Nokia RM-154, 6275, 6275i Baseband Description and Troubleshooting
Nokia Customer Care
6275/6275i (RM-154)
Mobile Terminal
Baseband Description and
Troubleshooting
Issue 1 - September 2006 Company Confidential ©2006 Nokia Corporation
6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
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 .......................................................................................................
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......................................................................................................
Final UI Check............................................................................................................................................... 41
Problems During Flash and Alignment .................................................................................................. 42
No Communication - Flash .....................................................................................................................42
No Communication - Alignment ...........................................................................................................42
...................27
................ 40
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Nokia Customer Care Baseband Description and Troubleshooting
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
Issue 1 - September 2006 Company Confidential Page 3
6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
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.
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6275/6275i (RM-154)
Nokia Customer Care Baseband Description and Troubleshooting
Baseband Components
Figure 1: PWB - bottom side
Issue 1 - September 2006 Company Confidential Page 5
6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
Figure 2: PWB - top side
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6275/6275i (RM-154)
Nokia Customer Care Baseband Description and Troubleshooting
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.
Figure 3:
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6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
Figure 4: flash programming
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Nokia Customer Care Baseband Description and Troubleshooting
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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6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
• 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.
FM chip; check solder Ground
VAFL
VAFR
VIO (1.8V) FMANT
VANA (2.8V)
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.
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Nokia Customer Care Baseband Description and Troubleshooting
3. Set the frequency and volume.
Power on
Frequency
Frequency
control
control
Mono/stereo
control
Headset/IHF
control
Mute on/
off control
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.
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6275/6275i (RM-154)
Baseband Description and Troubleshooting Nokia Customer Care
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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Nokia Customer Care Baseband Description and Troubleshooting
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
•USART activity
• GPS antenna
GPS clock
VRF GPS
CLK19M2_GPS
Figure 9: RF and BB GPS integrated circuits (ICs)
•GPS_EN_RESET (1.8V)
• GPS_SLEEPCLK (32.768kHz)
• GPS_SLEEPX
VIO (1.8V)
VCore (1.35V/
1.05V)
BB GPS
RF GPS
GPS_EN_RESET
GPS_SLEEPX
GPS _SLEEPCLK
Figure 10: Additional GPS components
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Baseband Description and Troubleshooting Nokia Customer Care
GPS Phoenix Interface
Run the GPS Quick Test in Phoenix to check the GPS BB.
CW Test fails unless CW Tone is
injected into the GPS RF Connector
Figure 11: Phoenix GPS Quick Test option
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Nokia Customer Care Baseband Description and Troubleshooting
Bluetooth
The Bluetooth radio is shown in the following functional 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
CLK19M2_BT
Figure 12: Bluetooth diagram
CLK19M2_GPS
Figure 13: Bluetooth troubleshooting test points
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