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Motorola Internal Use 

          2

P7389i – Circuit Description

RF:

 Receive

1)

 

The RF Signal from the base station is received through the Antenna 

A1 

or from the

Accessory Connector

 

J600

 and is fed to 

Pin 10

 or 

Pin 3 

respectively

 

of the

 RF Switch

U150

, the switch acts as an isolation between TX and RX. The 

RF Switch control

 is

provided by 

U151

.This decides whether the Switch is opened for TX or RX and if the

RF is passed to the Aux RF port or the Antenna. This is managed by the following
signals:

TX_EN

RX_EN

SW_RF (50

Ω

 Load)

Result

H

L

Loaded

TX through J600

L

H

Loaded

RX through J600

H

L

Not Loaded

TX through Antenna

L

H

Not Loaded

RX through Antenna

2)

 

TX_EN 

and 

RX_EN

 are produced by 

Whitecap U800, 

Pins C1

 and 

E3

respectively.

U151

 is supported by the voltages 

FILTERED –5V

(From 

–5V

 (

U903

))

and 

RF_V1

(

Q201

)

3)

 

Once the received signal is present (using GSM 900 as the example) in the RF switch.
Provided 

RX275_GSM_PCS

 (

Q2101

) is high, then the received signal will be passed

to the band pass filter 

FL400

, GSM900received frequency will be filtered through,

*Note 

RX275_GSM_PCS 

also selects the PCS 1900 frequency passed through

FL2400

. The DCS 1800 frequency is selected by 

RX275_DCS

 (

Q110

) and passed

through 

FL1400

4)

 

For the PCS 1900 and DCS 1800 frequencies the signal is then fed onto the 

DCS/PCS

Select switch U400. 

The signal 

RVCO_PCS

 and 

RVCO_DCS

 (

Q1100

) will then

select the appropriate signal; with output tuning being provided by 

L1411

 and 

C1411

for DCS and 

C2411

 for PCS.

5)

 

Once selected the signal will be fed into a Low noise Amplifier Circuit, this part of
the circuit is critical in the achievement of a very low signal to noise ratio, therefore
as can be seen around the actual amplifiers 

Q400

 for GSM (supported by

RX275_GSM

 (

Q110

)) and 

Q1400

 for DCS / PCS (supported by 

RX275_DPCS

(

Q2102

)), a large amount of external frequency matching and noise reduction

circuitry is involved.

6)

 

The appropriate signal is then fed onto 

FL1401

 (For GSM 1800 / 1900) or 

FL401

(For GSM 900) where any existing harmonics or other unwanted frequencies are
removed.

Содержание TimePort P7389i

Страница 1: ...Level 3 Product Guide P7389i Level 3 Circuit Description 25 07 00 V1 0 ...

Страница 2: ...is high then the received signal will be passed to the band pass filter FL400 GSM900received frequency will be filtered through Note RX275_GSM_PCS also selects the PCS 1900 frequency passed through FL2400 The DCS 1800 frequency is selected by RX275_DCS Q110 and passed through FL1400 4 For the PCS 1900 and DCS 1800 frequencies the signal is then fed onto the DCS PCS Select switch U400 The signal RV...

Страница 3: ... be the difference signal OF 400Mhz that is now fed to the SAW Filter FL457 Surface Acoustic Wave this filter is the same as was used in previous 400MHz products The purpose of the SAW filter is to provide comprehensive removal of harmonics created during the mixing process 11 The IF signal fed to the SAW filter will be 400Mhz The reason for the change to 400Mhz from 215Mhz is to limit the span of...

Страница 4: ...0 I bits 6 zeros SDFS pulse 10 Q bits 6 zeros 16 idle bit times 18 The new SPS ROM 6 Whitecap U800 receives these signals on Pins A3 D4 and B4 within the Whitecap the signal is digitally processed Baud rate reduced Error correction bits removed deciphered and de interleaved 19 The digital signal is now being fed down the DIG_AUD_SPI bus to the GCAP II U900 internally to the GCAP the digital signal...

Страница 5: ...nsferred to the MAGIC DM DM U200 along a TX SPI bus The bus is made up of BCLKX Base band Clock Transmit Pin B3 and BDX Base band Data Transmit Pin B6 The timing for this data is already decided for the transmission burst and therefore a frame synch is not required 6 The SPI comes into the MAGIC DM at Pin G7 BCLKX and Pin J2 BDX 7 The operation of the MAGIC DM is very complex and with respect to t...

Страница 6: ...comprises mainly of U360 Q360 Q361 and C367 and it s main function is to smooth out any overshoots when the channel is changed see Fig 11 1 If this overshoot were fed to the TX VCO the resulting burst would not meet the world standards for GSM with respect to bandwidth see Fig 11 2 12 The Loop filter basically acts then as a huge capacitor and resistor to give a long CR time for smoothing It uses ...

Страница 7: ...supported by the voltage PA B DM_CS B through Q380 17 PA matching is provided using the signals TX_GSM TX275 GSM_SEL through Q1101 and TX_DCS TX275 DCS_SEL through Q1101 to switch on or off the diodes CR300 through CR306 to match the PA between GSM and DCS PCS using the inductive strips on the PCB 18 The amplified signal is then fed back to the RF switch U150 as discussed in Receive then either tr...

Страница 8: ...ases enough to cause the detector to rise a few millivolts then this output will go low In the GSM radio a resistor is routed between this point and the AOC input to cause the radio to ramp up the power until the detector goes active Logic Power Up sequence 1 Three power sources available battery External Power via Charger Battery must be present to power up 2 Battery Power Source The L7389i uses ...

Страница 9: ...sic operation V1 supplies the DSC bus drivers negative voltage regulators and MAGIC DM V1 is created from GCAP II Pin A6 and can be measured on C906 The basic circuit operation for the Boost circuit is as follows the LX signal GCAP II Pin B10 allows a path for B to charge the capacitor when the switch is on the capacitor then discharges through the inductor switch off setting up an electric field ...

Страница 10: ...sed for RF GSM DCS selection signals through Q160 Both voltages produced by V1 through U903 and U904 SR_VCC Power Cut Circuit Used to buffer the SRAM U702 voltage with a built in soft reset within the unit s software The reason for this is to protect the user from any accidental loss of power up to 0 5 seconds i e If the unit is knocked causing a slight battery contact bounce the SR_VCC will to th...

Страница 11: ...l internally be divided by 2 to give our external 13MHz clock This is then fed out of the MAGIC DM on Pin J6 MAGIC DM_13MHz and distributed to Whitecap Pin H10 CLKIN then from Whitecap Pin B7 to GCAP II Pin F5 as GCAP_CLK At the same time the 13MHz Varactor Diode CR248 is producing an output This output is controlled in the following way The 26MHz from Y200 is divided down to 200 kHz and fed to a ...

Страница 12: ...ls are Reset Whitecap Pin E9 RST0 in to GCAP II Pin K7 LS1_IN_TG1A This signal is then level shifted to the required voltage and fed out to SIM Contacts J803 Pin 4 from Pin J7 LS1_OUT_TG1A Clock This is a 3 25MHz signal from Whitecap Pin E9 CLK0 Pin E7 to GCAP II Pin G6 LS2_IN This signal is then level shifted to the required voltage and fed out to SIM Contacts J803 Pin 6 from Pin F6 LS2_OUT SIM I...

Страница 13: ...d through Q900 to BATT Logic Deep Sleep Mode Deep sleep mode is there to provide a facility to save battery life by intermittently shutting off part of the PCB This is achieved in the following way The signal STBY_DL is generated from Whitecap Pin F1 through a standby delay circuit CR912 and U906 The logic gate U906 and diode CR912 are used to provide a short delay between the time of activation o...

Страница 14: ...eric contact The LCD is controlled by CS1 Chip Select which originates from DP_EN_L Whitecap Pin A11 to J902 Pin 1 RES which originates from RESET Whitecap Pin P2 to J902 Pin 2 R W which originates from R_W Whitecap Pin P2 to J902 Pin 4 7 Data Lines from Whitecap DO D7 The display is supported by V2 and 10V originating from U904 and can be measured on C965 Also the data command signal AO from Whit...

Страница 15: ...cher is integrated to allow compatibility between the received signal and Whitecap 5 The module is supported by V2 Logic Vibrator 1 The vibrator contacts are now situated on the topside of the smart card PCB 2 The vibrator is controlled by the signal VIB_EN Whitecap Pin K1 and B through U501 3 U501 connects to the vibrator pads through Connector J5006 Pins 2 and 4 Vibrator pads ...

Страница 16: ...MHz 1805 1990MHz FILTERED_ 5V DCS_SEL 13MHz VCO Tri Band GPRS Leap CR248 PHASE DET 13MHz Divider 200KHz GSM SERVICE SUPPORT GROUP 18 07 00 LEVEL 3 AL Block Diagram Rev 1 0 Tri Band GPRS Leap Michael Hansen Ray Collins Ralf Lorenzen Page 1 Pin2 FL2400 5 1 3 5 U400 1930 1990MHz RVCO_DCS RVCO_PCS 6 4 RX275_GSM STEP ATT DEMODULATION SPI RX F7 G9 G8 RXI RXQ J6 MUX G6 PA CONTROL A9 D9 PLL SWITCH H7 C8 C...

Страница 17: ...LOCK Y900 A7 B7 32 768 KHz SPR SPR ALRTOUT ALRT_VCC REG V2 REG V3 REG VBOOST1 REG L901 B V_BOOST1 V1 V2 V3 VREF REG VREF 2 775V for WhiteCap logic outputs RAM FLASH EEPROM 1 8V for WhiteCap VSIM REG VSIM1 V1 5 0V for DSC Bus Negative Voltage Regulator Internal GCap use only VSIM1 LS_V1 3 0 or 5 0V for SIM Card Circuit PA_DRV RESET 2 775V for Magic K6 E18 B10 J5 C6 B5 G9 A6 A10 C10 C7 BATT EXT_B 14...

Страница 18: ...SH7 GPRS LEAP_8485776K10_P10 1 GSM SERVICE SUPPORT GROUP 22 06 00 Level 3 Layout Rev 1 0 GPRS LEAP 8485776k10_ P10 1 Michael Hansen Ralf Lorenzen Ray Collins Page 1 of 2 REVISIONS J902 SH6 SH5 SH4 ...

Страница 19: ...GSM SERVICE SUPPORT GROUP 22 06 00 Level 3 Layout Rev 1 0 GPRS LEAP 8485776k10_ P10 1 Michael Hansen Ralf Lorenzen Ray Collins Page 1 of 2 REVISIONS GPRS LEAP_8485776K10_P10 1 SH1 SH2 SH3 SH8 ...

Страница 20: ...d at correct level for the right value compare them with a good pcb Does key pad works ok Go to NO KEYPAD pag 23 NO YES YES Does radio power up and stay on using battery If the radio power up only from EXT conn Supply GO TO NO POWER UP BATTERY on pag 20 otherwise GO TO NO POWER UP on pag 13 NO Does PCB draw current when is off Go to DRAW CURRENT WHEN IT IS OFF on pag 20 YES NO START A on pg 2 YES ...

Страница 21: ...NCY ERROR pag 21 A B on pg 2 Is TX audio ok on internal microphone Go to NO AUDIO TX int microphone pag 23 T260 TEST SEQUENCE Is RX audio ok on internal loudspeaker Go to NO AUDIO RX int loudspeaker pag 15 Insert Headset YES NO NO NO NO NO NO YES YES YES YES YES YES All signals voltages present in this procedure has to be clear and at correct level for the right value compare them with a good pcb ...

Страница 22: ...io ok on headset Does LED service works ok Go to NO LED SERVICE pag 19 Does Real time clock works ok Go to NO REAL TIME CLOCK pag 19 G o to NO CHARGER pag 22 Go to NO MICROPHONE HEADSET pag 17 B T260 TEST SEQUENCE Does INFRARED Computer connection work correctly G o to NO IrDA pag 19 NO NO NO NO NO NO YES YES YES YES YES YES YES All signals voltages present in this procedure has to be clear and at...

Страница 23: ... there the correct signal 400Mhz on C460 Check for intermittent problem Check the presence of RX275 on pin1 of Q450 and the RX275_GSM about 1 2 Volt on L450 If NOT OK go to P on pg 6 If OK check Q450 NOTE1 or Faulty Is there 400Mhz on C460 Check Q450 U150 and U151 NOTE1 or Faulty Is correct the 400Mhz on C480 Is correct the 400Mhz on C481 Check FL457 Check Q480 NOTE1 or Faulty Check Q201 Q202 U200...

Страница 24: ...aren t not phisically damaged Is there the correct signal 400Mhz on C460 Check the presence of RX275 on pin 3 of Q450 and the RX_275_DPCS on L2450 about 1 2 Volt If NOT OK GO TO P on pg 6 If OK check Q450 NOTE1 or Faulty Check for intermittent problem NO NO NO NO NO YES YES YES YES YES Is there the correct signal on C2452 Check FL1401 NOTE1 or Faulty YES NO Are correct the RVCO_PCS and RVCO_DCS on...

Страница 25: ... OK Check U900 NOTE1 or Faulty If OK Check Q202 and U200 NOTE1 or Faulty Is present the RX275 on pin2 of Q112 Check Q112 NOTE1 or Faulty Are present RX275_GSM and RX275_DCS on pin 4 and 6 of Q110 Check the presence of GSM_SEL and DCS_SEL on pins 1 and 3 of Q110 If NOT OK Check U200 NOTE1 or Faulty If OK Check Q110 NOTE1 or Faulty Is present RX275_GSM_PCS on pin2 of Q2101 Check Q2101 NOTE1 or Fault...

Страница 26: ... OK check also U800 NOTE1 or Faulty NOTE1 check if any components mentioned are correctly positioned have not dry joint and aren t not phisically damaged NO NO YES YES YES For most of Signals Use a Test PCB as reference these signals must change their value depend on chanel selected NO Check U400 measuring the resistance between pin 4 and pin 6 of U400 to Ground remove power supply If they are OK ...

Страница 27: ...L350 U200 Pin 5 TX275_DPCS present if select DCS PCS chanel If NOT OK GO TO H on pg 11 Pin 3 TX275_GSM present if select GSM chanel If NOT OK GO TO H on pg 11 Pin 2 TX_DCS present if select DCS PCS chanel If NOT OK GO TO I on pg 12 If All are OK check U350 U200 NOTE1 or Faulty NOTE1 check if any components mentioned are correctly positioned have not dry joint and aren t not phisically damaged NO N...

Страница 28: ... U904 NOTE1 or Faulty If OK check Q370 NOTE1 or Faulty Check U390 and U200 NOTE1 or Faulty Check Q370 1 2 3 NOTE1 or Faulty Check the correct DM_CS signal on Q381 If NOT OK check U800 NOTE1 or Faulty Is correct the control signal on pin 4 of Q380 Replace Q381 Check the presence of PA_B signal on pin 5 and 8 of Q380 If NOT OK replace Q380 NOTE1 check if any components mentioned are correctly positi...

Страница 29: ...he Bias of Q331 B from R337 The gate control from U390 If NOT OK check U390 and U200 NOTE1 or Faulty Is correct the signal on pin 1 of U150 Check U150 U151 and relative control signal NOTE1 or Faulty Check the Bias of U300 Pin 2 and 8 the Negative control from gate control If NOT OK go to N on pg 9 Pin 10 to 15 the PA_B signal If NOT OK go to O on pg 9 If All are OK check U300 CR301 2 3 5 NOTE1 or...

Страница 30: ...NOT OK check U900 NOTE1 or Faulty Is present and correct the TX275 voltage on C1125 Check Q120 NOTE1 or Faulty Is present the SFOUT voltage on pin 4 of Q121 Check U200 NOTE1 or Faulty Is present the correct signal on C1126 close Q2120 Check Q121 NOTE1 or Faulty Is present the correct signal on pin 1 of Q2120 Check U200 NOTE1 or Faulty Check Q2120 NOTE1 or Faulty NOTE1 check if any components menti...

Страница 31: ...1 or Faulty L Are present on pins 3 and 1 of Q1100 the PCS_SEL and DCS_SEL from Magic IC Check U200 and Q100 NOTE1 or Faulty Is there the 5 Volt on R103 Check U903 4 NOTE1 or Faulty Are there RVCO_PCS and RVCO_DCS on pin 4 and 6 of Q1100 Check for intermittent problem Check Q1100 NOTE1 or Faulty NOTE1 check if any components mentioned are correctly positioned have not dry joint and aren t not phis...

Страница 32: ...ages check for any short to ground else check U900 NOTE1 or faulty Is the Main frequency of Y200 on R244 close U200 present and correct 26 MHz Is the Frequency 13Mhz present and correct on R238 close U200 Check the following Bias RF_V1 on Q201 2 7 V C217 RF_V2 on Q202 2 7 V C215 If NOT OK Check the correct voltage on C213 VREF from U900 than the rispective FET and U200 to solve the Fault If OK Che...

Страница 33: ...is an intermittent problem then sent to HTC Check U701 Then U800 NOTE1 or faulty Check U900 Pull Up resistor and relative capacitors NOTE1 or faulty Check U800 NOTE1 or Faulty Check U702 Then U800 NOTE1 or faulty YES NO YES NO YES NO YES A T260 NO POWER UP NO NOTE1 check if any components mentioned are correctly positioned have not dry joint and aren t not phisically damaged Is present and correct...

Страница 34: ...Loudspeaker terminals C969 etc NOTE1 or Faulty Check for intermittent problem It is only internal Loudsp problem It is only Ringer problem Is present on Pins 5 6 of Q903 about 3V Insert the correct Software and Flex File then make reset 572 If still NOT Work correctly continue Check the presence of B on Pin4 of Q903 If OK check Q903 VR900 1 NOTE1 or Faulty YES YES YES NO NO NO Is present on Pin AL...

Страница 35: ...t terminal the 1Khz about 0 5Volt P P Check J504 C511 C951 C952 R961 NOTE1 or Faulty Without Headset Is present on R977 close U800 2 7Volt Check J504 NOTE1 or Faulty Check U800 NOTE1 or Faulty Insert the Headset Is now the voltage about 0 5Volt Check J504 R976 VR902 C943 C944 If OK Check U800 NOTE1 NO NO YES YES NO YES NOTE1 check if any components mentioned are correctly positioned have not dry j...

Страница 36: ...504 about 1Volt Check J504 L500 and relative components NOTE1 or Faulty Without Headset Is present on R977 close U800 2 7Volt Check J504 NOTE1 or Faulty Check U900 and U800 NOTE1 or Faulty Insert the Headset Is now the voltage about 0 5Volt Check J504 R976 VR902 YES NO NO NO NO YES YES YES NOTE1 check if any components mentioned are correctly positioned have not dry joint and aren t not phisically...

Страница 37: ...contrast problem Check capacitors from C702 to C706 and C722 Are present the negative 10Volt on C710 Check U800 NOTE1 or Faulty Check the presence of V1 on pin 2 of U903 from GcapII if OK Check U903 U904 and relative components NOTE1 or Faulty START NO YES NOTE1 check if any components mentioned are correctly positioned have not dry joint and aren t not phisically damaged Insert the correct Softwa...

Страница 38: ...Software and Flex File then make reset 572 If still NO Real Time Cloock following the procedure Check the presence of 32 768 Mhz on Y900 If NOT OK check Y900 and U900 NOTE1 or faulty Check the RTC Battery Voltage If it is below of 2 4 Volt replace RTC Battery and check U900 and J905 Connector NOTE1 or Faulty T260 NO REAL TIME CLOCK NOTE1 check if any components mentioned are correctly positioned h...

Страница 39: ...d PCB B on C915 V_BOOST1 on C913 V_REF on C919 V1 on C906 V2 on C939 V3 on C910 VSIM1 on C905 If you found some difference Check the components which use that Voltage If you don t found any difference send PCB to HTC T260 NO POWER UP USING BATTERY T260 DRAW CURRENT WHEN IT IS OFF Check for intermittent faulty then in sequence U800 U900 NOTE1 or faulty For VSIM1 problem Check U900 NOTE1 or faulty F...

Страница 40: ...and the correct value of VREF on C919 from U900 RF_V1 on C217 from Q201 RF_V2 on C215 from Q202 Check U200 NOTE1 or Faulty NOTE1 check if any components mentioned are correctly positioned have not dry joint and aren t not phisically damaged YES NO For most of Signals Use a Test PCB as reference NO YES Is there noise on C225 13Mhz Check CR248 relative components and U200 NOTE1 or Faulty Is correct ...

Страница 41: ... of U905 with battery it must be 0Volt Check U905 and Q908 NOTE1 or Faulty Check U800 NOTE1 or Faulty Put the phone in test mode and digit 500255 Is there on pin3 of Q900 about EXT_B voltage Check R913 Is there 0Volt on pin4 of Q900 Check U900 NOTE1 or Faulty Is there about EXT_B voltage on pin4 of J604 Check Q900 NOTE1 or Faulty and J604 NOTE1 Check Q900 NOTE1 or Faulty NO NO NO NO NO NO YES YES ...

Страница 42: ...are correctly positioned have not dry joint and aren t not phisically damaged Insert the correct Software and Flex File then make reset 572 If it still NOT Work correctly Check U800 NOTE1 or Faulty and U701 NOTE1 T260 NO VOICE FEATURES T260 NO MICROPHONE INTERNAL HEADSET OK Check J900 Mic_Conn U900 and relative components NOTE1 or Faulty T260 NO VIBRACALL Put the phone in Test mode and digit 1590 ...

Страница 43: ...GPRS Tri Band T260 Level 3 procedure Rev 1 mercoledì gennaio 24 2001 MOTOROLA Level3 Authorized ...

Страница 44: ...GPRS LEAP_8485776K10_P10 1 GSM SERVICE SUPPORT GROUP 22 06 00 Level 3 Connector Schematics Rev 1 0 GPRS LEAP 8485776k10_ P10 1 Michael Hansen Ralf Lorenzen Ray Collins Page 1 of 1 REVISIONS ...

Страница 45: ... Negative Supply for LCD V2 V1 V5 V4 V3 IRS VR V2 V2 V5 V5 CAP 2 CAP 2 CAP 1 CAP 1 CAP 3 VOUT VSS 10V V2 DATA 15 0 R_W AO RESET DP_EN_L Leap GPRS Display Connector GSM SERVICE SUPPORT GROUP 03 07 00 Level 3 Display Connector Schematics Rev 1 0 GPRS LEAP 8485776k10_ P10 1 Michael Hansen Ralf Lorenzen Ray Collins Page 1 of 1 REVISIONS ...

Страница 46: ...CP A9 LO2_CP D9 LO2_EMIT SIM CONN RX_VCO_IC RVCO_PCS RX275_GSM RVCO_DCS RX275 RX275_DPCS RVCO_275 RVCO_PCS RVCO_DCS V1_SW SF_OUT RF_V2 TX275_DPCS TX_EN SF_OUT V1 WATCHDOG V3 RX275_GSM_PCS RX275_DCS TX275 TX275_GSM TX275_DPCS PA_B TX275_GSM 10V 5V V1 B VSIM1 STBY_DL V2 V_BOOST1 VREF J600 EXT CONN 1 GND 2 SW_RF 3 GND 4 BATT_FDBK 5 MAN_TEST 6 RS232_TX 7 RS232_RX 8 RS232_EN 9 ON OFF 10 GND 11 UPLINK 1...

Страница 47: ...TX VCO SIGNAL FILTERED PA OUTPUT SIGNAL PA DETECT LINE PA TUNING VOLTAGE PA TUNING VOLTAGE RX LOCAL OSC TUNING VOLTAGE RX LOCAL OSC 800MHz A B C D E F G H I J K L M N SH4 SH7 SH5 SH6 TP836 TP865 TP832 TP205 TP206 TP839 TP868 TP841 TP867 TP869 TP870 TP866 TP862 TP863 TP826 TP817 TP816 TP814 TP815 TP813 TP812 TP811 TP810 TP809 TP210 TP209 TP208 TP204 TP207 TP835 TP825 TP838 TP824 TP822 TP828 TP823 T...

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