Nokia Customer Care 6235/6235i/6236i (RM-60) Mobile Terminals Baseband Description and Troubleshooting Issue 1 04/2005 Company Confidential ©2005 Nokia Corporation
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Contents Page Introduction ..................................................................................................................................................... 5 Power Up Sequence ....................................................................................................................................... 7 Flash Programming ..........................................................................................
Nokia Customer Care 6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Bottom Board .............................................................................................................................................41 Top Board .....................................................................................................................................................42 Main Test Points ........................................................................................
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care This page intentionally left blank.
Nokia Customer Care 6235/6235i/6236i (RM-60) 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.
235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Battery Sim Production Test IF Zocus MMC Regulator 32 KHz Mic D2200 UHS Jack IHF Speaker Amplifier Regulation DC Jack Charge Control EarPiece Audio Nut Tomahawk USB Vibra FBUS / MBUS SIM I/F Disp BL’s CBUS RTC RF Bluetooth GPS PWM VIO Antenna PCM / UART UART Cam Flash D B U S Int Display D2800 Parallel Ext Display MCU ARM925 19.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care 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 UEMEK and D2800 (see Figure 2). Reference signal PwrOnX Charger Detection RTC Reset mode is entered and the watchdog starts UEMRSTX VCORE End of settling time (only if Vbat > Vcoff+_); VFLASH1 regulator enabled VFlash1 VIO VANA VR3 19.
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.
Nokia Customer Care 6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Flashing Phoenix Interface Run EZ Flash in Phoenix to flash the phone. Figure 5: EZ Flash in Phoenix Audio How the Audio Works The baseband supports three microphone inputs and two earpiece outputs. The microphone inputs are MIC1, MIC2, and MIC3: • MIC1 input is used for the phone's internal microphone, • MIC2 input is used for headsets (HDB-4), • MIC3 input is used for the Universal Headset.
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 IHF Figure 6: Audio components Audio Troubleshooting When troubleshooting the audio, make these common checks (see Figure 7): Page 10 • Performed visual inspection of all the ASIP’s and UEMEK • Inject 1KHz signal into MiC1 and trace it all the way to the ear piece.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care Audio Amplifier IHF Ear Piece Audio ASIP’s MIC2 FM Radio Lines DC Block Caps UHJ MIC3 MIC1 Audio ASIP’s Figure 7: UEMEK Side of Audio Diagram Issue 1 04/2005 ©2005 Nokia Corporation Company Confidential Page 11
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. MiC3 - To test MIC3 you need to use the first and second options. Open channel and insert the universal headset.
Nokia Customer Care 6235/6235i/6236i (RM-60) 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 Camera Troubleshooting When troubleshooting the camera, make these common checks (see Figure 13): • Check Power Supply V2.
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.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care 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.
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) VIO (1.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care 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 – lines. The phone will respond by pulling the D+ line high. The computer acknowledges and start transferring data at 12Mbits/sec.
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.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care • 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. USD ESD Protection VFlash1 (2.8V) _OE (1.8V) USB D+ (3.3V) USB D- (3.
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 Page 20 ©2005 Nokia Corporation Company Confidential Issue 1 04/2005
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care 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 When troubleshooting the display, make these common checks (see Figure 21): • Check display is connected properly and is making good contact.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting VIO SDA SCX SCLK VFlash1 Figure 21: Display Chips and Frequency Display Backlight Troubleshooting When troubleshooting the display backlight, make these common checks (see Figure 29 and Figure 30): Page 22 • Perform visual inspection of LCD connector and LED Driver circuitry • If display backlight is not turning on, check VLED +(~10V) and VLED – (~.5V) on display connector.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care • Check Rset (33 Ohms) • Check Vbat(~4V) and Vin(~4V) are present. If not, check power supply connection.
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. Dlight enables the LED driver, which is a constant current supply for all the keypad LED in parallel.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care set for all the branches by Rset which in this case is 12k Ohms and equates to 10mA through each LED.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Vout (~3.5V) Klight (~Vbat) Rset (12k Ohms) Iset (0.
Nokia Customer Care 6235/6235i/6236i (RM-60) 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 GPS How GPS Works This is a 911 GPS service only. This means that when you dial 911, the GPS turns on by using Vcore from the external DC-DC and VIO from UEMEK. GPS communicates with D2800 using the UART interface.
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 Figure 29 and Figure 30): • Check the Power Vcore and VIO • Check that GPS_RF_CLk = 19.2Mhz • Check the GPS_EN_Reset • Check that Sleep_CLK = 32.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care • Check RF Data and Clk activity Figure 29: GPS Power VCore or VIO Issue 1 04/2005 ©2005 Nokia Corporation Company Confidential Page 29
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting VCore (1.57V) VIO (1.
Nokia Customer Care 6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting GPS Phoenix Interface Run the GPS Quick Test in Phoenix to check the GPS BB. CW test fails unless CW tone is injected in GPS RF connector Figure 31: Phoenix GPS Testing option 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.
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.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care • 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.
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.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care 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).
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.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care IR Module GND VIO VFlash1 GENIO(23) IRRX IRTX Vbat Figure 39: Infrared Chip and Diagram Infrared Phoenix Interface Run the IR Test in Phoenix to test infrared.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting System Connector Figure 41 provides a mapping for the system connetor.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care 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. VFlash1 (2.78V) VAUX2 (2.
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.
Nokia Customer Care 6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting PWB Overview Bottom Board Figure 44: PWB - Bottom Issue 1 04/2005 ©2005 Nokia Corporation Company Confidential Page 41
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Top Board Figure 45: PWB - Top Page 42 ©2005 Nokia Corporation Company Confidential Issue 1 04/2005
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting Nokia Customer Care Main Test Points Current Test Points VSIM VR5 VR3 VR4 VR7 VCOREIn VR6 VR2 VR1A VR1B VANA VFlash1 VBATbb VAUX Figure 46: Current Test Points Current too High at Zero Test Check the following points, if the current is too high at zero (see Figure 46 and Figure 47): 1. Is the VBAT contact intact? 2. Measure BB regulator voltage levels: • VANA—2.78V • VIO—1.8V • VCORE—1.35V/1.05V @ Sleep • VFlash1—2.
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 GND R2203 BSI VBAT System Clock Sleep Clock Figure 47: Test Points when current too high Terminal in Local Mode Test Check the following points, to see if terminal is in local mode (see Figure 47): 1. Is the BSI line at X2000? 2. Is the BSI line at R2203? 3.
Nokia Customer Care 6235/6235i/6236i (RM-60) 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. Is the BSI line at R2203? 5. Is Sleep Clock at 32kHz? 6. Is System Clock at 19.2kHz Charging Test Check the following points, charging (see Figure 48): 1. Does the battery bar scoll work? 2. Measure the BTEMP at V2000, check if it is at 25 degrees C.
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 • Phone has to be powered by prommer (FPS-8) • Check Baseband regulators VR3, VIO, VCORE, VFLASH1 • Phone will not able to flash without 19.
Nokia Customer Care • 6235/6235i/6236i (RM-60) 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) • Use the troubleshooting guide’s float chart to verify the failed circuit • Check the signals and voltage levels per troubleshooting guide.
6235/6235i/6236i (RM-60) Baseband Description and Troubleshooting No LCD Display Page 48 • 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 Company Confidential Issue 1 04/2005
