Nokia 6585 Service Manual 8rh34bb

CCS Technical Documentation

RH-34 Series Transceivers

Troubleshooting - Baseband

RH-34

Troubleshooting - Baseband CCS Technical Documentation

Contents

Page No

Troubleshooting Overview ............................................................................................ 4

Power Up and Reset .....................................................................................................6

Power up with PWR key........................................................................................... 8

Power up when charger is connected........................................................................ 8

RTC alarm power up................................................................................................. 9

Power Off .....................................................................................................................9

Power Consumption and Operation Modes .................................................................9

Power .........................................................................................................................10

Clock Distribution .....................................................................................................11

RFClk (19.2 MHz Analog)...................................................................................... 11

RFConvClk (19.2 MHz digital) .............................................................................. 12

CBUSClk Interface ................................................................................................. 13

DBUS Clk Interface................................................................................................ 13

SleepCLK (Digital)................................................................................................. 14

SleepCLK (Analog)................................................................................................. 14

Flash Programming ....................................................................................................15

Connections to Baseband ........................................................................................ 15

Baseband Power Up................................................................................................ 15

Flash Programming Indication................................................................................ 15

Flashing................................................................................................................... 16

Charging Operation ...................................................................................................17

Battery..................................................................................................................... 17

Charging circuitry ................................................................................................... 18

Charger Detection ......................................................................................................19

Charge Control........................................................................................................ 20

Audio .........................................................................................................................20

Display and Keyboard ...............................................................................................21

FM Radio ...................................................................................................................21

FM Radio Test......................................................................................................... 23

Accessory ...................................................................................................................25

Charging.................................................................................................................. 26

Tomahawk headset detection.................................................................................. 27

FBus detection......................................................................................................... 28

Accessory detection though ACI............................................................................. 29

RUIM (SIM CAR) .....................................................................................................30

Test Points .................................................................................................................31

Top troubleshooting map ...........................................................................................34

Phone is totally dead ..................................................................................................36

Flash programming doesn’t work ..............................................................................37

Phone is jammed ........................................................................................................39

Power doesn’t stay on or the phone is jammed .........................................................40

Charger faults .............................................................................................................41

Audio faults ...............................................................................................................42

Earpiece................................................................................................................... 42

Microphone ............................................................................................................. 43

Vibra........................................................................................................................ 44

Display faults .............................................................................................................45

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CCS Technical Documentation Troubleshooting - Baseband

Keypad faults .............................................................................................................47

Power key................................................................................................................ 47

UI modules.............................................................................................................. 48

FM Radio................................................................................................................. 49

GPS Module ...............................................................................................................50

Overview................................................................................................................. 50

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Troubleshooting - Baseband CCS Technical Documentation

Troubleshooting Overview

The Baseband module of the RH-34 transceiver is a trimode CDMA dual band engine. The Baseband architecture is based on the DCT4 Apollo engine.

RH-34 Baseband consists of three main ASIC's: Universal Energy Management (UEM), Universal Phone Processor (UPP), and a 128-Megabit FLASH.

The Baseband architecture supports a power-saving function called "sleep mode". This sleep mode shuts off the VCTCXO, which is used as system clock source for both RF and Baseband. During the sleep mode, the system runs from a 32 kHz crystal. The phone awakes by a timer running from this 32 kHz clock. The sleep time is determined by network parameters. Sleep mode is entered when both the MCU and the DSP are in standby mode and the 19.2MHz Clk (VCTCXO) is switched off.

RH-34 supports both two and three DCT3 type wire chargers. However, the three-wire chargers are treated as two-type wire chargers. Charging is controlled by UEM ASIC and EM SW.

BLD-3 Li-ion battery is used as main power source for RH-34. BLD-3 has nominal capacity of 780 mAh.

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CCS Technical Documentation Troubleshooting - Baseband

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Troubleshooting - Baseband CCS Technical Documentation

Power Up and Reset

Power up and reset is controlled by the UEM ASIC. RH-34 baseband can be powered up in the following ways:

1 By the Power button, which means grounding the PWRONX pin of the UEM

2 By connecting the charger to the charger input

3 By the RTC Alarm, when the RTC logic has been programmed to give an alarm

After receiving one of the above signals, the UEM counts a 20ms delay and then enters in reset mode. The watchdog starts up, and if the battery voltage is greater than Vcoff+, a 200ms delay is started to allow references, etc. to settle. After this delay elapses, the VFLASH1 regulator is enabled. Then, 500us later VR3, VANA, VIO, and VCORE are enabled. Finally, the PURX (Power Up Reset) line is held low for 20 ms. This reset, PURX, is fed to the baseband ASIC UPP; resets are generated for the MCU and the DSP. During this reset phase, the UEM forces the VCTCXO regulator on — regardless of the status of the sleep control input signal — to the UEM. The FLSRSTx from the ASIC is used to reset the flash during power up and to put the flash in power down during sleep. All baseband regulators are switched on when the UEM powers on. The UEM internal watchdogs are running during the UEM reset state, with the longest watchdog time selected. If the watchdog expires, the UEM returns to power-off state. The UEM watchdogs are internally acknowledged at the rising edge of the PURX signal in order to always give the same watchdog response time to the MCU.

The following diagram represents UEM start-up sequence from reset to power-on mode.

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CCS Technical Documentation Troubleshooting - Baseband

Reference signal

PwrOnX

Charger Detection

RTC

UEMRSTX

VFlash1

VIO

VCORE

VANA

VR3

19.2MHz Clk

PURX

32kHz XTAL

t1 t2 t4t3

t1 = 20ms

t2 = 200ms

t3 = 500us

t4 = 20ms

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Troubleshooting - Baseband CCS Technical Documentation

Power up with PWR key

When the Power on key is pressed, the UEM enters the power up sequence. Pressing the power key causes the PWRONX pin on the UEM to be grounded. The UEM PWRONX signal is not part of the keypad matrix. The power key is only connected to the UEM. This means that when pressing the power key, an interrupt is generated to the UPP that starts the MCU. The MCU then reads the UEM interrupt register and notices that it is a PWRONX interrupt. The MCU now reads the status of the PWRONX signal using the UEM control bus, CBUS. If the PWRONX signal stays low for a certain time, the MCU accepts this as a valid power on state and continues with the SW initialization of the baseband. If the power on key does not indicate a valid power on situation the MCU powers off the baseband.

Power up when charger is connected

In order to be able to detect and start charging in the case where the main battery is fully discharged (empty) and hence UEM has no supply (NO_SUPPLY or BACKUP mode of UEM), charging is controlled by START-UP CHARGING circuitry.

Whenever VBAT level is detected to be below master reset threshold (VMSTR-), charging starts and is controlled by START_UP charge circuitry. Connecting a charger forces VCHAR input to rise above the charger detection threshold, VCHDET+, and by detection charging is started. UEM generates 100mA constant output current from the connected charger's output voltage. As battery charges, its voltage rises and when VBAT voltage level is detected to be higher than the master reset threshold limit (VMSTR+), START_UP charge is terminated.

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CCS Technical Documentation Troubleshooting - Baseband

Monitoring the VBAT voltage level is done by charge control block (CHACON). MSTRX='1' output reset signal (internal to UEM) is given to UEM's RESET block when VBAT>VMSTR+ and UEM enters into reset sequence.

If VBAT is detected to fall below VMSTR- during start-up charging, charging is cancelled. It will restart if new rising edge on VCHAR input is detected (VCHAR rising above VCHDET+).

RTC alarm power up

If phone is in POWER_OFF mode when RTC alarm occurs, a wake-up procedure occurs. After baseband is powered ON, an interrupt is given to MCU. When RTC alarm occurs during ACTIVE mode, an interrupt to MCU is generated.

Power Off

The Baseband switches into power off mode if any of following statements is true

• Power key is pressed

• Battery voltage is too low (VBATT < 3.2 V)

• Or if Watchdog timer register expires

The Power down procedure is controlled by the UEM.

Power Consumption and Operation Modes

During power off mode, power (VBAT) is supplied to UEM, BUZZER, VIBRA, LED, PA and PA drivers (Tomcat and Hornet). During this mode, the current consumption on this mode is approximately 35uA. This is the UEM leakage current.

In sleep mode, both processors, MCU and DSP, are in stand-by mode. Phone will go to sleep mode only when by both processors made this request. When SLEEPX signal is detected low by the UEM, the phone enters SLEEP mode. VIO and VFLASH1 regulators are put into low quiescent current mode, VCORE enters LDO mode and VANA and VFLASH2 regulators are disabled. All RF regulators are disabled during SLEEP mode. When SLEEPX signal is detected high by the UEM, the phone enters ACTIVE mode and all functions are activated.

The sleep mode is exited either by the expiration of a sleep clock counter in the UEM or by some external interrupt, generated by a charger connection, key press, headset connection etc.

In sleep mode, the VCTCXO (19.2MHz Clk) is shut down and the 32 kHz sleep clock oscillator is used as reference clock for the baseband.

The average current consumption of the phone can vary depending mainly on SW state like slot cycle 0, 1, or 2 and if the phone is working on IS95 or IS2000 for CDMA; however, on average is about 6 mA in slot cycle 0 on IS95.

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Troubleshooting - Baseband CCS Technical Documentation

In the ACTIVE mode, the phone is in normal operation, scanning for channels, listening to a base station, transmitting and processing information. There are several sub-states in the active mode depending on the phone present state such as: burst reception, burst transmission, if DSP is working etc.

In active mode, SW controls the UEM RF regulators: VR1A and VR1B can be enabled or disabled. These regulators work of the UEM charge pump. VSIM can be enabled or disabled and its output voltage can be programmed to be 1.8V or 3.3V. VR2 and VR4 -VR7 can be enabled or disabled or forced into low quiescent current mode. VR3 is always enabled in active mode and disabled during Sleep mode and cannot be control by SW in the same way as the other regulators. VR3 will only turn off if both processors (DSP and MCU) request to be in sleep mode.

CHARGING mode can be performed in parallel with any other operating mode. A BSI resistor inside the battery indicates the battery type/size. The resistor value corresponds to a specific battery type and capacity. This capacity value is related to the battery technology.

Power

The battery voltage, temperature, size and charging current are measured by the UEM, and the EM charging algorithm controls it.

The charging control circuitry (CHACON) inside the UEM controls the charging current delivered from the charger to the battery. The battery voltage rise is limited by turning the UEM switch off, when the battery voltage has reached 4.2 V. Charging current is monitored by measuring the voltage drop across a 220 mOhm resistor.

In normal operation, the baseband is powered from the phone's battery. The battery consists of one Lithium-Ion cell. In the case of Lancelot, the battery capacity is 850 mAh.

The UEM ASIC controls the power distribution to whole phone through the BB and RF regulators excluding the power amplifier (PA) and the DC/DC, which have a continuous power rail directly from the battery. The battery feeds power directly to following parts of the system: UEM, PA, DC/DC, buzzer, Vibra, display- and keyboard lights.

The heart of the power distribution to the phone is the power control ASIC, called UEM. It includes all the voltage regulators and feeds power to the whole system. UEM handles hardware functions of power up so that regulators are not powered and power up reset (PURX) is not released if the battery voltage is less than 2.8 V.

RH-34 Baseband is powered from five different UEM regulators: VANA, VIO, VFLASH1, VFLASH2, and VCORE DC/DC. See Table 1.

UEM voltage regulators: VR1A, VR1B, VR2, VR3, VR4, VR5, VR6 and VR7 are used by RF. See Table 2.

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CCS Technical Documentation Troubleshooting - Baseband

Table 1: RH-34 Baseband Regulators

Maximum

Regulator

current (mA)

Vout (V) Notes

VCORE DD/DC

VIO 150 1.8 Enabled always except during power-off mode

VFLASH1 70 2.78 Enabled always except during power-off mode

VFLASH2 40 2.78 Enabled only when data cable is connected

VANA 80 2.78 Enabled only when the system is awake (off during sleep and

VSIM 25 3.0

Regulator

VR1A 10 4.75 Enabled when the receiver is on

VR1B 10 4.75 Enabled when the transmitter is on

VR2 100 2.78 Enabled when the transmitter is on

300 1.5 Output voltage selectable 1.0V/1.3V/1.5V/1.8V

Default power at power-up is 1.5V

power-off modes)

Table 2: RH-34 RF Regulators

Maximum current (mA)

Vout (V) Notes

VR3 20 2.78 Enabled when SleepX is high

VR4 50 2.78 Enabled when the receiver is on

VR5 50 2.78 Enabled when the receiver is on

VR6 50 2.78 Enabled when the transmitter is on

VR7 45 2.78 Enabled when the receiver is on

A charge pump used by VR1A is constructed around UEM. The charge pump works with Cbus (1.2 MHz Clk) and gives a 4.75 V regulated output voltage to RF.

Clock Distribution

RFClk (19.2 MHz Analog)

The main clock signal for the baseband is generated from the voltage and temperature controlled crystal oscillator VCTCXO (G503). This 19.2 MHz clock signal is generated at the RF and fed to RFCLK pin of UPP.

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Troubleshooting - Baseband CCS Technical Documentation

RFConvClk (19.2 MHz digital)

The UPP distributes the 19.2 MHz Clk to the internal processors, the DSP, and MCU, where SW multiplies this clock by seven for the DSP and by two for the MCU.

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CCS Technical Documentation Troubleshooting - Baseband

CBUSClk Interface

A 1.2 MHz clock signal is used for CBUS, which is used by the MCU to transfer data between UEM and UPP.

DBUS Clk Interface

A 9.6 MHz clock signal is used for DBUS, which is used by the DSP to transfer data between UEM and UPP.

The system clock can stopped during sleep mode by disabling the VCTCXO power supply from the UEM regulator output (VR3) by turning off the controlled output signal SleepX from UPP.

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Troubleshooting - Baseband CCS Technical Documentation

SleepCLK (Digital)

The UEM provides a 32kHz sleep clock for internal use and to UPP, where it is used for the sleep mode timing.

SleepCLK (Analog)

When the system enters sleep mode or power off mode, the external 32KHz crystal provides a reference to the UEM RTC circuit to turn on the phone during power off or sleep mode.

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CCS Technical Documentation Troubleshooting - Baseband

Flash Programming

Connections to Baseband

The Flash programming equipment is connected to the baseband using test pads for galvanic connection. The test pads are allocated in such a way that they can be accessed when the phone is assembled. The flash programming interface consist of the VPP, FBUSTX, FBUSRX, MBUS, and BSI signals and use by the FPS8 to flash. The connection is through the UEM which means that the logic voltage levels are corresponding to 2.78V. Power is supplied to the phone using the battery contacts.

Baseband Power Up

The baseband power is controller by the flash prommer in production and in re-programming situations. Applying supply voltage to the battery terminals will cause the baseband to power up. Once the baseband is powered, flash programming indication is done as described in the following section.

Flash Programming Indication

Flash programming is indicated to the UPP using MBUSRX signal between UPP and UEM. The MBUS signal from the baseband to the flash prommer is used as clock for the synchronous communication. The flash prommer keeps the MBUS line low during UPP boot to indicate that the flash prommer is connected. If the UPP MBUSRX signal is low on UPP, the MCU enters flash programming mode. In order to avoid accidental entry to the flash-programming mode, the MCU only waits for a specified time to get input data from the flash prommer. If the timer expires without any data being received, the MCU will continue the boot sequence. The MBUS signal from UEM to the external connection is used as clock during flash programming. This means that flash-programming clock is supplied to UPP on the MBUSRX signal.

The flash prommer indicates the UEM that flash programming/reprogramming by writing an 8-bit password to the UEM. The data is transmitted on the FBUSRX line and the UEM clocks the data on the FBUSRX line into a shift register. When the 8 bits have been shifted in the register, the flash prommer generates a falling edge on the BSI line. This loads the shift register content in the UEM into a compare register. If the 8-bits in the compare registers matches with the default value preset in the UEM, programming starts. At this point the flash prommer shall pull the MBUS signal to UEM low in order to indicate to the MCU that the flash prommer is connected. The UEM reset state machine performs a reset to the system, PURX low for 20 ms. The UEM flash programming mode is valid until MCU sets a bit in the UEM register that indicates the end of flash programming. Setting this bit also clears the compare register in the UEM previously loaded at the falling edge of the BSI signal. During the flash programming mode the UEM watchdogs are disabled. Setting the bit indicating end of flash programming enables and resets the UEM watchdog timer to its default value. Clearing the flash programming bit also causes the UEM to generate a reset to the UPP.

The BSI signal is used to load the value into the compare register. In order to avoid spurious loading of the register the BSI signal will be gated during UEM master reset and during power on when PURX is active. The BSI signal should not change state during normal operation unless the battery is extracted, in this case the BSI signal will be pulled high,

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Troubleshooting - Baseband CCS Technical Documentation

note a falling edge is required to load the compare register.

Flashing

Flash programming is done through VPP, FBUSTX, FBUSRX, MBUS, and BSI signals.

When phone has entered to flash programming mode, prommer will indicate to UEM that flash programming will take place by writing 8-bit password to UEM. Prommer will first set BSI to "1" and then uses FBUSRX for writing and MBUS for clocking. After that BSI is set back to "0".

MCU will indicate to prommer that it has been noticed, by using FBUSTX signal. After this it reports UPP type ID and is ready to receive secondary boot code to its internal SRAM.

FLASH_1

CH1 = BSI CH2 = MBUS CH3 = FBUSTX CH4 = FBUSRX

Measure points Production test pattern (J396)

Figure 1: Flashing start

This boot code asks MCU to report prommer phone’s configuration information, including flash device type. Now the prommer can select and send algorithm code to MCU SRAM (and SRAM/Flash self-tests can be executed)

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