Nokia 6275 Guide

Nokia Customer Care
6275/6275i (RM-154)
Mobile Terminal
Issue 1 - September 2006 Company Confidential ©2006 Nokia Corporation
Baseband Description and
Troubleshooting

6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
Page 2 Company Confidential Issue 1 - September 2006
Contents Page
Introduction ..................................................................................................................................................... 4
Baseband Components.................................................................................................................................. 5
Power-Up Sequence ...................................................................................................................................7
FM Radio ........................................................................................................................................................... 9
FM Radio Test ...............................................................................................................................................9
FM Radio Troubleshooting ........................................................................................................................9
FM Radio Control - Phoenix Interface ................................................................................................10
GPS................................................................................................................................................................... 12
GPS Troubleshooting ................................................................................................................................13
GPS Phoenix Interface ..............................................................................................................................14
Bluetooth ....................................................................................................................................................... 15
Bluetooth Troubleshooting .....................................................................................................................15
Bluetooth Phoenix .....................................................................................................................................16
SIM Card......................................................................................................................................................... 17
SIM Card Troubleshooting ......................................................................................................................17
SIM Card Phoenix Interface ....................................................................................................................19
Camera............................................................................................................................................................ 20
Camera Troubleshooting ..........................................................................................................................20
Camera Phoenix Interface .......................................................................................................................21
MicroSD.......................................................................................................................................................... 22
IR ...................................................................................................................................................................... 23
IR Troubleshooting ....................................................................................................................................23
IR Phoenix Interface .................................................................................................................................24
USB .................................................................................................................................................................. 25
USB Troubleshooting ................................................................................................................................25
USB Phoenix Interface .............................................................................................................................26
Display ............................................................................................................................................................ 27
Display Troubleshooting ..........................................................................................................................27
Display and Keypad Backlight Troubleshooting ................................................................................28
Display Phoenix Interface .......................................................................................................................29
Keypad Backlight Troubleshooting .......................................................................................................29
Audio............................................................................................................................................................... 31
Audio Troubleshooting .............................................................................................................................31
Audio Phoenix Interface ..........................................................................................................................32
System Connector........................................................................................................................................ 33
Accessory Detection .................................................................................................................................34
Flash Programming ..................................................................................................................................... 35
Flashing Tool ...............................................................................................................................................35
Flashing Phoenix Interface........................................................................................................................ 35
Battery (Lynx) Interface Circuit............................................................................................................... 37
Charging......................................................................................................................................................... 38
Alignment ...................................................................................................................................................... 39
AMS Baseband Calibration...................................................................................................................... 40
Final UI Check............................................................................................................................................... 41
Problems During Flash and Alignment .................................................................................................. 42
No Communication - Flash .....................................................................................................................42
No Communication - Alignment ...........................................................................................................42

Nokia Customer Care Baseband Description and Troubleshooting
6275/6275i (RM-154)
Issue 1 - September 2006 Company Confidential Page 3
Failed Self Test/Calibration .....................................................................................................................42
Other Potential Problems .......................................................................................................................... 43
Mobile Terminal Does Not Power Up ...................................................................................................43
Shutdown after 32 Seconds ...................................................................................................................43
No Audio ......................................................................................................................................................43
Keypad Malfunction .................................................................................................................................43
No LCD Display ...........................................................................................................................................43
Phoenix Tools................................................................................................................................................ 44
Local Mode ..................................................................................................................................................44
Reading the Mobile Terminal .................................................................................................................45
Running the Self Test ...............................................................................................................................47
Checking the Baseband Regulator/General I/O parameters ..........................................................48
Flashing the Mobile Terminal .................................................................................................................49
Flashing - EZ-Flash................................................................................................................................ 49
Reference ....................................................................................................................................................... 50
Signal References ......................................................................................................................................50

6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
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Introduction
The 6275/6275i 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):
• D2200 — Universal Energy Management Enhanced Integrated Circuit (UEMEK IC),
which includes the audio circuits, charge control, and voltage regulators
• D2800 — Main processor, which includes system logic for CDMA, two Digital
Signal Processors (DSPs), the Main Control Unit (MCU), and the memory.
The BL-6C Li-ion battery is used as the main power source and has a nominal capacity of
1150 mAh.

Nokia Customer Care Baseband Description and Troubleshooting
6275/6275i (RM-154)
Issue 1 - September 2006 Company Confidential Page 5
Baseband Components
Figure 1: PWB - bottom side

6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
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Figure 2: PWB - top side

Nokia Customer Care Baseband Description and Troubleshooting
6275/6275i (RM-154)
Issue 1 - September 2006 Company Confidential Page 7
Figure 3:
Reset mode is entered and the watchdog
starts. VCORE is enabled, and provides
power to the D2800.
End of settling time (only if Vbat >Vcoff+)
VFlash1 regulator is enabled.
VR3, VANA, VIO are enabled. PURX is held
low.
D2800, MCU, and DSP are reset; PURX
releases.

6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
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Figure 4: flash programming

Nokia Customer Care Baseband Description and Troubleshooting
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Issue 1 - September 2006 Company Confidential Page 9
FM Radio
The D2800 turns on the FM radio and sets the frequency, using the CBUS serial interface
as the communication channel. The high frequency FM radio signal comes in through the
RFIN1 pin to the FM radio integrated circuit. The RF signal is demodulated, and the
resulting audio signal is sent to the UEMEK for amplification. The amplified signal is then
delivered to the universal headset jack (UHJ) or to the Pop-port™ connector to drive a
stereo headset.
Figure 5: FM radio, audio, antenna, and digital interface connections
FM Radio Test
To hear the FM radio, first connect a headset to either the Pop-port or the UHJ port. The
headset wiring functions as an FM radio antenna. If the Pop-port connector is in use by
the Phoenix service program, connect the headset to UHJ port to control the FM radio.
If you connect a headset (such as HDS-3) to the Pop-port connector, you cannot control
the mobile terminal because you already occupied the Pop-port connection port. If you
connect a headset, you have to have jumper wires on production test points (Fbus/Tx
RX,GND).
FM Radio Troubleshooting
When troubleshooting the FM radio, make these common checks (see Figure 6):
• Power supplies VIO and VANA
• Sleep_CLK
• FMANT input to FM radio
• CBUS interface by probing CBUS_EN and looking for activity
• Output of FM radio on VAFR and VAFL; it should be a audio signal with a 800mV
DC-offset.

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Baseband Description and Troubleshooting Nokia Customer Care
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• If the audio signal is not correct (with offset of 800 mV DC), then check the FM
radio integrated circuit for shorts, voids, and misalignments.
• If the audio signal is correct (with offset of 800 mV DC), then check the UEMEK
for shorts, voids, and misalignments.
• If the UEMEK and FM radio integrated circuits are okay, check the system
connector.
Figure 6: FM radio integrated circuit
FM Radio Control - Phoenix Interface
Use the Phoenix interface to perform the following tasks:
1. Connect a headset to the UHJ
2. Turn on the FM radio using Phoenix.
FM chip; check solder Ground
VAFL VANA (2.8V)
VAFR
VIO (1.8V) FMANT

Nokia Customer Care Baseband Description and Troubleshooting
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3. Set the frequency and volume.
Figure 7: Phoenix FM Radio control panel
4. Observe that an audio signal is heard in the headset.
5. If FM Radio is working, retest on FinalUI.
Power on
Frequency
control
Frequency
control
Mono/stereo
control
Headset/IHF
control
Mute on/
off control

6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
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GPS
The GPS turns on by using Vcore and VIO from the UEMEK. The GPS communicates with
the D2800 using the UART interface and turns on the GPS engine’s BB integrated circuit
and RF integrated circuit. They synchronize with the mobile terminal using the 19.2 Mhz
clock. The mobile terminal locates the closest satellite and downloads the location
coordinates to send them to the emergency desk.
Figure 8: GPS block diagram
The GPS baseband module performs the following:
• Accepts the GPS raw data from the front end
• Processes the raw data to provide the CE with location information (2 CPUs)
• Accepts commands from the CE
• Manages modes (sleep, idle, etc.)
• Issues RF control commands
• Manages GPS configuration
• Provides power for the FPS RF

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6275/6275i (RM-154)
Issue 1 - September 2006 Company Confidential Page 13
GPS Troubleshooting
Check the following connections and signals (see Figure 9):
• Power source Vcore and VIO
• CLK19M2_GPS = 19.2 Mhz
• VRF is enabled
• VRF_GPS =2.78 V dc
• GPS clock = 16.384 Mhz
• Use Phoenix to run Test Mode 1
•USARTactivity
• GPS antenna
Figure 9: RF and BB GPS integrated circuits (ICs)
•GPS_EN_RESET(1.8V)
• GPS_SLEEPCLK (32.768kHz)
• GPS_SLEEPX
Figure 10: Additional GPS components
GPS clock
CLK19M2_GPS
VRF GPS
BB GPS
RF GPS
VCore (1.35V/
1.05V)
VIO (1.8V)
GPS _SLEEPCLK
GPS_SLEEPX
GPS_EN_RESET

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Baseband Description and Troubleshooting Nokia Customer Care
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GPS Phoenix Interface
Run the GPS Quick Test in Phoenix to check the GPS BB.
Figure 11: Phoenix GPS Quick Test option
CW Test fails unless CW Tone is
injected into the GPS RF Connector

Nokia Customer Care Baseband Description and Troubleshooting
6275/6275i (RM-154)
Issue 1 - September 2006 Company Confidential Page 15
Bluetooth
The Bluetooth radio is shown in the following functional diagram:
Figure 12: Bluetooth diagram
Bluetooth Troubleshooting
Before probing, perform a visual inspection of all components and then check the
following:
• Power supply, VIO
• Soldering
• CLK19M2_BT at the UHF synthesizer
Figure 13: Bluetooth troubleshooting test points
CLK19M2_BT
CLK19M2_GPS

6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
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Bluetooth Phoenix
On the Bluetooth Locals dialog box, click Run to execute the self test for baseband
communication.
Figure 14: Bluetooth Locals dialog box

Nokia Customer Care Baseband Description and Troubleshooting
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Issue 1 - September 2006 Company Confidential Page 17
SIM Card
The 6275/6275i supports two types of SIM cards that work at 1.8 V and 3.0 V dc. When
the mobile terminal is switched on with a SIM card, the D2800 sends a 1.8 V signal to
the SIM card and waits for the SIM card’s response and identification. If there is no
answer from the SIM card, the mobile terminal sends another signal at 1.8 V. However,
the UEMEK then acts as a level shifter and raises the second signal to 3.0 V. If there is
still no response, the mobile terminal does not allow access and displays a prompt to
insert a SIM card. If there is a response, the mobile terminal powers up.
Figure 15: SIM card block diagram
SIM Card Troubleshooting
Use the following steps to troubleshoot the SIM card:
1. Check VSim for a value of either 1.8 V or 3.0 V. The VSim comes from the UEMEK
and goes through the SIM ESD protection integrated circuit. Check for bad or
damaged solder joints. Replace integrated circuits, if necessary.
Figure 16: VSim check

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Baseband Description and Troubleshooting Nokia Customer Care
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2. Check the detection sequence.
Figure 17: Detection Sequence
3. Verify communication signals.
Figure 18: Communication signals
SIM connector
GND
SIM ESD
protection
SIM_DATA
SIM_CLK
SIMRSTX
VSIM

Nokia Customer Care Baseband Description and Troubleshooting
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Issue 1 - September 2006 Company Confidential Page 19
SIM Card Phoenix Interface
Run the SIM-Lock Status test in Phoenix to test a SIM card.
Figure 19: Phoenix SIM/RUIM Test options

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Baseband Description and Troubleshooting Nokia Customer Care
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Camera
When you activate the view finder to take a picture, the D2800 turns the camera on by
turning on GENIO(47) PDN and GENIO(24) 9.6MHz. After the camera initializes, the
D2800 sends control commands through the I2C (GENIO (25 and 26) interface. The
camera takes a picture and sends the raw data back to a separate hardware accelerator
(HWA) device to run the algorithms in the hardware. The HWA performs all tasks to
deliver stills and the viewfinder to the baseband with no further processing required
from the D2800. The D2800 takes the image processed data from the HWA and stores
the image in the Flash Memory or MiniSD.
Camera Troubleshooting
Check the following:
• Power Supply Enable D800_GPIO (47)
• Power Supply V2.8, VDIG and V1.2
• Camera Enable GenIO(27) is High (PDN)
• Camera Clk GenIO(24) (9.6Mhz)
• Control line I2C on GenIO 25 and 26
• CCP data/clk lines from sensor to HWA, then to the D2800
• Camera socket
• D2800 for solder problems; replace if necessary
Figure 20: Camera troubleshooting - part 1
GPIO(47)
V2.8
VDIG 1.8V
V1.2
Raw image data from
sensor to HWA
CCP2/CLKN
CCP2/CLKP
CCP2/DATP
CCP2/DATN
Data/Clk to D2800
CCP1/DATN(1)
CCP1/DATP(0)
GPIO(24), 9.6MHz
Data/Clk to D2800
CCP1/CLKN(2)
CCP1/CLKP(3)