Nokia 6235 Guide
Nokia Customer Care
6235/6235i/6236i (RM-60)
Mobile Terminals
Issue 1 04/2005 Company Confidential ©2005 Nokia Corporation
Baseband Description and
Troubleshooting
6235/6235i/6236i (RM-60)
Baseband Description and Troubleshooting
Page 2 ©2005 Nokia Corporation Company Confidential Issue 1 04/2005
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 ......................................................................................................................37
System Connector........................................................................................................................................ 38
Accessory Detection.................................................................................................................................... 39
Battery (Lynx) Interface Circuit............................................................................................................... 40
PWB Overview .............................................................................................................................................. 41
Nokia Customer Care Baseband Description and Troubleshooting
6235/6235i/6236i (RM-60)
Issue 1 04/2005 ©2005 Nokia Corporation Company Confidential Page 3
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
6235/6235i/6236i (RM-60)
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Baseband Description and Troubleshooting Nokia Customer Care
Page 4 ©2005 Nokia Corporation Company Confidential Issue 1 04/2005
Nokia Customer Care Baseband Description and Troubleshooting
6235/6235i/6236i (RM-60)
Issue 1 04/2005 ©2005 Nokia Corporation Company Confidential Page 5
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.
6235/6235i/6236i (RM-60)
Baseband Description and Troubleshooting
Page 6 ©2005 Nokia Corporation Company Confidential Issue 1 04/2005
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.
PWM
Parallel
Battery Zocus
Sim MMC
D2800
MCU ARM925
PDRAM
C-DSP Lead3
A-DSP Lead 3
2G System Logic
D2200
Regulation
Charge Control
Audio
FBUS / MBUS
SIM I/F
RTC
Tomahawk
DC Jack
Int Display
Production
Test IF
RF
Keyboard
Mic
IHF Speaker
Disp BL’s
Camera
IRDA
Bluetooth
FM Radio
Antenna
SMPS
SDRAM
CBUS
Nut
USB
PCM / UART
VCORE
VIO
Regulator
Serial
Ext Display
UHS Jack
EL
Amplifier
EarPiece
Vibra
Cam Flash
PWM
Flash Memory
(Program,
NOR)
Flash Memory
(User, NAND)
D
B
U
S
32 KHz
GPS
19.2 MHz
UART
Nokia Customer Care Baseband Description and Troubleshooting
6235/6235i/6236i (RM-60)
Issue 1 04/2005 ©2005 Nokia Corporation Company Confidential Page 7
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).
Figure 2: Power-on sequence and timing
Reference signal
PwrOnX
Charger Detection
RTC
UEMRSTX
VCORE
VFlash1
VIO
VANA
VR3
19.2MHz Clk
PURX
t1 t2 t4t3
Sleep Clock
t1 = 20ms
t2 = 200ms
t3 = 500us
t4 = 20ms
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
Nokia Customer Care Baseband Description and Troubleshooting
6235/6235i/6236i (RM-60)
Issue 1 04/2005 ©2005 Nokia Corporation Company Confidential Page 9
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.
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
6235/6235i/6236i (RM-60)
Baseband Description and Troubleshooting
Page 10 ©2005 Nokia Corporation Company Confidential Issue 1 04/2005
signals are differential type. Also, MICB1 is used for MIC1 and MICB2 is used for MIC2
and MIC3 (Universal Headset).
Figure 6: Audio components
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.
UHJ MIC3
IHF
MIC2 MIC1
Ear Piece
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