio Works ..........................9 Audio Troubleshooting ..........................10 Audio Phoenix Interface ..........................12...
  • Page 3 6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Bottom Board .............................41 Top Board ..............................42 Main Test Points ............................43 Current Test Points ............................43 Current too High at Zero Test ........................43 Terminal in Local Mode Test ........................44 Display Test ..............................45 Charging Test ..............................45...
  • Page 4 6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care This page intentionally left blank. ©2005 Nokia Corporation Page 4 Company Confidential Issue 1 04/2005...

  • Page 5: Introduction

    Nokia Customer Care Baseband Description and Troubleshooting Introduction The 6235/6235i/6236i 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 VCORE SMPS IRDA Figure 1: Baseband block diagram Even though the Bluetooth, External Display and MMC components are on the ASICs, they are not used in the 6235/6235i/6236i baseband module. ©2005 Nokia Corporation Page 6 Company Confidential Issue 1 04/2005...

  • Page 7: Power Up Sequence

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Power Up Sequence When phone 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...

  • Page 8: Flash Programming

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Figure 3: Power Up Sequence Flash Programming Flashing Tool Figure 4 shows the DA-54 flashing tool. Figure 4: DA-54 Flashing Tool ©2005 Nokia Corporation Page 8 Company Confidential Issue 1 04/2005...

  • Page 9: Flashing Phoenix Interface

    • MIC3 input is used for the Universal Headset. Every microphone input can have either a differential or single ended ac connection to UEMEK circuit. In the Nokia 6235/6235i/6236i, the internal microphone MIC1 and external microphone MIC2 for Pop-Part™ accessory detection are both differential.

  • Page 10: Audio Troubleshooting

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting signals are differential type. Also, MICB1 is used for MIC1 and MICB2 is used for MIC2 and MIC3 (Universal Headset). UHJ MIC3 MIC2 MIC1 Ear Piece Figure 6: Audio components Audio Troubleshooting When troubleshooting the audio, make these common checks (see Figure •...
  • Page 11 6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Audio Amplifier Ear Piece Audio ASIP’s MIC2 DC Block Caps FM Radio Lines MIC3 MIC1 Audio ASIP’s Figure 7: UEMEK Side of Audio Diagram ©2005 Nokia Corporation Issue 1 04/2005 Company Confidential...

  • Page 12: Audio Phoenix Interface

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Audio Phoenix Interface Run Audio Test in Phoenix to check the audio functionality. MiC1- Use first option to route the audio from the internal microphone to the headset speaker. MiC2- Use second option to route the audio signal from the headset microphone to internal ear piece.

  • Page 13: Camera Troubleshooting

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting picture and sends data back to D2800 for processing through CCP lines. After D2800 finishes with all image processing, the image is stored in the flash memory. Figure 9: Camera and HWA connections to the baseband...

  • Page 14: Camera Phoenix Interface

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting V 2.8V GENIO(27) (EN) GENIO(24) (9.6Mhz) Camera socket inspection VDIG 1.8V GENIO(25) GENIO(26) Raw Image Data Figure 10: Camera socket and checkpoints Camera Phoenix Interface Run Camera Contol in Phoenix to check the camera functionality.

  • Page 15: Fm Radio

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Figure 11: Camera Control in Phoenix FM Radio How the FM Radio Works D2800 turns on the FM radio and sets the frequency using CBUS serial interface as the communication channel. A high frequency FM radio signal come in through RFIN1 Pin to the FM radio chip, then it gets demodulated into a low frequency signal and send to UEMEK for amplification.

  • Page 16: Fm Radio Phoenix Interface

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting • If 6 is correct, then Check EUMEK for shorts, voids, and misalignments • If UEMEK and FM Radio Chip is correct, then check system connector VAFR VAFL FM Radio Chip (always the check solder) VANA (2.8V)

  • Page 17: Usb (Universal Serial Bus)

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Power On check box Frequency control Volume control Figure 14: Phoenix FM Radio Control panel USB (Universal Serial Bus) How USB Interface Works When Phone connects to a computer using a DKU-2 data cable the computer will provide Vbus (5V) to and pull down D+ a,d D –...

  • Page 18: Usb Troubleshooting

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Figure 15: USB interface block diagram USB Troubleshooting First connect phone to computer using a DKU-2 data cable. Check under device manager to see if the computer recognizes the phone as a USB device. If the phone is recognizes, there is no hardware fault and you can stop troubleshooting.
  • Page 19 6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting • Check Vout, Vflash1, and ACI Line. If not correct, check UEMEK under X-ray or change part. • Check for activity on the USB D+ and USB D – lines, if nothing check D2800 under X-ray or change part.

  • Page 20: Usb Phoenix Interface

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Figure 18: USB Vout USB Phoenix Interface Run the USB Tests in Phoenix to check the USB functionality: Figure 19: USB Phoenix Interface ©2005 Nokia Corporation Page 20 Company Confidential Issue 1 04/2005...

  • Page 21: Display

    Baseband Description and Troubleshooting Display How the Display Works Nokia 6235/6235i/6236i has a large 128 x 128 display with 65,536, that D2800 controls through a serial interface and UEMEK powers using VIO and VFlash1. Figure 20: Nokia 6235/6235i/6236i Display Display Troubleshooting...

  • Page 22: Display Backlight Troubleshooting

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting SCLK VFlash1 Figure 21: Display Chips and Frequency Display Backlight Troubleshooting When troubleshooting the display backlight, make these common checks (see Figure 29 Figure 30): • Perform visual inspection of LCD connector and LED Driver circuitry •...
  • Page 23 6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting • Check Rset (33 Ohms) • Check Vbat(~4V) and Vin(~4V) are present. If not, check power supply connection. VLED- VLED+ VBat Rset Display LED Driver VLED- VLED+ Dlight Figure 22: Display Backlight Chip and Diagram ©2005 Nokia Corporation...

  • Page 24: Display Phoenix Interface

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Display Phoenix Interface Run the Display Test and Display Tune in Phoenix to check the display. Figure 23: Phoenix Display Test option Figure 24: Phoenix Display Tune option Keypad Backlight How the Keypad Backlight Works Klight coming out of UEMEK controls the keypad backlight LED’s.

  • Page 25: Keypad Backlight Troubleshooting

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting set for all the branches by Rset which in this case is 12k Ohms and equates to 10mA through each LED. Figure 25: Keypad Backlight Diagram Keypad Backlight Troubleshooting When troubleshooting keypad backlight, make these common checks (see...
  • Page 26 6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Vout (~3.5V) Klight (~Vbat) Rset (12k Ohms) Iset (0.5V) Vbat Vout Figure 26: Keypad Backlight Chip and Diagram ©2005 Nokia Corporation Page 26 Company Confidential Issue 1 04/2005...

  • Page 27: Keypad Backlight Display Phoenix Interface

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Keypad Backlight Display Phoenix Interface Run the Display Test in Phoenix to check the keypad backlight. Turn on Dlight Turn on Klight Figure 27: Phoenix Display Test option How GPS Works This is a 911 GPS service only.

  • Page 28: Gps Troubleshooting

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting synchronize with the phone using the 19.2Mhz clock. The phone locates the closest satellite and downloads the location coordinates to send them to the Emergency desk. Figure 28: GPS Block Diagram GPS Troubleshooting When troubleshooting GPS, make these common checks (see...
  • Page 29 6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting • Check RF Data and Clk activity Figure 29: GPS Power VCore or VIO ©2005 Nokia Corporation Issue 1 04/2005 Company Confidential Page 29...
  • Page 30 6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting VCore (1.57V) VIO (1.8V) VREF_GPS GPS_CLK GPS_SPI_EN GPS_SPI_DATA GPS_SPI_CLK VDD_1O_GPS GPS_U2TX GPS_B3 GPS_U2RX GPS_B2 GPS_Sleepx GPS_B1 GPS_Sleep_Clk GPS_B0 GPS_UI_RX GPS_CLK GPS_UI_TX GPS_INT_UI_CLK GPS_UI_DATA-RDY GPS_RF_CLK GPS_EN_RESET Figure 30: GPS Chip ©2005 Nokia Corporation Page 30...

  • Page 31: Gps Phoenix Interface

    SIM Card How SIM Card Works Nokia 6235/6235i/6236i supports two types of SIM cards that work at 1.8V and 3.0V. When you power up your phone with a SIM card, D2800 sends a 1.8V signal to the SIM card and waits for the SIM card’s response and identification. After a wait period, if there is no answer from the SIM card, the phone will send another signal at 1.8V.

  • Page 32: Sim Card Troubleshooting

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting UEMEK acts as a level shifter and raises the signal to 3.0V. If there is still no response, the phone does not allow access. If there is a response, then phone powers up. Figure 32: SIM Card Block Diagram...
  • Page 33 6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting • Check Vsim 1.8V or 3.0V. Vsim comes from UEMEK and goes through the SIM ESD Protection chip. Check for bad or damaged solder joints. Replace chips, if necessary. Figure 33: Vsim check •...
  • Page 34 6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Figure 34: Detection sequence • Verify communication signals Figure 35: Commuication signals • If no signals are present: (1) check contacts on Sim Connector are correct, (2) check ESD Chips are correct, and (3) check UEMEK are correct. Replace damaged parts, if necessary.

  • Page 35: Sim Card Phoenix Interface

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Sim Card Phoenix Interface Run the SIM-Lock Status in Phoenix to test a SIM (or RUIM) card. Figure 37: Phoenix SIM Testing options Infrared How Infrared Works D2800 enables the infrared (IR) module by switching high GenIO (23). The UEMEK provides two power supplies to the infrared module: VIO for digital Logic and Vflash1 for ©2005 Nokia Corporation...

  • Page 36: Infrared Troubleshooting

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting infrared supply. The Vbat powers up the IR LED. This interface receives data from and transmits data to peripheral equipment through the IrRX and IrTX line. Figure 38: Infrared Block Diagram Infrared Troubleshooting When troubleshooting infrared, make these common checks (see...

  • Page 37: Infrared Phoenix Interface

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting IR Module VFlash1 GENIO(23) IRRX IRTX Vbat Figure 39: Infrared Chip and Diagram Infrared Phoenix Interface Run the IR Test in Phoenix to test infrared. Figure 40: Phoenix IR Test options ©2005 Nokia Corporation...

  • Page 38: System Connector

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting System Connector Figure 41 provides a mapping for the system connetor. Figure 41: System Connector ©2005 Nokia Corporation Page 38 Company Confidential Issue 1 04/2005...

  • Page 39: Accessory Detection

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Accessory Detection Figure 42 provides a diagram that display how the phone detects accessories. Dummy accessories pull down to GND ACI Line. Smart accessories pull down ACI line with a 56K Ohm resistor allowing communication between accessory and UEMEK.

  • Page 40: Battery (Lynx) Interface Circuit

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Battery (Lynx) Interface Circuit Figure 43 provides a diagram of the battery interface circuit. The BSI voltage level for the normal mode is 1.23V, for the test mode is 170MV, and for the local mode is 90MV.

  • Page 41: Pwb Overview

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting PWB Overview Bottom Board Figure 44: PWB - Bottom ©2005 Nokia Corporation Issue 1 04/2005 Company Confidential Page 41...

  • Page 42: Top Board

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Top Board Figure 45: PWB - Top ©2005 Nokia Corporation Page 42 Company Confidential Issue 1 04/2005...

  • Page 43: Main Test Points

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Main Test Points Current Test Points VSIM VCOREIn VR1A VR1B VFlash1 VANA VAUX VBATbb Figure 46: Current Test Points Current too High at Zero Test Check the following points, if the current is too high at zero (see...

  • Page 44: Terminal In Local Mode Test

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting 3. Is System clock at 19.2MHz 4. Is Sleep Clock at 32kHz 5. If all the above checks pass, then check whether terminal is jammed or a flash fault exists. R2206 X2000 VBAT R2203...

  • Page 45: Display Test

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting Display Test Check the following points for the display (see Figure 47): 1. Is the VBAT voltage at X2000? 2. Is the VBAT voltage at C2000? 3. Is the BSI line at R2206? 4.

  • Page 46: Common Problems

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting UEME Battery Bar Scroll F2000 V2000 Figure 48: Charging Checks Common Problems The following section has a list of common problems, along with some standard checks. No Communication During Flash • Make sure good connection between flash adaptor and phone •...

  • Page 47: Failed Self Test/Calibrate

    6235/6235i/6236i (RM-60) Nokia Customer Care Baseband Description and Troubleshooting • Make sure phone was programmed/flashed Failed Self Test/Calibrate • Make sure phone is in local mode • Make sure power supply provides enough current (usually approximately 500mA and 2A for tuning) •...

  • Page 48: No Lcd Display

    6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting No LCD Display • Check for bad connections • Check for a cracked or damaged display • Probe test points as described in the troubleshooting guide for missing for incorrect signal level ©2005 Nokia Corporation...

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6235i6236iRm-60

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