Hytera PD362 Service Manual Download Page 54

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POWER_ON

3V0D

3V0A

3VRT

3VFGU

V_BAT

3V0D

V_BAT

VBUS

V_BAT

3V0D

V_BAT

1V2D

VBUS

V_BAT

VBUS

3V0

V_BAT

3V0D

POW-KEY-DET

(1)

PWR_ON

(1)

ppp (1)

CHG (1)

TD_IO

(1)

RXD1

(1,3)

TXD1

(1)

LCD_RSTB

(1)

LCD_CSB

(1)

LCD_SCLK

(1)

LCD_SDA

(1)

LED-LCD-BL

(1)

POWER_KEY-

(1)

RXD1 (1,3)

(1)

POWER_DET

(1)

PWR_STC3V

(1)

Model Name:

Prepare:

File No.:

Rev:

Date:

Page:

Part Name:

Hytera Communications Co.Ltd.

Check:

Approve:

V1.0

Wednesday, April 02, 2014

POWER

DMR LOWCOST PD350/PD360

Model Name:

Prepare:

File No.:

Rev:

Date:

Page:

Part Name:

Hytera Communications Co.Ltd.

Check:

Approve:

V1.0

Wednesday, April 02, 2014

POWER

DMR LOWCOST PD350/PD360

Model Name:

Prepare:

File No.:

Rev:

Date:

Page:

Part Name:

Hytera Communications Co.Ltd.

Check:

Approve:

V1.0

Wednesday, April 02, 2014

POWER

DMR LOWCOST PD350/PD360

J300

batf003g5k26

J300

batf003g5k26

C300

0.22u

C300

0.22u

R645

C320

270p

C320

270p

C338

U308

RP102N301B

U308

RP102N301B

VDD

GND

VOUT

C349

4.7u

C349

4.7u

807

PESD5V0S1UB

807

PESD5V0S1UB

L301

BLM18SG121TN1D

L301

BLM18SG121TN1D

C337

0.1u

C337

0.1u

C309

4.7uF

C309

4.7uF

D301

SD15C

D301

SD15C

C348

4.7u

C348

4.7u

R307 330

R623

U304

RP102Z301D

U304

RP102Z301D

VDD

GND

VOUT

L103

BLM15PD121SN1

L103

BLM15PD121SN1

C345

0.1u

C345

0.1u

C317

0.1u

C317

0.1u

C312

47P

C312

47P

TP1002 TD_Sy

C144

100p

C144

100p

C323

0.1uF

C323

0.1uF

U608

MC34673

U608

MC34673

VIN

PPR

CHG

GND

FAST

ISET

BAT

EPAD

C308

470p

C308

470p

R306 1k

TP301

R622

C310

0.1u

C310

0.1u

TP609

C343

100p

C343

100p

C143

100p

C143

100p

J5004

ZX62D-B-5PA8

J5004

ZX62D-B-5PA8

L303

C313

0.1u

C313

0.1u

C319

0.1u

C319

0.1u

805

64002T

805

64002T

TP302

C344

1uF

C344

1uF

TP304

L302

BLM18SG121TN1D

L302

BLM18SG121TN1D

C332

1uF

C332

1uF

C307

270p

C307

270p

C146

100p

C146

100p

L648

NLV25T-6R8J

L648

NLV25T-6R8J

C326

0.1uF

C326

0.1uF

R625

22K

R625

22K

R308

100k

R308

100k

806

64002T

806

64002T

TP108

POWERON TP108

POWERON

TP303

C302

470p

C302

470p

C314

0.22u

C314

0.22u

C327

22uF

C327

22uF

C334

4.7u

C334

4.7u

C306

0.1u

C306

0.1u

C145

100p

C145

100p

U309

XC6118N28AMR-G

U309

XC6118N28AMR-G

VOUT

VSS

VIN

VSEN

Cd/NC

R620

U310

TPS62561DDCR

U310

TPS62561DDCR

VIN

GND

C315

470p

C315

470p

C632

1000p

C632

1000p

C333

0.1u

C333

0.1u

R634

150K

R634

150K

C331

100p

C331

100p

C304

0.1u

C304

0.1u

C266

470P

C266

470P

U300

VDD

GND1

VOUT

GND2

R621
NC

C336

100p

C336

100p

L300

BLM18PG1

L300

BLM18PG1

L305

BLM18SG121TN1D

L305

BLM18SG121TN1D

C157

100p

C157

100p

TP305

R304

47k

R304

47k

R639

12K

R639

12K

U301

RP102N301B

U301

RP102N301B

VDD

GND

VOUT

R658

C265

1000P

C265

1000P

Q616

DTC114YE

Q616

DTC114YE

C305

2.2u

C305

2.2u

Q300

DTC114YE

Q300

DTC114YE

C341

2.2uF

C341

2.2uF

C330

4.7uF

C330

4.7uF

J201

LCD

J201

LCD

C321

0.1u

C321

0.1u

R638

8.2K

R638

8.2K

R301

180K

R301

180K

C311

22uF

C311

22uF

R119 10K

C329

0.1u

C329

0.1u

R227 47k

R121

R226

L307

BLM18SG121TN1D

L307

BLM18SG121TN1D

TP300

R662

R305

C619

4.7uF

C619

4.7uF

C339

2.2u

C339

2.2u

C350

0.1u

C350

0.1u

R122

150K

R122

150K

L206 56

C322

270p

C322

270p

D300

DAN222

D300

DAN222

103

520S-30

103

520S-30

C641

4.7uF

C641

4.7uF

C342

4.7uF

C342

4.7uF

L212

BLM15PD121SN1

L212

BLM15PD121SN1

U302

RP102N301B

U302

RP102N301B

VDD

GND

VOUT

C316

4.7uF

C316

4.7uF

C347

100p

C347

100p

R635

R303

180K

R303

180K

L306
0

C149

0.1u

C149

0.1u

C303

4.7uF

C303

4.7uF

C267

0.1u

C267

0.1u

L645

BLM15PD121SN1

L645

BLM15PD121SN1

C273

0.1uF

C273

0.1uF

C352

1uF

C352

1uF

C621

1000p

C621

1000p

C301

0.22u

C301

0.22u

TP306

C328

0.1uF

C328

0.1uF

C340

0.1u

C340

0.1u

TP608D-

C631

1000p

C631

1000p

R642

10K

R642

10K

R646

10K

R646

10K

C325

0.1u

C325

0.1u

C346

0.1u

C346

0.1u

C318

2.2u

C318

2.2u

U307

RP102N301B

U307

RP102N301B

VDD

GND

VOUT

C324

0.1u

C324

0.1u

L646

BLM15PD121SN1

L646

BLM15PD121SN1

U306

RP102N301B

U306

RP102N301B

VDD

GND

VOUT

C335

0.1u

C335

0.1u

C150

1uF

C150

1uF

Power supply and interface circuit

Summary of Contents for PD362

Page 1: ...PORTABLE ...

Page 2: ...he product repair It is intended for use by qualified technicians only To repair the product properly please read this manual carefully before repairing This manual is applicable to the following product PD36X Digital Portable Radio X may represent 2 5 6 or 8 ...

Page 3: ...ding patent rights copyrights and trade secrets of Digital Voice Systems Inc This voice coding technology is licensed solely for use within this product The user of this technology is explicitly prohibited from attempting to decompile reverse engineer or disassemble the Object Code or in any other way convert the Object Code into a human readable format U S Patent No 6 912 495 B2 6 199 037 B1 5 87...

Page 4: ...ates situations that could cause major personal injury or even death Notation Conventions Notation Description The quotation marks enclose the name of a software interface element For example click OK Bold The text in boldface denotes the name of a hardware button For example press the PTT key The symbol directs you to access a multi level menu For example to select New from the File menu we will ...

Page 5: ...Ua 400 440 MHz ...

Page 6: ...U 20 6 Troubleshooting Flow Chart 22 6 1 Control Circuit 22 6 1 1 No display upon power on or abnormal display 22 6 1 2 No voice output by speaker 23 6 1 3 No modulation signal in transmission 24 6 2 Receiver Circuit 25 6 3 Transmitter Circuit 26 6 4 FGU Circuit 29 7 Interface Definition 31 8 Tuning Description 32 8 1 Tools 32 8 2 Tuning Procedure 32 8 2 1 Tuning a radio 32 8 2 2 Testing a radio 3...

Page 7: ...Contents Ua 400 440 MHz ii 10 7 Transmitter Circuit 43 11 Schematic Diagram 44 12 Parts List 54 ...

Page 8: ...Push to Talk Key 13 LED Indicator 2 SK1 Side Key 1 14 Microphone 3 Antenna 15 Cancel Return Key 4 Speaker 16 Volume Right Key 5 LCD Display 17 Power On Off ESC Key 6 OK Menu Key 18 P3 Key 7 Up Key 19 Down Key 8 Volume Left Key 20 Charging Data Connector 9 Call Key 21 Earpiece Connector ...

Page 9: ...Product Controls Ua 400 440 MHz 2 No Part Name No Part Name 10 P1 Key 22 Battery Cover Open up 11 P2 Key 23 Battery Cover 12 Strap Hole ...

Page 10: ... radio To assemble the radio do vice versa Caution Please position the waterproof ring properly during reassembly Use the thumb and index finger to move the silicon rubber of SK1 key until SK1 key is well assembled Step 1 To remove the battery do as follows Step 2 Remove the chassis Remove the four T6 screws and take out the chassis ...

Page 11: ...emove the main board 1 First unplug the speaker connector and Keypad FPC connector and then remove the one T6 screw 2 Take out the main board in the direction shown in the figure below Step 4 Remove the keypad board 3 Remove the two screws on the back ...

Page 12: ...440 MHz Disassembly and Assembly 5 4 Remove the keypad board Step 5 Remove the LCD display 5 Straighten the two fixing plates securing the LCD display See the figure below 6 Take out the LCD display vertically ...

Page 13: ...sembly and Assembly Ua 400 440 MHz 6 Step 6 Remove the aluminum chassis shielding cover 7 Remove the three screws securing the aluminum chassis shielding cover 8 Take out the aluminum chassis shielding cover ...

Page 14: ...000000 Conductive sponge for aluminum chassis 1 29 6002124000000 Micro USB cover 1 5 7400656000000 Earpiece PC sheet 1 30 6002126000000 Front case 1 6 PCB main board 1 31 7500717000000 Motor PORON 1 7 7500724000000 LCD PORON pad 1 32 6002128000000 Antenna cover 1 8 7102002500000 Machine screw M2 0x2 5mm 2 33 6101008000000 Transparent silicon rubber light guide 1 9 7500376000010 Conductive sponge f...

Page 15: ...000030 Microphone 1 18 7500748000000 Double sided adhesive tape for LCD lens 1 43 6300253000000 Aluminum chassis shielding cover 1 19 6101009000000 P R keypad 1 44 6101018100000 Silicon rubber pad for battery 4 20 6002125000000 LCD lens 1 45 6101059100000 Silicone rubber plug for RF test port 1 21 6203685000000 Decoration sheet left side 1 46 6101023100000 Main waterproof ring 1 22 6002110000000 P...

Page 16: ...Ua 400 440 MHz Exploded View and Packaging Guide 9 3 2 Packaging Guide ...

Page 17: ...rating Temperature 30 C to 60 C Dimensions H W D with standard battery without antenna 106 mm 57 mm 23 mm Weight with antenna standard battery About 180 g Frequency Stability 0 5 ppm Receiver Sensitivity Analog 0 28 μV 12 dB SINAD 0 22 μV Typical 12 dB SINAD 0 22 μV 20 dB SINAD Digital 116 dBm BER5 Adjacent Channel Selectivity TIA 603 60 dB 12 5 kHz 70 dB 25 kHz ETSI 60 dB 12 5 kHz 70 dB 25 kHz In...

Page 18: ...to change without notice due to continuous development Rated Audio Power Output 0 4 W 8 Ω load Rated Audio Distortion 5 Transmitter Power Output 3 W 1 5 W Conducted Radiated Emission 36 dBm 1 GHz 30 dBm 1 GHz Modulation Limiting 2 5 kHz 12 5 kHz 5 0 kHz 25 kHz FM Noise 40 dB 12 5 kHz 45 dB 25 kHz Audio Distortion 3 ...

Page 19: ...e adjust BEEP 3V0A BAT T R SW CVread BIAS_DOWN RSSI PTT 12MHZ OPT_SEL R G RESET 3V3D W N EEPROM 24FC512 I SM I2C 3V3D 3V0D 1V2 LOR LOL IN3R IN1L HPL IN2L AF_MUTE AF_MUTE USART port VOX VOX EXT_interface ext_mic ext_spk V_CHARGER LCD LCD_RSTB LCD_CSB LCD_SDA LCD_SCLK A0 5 1 1 Power Supply Module Diagram of Power Control The power supply employs a single 3 7V li ion battery The RF section uses LDO t...

Page 20: ...34673 CHG VBUS PPP After inserted the charger wake up the walky talky Read charger status Detect charger inserted EM6M2 EM6M2 3V_TX_RF 3V_RX_RF TEM LEV DET TC TX_EN RX_EN To SCT 3928 U203 Security Key crystal Codec To LED To SCT3928 To_ EEPROM To MCU To Codec LDOIN RESET To Mic amp RESET R3112Q271A POWER_KEY POWER_KEY To keypad hardware connectted DC2DC_ CTRL To VCO To FAST LOCK VCC_VC_ TCXO 3V0_F...

Page 21: ...e radio powers RQ After power on PWR_ON goes to high level and PWR KEY_DET goes to low level During power off POWER_KEY is at low level while PWR KEY_DET is at high level The system detects power off procedure via PWR KEY_DET and implements the power off procedure Then PWR_ON and POWER_ON go to low level and the power is cut off ...

Page 22: ...S0DO S0DI S1CLK S1FS S1DO S1DI CLKIN SCL SDA FLASH_CLK FLASH_CE FLASH_DI FLASH_DO MCU PLL_CLK PLL_STB PLL_ DATA PLL_LD SQL RSSI BAT_DET APC TV ADJ_CRY Volume adjust T R SW CVread BIAS_DOWN RSSI PTT 12MHZ OPT_SEL R G RESET 3V3D W N EEPROM 24FC512 I SM I2C 3V3D 3V0D 1V2 AF_ MUTE USART port VOX EXT_ interface ext_mic ext_spk V_ CHARGER LCD LCD_RSTB LCD_CSB LCD_SDA LCD_SCLK A0 ...

Page 23: ...320AIC3204 The audio amplifier uses MAX9716EUA The diagram is as follows CODEC TLV320AIC3204 AMP MAX9716EUA MCLK BCLK WCLK DIN DOUT MCLK VDD3V3 12 288MHZ SCL SDA Security Key I2S VOICE CODER Protoccol Stack 4FSK FM Demod Channel Selection SCT3928 S0CLK S0FS S0DO S0DI S1CLK S1FS S1DO S1DI CLKIN SCL SDA FLASH_CLK FLASH_CE FLASH_DI FLASH_DO MOD_VCO MOD_REF AFDET BEEP 3V0A BAT 3V0D 1V2 LOR LOL R IN3R ...

Page 24: ...gnal is sent to TLV320AIC3204 via I2S interface for DA conversion and amplifying Finally the audio signal is output to FGU for two path modulation via the LOL R port of TLV320AIC3204 External Connector Earpiece connector Ф2 5mm standard earpiece connector for specific earpiece USB port It is used for battery charging and programming Audio Amplifier Main parameters of MAX9716EUA are listed in the t...

Page 25: ... pre driver amplifier 2SC3356 for prH amplification allowing DQ interstage isolation between the pre driver amplifier and the next amplifier Then the signal goes to another pre driver amplifier BFQ540 and the driver amplifier 2SK3078 for further power amplification to provide DGHTXDWHO DPSOLILHG signal to the final stage amplifier RFM03U3CT for final power amplification After amplified by multiple...

Page 26: ...tion 12 5kHz 18dBc 25kHz 40dBc 2 2nd IF 85dBc Vdd 3Vdc Input level 99dBm 2nd Lo Vdd 3Vdc Frequency 38 4MHz Current Drain 2mA output level 22dBm Pi Attenuator Lo input level 7dBm IL 0 5dB Zin Zout 50R Attenuator Protect RB706F 3Vdc Double Circuit 2SC5108 3VFGU VCTCXO 19 2MHz BA4116FV AF OUT Receiver Front end The HF signal from the low pass filter passes through the electrically tunable first stage...

Page 27: ...l goes through the 450 kHz ceramic filter to filter out the spurious signal and it is amplified afterwards with its frequency discriminated Then the second IF signal is processed internally and demodulated Finally the demodulated signal is sent to the baseband section for audio processing The FGU composed of VCO and PLL is the core module of the whole TX RX system This unit provides accurate carri...

Page 28: ...e and then uses the control signals VCC_VCO_L and VCC_VCO_H to switch operating status VCO_L is used for receiSW while VCO_H is used for transmiVVLRQ Two point Modulation In TX mode the two point modulation is employed to obtain higher modulation accuracy and lower 4FSK bit error rate MOD_VCO and MOD_REF send the modulation signal to the modulation end of VCO and the reference crystal oscillator o...

Page 29: ...d its connection are normal The power supply of LCD is normal No Check U307 The LCD clock reset and data signals are normal Check whether the LCD and its connection are normal No MCU power supply and clock are normal No Check whether X100 crystal oscillator and U302 are normal MCU reset signal 14 pin is normal Check U103 1V2D 3V0D 3VRT and 3VFGU are normal No Check U300 U302 U306 and U304 Yes 12 2...

Page 30: ... CODEC audio input AF_IN is normal No Refer to receiver circuit for repairing information 3V0D and 3V0A are generated normally Check U301 U302 Yes CODEC Reset is normal Yes U802 is abnormal or damaged No Check D8005 and MCU No Check MCU Does CODEC send data to SCT3928 SIDI signal CODEC is abnormal or damaged No Yes Does SCT3928 send data back to CODEC SIDO signal CODEC is abnormal or damaged No No...

Page 31: ...04 is normal Refer to FGU diagram for repairing information No Check whether U401 works normally No Yes Completed Does CODEC send data to SCT3928 SIDI signal CODEC is abnormal or damaged No Yes Does SCT3928 send data back to CODEC SIDO signal CODEC is abnormal or damaged No No MCU controls SCT3928 normally SCT3928 is abnormal or damaged Yes Yes CODEC power supply and reset signals are normal Check...

Page 32: ... The static working point of Q6005 is normal 3 Yes Completed No 3VRT outputs normally 2 Check Q6006 Check Q611 and peripheral components Check X8001 and related components 19 2 MHz is normal 7 The static working point of Q6006 is normal 4 LNA_Out output is normal 8 Check Q6005 and front end RF circuit LO signal output is normal 9 RX_LO output is normal 10 First IF output is normal 11 Check Z6001 Q...

Page 33: ...signal at C6094 to test IF sensitivity Normally the IF sensitivity is 109dBm 6 Frequency of Q611 is 38 4 MHz output by C697 7 Frequency output by 2NDLO_1 is 19 2 MHz 8 Input a 40dBm RF signal at the antenna connector and test at R6047 Normally gain is KLJKer than 10 dB and output signal is VWURQJer than 0 dBm 9 Test at C6093 the post stage circuit has not been cut off Normally the frequency is 38 ...

Page 34: ...ace Q6008 Check the power supply circuit Power level is normal 6 D8021 RF connector and the low pass network are normal 7 Match network is normal 8 Q404 and Q406 work normally 9 Q405 works normally 10 Q606 works normally 11 Check the output circuit of FGU Power level is normal Power level is normal Power level is normal Power level is normal Repair damaged components Repair damaged components Powe...

Page 35: ...t 0 7 V The low pass coil must be soldered appropriately and remain in good condition The RF connector must remain in good condition 8 The match components must be soldered appropriately and remain in good condition 9 Vdd is about 3 7 V for low power Vgg is 1 2 to 1 4 V for high power Vgg is 1 4 to 1 6 V 10 Vdd is about 3 7 V for low power Vgg is 1 2 to 1 4 V for high power Vgg is 1 4 to 1 6 V 11 ...

Page 36: ...8 and peripheral components Replace Q8004 and Q8008 Replace L8018 and L8045 L8018 and L8045 are normal 4 Feedback is output Check the feedback circuit 19 2MHz crystal oscillates Check the 19 2MHz circuit Sky72310 clock is normal 6 Check the data control circuit of Sky72310 Check Q8007 Q8010 and peripheral components No Signal Amplitude is normal 7 8 Check the data control circuit of Sky72310 Descr...

Page 37: ...ole E the voltage is about 2 6 V at pole C of Q8007 about 0 84 V at pole B and about 0 12 V at pole E 6 PLL_Clk outputs 960 kHz clock 7 During receipt D501 is off and D502 is on the positive pole voltage is about 1 02 V during transmission D501 is on and D502 is off the positive pole is at a voltage of about 1 02 V 8 During normal operation when there is no load connected to the post stage of C807...

Page 38: ...400 440 MHz Interface Definition 31 7 Interface Definition The definition of each pin is described as below Interface Pin No Signal Function J5004 1 VBUS 2 RXD1 3 TXD1 4 TD_IO 5 GND J800 1 SPK 2 MIC 3 GND ...

Page 39: ...e Tuner software and go to TUNE_DATA TX Reference Oscillator Warp in the left navigation tree Then click the Transmit On button 3 Observe the frequency displayed on HP8921 and adjust the vernier until the frequency offset is less than or equal to 40 Hz 4 Click the Transmit Off button Transmit Power Calibration Here takes the TX low power tuning for example 1 Connect the antenna connector of the ra...

Page 40: ...n is 4 3k 50 Hz 5 Click the Transmit Off button Modulation Balance 1 Connect the antenna connector of the radio to HP8921 and set HP8921 to TX test mode 2 Set the HP8921 parameters as follows IF Filter 230 kHz Filter1 20 Hz HPF Filter2 15 kHz LPF De Emphasis OFF AFGen1 Freq OFF AFGen Lv1 15 5 mV 3 Open the Tuner software and go to TUNE_DATA TX Modulation Balance in the left navigation tree Then se...

Page 41: ...epeat Step 3 to Step 13 RX Section Front end Filter 1 Connect the antenna connector of the radio to HP8921 2 Connect the Audio Out port of the radio to the Audio In port of HP8921 and set HP8921 to RX test mode 3 Set the HP8921 parameters as follows Output RF signal 118 dBm Frequency Modulation frequency 1 kHz Modulation deviation 3 kHz De Emphasis 750 us 4 Observe the value displayed on the HP892...

Page 42: ...equency to be tested STD IB 511 153 Step 4 Click the Transmit On button Step 5 View all tested items on the Aeroflex 3920 and make sure they satisfy the following requirements Frequency Error 100 Hz Transmit Power 2 5 0 2 W FSK Error 5 Magnitude Error 1 Receiving Step 1 Open the Tuner software and go to TEST RX Receiver BER 0 153 Step 2 Select the frequency to be tested Step 3 Set the Aeroflex 392...

Page 43: ...9 PCB View Main Board_Top Layer 35 ...

Page 44: ...Main Board_Bottom Layer 36 ...

Page 45: ...3928 MCU STM32F100VD SPI McBSP2 McBSP1 MPUIO GPIOs SPI IIS USB SPI3 GPIOs Mic preamp Audio preamp MCLK 19 2MHz FGU module RF Control RF Unit MCSI1 HPI CS3 GPIOs MCLK 12 0MHz XTAL UART3 UART2 I2C1 GPIOs JTAG AUDIO AMP I2C LCD HPI HPI IIS SPI2 Security Key UART1 Key Board GPIOs MCLK I2C I2C IIS TX module RX module Tx Rx Switch ANT AF_IN MOD_REF MOD_VCO ...

Page 46: ...ter 3V0A_FGU_PLL PLL_CLK PLL_STB PLL_DATA PLL_LD RX VCO TX VCO LNA AT41511 IF AMP 2SC5108 LPF 3VFGU LPF Tuning Filter1 Attenuator Protect RB706F 38 85MHZ RFM03U3CT HSMS 2827 Double Circuit 2SC5108 38 4MHz MOD_REF SQL RSSI BAT PreDriver 2 Match PreDriver 1 2SK3078 2SC3356 SW CHARGE FGU PRE_FlOCK FL_FLOCK 450KHZ G IF Filter AFDET SQL RSSI BFQ540 Match Balun Balun VCO_L H_En 3V_TX_RF 3V_TX_RF 3V_TX_R...

Page 47: ... S0FS S0DO S0DI S1CLK S1FS S1DO S1DI CLKIN SCL SDA FLASH_CLK FLASH_CE FLASH_DI FLASH_DO MCU PLL_CLK PLL_STB PLL_DATA PLL_LD MOD_VCO MOD_REF AFDET SQL RSSI BAT_DET APC TV ADJ_CRY Volume adjust BEEP 3V0A BAT T R SW CVread BIAS_DOWN RSSI PTT 12MHZ OPT_SEL R G RESET 3V3D W N EEPROM 24FC512 I SM I2C 3V3D 3V0D 1V2 LOR LOL IN3R IN1L HPL IN2L AF_MUTE AF_MUTE USART port VOX VOX EXT_interface ext_mic ext_sp...

Page 48: ...09 U608 CHARGER MC34673 CHG VBUS PPP After inserted the charger wake up the walky talky Read charger status Detect charger inserted EM6M2 EM6M2 3V_TX_RF 3V_RX_RF TEM LEV DET TC TX_EN RX_EN To SCT 3928 U203 Security Key crystal Codec To LED To SCT3928 To_ EEPROM To MCU To Codec LDOIN RESET To Mic amp RESET R3112Q271A POWER_KEY POWER_KEY To keypad hardware connectted DC2DC_ CTRL To VCO To FAST LOCK ...

Page 49: ...8 Gain 5dB isolation 20dB Current 4mA 2SC3356 Gain 10dB isolation 15dB Current 10mA 3dB BW 3 5K Phase Margin 30 55 A 0 1Vpp 2 0Vpp S21 3dB Fpass 500MHz Fstop 800MHz Astop 40dB Kv 30MHz V CV 0 8 2 3V F 361 15 401 15MHz PN 116dBc Hz 12 5KHz Kv 30MHz V CV 0 8 2 3V F 400 440MHz PN 116dBc Hz 12 5KHz 3 0v for core Vp Compare frequence 4 8MHz Prescaler Level 50 250mVpp Pi Attenuator isolation 1dB FGU Clo...

Page 50: ...ass Filter BA4116 BPF1 Low Noise Amp AT 41511 BPF2 Mixer HSMS 2827 IF Filter 38 85MHz IF Processor IF Amp 2SC5108 ANT LPF Tuned Voltage Lo OSC Lo Amp 2SC3356 Pi Attenuator Double Circuit 2SC5108 VC TCXO 19 2MHz T R SW 10 6 Receiver Circuit ...

Page 51: ...TT I V convertor APC module 1 attack time and decay time is less than 1 5 mS 2 close gain rate Ga is large than 20 value Gain 15 dB Po 1dB 5 dB mstatic Ic 12 mA S a m p l i n g r e s i s t o r Pre Driver 2 Drive stage Final stage Low pass Filter Pre Driver 1 PA match Tx Rx Switch 2SC3356 BFQ 540 2SK3078 RFM03U3CT T 3 V APC From TV To RX TxVCO 3 V 2SC3356 2SC5108 T R T R T R 10 dB Gain 15 dB Po 1dB...

Page 52: ... HD105 R126 47k R126 47k R134 4 7k R134 4 7k R113 NC R113 NC C148 470p C148 470p HD109 HD109 R177 100 R177 100 HD106 HD106 R173 100 R173 100 D101 R_LED D101 R_LED R167 100 R167 100 C117 0 1u C117 0 1u SW103 PTT SW103 PTT 1 2 3 4 RN112 100 4 RN112 100 4 1 2 3 4 5 6 7 8 HD103 HD103 R158 100 R158 100 TP104 SK1 TP104 SK1 C127 0 1u C127 0 1u R100 10k R100 10k R154 100 R154 100 C122 0 1u C122 0 1u U100 ...

Page 53: ... 2 R213 4 7K R213 4 7K C229 470p C229 470p R204 0 R204 0 C211 33p C211 33p C253 470p C253 470p C213 33p C213 33p C216 10u C216 10u C261 470p C261 470p C271 NC C271 NC TP202 M_REF TP202 M_REF 1 R214 4 7K R214 4 7K R207 0 R207 0 C228 0 1u C228 0 1u R221 18 R221 18 C252 0 1u C252 0 1u C237 470p C237 470p R215 33 R215 33 C247 0 1u C247 0 1u C260 0 1u C260 0 1u C219 1uF C219 1uF C208 10u C208 10u R202 ...

Page 54: ...T TP108 POWERON TP108 POWERON 1 TP303 TP303 1 C302 470p C302 470p C314 0 22u C314 0 22u C327 22uF C327 22uF 1 2 C334 4 7u C334 4 7u C306 0 1u C306 0 1u C145 100p C145 100p U309 XC6118N28AMR G U309 XC6118N28AMR G VOUT 1 VSS 2 VIN 3 VSEN 4 Cd NC 5 R620 NC R620 NC U310 TPS62561DDCR U310 TPS62561DDCR VIN 1 GND 2 EN 3 FB 4 SW 5 C315 470p C315 470p C632 1000p C632 1000p C333 0 1u C333 0 1u R634 150K R63...

Page 55: ...21 100p D405 EDZ6 8B D405 EDZ6 8B 1 2 C813 33p C813 33p R818 4 7K R818 4 7K Q801 2SA1832 Q801 2SA1832 1 2 3 L405 BLM15PD121SN1 L405 BLM15PD121SN1 R802 NC R802 NC C424 0 1u C424 0 1u R412 10k R412 10k C817 0 1u C817 0 1u C426 1uF C426 1uF R815 4 7k R815 4 7k R418 1M R418 1M T807 SPK T807 SPK 1 R807 10 R807 10 C430 1uF C430 1uF R812 22k R812 22k T805 EXT_PTT T805 EXT_PTT 1 L403 BLM15PD121SN1 L403 BL...

Page 56: ...PF C693 0 1u C693 0 1u C717 NC C717 NC C738 0 01u C738 0 01u C779 NC C779 NC R712 1 5K R712 1 5K TP614 AF TP614 AF 1 Q618 DTA114YE Q618 DTA114YE 3 1 2 R714 100K R714 100K C697 100p C697 100p C784 470p C784 470p C683 0 1u C683 0 1u U602 BA4116FV U602 BA4116FV OSC IN 1 OSC OUT 2 MIX OUT 3 VCC 4 IF IN 5 DEC 6 FIL OUT 7 FIL IN 8 AF OUT 9 QUAD 10 IF OUT 11 RSSI 12 N DET 13 N REC 14 GND 15 MIX IN 16 C69...

Page 57: ... 4 3 5 R6047 0 R6047 0 R6044 NC R6044 NC R6028 100k R6028 100k C8117 470p C8117 470p C707 4pF C707 4pF L6023 4T L6023 4T C6063 6pF C6063 6pF RP1 RF RP1 RF 1 C703 2 7p C703 2 7p C6098 9pF C6098 9pF L6016 330nH L6016 330nH C6078 NC C6078 NC C6100 9pF C6100 9pF R8080 12K R8080 12K C6053 470p C6053 470p L6017 22nH L6017 22nH C6101 27p C6101 27p T6001 4BMH T6001 4BMH 6 1 2 4 3 5 R6030 330 R6030 330 C60...

Page 58: ...6 NC C7019 470p C7019 470p R7046 NC R7046 NC R7045 NC R7045 NC R7049 1K R7049 1K C7002 470p C7002 470p R7014 82K R7014 82K R7056 0 1R R7056 0 1R R7048 0 R7048 0 R7009 1M R7009 1M R7017 1 8M R7017 1 8M R7013 390K R7013 390K R7023 NC R7023 NC Q7010 EM6M2 Q7010 EM6M2 6 2 1 4 5 3 D7003 NC D7003 NC 1 2 R7007 NC R7007 NC R7004 1 8M R7004 1 8M R7008 NC R7008 NC C7007 NC C7007 NC C7015 NC C7015 NC R7050 N...

Page 59: ... C7067 NC C7041 4pF C7041 4pF C7034 2 4p C7034 2 4p Q7004 2SC3356 Q7004 2SC3356 2 3 1 C481 24P C481 24P C626 NC C626 NC R672 47k R672 47k R630 47k R630 47k C7035 6P C7035 6P R667 NC R667 NC C640 100p C640 100p C642 20P C642 20P RP2 RF_SW RP2 RF_SW 1 J102 SPC0200A1 003 SPA5G 50 J102 SPC0200A1 003 SPA5G 50 1 1 2 2 3 3 4 4 5 5 6 6 C7033 5 6P C7033 5 6P L7005 5 6nH L7005 5 6nH R6032 82K R6032 82K R628...

Page 60: ...21SN1 1 2 L8006 0 56uH L8006 0 56uH R8020 NC R8020 NC R8007 120 R8007 120 C8033 1uF C8033 1uF C8022 1uF C8022 1uF C8018 470p C8018 470p D8002 RB520S 30 D8002 RB520S 30 1 2 L8004 BLM15PD121SN1 L8004 BLM15PD121SN1 1 2 L8008 BLM15PD121SN1 L8008 BLM15PD121SN1 1 2 C576 1800P C576 1800P TP8004 PLL_Data TP8004 PLL_Data 1 C8011 0 1u C8011 0 1u TP8003 PLL_CS TP8003 PLL_CS 1 C8031 0 1u C8031 0 1u C8036 220p...

Page 61: ...023 10 1 2 R465 100k R465 100k L8027 33nH L8027 33nH R8060 150k R8060 150k R8062 470k R8062 470k C8097 0 1u C8097 0 1u C8113 560p C8113 560p C128 470P C128 470P Q8011 EM6M2 Q8011 EM6M2 6 2 1 4 5 3 L8014 BLM15PD121SN1 L8014 BLM15PD121SN1 1 2 C507 7p C507 7p C8075 0 1u C8075 0 1u Q8002 EM6M2 Q8002 EM6M2 6 2 1 4 5 3 C8078 470p C8078 470p L8034 BLM15PD121SN1 L8034 BLM15PD121SN1 1 2 C8095 470p C8095 47...

Page 62: ...Earpiece Connector 15 C123 B1A 3101011040080 0 1uF 491 L100 B1G 3221505121010 BLM15PD121SN1 D 16 C124 B1G 3101011040080 0 1uF 492 L101 B2I 3221505121010 BLM15PD121SN1 D 17 C125 B3G 3101011040080 0 1uF 493 L102 B1I 3221505121010 BLM15PD121SN1 D 18 C126 B3I 3101011040080 0 1uF 494 L103 B1G 3221505121010 BLM15PD121SN1 D 19 C127 B2G 3101011040080 0 1uF 495 L113 T3F 3210306470000 47nH 20 C128 T3G 31010...

Page 63: ... 10UF 530 L6024 T4A 3212106270000 27nH 55 C206 T3I 3101061050060 1UF 531 L6025 T4A 3239999190000 Air core coil 21nH 56 C207 T3H 3101052730000 0 027UF 532 L6026 T4B 3239999190000 Air core coil 22nH 57 C208 B3I 3101071060010 10UF 533 L6028 T3D 3213306681010 0 68uH 58 C209 T3I 3101051050160 1uF 534 L6029 T3E 3213306681010 0 68uH 59 C211 T3I 3101013300010 33PF 535 L6030 T3E 3212106221000 220nH 60 C212...

Page 64: ...1010 BLM15PD121SN1 D 100 C253 T2I 3101014710010 470PF 576 L8018 T4G 3213306332000 3 3uH 101 C254 T2I 3101011040080 0 1uF 577 L8019 T4G 3217107100010 10nH 102 C255 T2I 3101014710010 470PF 578 L8020 T4G 3247107180000 18nH 103 C256 T2I 3101011040080 0 1uF 579 L8022 T3F 3221505121010 BLM15PD121SN1 D 104 C257 T2I 3101014710010 470PF 580 L8023 T3F 3001061000000 10Ω 105 C258 T1I 3101011040080 0 1uF 581 L...

Page 65: ...3401002000990 NPN transistor 143 C325 B1G 3101011040080 0 1uF 619 Q8011 T3F 3403999000070 Compound transistor 144 C326 B3I 3101011040080 0 1uF 620 Q8012 T3F 3503010000010 P MOSFET 145 C327 B4C 3101082260020 22UF 621 Q8013 T3D 3403007000020 Bias resistor transistor 146 C328 B3I 3101051040100 0 1UF 622 Q8014 T3E 3408002000000 NPN transistor 147 C329 B2A 3101011040080 0 1uF 623 Q802 B2D 3403008000050...

Page 66: ...1050700010 7PF 669 R155 B1H 3001011010080 100Ω 194 C508 T3H 3101050900000 9PF 670 R156 B2I 3001011010080 100Ω 195 C509 T3H 3101050700010 7PF 671 R157 T1F 3001011010080 100Ω 196 C553 T4H 3101053300000 33PF 672 R158 T1F 3001011010080 100Ω 197 C554 T4H 3101053310030 330PF 673 R159 B1H 3001011010080 100Ω 198 C555 T4H 3101053320010 3300PF 674 R160 B1H 3001011040030 100KΩ 199 C576 B3H 3101051820000 1800...

Page 67: ... 3101011020060 1000pF 722 R222 T3I 3001052200010 22Ω 247 C627 T2C 3101061210020 120PF 723 R223 T3I 3001054730010 47KΩ 248 C628 T2C 3210306569000 5 6nH 724 R224 T3H 3001014720050 4 7KΩ 249 C629 T2C 3101061600000 16PF 725 R226 B1H 3001011020060 1KΩ 250 C630 B4C 3101082260020 22UF 726 R227 B3I 3001014730010 47KΩ 251 C631 B1A 3101011020060 1000pF 727 R229 T3H 3001014720050 4 7KΩ 252 C632 B2A 310101102...

Page 68: ...22KΩ 299 C7041 T3A 3101050400010 4PF 775 R626 T2D 3001053920000 3 9KΩ 300 C7042 T4A 3101055610040 560PF 776 R627 T2C 3001054730010 47KΩ 301 C7048 T4A 3101065610000 560PF 777 R628 T2C 3001051220090 1 2KΩ 302 C7049 T2E 3101051500020 15PF 778 R629 T3F 3001013320000 3 3KΩ 303 C705 T4E 3101050400010 4PF 779 R630 T2C 3001054730010 47KΩ 304 C7051 B1I 3101014710010 470PF 780 R631 T2C 3001051220090 1 2KΩ 3...

Page 69: ...KΩ 352 C8020 B4H 3101011040080 0 1uF 828 R7048 B3C 3001050000000 0Ω 353 C8021 B4H 3101014710010 470PF 829 R7049 B3D 3001011020060 1KΩ 354 C8022 B3G 3101011050000 1uF 830 R7052 T2E 3001051000020 10Ω 355 C8023 B4G 3101011040080 0 1uF 831 R7053 T2E 3001051210010 120Ω 356 C8024 B4H 3101011020060 1000pF 832 R7055 B2A 3001062710000 270Ω 357 C8025 B4H 3101071060010 10UF 833 R7056 B4B 3001080190000 0 1Ω 3...

Page 70: ... T4G 3101011040080 0 1uF 881 R8065 T4G 3001055600010 56Ω 406 C8098 T3F 3101051500020 15PF 882 R8066 T4F 3001058210000 820Ω 407 C810 B1B 3101051040100 0 1UF 883 R8067 T4F 3001058220010 8 2KΩ 408 C8102 B3H 3101011020060 1000pF 884 R8068 T4F 3001061800000 18Ω 409 C8103 T4F 3101051010030 100PF 885 R8069 B3G 3001011020060 1KΩ 410 C8104 T4H 3101062250200 2 2UF 886 R807 B2A 3001061000000 10Ω 411 C8106 T4...

Page 71: ...de 925 U101 T2H 3612051000020 Memory 512K 450 D406 T1C 3399990000080 Zener diode 926 U103 B2I 3609006000000 Reset IC 451 D501 T3E 3303030800020 Switching diode 927 U200 T2I 3613999000070 Baseband processor IC 452 D502 T3E 3303030800020 Switching diode 928 U201 T3I 3606010000070 D A conversion IC 453 D6003 T3C 3303030300000 Schottky barrier diode 929 U202 B2I 3617023000000 Logic IC 454 D6004 T3C 33...

Page 72: ...3304010100220 Varactor 947 X100 B2I 3701001260120 Crystal 12MHz 472 D8012 T4G 3304010100890 Varactor 948 X200 T3I 3701122830020 TCXO 12 288000 MHz 473 D8015 T4H 3304010100220 Varactor 949 X8001 B4H 3701019250000 VC TCXO 19 2 MHz 474 D8016 T4H 3304010100220 Varactor 950 Z6001 T3D 3802388540020 Crystal filter 38 850 MH 475 D8019 T4H 3304010100220 Varactor 951 Z601 B3F 3801045030170 Moistureproof Cer...

Page 73: ...Uc 430 470 MHz ...

Page 74: ...U 20 6 Troubleshooting Flow Chart 22 6 1 Control Circuit 22 6 1 1 No display upon power on or abnormal display 22 6 1 2 No voice output by speaker 23 6 1 3 No modulation signal in transmission 24 6 2 Receiver Circuit 25 6 3 Transmitter Circuit 26 6 4 FGU Circuit 29 7 Interface Definition 31 8 Tuning Description 32 8 1 Tools 32 8 2 Tuning Procedure 32 8 2 1 Tuning a radio 32 8 2 2 Testing a radio 3...

Page 75: ...Contents Uc 430 470 MHz ii 10 7 Transmitter Circuit 43 11 Schematic Diagram 44 12 Parts List 54 ...

Page 76: ...Push to Talk Key 13 LED Indicator 2 SK1 Side Key 1 14 Microphone 3 Antenna 15 Cancel Return Key 4 Speaker 16 Volume Right Key 5 LCD Display 17 Power On Off ESC Key 6 OK Menu Key 18 P3 Key 7 Up Key 19 Down Key 8 Volume Left Key 20 Charging Data Connector 9 Call Key 21 Earpiece Connector ...

Page 77: ...Product Controls Uc 430 470 MHz 2 No Part Name No Part Name 10 P1 Key 22 Battery Cover Open up 11 P2 Key 23 Battery Cover 12 Strap Hole ...

Page 78: ... radio To assemble the radio do vice versa Caution Please position the waterproof ring properly during reassembly Use the thumb and index finger to move the silicon rubber of SK1 key until SK1 key is well assembled Step 1 To remove the battery do as follows Step 2 Remove the chassis Remove the four T6 screws and take out the chassis ...

Page 79: ...emove the main board 1 First unplug the speaker connector and Keypad FPC connector and then remove the one T6 screw 2 Take out the main board in the direction shown in the figure below Step 4 Remove the keypad board 3 Remove the two screws on the back ...

Page 80: ...470 MHz Disassembly and Assembly 5 4 Remove the keypad board Step 5 Remove the LCD display 5 Straighten the two fixing plates securing the LCD display See the figure below 6 Take out the LCD display vertically ...

Page 81: ...sembly and Assembly Uc 430 470 MHz 6 Step 6 Remove the aluminum chassis shielding cover 7 Remove the three screws securing the aluminum chassis shielding cover 8 Take out the aluminum chassis shielding cover ...

Page 82: ...000000 Conductive sponge for aluminum chassis 1 29 6002124000000 Micro USB cover 1 5 7400656000000 Earpiece PC sheet 1 30 6002126000000 Front case 1 6 PCB main board 1 31 7500717000000 Motor PORON 1 7 7500724000000 LCD PORON pad 1 32 6002128000000 Antenna cover 1 8 7102002500000 Machine screw M2 0x2 5mm 2 33 6101008000000 Transparent silicon rubber light guide 1 9 7500376000010 Conductive sponge f...

Page 83: ...000030 Microphone 1 18 7500748000000 Double sided adhesive tape for LCD lens 1 43 6300253000000 Aluminum chassis shielding cover 1 19 6101009000000 P R keypad 1 44 6101018100000 Silicon rubber pad for battery 4 20 6002125000000 LCD lens 1 45 6101059100000 Silicone rubber plug for RF test port 1 21 6203685000000 Decoration sheet left side 1 46 6101023100000 Main waterproof ring 1 22 6002110000000 P...

Page 84: ...Uc 430 470 MHz Exploded View and Packaging Guide 9 3 2 Packaging Guide ...

Page 85: ...rating Temperature 30 C to 60 C Dimensions H W D with standard battery without antenna 106 mm 57 mm 23 mm Weight with antenna standard battery About 180 g Frequency Stability 0 5 ppm Receiver Sensitivity Analog 0 28 μV 12 dB SINAD 0 22 μV Typical 12 dB SINAD 0 22 μV 20 dB SINAD Digital 116 dBm BER5 Adjacent Channel Selectivity TIA 603 60 dB 12 5 kHz 70 dB 25 kHz ETSI 60 dB 12 5 kHz 70 dB 25 kHz In...

Page 86: ...to change without notice due to continuous development Rated Audio Power Output 0 4 W 8 Ω load Rated Audio Distortion 5 Transmitter Power Output 3 W 1 5 W Conducted Radiated Emission 36 dBm 1 GHz 30 dBm 1 GHz Modulation Limiting 2 5 kHz 12 5 kHz 5 0 kHz 25 kHz FM Noise 40 dB 12 5 kHz 45 dB 25 kHz Audio Distortion 3 ...

Page 87: ...e adjust BEEP 3V0A BAT T R SW CVread BIAS_DOWN RSSI PTT 12MHZ OPT_SEL R G RESET 3V3D W N EEPROM 24FC512 I SM I2C 3V3D 3V0D 1V2 LOR LOL IN3R IN1L HPL IN2L AF_MUTE AF_MUTE USART port VOX VOX EXT_interface ext_mic ext_spk V_CHARGER LCD LCD_RSTB LCD_CSB LCD_SDA LCD_SCLK A0 5 1 1 Power Supply Module Diagram of Power Control The power supply employs a single 3 7V li ion battery The RF section uses LDO t...

Page 88: ...34673 CHG VBUS PPP After inserted the charger wake up the walky talky Read charger status Detect charger inserted EM6M2 EM6M2 3V_TX_RF 3V_RX_RF TEM LEV DET TC TX_EN RX_EN To SCT 3928 U203 Security Key crystal Codec To LED To SCT3928 To_ EEPROM To MCU To Codec LDOIN RESET To Mic amp RESET R3112Q271A POWER_KEY POWER_KEY To keypad hardware connectted DC2DC_ CTRL To VCO To FAST LOCK VCC_VC_ TCXO 3V0_F...

Page 89: ...e radio powers RQ After power on PWR_ON goes to high level and PWR KEY_DET goes to low level During power off POWER_KEY is at low level while PWR KEY_DET is at high level The system detects power off procedure via PWR KEY_DET and implements the power off procedure Then PWR_ON and POWER_ON go to low level and the power is cut off ...

Page 90: ...S0DO S0DI S1CLK S1FS S1DO S1DI CLKIN SCL SDA FLASH_CLK FLASH_CE FLASH_DI FLASH_DO MCU PLL_CLK PLL_STB PLL_ DATA PLL_LD SQL RSSI BAT_DET APC TV ADJ_CRY Volume adjust T R SW CVread BIAS_DOWN RSSI PTT 12MHZ OPT_SEL R G RESET 3V3D W N EEPROM 24FC512 I SM I2C 3V3D 3V0D 1V2 AF_ MUTE USART port VOX EXT_ interface ext_mic ext_spk V_ CHARGER LCD LCD_RSTB LCD_CSB LCD_SDA LCD_SCLK A0 ...

Page 91: ...320AIC3204 The audio amplifier uses MAX9716EUA The diagram is as follows CODEC TLV320AIC3204 AMP MAX9716EUA MCLK BCLK WCLK DIN DOUT MCLK VDD3V3 12 288MHZ SCL SDA Security Key I2S VOICE CODER Protoccol Stack 4FSK FM Demod Channel Selection SCT3928 S0CLK S0FS S0DO S0DI S1CLK S1FS S1DO S1DI CLKIN SCL SDA FLASH_CLK FLASH_CE FLASH_DI FLASH_DO MOD_VCO MOD_REF AFDET BEEP 3V0A BAT 3V0D 1V2 LOR LOL R IN3R ...

Page 92: ...gnal is sent to TLV320AIC3204 via I2S interface for DA conversion and amplifying Finally the audio signal is output to FGU for two path modulation via the LOL R port of TLV320AIC3204 External Connector Earpiece connector Ф2 5mm standard earpiece connector for specific earpiece USB port It is used for battery charging and programming Audio Amplifier Main parameters of MAX9716EUA are listed in the t...

Page 93: ... pre driver amplifier 2SC3356 for prH amplification allowing DQ interstage isolation between the pre driver amplifier and the next amplifier Then the signal goes to another pre driver amplifier BFQ540 and the driver amplifier 2SK3078 for further power amplification to provide DGHTXDWHO DPSOLILHG signal to the final stage amplifier RFM03U3CT for final power amplification After amplified by multiple...

Page 94: ...tion 12 5kHz 18dBc 25kHz 40dBc 2 2nd IF 85dBc Vdd 3Vdc Input level 99dBm 2nd Lo Vdd 3Vdc Frequency 38 4MHz Current Drain 2mA output level 22dBm Pi Attenuator Lo input level 7dBm IL 0 5dB Zin Zout 50R Attenuator Protect RB706F 3Vdc Double Circuit 2SC5108 3VFGU VCTCXO 19 2MHz BA4116FV AF OUT Receiver Front end The HF signal from the low pass filter passes through the electrically tunable first stage...

Page 95: ...r out the spurious signal before the second IF signal is amplified and frequency discriminated Then the first IF signal will be processed internally and demodulated Finally the demodulated signals will be sent to the baseband section for audio processing 5 2 3 Frequency Generation Unit FGU The FGU composed of VCO and PLL is the core module of the whole TX RX system This unit provides accurate carr...

Page 96: ...e and then uses the control signals VCC_VCO_L and VCC_VCO_H to switch operating status VCO_L is used for receiving while VCO_H is used for transmitting Two point Modulation In TX mode the two point modulation is employed to obtain higher modulation accuracy and lower 4FSK bit error rate MOD_VCO and MOD_REF send the modulation signal to the modulation end of VCO and the reference crystal oscillator...

Page 97: ... and its connection are normal The power supply of LCD is normal No Check U307 The LCD clock reset and data signals are normal Check whether the LCD and its connection are normal No MCU power supply and clock are normal No Check whether X100 crystal oscillator and U302 are normal MCU reset signal 14 pin is normal Check U103 1V2D 3V0D 3VRT and 3VFGU are normal No Check U300 U302 U306 and U304 Yes 1...

Page 98: ... CODEC audio input AF_IN is normal No Refer to receiver circuit for repairing information 3V0D and 3V0A are generated normally Check U301 U302 Yes CODEC Reset is normal Yes U802 is abnormal or damaged No Check D8005 and MCU No Check MCU Does CODEC send data to SCT3928 SIDI signal CODEC is abnormal or damaged No Yes Does SCT3928 send data back to CODEC SIDO signal CODEC is abnormal or damaged No No...

Page 99: ...04 is normal Refer to FGU diagram for repairing information No Check whether U401 works normally No Yes Completed Does CODEC send data to SCT3928 SIDI signal CODEC is abnormal or damaged No Yes Does SCT3928 send data back to CODEC SIDO signal CODEC is abnormal or damaged No No MCU controls SCT3928 normally SCT3928 is abnormal or damaged Yes Yes CODEC power supply and reset signals are normal Check...

Page 100: ... The static working point of Q6005 is normal 3 Yes Completed No 3VRT outputs normally 2 Check Q6006 Check Q611 and peripheral components Check X8001 and related components 19 2 MHz is normal 7 The static working point of Q6006 is normal 4 LNA_Out output is normal 8 Check Q6005 and front end RF circuit LO signal output is normal 9 RX_LO output is normal 10 First IF output is normal 11 Check Z6001 Q...

Page 101: ...gnal at C6094 to test IF sensitivity Normally the IF sensitivity is 109dBm 6 Frequency of Q611 is 38 4 MHz output by C697 7 Frequency output by 2NDLO_1 is 19 2 MHz 8 Input a 40dBm RF signal at the antenna connector and test at R6047 Normally gain is higher than 10 dB and output signal is stronger than 30 dBm 9 Test at C6093 the post stage circuit has not been cut off Normally the frequency is 38 8...

Page 102: ...ace Q6008 Check the power supply circuit Power level is normal 6 D8021 RF connector and the low pass network are normal 7 Match network is normal 8 Q404 and Q406 work normally 9 Q405 works normally 10 Q606 works normally 11 Check the output circuit of FGU Power level is normal Power level is normal Power level is normal Power level is normal Repair damaged components Repair damaged components Powe...

Page 103: ...t 0 7 V The low pass coil must be soldered appropriately and remain in good condition The RF connector must remain in good condition 8 The match components must be soldered appropriately and remain in good condition 9 Vdd is about 3 7 V for low power Vgg is 1 2 to 1 4 V for high power Vgg is 1 4 to 1 6 V 10 Vdd is about 3 7 V for low power Vgg is 1 2 to 1 4 V for high power Vgg is 1 4 to 1 6 V 11 ...

Page 104: ...8 and peripheral components Replace Q8004 and Q8008 Replace L8018 and L8045 L8018 and L8045 are normal 4 Feedback is output Check the feedback circuit 19 2MHz crystal oscillates Check the 19 2MHz circuit Sky72310 clock is normal 6 Check the data control circuit of Sky72310 Check Q8007 Q8010 and peripheral components No Signal Amplitude is normal 7 8 Check the data control circuit of Sky72310 Descr...

Page 105: ...le E the voltage is about 2 6 V at pole C of Q8007 about 0 84 V at pole B and about 0 12 V at pole E 6 PLL_Clk outputs 960 kHz clock 7 During receipt D501 is off and D502 is on the positive pole voltage is about 1 02 V during transmission D501 is on and D502 is off the positive pole is at a voltage of about 1 02 V 8 During normal operation when there is no load connected to the post stage of C8072...

Page 106: ...430 470 MHz Interface Definition 31 7 Interface Definition The definition of each pin is described as below Interface Pin No Signal Function J5004 1 VBUS 2 RXD1 3 TXD1 4 TD_IO 5 GND J800 1 SPK 2 MIC 3 GND ...

Page 107: ...e Tuner software and go to TUNE_DATA TX Reference Oscillator Warp in the left navigation tree Then click the Transmit On button 3 Observe the frequency displayed on HP8921 and adjust the vernier until the frequency offset is less than or equals to 40 Hz 4 Click the Transmit Off button Transmit Power Calibration Here takes the TX low power tuning for example 1 Connect the antenna connector of the r...

Page 108: ...n is 4 3k 50 Hz 5 Click the Transmit Off button Modulation Balance 1 Connect the antenna connector of the radio to HP8921 and set HP8921 to TX test mode 2 Set the HP8921 parameters as follows IF Filter 230 kHz Filter1 20 Hz HPF Filter2 15 kHz LPF De Emphasis OFF AFGen1 Freq OFF AFGen Lv1 15 5 mV 3 Open the Tuner software and go to TUNE_DATA TX Modulation Balance in the left navigation tree Then se...

Page 109: ...epeat Step 3 to Step 13 RX Section Front end Filter 1 Connect the antenna connector of the radio to HP8921 2 Connect the Audio Out port of the radio to the Audio In port of HP8921 and set HP8921 to RX test mode 3 Set the HP8921 parameters as follows Output RF signal 118 dBm Frequency Modulation frequency 1 kHz Modulation deviation 3 kHz De Emphasis 750 us 4 Observe the value displayed on the HP892...

Page 110: ...uency to be tested STD IB 511 153 Step 4 Click the Transmit On button Step 5 View all the tested items on the Aeroflex 3920 and make sure they satisfy the following requirements Frequency Error 100 Hz Transmit Power 2 5 0 2 W FSK Error 5 Magnitude Error 1 Receiving Step 1 Open the Tuner software and go to TEST RX Receiver BER 0 153 Step 2 Select the frequency to be tested Step 3 Set the Aeroflex 3...

Page 111: ...9 PCB View Main Board_Top Layer 35 ...

Page 112: ...Main Board_Bottom Layer 36 ...

Page 113: ...928 MCU STM32F100VD SPI McBSP2 McBSP1 MPUIO GPIOs SPI IIS USB SPI3 GPIOs Mic preamp Audio preamp MCLK 19 2MHz FGU module RF Control RF Unit MCSI1 HPI CS3 GPIOs MCLK 12 0MHz XTAL UART3 UART2 I2C1 GPIOs JTAG AUDIO AMP I2C LCD HPI HPI IIS SPI2 Security Key UART1 Key Board GPIOs MCLK I2C I2C IIS TX module RX module Tx Rx Switch ANT AF_IN MOD_REF MOD_VCO ...

Page 114: ...ter 3V0A_FGU_PLL PLL_CLK PLL_STB PLL_DATA PLL_LD RX VCO TX VCO LNA AT41511 IF AMP 2SC5108 LPF 3VFGU LPF Tuning Filter1 Attenuator Protect RB706F 38 85MHZ RFM03U3CT HSMS 2827 Double Circuit 2SC5108 38 4MHz MOD_REF SQL RSSI BAT PreDriver 2 Match PreDriver 1 2SK3078 2SC3356 SW CHARGE FGU PRE_FlOCK FL_FLOCK 450KHZ G IF Filter AFDET SQL RSSI BFQ540 Match Balun Balun VCO_L H_En 3V_TX_RF 3V_TX_RF 3V_TX_R...

Page 115: ... S0FS S0DO S0DI S1CLK S1FS S1DO S1DI CLKIN SCL SDA FLASH_CLK FLASH_CE FLASH_DI FLASH_DO MCU PLL_CLK PLL_STB PLL_DATA PLL_LD MOD_VCO MOD_REF AFDET SQL RSSI BAT_DET APC TV ADJ_CRY Volume adjust BEEP 3V0A BAT T R SW CVread BIAS_DOWN RSSI PTT 12MHZ OPT_SEL R G RESET 3V3D W N EEPROM 24FC512 I SM I2C 3V3D 3V0D 1V2 LOR LOL IN3R IN1L HPL IN2L AF_MUTE AF_MUTE USART port VOX VOX EXT_interface ext_mic ext_sp...

Page 116: ...09 U608 CHARGER MC34673 CHG VBUS PPP After inserted the charger wake up the walky talky Read charger status Detect charger inserted EM6M2 EM6M2 3V_TX_RF 3V_RX_RF TEM LEV DET TC TX_EN RX_EN To SCT 3928 U203 Security Key crystal Codec To LED To SCT3928 To_ EEPROM To MCU To Codec LDOIN RESET To Mic amp RESET R3112Q271A POWER_KEY POWER_KEY To keypad hardware connectted DC2DC_ CTRL To VCO To FAST LOCK ...

Page 117: ...8 Gain 5dB isolation 20dB Current 4mA 2SC3356 Gain 10dB isolation 15dB Current 10mA 3dB BW 3 5K Phase Margin 30 55 A 0 1Vpp 2 0Vpp S21 3dB Fpass 500MHz Fstop 800MHz Astop 40dB Kv 30MHz V CV 0 8 2 3V F 361 15 401 15MHz PN 116dBc Hz 12 5KHz Kv 30MHz V CV 0 8 2 3V F 400 440MHz PN 116dBc Hz 12 5KHz 3 0v for core Vp Compare frequence 4 8MHz Prescaler Level 50 250mVpp Pi Attenuator isolation 1dB FGU Clo...

Page 118: ...ass Filter BA4116 BPF1 Low Noise Amp AT 41511 BPF2 Mixer HSMS 2827 IF Filter 38 85MHz IF Processor IF Amp 2SC5108 ANT LPF Tuned Voltage Lo OSC Lo Amp 2SC3356 Pi Attenuator Double Circuit 2SC5108 VC TCXO 19 2MHz T R SW 10 6 Receiver Circuit ...

Page 119: ...TT I V convertor APC module 1 attack time and decay time is less than 1 5 mS 2 close gain rate Ga is large than 20 value Gain 15 dB Po 1dB 5 dB mstatic Ic 12 mA S a m p l i n g r e s i s t o r Pre Driver 2 Drive stage Final stage Low pass Filter Pre Driver 1 PA match Tx Rx Switch 2SC3356 BFQ 540 2SK3078 RFM03U3CT T 3 V APC From TV To RX TxVCO 3 V 2SC3356 2SC5108 T R T R T R 10 dB Gain 15 dB Po 1dB...

Page 120: ... HD108 HD105 HD105 R126 47k R126 47k R134 4 7k R134 4 7k R113 NC R113 NC C148 470p C148 470p HD109 HD109 R177 100 R177 100 HD106 HD106 R173 100 R173 100 D101 R_LED D101 R_LED R167 100 R167 100 C117 0 1u C117 0 1u SW103 PTT SW103 PTT 1 2 3 4 RN112 100 4 RN112 100 4 1 2 3 4 5 6 7 8 HD103 HD103 R158 100 R158 100 TP104 SK1 TP104 SK1 C127 0 1u C127 0 1u R100 10k R100 10k R154 100 R154 100 C122 0 1u C12...

Page 121: ...R225 NC R220 10 R220 10 C239 470p C239 470p C255 470p C255 470p C224 0 1u C224 0 1u R201 33 R201 33 R202 1K R202 1K C212 33p C212 33p C240 0 1u C240 0 1u C262 0 1u C262 0 1u C256 0 1u C256 0 1u C270 4700p C270 4700p R216 33 R216 33 C210 NC C210 NC C260 0 1u C260 0 1u TP202 M_REF TP202 M_REF 1 C259 470p C259 470p X200 12 288MHz X200 12 288MHz 1 2 3 4 R229 4 7k R229 4 7k C221 0 1u C221 0 1u C249 470...

Page 122: ...5 22K R308 100k R308 100k D806 CP64002T D806 CP64002T TP108 POWERON TP108 POWERON 1 TP303 TP303 1 C302 470p C302 470p C314 0 22u C314 0 22u C327 22uF C327 22uF 1 2 C334 4 7u C334 4 7u C306 0 1u C306 0 1u C145 100p C145 100p U309 XC6118N28AMR G U309 XC6118N28AMR G VOUT 1 VSS 2 VIN 3 VSEN 4 Cd NC 5 R620 NC R620 NC C315 470p C315 470p C632 1000p C632 1000p C333 0 1u C333 0 1u R634 150K R634 150K C331...

Page 123: ...D5V0S1UB 1 2 R814 22k R814 22k C419 1uF C419 1uF C817 0 1u C817 0 1u C417 22p C417 22p C431 470p C431 470p D406 EDZ6 8B D406 EDZ6 8B 1 2 C820 NC C820 NC R422 2 2K R422 2 2K C801 0 1u C801 0 1u R817 2 2k R817 2 2k D800 EDZ6 8B D800 EDZ6 8B 1 2 L405 BLM15PD121SN1 L405 BLM15PD121SN1 L401 BLM15PD121SN1 L401 BLM15PD121SN1 C819 33p C819 33p CN1 BM02B SURS TF CN1 BM02B SURS TF 1 2 3 4 C804 1000p C804 100...

Page 124: ...50KGFA R0 Z601 CFWKA450KGFA R0 2 1 3 4 Q618 DTA114YE Q618 DTA114YE 3 1 2 C716 0 1uF C716 0 1uF R693 3 3k R693 3 3k R718 NC R718 NC C715 1000p C715 1000p C783 0 1u C783 0 1u C759 0 047uF C759 0 047uF R668 4 7 R668 4 7 C781 NC C781 NC C698 NC C698 NC U602 BA4116FV U602 BA4116FV OSC IN 1 OSC OUT 2 MIX OUT 3 VCC 4 IF IN 5 DEC 6 FIL OUT 7 FIL IN 8 AF OUT 9 QUAD 10 IF OUT 11 RSSI 12 N DET 13 N REC 14 GN...

Page 125: ... 6 1 2 4 3 5 R6047 0 R6047 0 R6044 NC R6044 NC R6028 100k R6028 100k C8117 470p C8117 470p C707 4pF C707 4pF L6023 4T L6023 4T C6063 6pF C6063 6pF RP1 RF RP1 RF 1 C703 2 7p C703 2 7p C6098 9pF C6098 9pF L6016 330nH L6016 330nH C6078 NC C6078 NC C6100 9pF C6100 9pF R8080 12K R8080 12K C6053 470p C6053 470p L6017 22nH L6017 22nH C6101 15p C6101 15p T6001 4BMH T6001 4BMH 6 1 2 4 3 5 R6030 330 R6030 3...

Page 126: ... R7006 NC C7019 470p C7019 470p R7046 NC R7046 NC R7045 NC R7045 NC R7049 1K R7049 1K C7002 470p C7002 470p R7014 82K R7014 82K R7056 0 1R R7056 0 1R R7048 0 R7048 0 R7009 1M R7009 1M R7017 1 8M R7017 1 8M R7013 390K R7013 390K R7023 NC R7023 NC Q7010 EM6M2 Q7010 EM6M2 6 2 1 4 5 3 D7003 NC D7003 NC 1 2 R7007 NC R7007 NC R7004 1 8M R7004 1 8M R7008 NC R7008 NC C7007 NC C7007 NC C7015 NC C7015 NC R7...

Page 127: ... C7053 4P C7067 NC C7067 NC C7041 2 4pF C7041 2 4pF C7034 2 4p C7034 2 4p Q7004 2SC3356 Q7004 2SC3356 2 3 1 C481 20P C481 20P C626 NC C626 NC R672 47k R672 47k R630 47k R630 47k C7035 6P C7035 6P R667 NC R667 NC C640 100pF C640 100pF C642 20P C642 20P RP2 RF_SW RP2 RF_SW 1 J102 SPC0200A1 003 SPA5G 50 J102 SPC0200A1 003 SPA5G 50 1 1 2 2 3 3 4 4 5 5 6 6 C7033 3 6P C7033 3 6P L7005 5 6nH L7005 5 6nH ...

Page 128: ...0p R8025 1k R8025 1k C8036 220p C8036 220p C577 560P C577 560P Q8009 EM6M2 Q8009 EM6M2 6 2 1 4 5 3 C8020 0 1u C8020 0 1u L8007 BLM15PD121SN1 L8007 BLM15PD121SN1 1 2 C8037 220p C8037 220p C8011 0 1u C8011 0 1u C8034 1000p C8034 1000p U8002 TS5A3159DCKR U8002 TS5A3159DCKR NO 1 NC 3 GND 2 Vcc 5 IN 6 COM 4 C8008 0 1u C8008 0 1u D8001 1SS390D8001 1SS390 1 2 R8011 10 R8011 10 R8019 120 R8019 120 R8010 1...

Page 129: ...641 3 3k R641 3 3k C8122 0 1u C8122 0 1u Q8010 2SC5108 Q8010 2SC5108 1 3 2 R8053 1K R8053 1K C8136 18pF C8136 18pF L8053 390nH L8053 390nH L8020 16nH L8020 16nH C507 7p C507 7p C8113 560p C8113 560p C8120 470p C8120 470p C8076 5pF C8076 5pF C503 4pF C503 4pF D8008 DAN222 D8008 DAN222 1 2 3 L8025 390nH L8025 390nH C8097 0 1u C8097 0 1u L8027 33nH L8027 33nH R637 3 3k R637 3 3k L113 47nH L113 47nH C...

Page 130: ...4 C122 B1A 3101011040080 0 1uF 488 J5004 T1B 5208005000030 USB connector 15 C123 B1A 3101011040080 0 1uF 489 J800 T1D 5205006000010 Earpiece Connector 16 C124 B1G 3101011040080 0 1uF 490 L100 B1G 3221505121010 BLM15PD121SN1 D 17 C125 B3G 3101011040080 0 1uF 491 L101 B2I 3221505121010 BLM15PD121SN1 D 18 C126 B3I 3101011040080 0 1uF 492 L102 B1I 3221505121010 BLM15PD121SN1 D 19 C127 B2G 310101104008...

Page 131: ...1011040080 0 1uF 522 L6017 T3C 3210306220000 Chip inductor 22nH 49 C157 B1F 3101011010030 100PF 523 L6018 T3A 3001060000000 0Ω 50 C160 T1F 3101014710010 470PF 524 L6021 T3C 3210306220000 Chip inductor 22nH 51 C201 T3I 3101011040080 0 1uF 525 L6022 T3C 3239999190000 Air core coil 19nH 52 C202 B3I 3101071060010 10UF 526 L6023 T3D 3239999190000 Air core coil 19nH 53 C203 T3I 3101061050060 1UF 527 L60...

Page 132: ... 470PF 557 L7905 T3A 3239999190000 Air core coil 19nH 84 C236 T2I 3101011040080 0 1uF 558 L7908 T2A 3001060000000 0Ω 85 C237 T2I 3101014710010 470PF 559 L8001 B3H 3001051000000 10Ω 86 C238 T2I 3101011040080 0 1uF 560 L8002 B4G 3221505121010 BLM15PD121SN1 D 87 C239 T2I 3101014710010 470PF 561 L8003 B3H 3221505121010 BLM15PD121SN1 D 88 C240 T2I 3101011040080 0 1uF 562 L8004 B4H 3221505121010 BLM15PD...

Page 133: ... N MOSFET 121 C305 T2H 3101062250200 2 2UF 595 Q6004 T1E 3403999000070 Compound transistor 122 C306 T3H 3101011040080 0 1uF 596 Q6005 T3C 3418001000010 NPN transistor 123 C307 T3H 3101012710010 270pF 597 Q6006 T3E 3401002000990 NPN transistor 124 C308 T1G 3101014710010 470PF 598 Q6008 T1E 3403999000070 Compound transistor 125 C309 T1H 3101074750010 4 7UF 599 Q606 T2E 3420999000060 NPN transistor 1...

Page 134: ...65 C350 T1F 3101011040080 0 1uF 639 R126 B1H 3001014730010 47KΩ 166 C352 B3I 3101051050160 1uF 640 R127 B3H 3001011010080 100Ω 167 C413 B2B 3101011040080 0 1uF 641 R128 T2G 3001014720050 4 7KΩ 168 C415 B2B 3101011020060 1000pF 642 R129 T2G 3001014720050 4 7KΩ 169 C416 B2C 3101014710010 470PF 643 R130 T2G 3001014700000 47Ω 170 C417 B2C 3101012200020 22PF 644 R131 T2G 3001014700000 47Ω 171 C418 B2C ...

Page 135: ...72 T3B 3101058290080 8 2PF 692 R182 B2G 3001011010080 100Ω 219 C6073 T3B 3101050600010 6PF 693 R183 B2G 3001011010080 100Ω 220 C6081 T4A 3101014710010 470PF 694 R184 B2G 3001011010080 100Ω 221 C6082 T4B 3101011030050 0 01uF 695 R185 B2G 3001011010080 100Ω 222 C6083 T3D 3101014710010 470PF 696 R186 B1F 3001011010080 100Ω 223 C6084 T2E 3101012230010 0 022uF 697 R187 B3I 3001011010080 100Ω 224 C6085 ...

Page 136: ...0130 470pF 745 R466 T4H 3001051030050 10KΩ 272 C692 T2G 3101011030050 0 01uF 746 R467 T4H 3001051020000 1KΩ 273 C693 T2G 3101011040080 0 1uF 747 R482 B3H 3001050000000 0Ω 274 C694 T2G 3101011040080 0 1uF 748 R483 B3H 3001058210000 820Ω 275 C697 T2G 3101051010030 100PF 749 R6018 T3D 3001063300000 33Ω 276 C700 T3G 3101053000010 30PF 750 R6019 T1E 3001058230000 82KΩ 277 C7002 B3C 3101014710010 470PF ...

Page 137: ...01053310000 330Ω 325 C730 T2F 3101056800000 68PF 799 R7009 B3C 3001051050000 1MΩ 326 C737 T2F 3101011030050 0 01uF 800 R7010 B3C 3001058230000 82KΩ 327 C738 T3F 3101011030050 0 01uF 801 R7013 B3C 3001053940010 390KΩ 328 C759 T2F 3101054730000 0 047UF 802 R7014 B3D 3001018230000 82KΩ 329 C762 T3F 3101011040080 0 1uF 803 R7015 B3C 3001055640020 560KΩ 330 C783 T2F 3101011040080 0 1uF 804 R7017 B3C 30...

Page 138: ...G 3101011040080 0 1uF 851 R8025 B3G 3001011020060 1KΩ 378 C8067 T3G 3101014710010 470PF 852 R803 B2B 3001052040010 200kΩ 379 C8068 T3G 3101014710010 470PF 853 R804 B2C 3001011020060 1KΩ 380 C807 B2D 3101011040080 0 1uF 854 R8040 B3G 3001018230000 82KΩ 381 C8070 T3G 3101014710010 470PF 855 R8046 T3G 3001013320000 3 3KΩ 382 C8071 T3G 3101011040080 0 1uF 856 R8047 T3F 3001018230000 82KΩ 383 C8072 T4G...

Page 139: ...14720050 4 7KΩ 428 C8135 T4H 3101050300000 3PF 902 R816 B2D 3001051050000 1MΩ 429 C8136 T4H 3101051800010 18PF 903 R817 B2C 3001012220010 2 2KΩ 430 C8137 T4H 3101060400010 4PF 904 R818 B2D 3001014720050 4 7KΩ 431 C8138 T4G 3101054700010 47PF 905 R819 B2C 3001011040030 100KΩ 432 C8142 T4H 3101054710130 470pF 906 R820 B3I 3001014720050 4 7KΩ 433 C8143 T4H 3101062290040 2 2pF 907 RN102 B2I 3005051010...

Page 140: ...D800 T1A 3101052700000 27PF 934 U401 B2C 3605008005070 Operational Amplifier 461 D8001 B3G 3303030800020 Switching diode 935 U602 T2F 3603018000000 IF processor IC 462 D8002 B3H 3301990000030 Schottky barrier diode 936 U608 B1A 3615042000010 Charging IC 463 D8003 B3H 3301990000030 Schottky barrier diode 937 U7001 B3C 3605025000050 Operational Amplifier 464 D8004 B3H 3301990000030 Schottky barrier ...

Page 141: ...1616300000330 10 2014 L07157 2014 Hytera Communications Corporation Limited Hytera Communications Corporation Limited ...

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