Nokia 1265 Guide

Nokia Customer Care
1265 (RH-103)
Mobile Terminal
Baseband Description and
Troubleshooting
Issue 1 04/2007 Company Confidential ©2007 Nokia Corporation

1265 (RH-103)
Baseband Description and Troubleshooting
Contents Page
Introduction............................................................................................................... 3
Baseband and Power Management Architecture .................................................... 4
Power Up and Reset ................................................................................................ 5
Power Up .......................................................................................................6
Power Off.......................................................................................................7
Power Consumption and Operation Modes ...................................................7
Power Distribution .................................................................................................... 8
Clock Distribution...................................................................................................... 9
System Clocks .............................................................................................10
TCXO........................................................................................................... 11
SLEEP Crystal Circuit for 32.768 kHz..........................................................12
SBI CLK Interface ........................................................................................14
Flash Programming Error Description.................................................................... 14
Charging Operation ................................................................................................ 15
Battery .........................................................................................................15
Charging Circuitry ........................................................................................15
Charger Detection........................................................................................16
Charge Control ............................................................................................17
Audio ...................................................................................................................... 17
Display and Keyboard ............................................................................................ 18
Accessories ............................................................................................................ 18
Charging ......................................................................................................19
Headset Detection .......................................................................................19
RUIM CARD ........................................................................................................... 19
Test Points – Top ................................................................................................... 21
Test Points – Bottom .............................................................................................. 24
Troubleshooting...................................................................................................... 26
Mobile Terminal is Dead...............................................................................27
Flash Faults .................................................................................................28
Power Does Not Stay ON or the Mobile Terminal is Jammed ......................29
Charger Faults .............................................................................................30
Audio Faults.................................................................................................31
Display Faults ..............................................................................................35
Keypad Faults ..............................................................................................36
Keypad Faults ..............................................................................................37
Page 2 ©2007 Nokia Corporation Company Confidential Issue 1 04/2007

1265 (RH-103)
Nokia Customer Care Baseband Description and Troubleshooting
Introduction
The mobile terminal using a CDMA single mode engine (Cellular/ 800) with
Qualcomm baseband consists of the following ASICs:
●Qualcomm Single Chip 6010, including RF transmitter and receiver,
Baseband and Power management these three categories
●32Mb Flash memory with 16Mb of Psram memory
The baseband is consisted of an Arm926EJ-S processor, a CDMA processor, two
QDSP4000 processors, Codec, Analog interface for RF and controllers for GPIOs,
UART, EBI, RUIM & peripheral interfaces, all of which are necessary to complete the
entire CDMA baseband system. The ARM926EJ-S is a high-performance, low-power
microprocessor. The features of the ARM microprocessor include a 3-stage pipelined
RISC architecture, both 32-bit ARM and 16-bit THUMB instruction sets, a 32-bit
address bus, and a 32-bit internal data bus. The two low-power, high-performance
QDSP4000 digital signal processor cores, one is for the modem (mDSP) that
dedicated to modem functions and CDMA signal processing, and the other is for
applications (aDSP) such as all vocoder functions, audio application, and CMX.
QSC6010 has two Advanced High-speed Bus (AHB),a fast peripheral bus (FPB), and
two Mobile Station Modem(MSM) bridge. Main AHB bus is controlled by the ARM926
for data and instructions. Second AHB allows mDSP and aDSP to access external
peripherals via DME interfaces. The FPB offloads the Main AHB so that a high
number of slaves does not limit its bus speed. MSM bus bridges support peripherals
that do not have an AHB interface.
The mobile terminal supports standard Nokia 2-wire and 3 wire chargers (AC-3, AC-4,
DC-4). However, the 3-wire chargers are treated as 2-wire chargers. The pulse
width modulation (PWM) controls signal for controlling the 3-wire charger is ignored.
The MSM and PM energy management software control the charging.
BL-4C (860 mAh) lithium-ion battery is used as the main power source.
Issue 1 04/2007 ©2007 Nokia Corporation Company Confidential Page 3

1265 (RH-103)
Baseband Description and Troubleshooting
Baseband and Power Management Architecture
Figure 1: Baseband Diagram
Figure 2: Power Management of QSC6010
Page 4 ©2007 Nokia Corporation Company Confidential Issue 1 04/2007

1265 (RH-103)
Nokia Customer Care Baseband Description and Troubleshooting
Power Up and Reset
The QSC6010 controls the power up and reset. The baseband can power up in the
following ways:
zPressing the Power button, which means to ground the KPD_PWR_N
(“PHONE_ON_N” pin in 1265 schematic) pin of the QSC6010
zConnecting the charger to the charger input.
After receiving one of the above signals, the PM will start to enter reset mode. The
watchdog starts, and if the battery voltage is greater than its threshold (3V), a 6ms
delay starts to allow MSM to settle. After this delay elapses, the VERG_MSMC
regulator enables. Then, VERG_MSMP, VERG_MSMA & VERG_TCXO regulators
are enabled in sequence after MSMC. There is a 120us (4 Sleep_Clocks) delays
between each regulator’s turn on. The PON_RESET_N (“RESIN_N” pin in 1265
schematic) line holds low for another 20ms and is sent to MSM. Resets are
generated for the MSM’s internal MCU and its internal DSP, and MSM sends
TCXO_ON (“TCXO_EN” pin in 1265 schematic) signal to PM to enable TCXO. After
PON_RESET_N goes high, MSM holds PS_HOLD at low state for 200ms and then
drives PS_HOLD to high state. This will keep all regulators at on state in order to
complete this power on sequence. KPD_PWR_N key can be released after
PS_HOLD goes high.
The RESOUT_N from QSC6010 is used to reset flash memory during power up and
to put the flash memory in power down during sleep mode. LCD_RS from QSC6010
is used to reset LCD module during power up. All baseband regulators are switched
on when the PM is powered on. The QSC6010’s internal watchdog runs and resets
during normal operation. If the watchdog expires, it will generate a reset signal to
reset to MSM status. Then, QSC6010 drives RESOUT_N and LCD_RS low to reset
flash memory and LCD module.
Figure 3 represents the PM start-up sequence from reset to power-on.
Issue 1 04/2007 ©2007 Nokia Corporation Company Confidential Page 5

1265 (RH-103)
Baseband Description and Troubleshooting
Figure 3: Power-on & off sequence and timing
Power Up
The mobile terminal can use the power key or a charger to power up.
Power Key
When the power key is pressed, the PM enters the power-up sequence. Pressing the
power key causes the KPD_PWR_N (PHONE_ON_N pin in 1265 schematic) pin to
GND. The KPD_PWR_N signal is not part of the keypad matrix. The power key is
only connected to the PM. This means that when the power key is pressed, an
interrupt will be generated to the MSM in order to power on the MCU. The MCU
reads the QSC6010’s interrupt register and notifies that it is a KPD_PWR_N interrupt.
The MCU reads the status of the KPD_PWR_N signal using the control bus. If the
KPD_PWR_N signal stays low for a certain time, the MCU accepts this as a valid
power-on state and continues with the software baseband initialization. If the power
key does not indicate a valid power-on situation, the MCU powers off the baseband.
Charger
Charging is controlled by start-up charging circuitry in order to detect and start
charging in cases the main battery is empty and the PM has no supply.
External Supply Source is Detected
If a valid source is applied to VCHG (pin V15 of QSC6010) and the battery voltage of
VPH_PWR exceeds PM’s valid UVLO (2.5V) threshold, the power-on sequence of
PM is initiated and enables its internal regulators. UVLO is the minimum voltage
required for QSC6010 operation. If the entire power-on sequence is successful, the
appropriate interrupt from PM will be sent to the MSM. Once the battery voltage rises
Page 6 ©2007 Nokia Corporation Company Confidential Issue 1 04/2007

1265 (RH-103)
Nokia Customer Care Baseband Description and Troubleshooting
above 3.0V (min. MSM operation voltage), code start running on MSM. The MSM
reads PM registers to identify the power source and whether battery charging is
required. If a valid supply voltage is applied while the PM is on, the power-on
sequence is skipped. A charging sequence will then be initiated.
Power Off
While the PS_HOLD signal from the MSM is high, and the PM is in one of its
power-on states. Under this condition, the PM continually monitors three events that
could trigger a power-off sequence:
zThe MSM drives the PS_HOLD signal low responding to the pressing of the
keypad power button.
zBattery voltage drops below power off threshold (Battery voltage < 3.2 V).
zThe PM die temperature exceeds its “severe” over-temperature threshold.
Power Consumption and Operation Modes
Power-off Mode
In power-off mode, power (VPH_PWR) is supplied to the PM, RF PA, vibrator, and
keypad backlight LED. During this mode, the current consumption is approximately
8.8 uA.
Sleep Mode
The mobile terminal enters sleep mode only when MSM makes the request to PM
through the SBI bus. PM then enters Power Saving Mode, and the VREG_MSMC
VREG_MSMP regulators remain in power-on stage. The 32.768 kHz crystal is
enabled. TCXO buffers are off. All other functions and regulators are controlled
individually via SBI and are typically disabled for minimum power dissipation.
It exits the Sleep mode either by the expiration of a sleep clock counter in the PM or
by some external interrupt (generated by a charger connection, key press, headset
connection, etc.). The TCXO is shut down in sleep mode and the 32.768 kHz sleep
clock oscillator is used as a reference clock for the baseband.
Active Mode
In active mode, the mobile terminal operates normally. It scans channels, listens to a
base station, transmits and processes information. There are several sub-states
under the active mode. Depending on the mobile terminal’s current state, there are
states such as burst reception, burst transmission, etc.
Issue 1 04/2007 ©2007 Nokia Corporation Company Confidential Page 7

1265 (RH-103)
Baseband Description and Troubleshooting
In active mode, this is a normal operating mode for PM. VREG_MSMC,
VREG_MSMP, VREG_MSMA, VREG_RUIM, VREG_RFRX, VREG_RFTX, and
VREG_TCXO regulators are all turned on. TCXO oscillator is enabled, and TCXO
buffers are turned on. All other functions and regulators are controlled individually via
SBI.
Charging Mode
Charging mode can function in parallel with any other operating mode. A BSI resistor
inside the battery pack indicates the battery type/ size. The resistor value
corresponds to a specific battery capacity. The PM measures the battery voltage,
temperature, size, and charging current.
Charger control block inside the PM controls the charging current delivered from the
charger to the battery and mobile terminal. The maximum battery voltage is limited
by turning the PM switch off when the battery voltage reaches 4.2 V. The charging
current is monitored by measuring the voltage drop across a 0.1 ohm resistor.
Power Distribution
In normal operation, the baseband is powered by the mobile terminal‘s battery pack.
The battery pack consists of one lithium-ion cell with a capacity of 820 mAh and
safety and protection circuits.
The PM controls the power distribution to the whole mobile terminal, which includes
the baseband and the RF regulators, but excludes the RF power amplifier (RF PA)
RF power amplifier drains power from the battery directly. The battery provides
power directly to the following parts of the system:
zPM
zRF PA
zVibrator
zKeyboard & LCD backlights
The heart of the power distribution is the power control block inside the PM. It
includes all the voltage regulators and feeds the power to the entire system. The PM
handles hardware power-up functions so that the regulators are not powered on and
the power up reset (PURX) is not released if the battery voltage is less than 3 V.
Page 8 ©2007 Nokia Corporation Company Confidential Issue 1 04/2007

1265 (RH-103)
Nokia Customer Care Baseband Description and Troubleshooting
The baseband is powered by the following PM regulators:
Regulator Rating
Current Voltage Notes
MSMC 500 mA 1.2 V Always enabled except during power-off mode
MSMA 150 mA 2.65 V Enabled only when the system is powered on (Off
during sleep and power-off modes)
MSMP 300 mA 2.60 V Always enabled except during power-off mode
RUIM 150 mA 3.00 V Enabled only when RUIM card is used
TCXO 50 mA 2.85 V Enabled only when the system is powered on (Off
during sleep and power-off modes)
Note: All output regulators voltage accuracy +/-2%
Table 1: Baseband Regulators
Table 2 includes the PM regulators for the RF.
Regulator Rating
Current Voltage Notes
RFRX 150 mA 2.60 V Enabled when the receiver is on
RFTX 150 mA 2.60 V Enabled when the transmitter is on
Note: All output regulators voltage accuracy +/-2%
Table 2: RF Regulators
Clock Distribution
The QSC6010 derives its internal clock from two clock inputs, TCXO and
SLEEP_CLK.
The main clock signal for the baseband generates from TCXO
(Temperature-compensated crystal oscillator). The QSC6010’s TCXO clock input
supports the frequency 19.2 MHz +/-2ppm. The SLEEP_CLK provides a 32.768 kHz
+/-20ppm clock source to drive the MSM controller into sleep mode. At this mode,
most of the MSM is powered down and the TCXO is disabled.
Issue 1 04/2007 ©2007 Nokia Corporation Company Confidential Page 9

1265 (RH-103)
Baseband Description and Troubleshooting
System Clocks
The PM includes several clock circuits (Figure 4), whose outputs are used for
general housekeeping, MSM and RF functions within the mobile terminal system.
Figure 4: TCXO & SLEEP_XTAL Block Diagram
Page 10 ©2007 Nokia Corporation Company Confidential Issue 1 04/2007