Nokia 6235 Service Manual 08rm60bb
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 ........................................................................................................................................ 8
Flashing Tool .................................................................................................................................................8
Flashing Phoenix Interface .......................................................................................................................9
Audio.................................................................................................................................................................. 9
How the Audio Works ................................................................................................................................9
Audio Troubleshooting .............................................................................................................................10
Audio Phoenix Interface ..........................................................................................................................12
Camera............................................................................................................................................................ 12
How the Camera Works ...........................................................................................................................12
Camera Troubleshooting ..........................................................................................................................13
Camera Phoenix Interface .......................................................................................................................14
FM Radio ........................................................................................................................................................ 15
How the FM Radio Works .......................................................................................................................15
FM Radio Test .............................................................................................................................................15
FM Radio Troubleshooting ......................................................................................................................15
FM Radio Phoenix Interface ...................................................................................................................16
USB (Universal Serial Bus)......................................................................................................................... 17
How USB Interface Works .......................................................................................................................17
USB Troubleshooting ................................................................................................................................18
USB Phoenix Interface .............................................................................................................................20
Display ............................................................................................................................................................ 21
How the Display Works ............................................................................................................................21
Display Troubleshooting ..........................................................................................................................21
Display Backlight Troubleshooting .......................................................................................................22
Display Phoenix Interface .......................................................................................................................24
Keypad Backlight ......................................................................................................................................... 24
How the Keypad Backlight Works ........................................................................................................24
Keypad Backlight Troubleshooting .......................................................................................................25
Keypad Backlight Display Phoenix Interface .....................................................................................27
GPS................................................................................................................................................................... 27
How GPS Works .........................................................................................................................................27
GPS Troubleshooting ................................................................................................................................28
GPS Phoenix Interface ..............................................................................................................................31
SIM Card......................................................................................................................................................... 31
How SIM Card Works ...............................................................................................................................31
SIM Card Troubleshooting ......................................................................................................................32
Sim Card Phoenix Interface ....................................................................................................................35
Infrared........................................................................................................................................................... 35
How Infrared Works ..................................................................................................................................35
Infrared Troubleshooting .........................................................................................................................36
Infrared Phoenix Interface ....................................................................................................
System Connector........................................................................................................................................ 38
Accessory Detection.................................................................................................................................... 39
Battery (Lynx) Interface Circuit............................................................................................................... 40
PWB Overview .............................................................................................................................................. 41
..................37
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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
Common Problems ...................................................................................................................................... 46
No Communication During Flash ..........................................................................................................46
No Communication During Alignment ................................................................................................46
Failed Self Test/Calibrate .........................................................................................................................47
Phone Not Powering Up ..........................................................................................................................47
Shut Down After 32 Seconds .................................................................................................................47
No Audio ......................................................................................................................................................47
Key Pads Malfunction ..............................................................................................................................47
No LCD Display ...........................................................................................................................................48
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Baseband Description and Troubleshooting Nokia Customer Care
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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):
• D2200 or UEMEK 2VO — Universal Energy Management Enhanced Integrated
Circuit (UEME IC), which includes the audio circuits, charge control, and voltage
regulators
• D2800 or TIKUEDGE v1.1 — Main mobile terminal 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
1070 mA/h.
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Baseband Description and Troubleshooting
Battery
UHS Jack
DC Jack
Tomahawk
Antenna
Bluetooth
Zocus
Nut
USB
Production
Test IF
Sim MMC
D2200
32 KHz
Amplifier
Regulator
Mic
IHF Speaker
Regulation
Charge Control
EarPiece
Audio
FBUS / MBUS
Vibra
SIM I/F
Disp BL’s
RTC
VIO
CBUS
RF
D
B
U
S
PWM
PWM
Cam Flash
Int Display
Parallel
Ext Display
GPS
PCM / UART
UART
D2800
MCU ARM925
19.2 MHz
FM Radio
Flash Memory
(Program,
NOR)
Flash Memory
(User, NAND)
PDRAM
C-DSP Lead3
A-DSP Lead 3
Serial
Keyboard
EL
2G System Logic
Camera
SDRAM
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.
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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
UEMEK and D2800 (see Figure 2).
Reference signal
PwrOnX
Charger Detection
RTC
UEMRSTX
VCORE
VFlash1
VIO
VANA
VR3
19.2MHz Clk
PURX
Reset mode is entered and
the watchdog starts
End of settling time (only if Vbat > Vcoff+_);
VFLASH1 regulator enabled
VR3, VANA, VIO, and VCORE enabled;
PURX held LOW
D2800 processor, MCU, and DSP are
reset; VCTCXO regulator forced on
Sleep Clock
t1 t2 t4t3
t1 = 20ms
t2 = 200ms
t3 = 500us
t4 = 20ms
Figure 2: Power-on sequence and timing
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Baseband Description and Troubleshooting
Flash Programming
Flashing Tool
Figure 4 shows the DA-54 flashing tool.
Figure 3: Power Up Sequence
Figure 4: DA-54 Flashing Tool
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Nokia Customer Care Baseband Description and Troubleshooting
Flashing Phoenix Interface
Run EZ Flash in Phoenix to flash the phone.
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.
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.
However, the Universal Headset interface is single ended. The microphone signals from
different sources are connected to separate inputs at UEMEK. Inputs for the microphone
Figure 5: EZ Flash in Phoenix
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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
IHF
Audio Troubleshooting
When troubleshooting the audio, make these common checks (see Figure 7):
• 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. Only when
using IHF signal will be amplify by a factor of 8.
Ear Piece
Figure 6: Audio components
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Nokia Customer Care Baseband Description and Troubleshooting
Audio Amplifier
IHF
FM Radio Lines
Audio ASIP’s
DC Block Caps
Audio ASIP’s
Ear Piece
MIC2
UHJ
MIC3
MIC1
Figure 7: UEMEK Side of Audio Diagram
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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. The UEM automatically re-routes
the audio signal to the UHJ.
Ear Piece - Use second option to hear something
from internal ear piece.
IHF - Use the fifth option to route audio signal to IHF
speaker out.
Camera
How the Camera Works
When you select the view finder to take a picture, the D2800 activates the camera by
turning on GENIO(27) and GENIO(24)9.6MHz. Once the camera is initialized, D2800
sends control commands through the I2C (GENIO (25&26) interface. The camera takes a
Figure 8: Audio Test in Phoenix
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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
Camera Troubleshooting
When troubleshooting the camera, make these common checks (see Figure 13):
• Check Power Supply V2.8 and VDIG
• Check Sleepx is high
• Camera Enable GenIO(27) is high
• Check Camera Clk on GenIO(24)
• Check Control line I2C on GenIO 25& 26
• Check raw data lines going back to D2800
• Inspect camera socket and replace Camera
• Check D2800 for Solder problems and replace, if necessary
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Baseband Description and Troubleshooting
V 2.8V
GENIO(27) (EN)
Camera socket inspection
Figure 10: Camera socket and checkpoints
Camera Phoenix Interface
Run Camera Contol in Phoenix to check the camera functionality.
GENIO(24) (9.6Mhz)
GENIO(25)
GENIO(26)
Camera with integrated VGA camera and
camcorder functionality
VDIG 1.8V
Raw Image Data
Use Viewfinder On option to view image
in the PC Window
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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. The amplify signal then get routed back to either universal
headset or to the system connector for stereo headset.
Figure 12: FM Radio (N356), Audio (N150), antenna, and digital interface connections
FM Radio Test
To hear the FM radio, you first connect headset to Pop-Part™ or UHJ ports because the
headset will be an FM radio antenna. And you have to connect headset to UHJ port to
control the FM radio by using Phoenix. But if you connect a headset (such as HDS-3) to
Pop-Part™ connector, then you can’t control the phone because you’ve already occupied
the connection port (Pop-Part™), so in this case 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 13):
• Check Power Supply VIO and VANA
• Check SleepCLK
• Check FMANT
• Check for activity on CBUS
• Check output of FM radio on VAFR and VAFL
• If 6 is not correct, then Check FM radio chip for shorts, voids, and misalignments
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