Nokia RM307, 2505 Baseband Description and Troubleshooting

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Nokia Customer Care

2505 (RM-307)

Mobile Terminal

Baseband Description and

Troubleshooting

2505 (RM-307) 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 ................................................................................................... 20

Troubleshooting...................................................................................................... 22

Mobile Terminal is Dead...............................................................................23

Flash Faults .................................................................................................24

Power Does Not Stay ON or the Mobile Terminal is Jammed ......................25

Charger Faults .............................................................................................26

Audio Faults.................................................................................................27

Display Faults ..............................................................................................31

Keypad Faults..............................................................................................32

Keypad Faults..............................................................................................33

2505 (RM-307)

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

●64Mb 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-4B (700 mAh) lithium-ion battery is used as the main power source.

2505 (RM-307) Baseband Description and Troubleshooting

Baseband and Power Management Architecture

Figure 1: Baseband Diagram

Figure 2: Power Management of QSC6010

2505 (RM-307)

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:

z Pressing the Power button, which means to ground the KPD_PWR_N

(“PHONE_ON_N” pin in 2505 schematic) pin of the QSC6010

z Connecting 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 2505

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 2505 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.

2505 (RM-307) 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 2505 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

2505 (RM-307)

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:

The MSM drives the PS_HOLD signal low responding to the pressing of the

keypad power button.

z Battery voltage drops below power off threshold (Battery voltage < 3.2 V).

z The 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.

2505 (RM-307) 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:

z PM

z RF PA

z Vibrator

z Keyboard , Electric torch light& 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.

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

The baseband is powered by the following PM regulators:

Regulator

MSMC 500 mA 1.2 V Always enabled except during power-off mode

MSMA 150 mA 2.60 V

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

Note: All output regulators voltage accuracy +/-2%

Table 2 includes the PM regulators for the RF.

Regulator

RFRX 150 mA 2.60 V Enabled when the receiver is on

Rating

Current

Rating

Current

Voltage Notes

Enabled only when the system is powered on (Off during sleep and power-off modes)

Table 1: Baseband Regulators

Voltage Notes

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.

2505 (RM-307) 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

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

TCXO

The MSM device integrates a phase-locked loop from the TCXO clock input.

The PM optimizes TCXO operation that enables and disables appropriate circuits in

the proper sequence. The controller is enabled by the signal from the MSM.

When the selected transition occurs at TCXO_EN, the controller quickly enables the

TCXO regulator and the input buffer, and begins counting SLEEP_CLK pulses.

Within an initial power on period, the TCXO will be stabilized to its own calibrated

frequency. This initial period, in units of 32.768 kHz clock pulses, is programmed into

a timer within the controller. When the timer expires, the output buffer is enabled. It

synchronizes with the TCXO input such that the TCXO_OUT signal is glitch free,

only valid TCXO pulses are output.

Figure 5: TCXO Enable Timing Diagram

The input buffer (TCXO_IN) accepts sinusoidal or square wave signals at or near

19.2 MHz. The input buffer (TCXO_IN) is powered from the TCXO regulator while

the output buffer is powered by VREG_MSMP.

The regulator of TCXO is turned off after the TCXO_EN signal is removed. Upon

power-up, the PM defaults to this SBI-controlled mode with the TCXO defaulted on.

This assures the MSM will always have a clock available immediately at power-up

even if TCXO_EN is low.

TCXO waveform (19.2MHz +/-2ppm)

2505 (RM-307) Baseband Description and Troubleshooting

Figure 6: TCXO Timing at 25

SLEEP Crystal Circuit for 32.768 kHz

The 32.768 kHz crystal oscillator is the primary SLEEP clock source when TCXO

clocks are disabled to save power.

Figure 7: Sleep CLK Block Diagram

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

The 32.768 kHz crystal oscillator signal is generated by an external crystal (plus two

shunt capacitors), which is supplemented by a PM internal inverter and buffer.

The crystal oscillator continues to run as long as a valid supply is present, even

when the PM is powered down. This provides a continuous and accurate 32.768 kHz

source. The oscillator halts when power from the external supply and main battery

are removed.

The PM includes a circuit that continually monitors the crystal oscillator signal. If the

crystal stops oscillating, the PM automatically switches to the RC oscillator and

sends an MSM interrupt. Narrow pulses at the SLEEP_CLK output may occur during

this switchover. The crystal oscillator dissipates little power, adjusting its bias current

to the minimum required to maintain oscillation.

SLEEP Clock waveform (32.768KHz +/-20ppm)

Figure 8: Sleep_CLK Timing at 25P

2505 (RM-307) Baseband Description and Troubleshooting

SBI CLK Interface

A 9.6 MHz clock signal is used for DBUS, which is used by the MSM to transfer data

between the PM and MSM.

Figure 9: MSM to PM SBI Timing at 25P

The system clock is stopped during sleep mode by disabling the VREG_TCXO.

The TCXO is turned off by the PM regulator, which is from MSM’s TCXO_EN output

signal.

Flash Programming Error Description

This table describes the errors condition during Flash memory downloading to the

mobile terminal.

Description Not Working Properly

Packet Checksum fail ERR: CRC invalid Erase fail Unable to erase device Write fail Write unsuccessfully

Figure 10: Flash Programming Error Description

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

Charging Operation

Battery

The 2505 uses a Lithium-Ion cell battery with a capacity of 700 mAh. QSC6010

reads the resistor inside the battery pack on the BSI line to identify the battery size.

Different charging algorithm will be used for different battery sizes. The resistors are

connected to the BSI pin inside the battery connector.

Figure 11: BL-4B battery pack pin order

Charging Circuitry

The PM charge control is dependent on the charger type and the battery size.

External components are needed for electromagnetic compatibility (EMC), and

transient protection of the input to the baseband module. The charger’s DC input is

through the dc-jack connector. This mobile terminal supports AC-3/AC-4 & DC-4

chargers.

Figure 12: Charging Circuitry

2505 (RM-307) Baseband Description and Troubleshooting

Charger Detection

Connecting a charger creates a voltage on the VCHG (“VEXT_DC” pin in 2505

schematic) input of the PM. Charging starts when the PM detects the VCHG input

voltage level above 3.3V (Min. working voltage of VCHG pin).

The VCHG signal of PM is generated to indicate the presence of the charger for the

software. The power management (PM) software controls the charger identification/

acceptance. The charger recognition is initiated when the EM software receives

a ”charger connected” interrupt. The algorithm basically consists of the following

three steps:

1. Check that the system current (the collector current of PNP transistor) is within

safety limits.

2. Check the power consumption of PNP transistor is within safety limits.

3. Check that the charger is within the charger window (voltage and current). If the

charger is accepted and identified, the appropriate charging algorithm will be

initiated.

Figure 13: Mobile terminal DC Jack Circuit.

Figure 14: PNP Charging Control Circuit.

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

Charge Control

In active mode, charging is controlled by the PM’s digital part. Charging voltage and

current monitoring are used to limit charging into a safe area. The PM has a

MaxPower protection limit at NPN transistor to cut-off charger.

Cut Off MaxPower = 1000mW

The PM limits the charging voltage to MaxVoltage.

MaxVoltage= 4.25V

The PM limits the total system current (the collector current of PNP transistor) by

limiting the maximum power of NPN transistor charge.

Audio

The audio control and processing is provided by the MSM which contains the audio

codec, the MCU and DSP blocks. These blocks handle and process the audio data

signals. The baseband supports 2 microphone inputs and three receiver (earpiece)/

speaker outputs.

MIC+ & MIC- inputs of 2505 schematic are used for the mobile terminal's internal

microphone. JACK_MIC+ & JACK_MIC- input are used for headsets.

Every microphone input can have either a differential or single-ended AC connection

to the QSC6010 circuit. The internal microphone (MIC+) and external headset

microphone (JACK_MIC) are both differential signals which come from different

sources and are connected to separate inputs at the QSC6010.

The MICBIAS output is used for MIC to provide 1 mA of current at 1.8 +/-0.11Volts

DC.

VDD_MSMP (2.8V) regulated voltage from PM is used for JACK_MIC (external

headset).

RECEIVER+ & RECEIVER- (of QSC6010 output pins) outputs are used for the

mobile terminal's internal receiver (earpiece).

The receiver and external louder speaker are both differential signals that come from

separate outputs at the QSC6010 are connected to different driver.

2505 (RM-307) Baseband Description and Troubleshooting

The output power for the differential (RECEIVER) output is typically 35 mW for a

full-scale +3 dBm0 sine wave into a 32 ohm receiver.

The output power for the single-ended (MICROPHONE) output is typically 8.8 mW

for a full-scale +3 dBm0 sine wave into a 32 ohm receiver (earpiece).

The output power for the auxiliary (SPEAKER) output is typically 0.5 mW for a

full-scale +3 dBm0 sine wave into a 600 OHM load.

The 2505 also supports a hands-free speaker.

Display and Keyboard

The mobile terminal uses light-emitting diodes (LEDs) for liquid crystal display (LCD)

and keypad illumination. There is only one white LED for the LCD and the keypad.

VPH_PWR is the signal used to drive this LED driver for the LCD and keyboard.

The mobile terminal uses a color LCD. The interface uses a parallel bus to transfer

the Command/ Data between QSC6010 and LCD.

The panel for 2505 is a 96x65dot matrix FSTN LCD module. It has a FSTN panel

composed of 96 segments and 65 commons. The LCD interface uses parallel bus for

controlled Command/ Data .

Accessories

The 2505 supports the following accessories.

Figure 15: Pop-port bottom connector pin out

The pin out on the 2505 connector is as follows:

• DC Charger Input Æ Blue

• Headset Jack Input Æ Green

You can perform the following in 2505 accessories:

• Charging

• Audio interface headset microphone and receiver (earpiece)

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

Charging

This mobile terminal supports AC-3/AC-4 & DC-4 chargers and be connected

through this interface.

Headset Detection

The mobile terminal supports Nokia standard 2.5mm mono headset. The headset

insertion to the mobile terminal is detected through pin 4 (HS_DET) of the headset

Jack, J580. HS_DET (“JACK_SENSE” pin in 2505 schematic) is low when headset

not inserted. It becomes high when headset is inserted.

Figure 16: Headset Detection Circuit

RUIM CARD

This mobile terminal supports RUIM Card function. Figure 17 shows the timing of

the RUIM’s serial interface.

Figure 17: RUIM Card Serial Timing

2505 (RM-307) Baseband Description and Troubleshooting

Test Points – Top

VPH_PWR

AUDIO_OUT_P

AUDIO_OUT_N

VIB_DRV_N VPH_PWR

HPH_L

USB_D+

USB_D-

USB_VBS

PHONE_ON MSM_UART1_TX

MSM_UART1_RXD

VEXT_DC

JACK_MIC+

VPH_PWR

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

ROM_CS_N PA_ ON

GPI053 PA _VMO D

BATT_ID

CAM_FLASH

VREG_MSMC_S

MIC-

Issue 1 04/2007

BATT_ID

MIC+

2505 (RM-307) Baseband Description and Troubleshooting

Troubleshooting

First, carry out a through visual check of the module. Make sure in particular that:

• There is no mechanical damage.

• Soldered joints are OK.

• ASIC orientations are OK.

The following hints should help find the cause of the problem when the circuitry seems to be faulty. Troubleshooting instructions are divided into the following sections:

• "Mobile Terminal is Dead"

• "Flash Faults"

• "Power Does Not Stay ON or the Mobile Terminal is Jammed"

• "Charger Faults"

• "Audio Faults"

• "Display Faults"

• "Keypad Faults"

Note:

• QSC6010 is underfilled and can not be replaced.

• Memory IC is underfilled and can not be replaced.

• The Shielding Cover can not be reused after removal.

• After using the heat gun, the domesheet needs to be replaced.

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

Mobile Terminal is Dead

Mobile

Terminal is

Dead

♦ If current is zero, check L208, Q209, R214

and check the power on sequence. If there is no power output, Reheat solder joints or change

Is the mobile

terminal current is

zero or too high?

YES

♦ Make sure all BB regulators are at their respective

voltage levels (VREG_MSMA, VREG_MSMP, VREG_MSMC, VREG_TCXO). Reheat solder joints / change if necessary.

Is the current

< 60 mA?

YES

Check RESIN_N

signals. Is it high

(2.8V)?

YES

Check PS_HOLD

signals. Is it high

(2.9V)?

YES

Check the “BSI” line at

J202, C225, R224.

Are they OK?

YES

Reheat solder joints or change QSC6010

Is flash

programming OK?

YES

Reheat solder joints

change

MSM is defective, phone can not be

repaired and must

be replaced.

Flash

Faults

Mobile

Terminal is

Jammed

Check ROM_CS_N

(TP56). Is it toggling

after RESIN_N goes

high?

YES

Memory IC is

defective, phone can

not be repaired and

must be replaced.

MSM is defective, phone

can not be repaired and

must be replaced.

Issue 1 04/2007 kia Corporation Compa

2505 (RM-307)

Baseband Description and Troubleshooting

Flash Faults

Flash

Faults

Measure 19.2MHz

RF CLK at testpoint.

YES

Can the mobile

terminal connect to

PC via UART?

YES

Check ROM_CS_N

(TP56) and WR_N

(R453). Are they

toggling during

programming?

Measure the

19.2MHz CLK

coming from the

MSM is defective, phone can

not be repaired and must be

replaced.

Memory IC is

defective, phone can

not be repaired and

must be replaced.

Is it work?

END

MSM is defective, phone can not be

repaired and must

be replaced.

Check/ change

VREG_TCXO, Y104

Mobile

Terminal is

Jammed

YES

Memory IC is

defective, phone can

not be repaired and

must be replaced.

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

Power Does Not Stay ON or the Mobile Terminal is Jammed

Mobile

Terminal

Measure VREG_MSMP,

VREG_MSMC,

VREG_MSMA, and

VREG_TCXO voltages.

Are they OK?

YES

Measure 32kHz Sleep

CLK , Is it OK?

YES

Check VPH_PWR, VREG_MSMP,

VREG_MSMC, VREG_MSMA,

and VREG_TCXO capacitors.

Are they OK?

YES

Check “BSI” line

and VPH_PWR line.

Measure the 32 kHz

Reheat solder joints or

e QSC6010

chan

solder joints/ change

TCXO and QSC6010

Reheat solder

Repair capacitors, reheat

joints or

change

QSC6010

hange Y103

Measure 19.2MHz RF CLK. Is it OK?

YES

Measure RESIN_N.

Is it high (2.8V)?

YES

MSM is defective, phone can not be

repaired and must

be replaced.

Measure the

19.2MHz CLK

coming from the

MSM is defective, phone can not be

repaired and must

be replaced.

Reheat solder joints

or chan

e QSC6010

Nokia Corporation Compa

Check/ reheat solder

joints/ change

VREG_TCXO, Y104

ny Confidential Page 25

2505 (RM-307)

Baseband Description and Troubleshooting

Charger Faults

Charge

Faults

Connect the charger

and make sure the

battery is

connected.

Check the “BSI” line.

Is it about 75k Ohm or

81k Ohm?

YES

Measure voltage

at D205.

Is it >4.5V?

YES

Read MOBILE

TERMINAL_THERM

value. Is it room

temperature?

YES YES

Check/ changeJ202,

C225, R224.

Check/ change DC Jack,

NO NO

L208, D205, C206, R212,

C210 and Q209.

Check RT228 and

R227.

re they OK?

MSM is defective, phone

can not be repaired and

must be replaced.

Replace NTC

or R227

Measure voltage

between pin#1 and pin#3

Change QSC6010

of Q209. Is it >0.7V

YES

Change Q209

Nokia Corporation Compan Co

y nfidential Issue 1 04/2007

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

Audio Faults

Audio

Faults 1

Is the onboard

receiver working?

YES

Replace the

receiver

(earpiece). Is it

working now?

Use CCS Service

Software

Audio/Vibra

TestingÆStereo

ReceiverÆ Mobile

terminal Receiver Loop Back

Test command

Is the signal coming out of the MSM

on RECEIVER+ and RECEIVER- ?

YES

Retest

Change the

receiver

(earpiece).

Audio Faults

Page 2

Check/ change C509, C510,

c545. If OK, MSM is

defective, phone can not be

repaired and must be

replaced.

2505 (RM-307)

Baseband Description and Troubleshooting

Audio

Faults 2

Is onboard

microphone

working?

YES

Replace the

microphone. Is it

workin

now?

Use CCS Software

Testing

Stereo Audio/Vibra

MicrophoneÆMobile terminal Microphone Test command

Measure MICBIAS voltage from MIC+

pads. Is it 1.6V~ 1.95V?

YES

Is the signal going to the MSM at

MIC1+ and MIC- at C541?

YES

Retest

change

Check R538,C573. If OK, MSM is defective, phone can not be

repaired and must be

replaced.

Check/ change

C571, C572, R542.

If OK, MSM is

defective, phone can

not be repaired and

must be replaced.

Audio

Retest

Faults

Page 3

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

Audio

Faults 3

Is the internal

handsfree speaker

(IHF) working?

YES

Select a ring tone and

measure signals at

L577 and L578. Are the

signals OK?

Measure SPK_N.

Is it OK (2.9V+/-2%)?

YES

Use CCS SoftwareÆTesting

Stereo Audio/Vibra

SpeakerÆMobile terminal

Speaker control Test command

YES

Chan

e IHF

MSM is defective,

phone can not be

repaired and must

be replaced.

Check/ change C505,C506 ,

If OK, MSM is defective,

phone can not be repaired

and must be replaced.

Audio

Faults

Page 4

2505 (RM-307)

Baseband Description and Troubleshooting

Audio

Faults 4

Is the vibrator

working?

YES

Measure

NO NO

voltage on the

PH_PWR

vibrator. Is it OK?

YES

Use CCS SoftwareÆTestingÆ

Stereo Audio / Vibra

Vibrator Control Test

Command

vibrator should

work.

SYE

Reheat solder joints/ change

battery, CR405,

C408

Check

VPH_PWR

line. Is it OK?

YES

END

Measure the

VIB_DRV_N

signal on the

vibrator. Is the

signal OK?

YES

Change the vibrato

Change the

QSC6010,CR405, C409

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

Display Faults

2505 (RM-307) Baseband Description and Troubleshooting

Display

Faults Page2

Does the display start?

YES

Check U430 pin signals, are

they OK?

YES

Check LCD supply voltage at

J410 pin6. Is it okay?

YES

Check LCD signals: LCM_CS_N(J410_pin5), LCM_OE_N(J410_pin4), LCM_WE_N(J410_pin3),

LCM_RS(J410_pin2). Are the

signals okay?

Chang any bad

component

Check R455,R456,

R457,R458, are

they ok?

YES

Change QSC6010

Phone can not be

repaired and must

be replaced

Change LCD

Module

END

YES

RESET

2505 (RM-307)

Nokia Customer Care Baseband Description and Troubleshooting

Keypad Faults

Keypad

Faults

Is the power

key working?

YES

Keypad

Faults

Page 2

Measure voltage at

NO NO

Sw9 PIN2 (2.95V).

Is it high?

YES

Measure voltage at SW9 when power key is pressed. Is it Low?

Change QSC6010

YES

Change QSC6010

Retest

2505 (RM-307) Baseband Description and Troubleshooting

Keypad

Faults

Page 2

Are the UI module

keys working?

YES

END

Measure KEYSENSE(0~4)_N

signals between QSC6010

and keypad at every outer

dome key. Are they 2.9V

+/-0.1V?

YES

Measure

KYPD_(9,11,15,13,17)

signals between

QSC6010 and keypad on

every inner dome Key.

Are they about 0V?

YES

QSC6010 is

defective, phone

can not be repaired

and must be

replace

Make sure there are no shorts

on KEYSENSE(0~4)_N. If OK, QSC6010 is defective, phone

cab not be repaired and must

be replaced. Otherwise, remove

Make sure there are no

shorts on

KYPD_(9,11,15,13,17). If OK,

QSC6010 is defective,

phone can not be repaired

and must be replaced.

Otherwise, remove the short

Nokia RM307, 2505 Baseband Description and Troubleshooting

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents Page

Baseband and Power Management Architecture

Power Up and Reset

Power Up

Power Key

Charger

External Supply Source is Detected

Power Off

Power Consumption and Operation Modes

Power-off Mode

Sleep Mode

Active Mode

Charging Mode

Power Distribution

Clock Distribution

System Clocks

TCXO

SLEEP Crystal Circuit for 32.768 kHz

SBI CLK Interface

Flash Programming Error Description

Charging Operation

Battery

Charging Circuitry

Charger Detection

Charge Control

Audio

Display and Keyboard

Accessories

Charging

Headset Detection

RUIM CARD

Test Points – Top

Troubleshooting

Mobile Terminal is Dead

Flash Faults

Power Does Not Stay ON or the Mobile Terminal is Jammed

Charger Faults

Audio Faults

Display Faults