Hytera PD405 Service Manual
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Hytera PD405 Service Manual

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PD405
Digital Portable Radio
SERVICE MANUAL

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  • Page 1 PD405 Digital Portable Radio SERVICE MANUAL...
  • Page 3 Preface This manual describes the information related to the 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: PD40X Digital Portable Radio (X may represent 2, 5, 6 or 8)
  • Page 4 Copyright Information Hytera is the trademark or registered trademark of Hytera Communications Corporation Limited (the Company) in PRC and/or other countries or areas. The Company retains the ownership of its trademarks and product names. All other trademarks and/or product names that may be used in this manual are properties of their respective owners.
  • Page 5 Documentation Information Conventions Icon Conventions Icon Description Indicates information that can help you make better use of your product. Note Indicates references that can further describe the related topics. Caution Indicates situations that could cause data loss or equipment damage. Warning Indicates situations that could cause minor personal injury.
  • Page 6 VHF (136‐174 MHz)

  • Page 7: Table Of Contents

    VHF (136‐174 MHz) Contents Contents 1. Product Controls ..........................1 2. Disassembly and Assembly ........................ 2 3. Exploded View and Packing Guide ....................4 3.1 Exploded View ..........................4 3.2 Packing Guide ..........................6 4. Specifications ............................7 5. Circuit Descriptions ..........................9 5.1 Baseband Section..........................

  • Page 8: Product Controls

    VHF (136‐174 MHz) Product Controls 1. Product Controls Part Name Part Name ○ ○ PTT (Push-to-Talk) Key Accessory Connector ○ ○ SK1 (Side Key 1) Microphone ○ ○ SK2 (Side Key 2) Battery Latch ○ ○ Channel Selector Knob Antenna ○...

  • Page 9: Disassembly And Assembly

    VHF (136‐174 MHz) Disassembly and Assembly 2. Disassembly and Assembly This section is designed to introduce the way to disassemble the radio. To assemble the radio, do vice versa. Caution Position the waterproof ring into the radio properly during reassembly. ...
  • Page 10 VHF (136‐174 MHz) Disassembly and Assembly Step 4 Remove the two screws on the aluminum chassis. Step 5 Remove the aluminum chassis and the main board. Step 6 Remove the eight screws on the main board. Step 7 Unsolder the soldering joint of the antenna connector and remove the main board.

  • Page 11: Exploded View And Packing Guide

    VHF (136‐174 MHz) Exploded View and Packing Guide 3. Exploded View and Packing Guide Exploded View Parts list: Note For parts that are not marked with Part Number, their Part Numbers may vary with the frequency band. Part No. Description Qty.
  • Page 12 VHF (136‐174 MHz) Exploded View and Packing Guide Part No. Description Qty. Part No. Description Qty. M2.5*6.0 mm Waterproof Ring 5001210000720 Speaker 6100527100000 for Screw Main Waterproof 7400244000000 Speaker Pad 6101228000000 Ring Aluminum 6202121000000 Speaker Fixing Sheet 6300269000000 Chassis Waterproof Ring Self-tapping Screw 7101904020200 6101037000000...

  • Page 13: Packing Guide

    VHF (136‐174 MHz) Exploded View and Packing Guide Packing Guide...

  • Page 14: Specifications

    VHF (136‐174 MHz) Specifications 4. Specifications General Frequency Range 136‐174 MHz Channel Capacity Channel Spacing 25 kHz/12.5 kHz Operating Voltage 7.4 V (rated) Battery 1500 mAh Li-Ion battery Battery Life (5-5-90 Duty Cycle, High TX Power) Analog: about 12 h High-capacity 1800 mAh Li-Ion Battery Digital: about 16 h Operating Temperature...
  • Page 15 VHF (136‐174 MHz) Specifications Transmitter Power Output 5 W/1 W -36 dBm<1 GHz Spurious Emission -30 dBm>1 GHz  ±2.5 kHz @ 12.5 kHz Modulation Limiting  ±5.0 kHz @ 25 kHz  40 dB @ 12.5 kHz FM Noise ...

  • Page 16: Circuit Descriptions

    VHF (136‐174 MHz) Circuit Descriptions 5. Circuit Descriptions Baseband Section 5.1.1 Power Supply Module Diagram of Power Control The power supply employs a single cell 7.4 V Li-ion battery. The RF section uses LDO to generate a 5 V voltage for FGU and PLL circuits, as well as the control parts of TX circuits. The baseband section uses LDO to generate a 3.3 V voltage for Codec, MCU and SCT3928.

  • Page 17: Control Module

    HF ( MHz) Circuit Descriptions ‐ 5.1.2 Control Module The radio employs the STM32F101VET6(MCU)+SCT3928(Baseband IC) control solution. STM32F101VET6 is the main controller unit (MCU), while SCT3928 is the baseband processor chip, which is used for analog and digital modulation/demodulation, as well as digital voice encoding/decoding. MCU communicates with SCT3928 via HPI BUS and connects to 512K EEPROM via I2C BUS.

  • Page 18: Audio Module

    VHF (136‐174 MHz) Circuit Descriptions 5.1.3 Audio Module Audio Diagram The audio processing section uses SCT3928 and TLV320AIC3204. The audio amplifier uses TDA2822D. The diagram is as follows: These two signals go to FGU for This signal is down converted by modulation RX end and output by BA4116 3V0D...

  • Page 19: Rf Section

    MHz) Circuit Descriptions ‐ RF Section 5.2.1 Transmitter Circuit The transmitter circuit is mainly composed of:  RF Power Amplifier Circuit  Low-pass Filter Circuit (for suppressing harmonics)  Auto Power Control (APC) Circuit RF Power Amplifier Circuit The carrier signal (TX signal) generated by TX voltage controlled oscillator (VCO) is modulated and amplified via the buffer amplifier first, then passes through a pre-driver amplifier for primary power amplification.
  • Page 20 VHF (136‐174 MHz) Circuit Descriptions voltage via the sampling resistor and subtracter circuit (composed of the first operational amplifier). This voltage is compared with that of the APC circuit (output by DAC) at the second operational amplifier. Then the error voltage, which is output by the second operational amplifier, controls TX power by controlling the compensated gate bias voltage of the amplifiers (including the driver amplifier and the final-stage amplifier).

  • Page 21: Receiver Circuit

    VHF (136‐174 MHz) Circuit Descriptions 5.2.2 Receiver Circuit The receiver circuit is mainly composed of RF band-pass filter, low-noise amplifier, mixer, IF filter, IF amplifier and IF processor. S21≤1.5dB Ripple Inband≤ 1dB Stop band attenuation: -30dBc 3V3FGU 3V3dc Lo Amp Low-Noise Amp Lo input level≥7dBm 2SC3356...

  • Page 22: Frequency Generation Unit (Fgu)

    VHF (136‐174 MHz) Circuit Descriptions Receiver Back-end The processed first IF signal is sent to IC BA4116 for second mixing with the second harmonic signal (selected as the second LO signal) of the PLL crystal to get the 450 kHz second IF signal. Then the first IF signal passes through the 450 kHz ceramic filter which filters out the spurious signal before the second IF signal is amplified and frequency-discriminated.
  • Page 23 VHF (136‐174 MHz) Circuit Descriptions VC_TXCO Mod_2 Fc=19.2MHz A=0.1Vpp~2.0Vpp PLL Sky72310 RF feedback LPF 3.0v for core&Vp FGU Close Loop: Compare frequence:4.8MHz Prescaler Level：50~250mVpp S21=-3dB PN: ≤-80 (dBc/Hz)@1KHz Fpass=500MHz PN: ≤-112 (dBc/Hz)@12.5KHz Fstop=800MHz PN: ≤-120 (dBc/Hz)@25KHz Astop=40dB PN: ≤-136 (dBc/Hz)@100KHz PN: ≤-145 (dBc/Hz)@1MHz Two Point modulation：...

  • Page 24: Troubleshooting Flow Chart

    VHF (136‐174 MHz) Troubleshooting Flow Chart 6. Troubleshooting Flow Chart Control Circuit Check the control circuit Power-on indication is The RF circuit is driven The control circuit normal?[1] normally?[2] is normal. Verify RF power supply circuit (including U302, U303, U306 and U310) and control circuit.

  • Page 25: Receiver Circuit

    VHF (136‐174 MHz) Troubleshooting Flow Chart Receiver Circuit No Receiving Output of Output of 3V3A_RX is 3V3_RX_RF is Check U306 normal?[2] normal?[1] Check Q601 Quiescent operating point of Check Q602 Q602 is normal?[3] Quiescent operating point of Check Q604 Q604 is normal?[4] Input IF signal at Check Z601 to test whether...
  • Page 26 VHF (136‐174 MHz) Troubleshooting Flow Chart Descriptions of normal situation: [1] Output voltage by Q601 Pin 3 is about 3.3 V. [2] Output voltage by U306 Pin 5 or input voltage by Q601 Pin 4 is about 3.3V. [3] Check the collector voltage and base voltage of Q602 when the radio is not receiving. Normally, the base voltage is about 0.7 V, the collector voltage is about 2.7 V and the emitter voltage is 0 V.

  • Page 27: Transmitter Circuit

    VHF (136 - 174 MHz) Troubleshooting Flow Chart Transmitter Circuit Caution The following tests must be performed under the 7.4 V power supply. No Power Output Power supply Check power supply is normal?[1] circuit TV/APC is Check DAC VGG is normal?[2] normal?[3] output circuit Check 5VRT...
  • Page 28 VHF (136‐174 MHz) Troubleshooting Flow Chart Descriptions of normal situation: [1] Voltage of the power supply is about 7.4 V. [2] For low power, VGG is 1.8 to 2.1 V; for high power, VGG is 2.4 to 2.8 V. [3] For low power, TV/APC is 1 to 1.3 V; for high power, TV/APC is 1.8 to 2.1 V. [4] TX_En is about 3.3 V.

  • Page 29: Fgu Circuit

    VHF (136‐174 MHz) Troubleshooting Flow Chart FGU Circuit Check FGU circuit Check the 5VFGU, VCC_VCO, power supply 3V3_FGU and circuit 3V3A_FGU_PLL are normal? Q1002, Q1004, Q1005, Replace Q1001 Q1001 and Q1010 are Does VCO oscillate? Q1011 and Q901 are and Q1010 normal?[2] normal?[1] Replace Q1002,...
  • Page 30 VHF (136‐174 MHz) Troubleshooting Flow Chart Descriptions of normal situation: [1] When the radio is transmitting, output voltage by Q1002 Pin 3 is about 4.2 V. When the radio is receiving, output voltage by Q1004 Pin 3 is about 4.2 V. [2] When the radio is transmitting, the emitter voltage, collector voltage and base voltage of Q1010 are about 1.8 V, about 4.18 V and about 2.6 V respectively.

  • Page 31: Interface Definition

    VHF (136‐174 MHz) Interface Definition 7. Interface Definition Descriptions on J401 and J402 double-pin interface for earpiece, programming and downloading are listed below. Interface Pin No. Signal Illustration SPK- TXD+ J401 SPK+ SPK+ SPK- J402 RXD- OPTEL1...

  • Page 32: Tuning Description

    VHF (136‐174 MHz) Tuning Description 8. Tuning Description Required Test Instruments  Radio communication test sets: Aeroflex 3920 and HP8921  Power supply: 3 A/10 V  Multimeter  Tuner software Tuning Procedures 8.2.1 Tuning the Radio After re-assembling the radio, you need to tune it with the Tuner software. Note The items to be tuned and tuning operations are described in the table below.
  • Page 33 VHF (136‐174 MHz) Tuning Description Item Method Click the “Transmit On” button on Tuner. Adjust the power to the required level as follows: L: 1.2±0.1 W Connect the antenna connector of the radio to the RF port of HP8921, and set HP8921 to TX test mode. Set HP8921 as follows: IF Filter: 230 kHz Filter1: <20 Hz HPF...
  • Page 34 VHF (136‐174 MHz) Tuning Description Item Method Press the Enter key on the keyboard to confirm your settings. Click the “Transmit Off” button on Tuner. Click the dialog box below LOW_PORT. Select another channel and repeat Step 4 to Step 6. 10.

  • Page 35: Testing The Radio

    VHF (136‐174 MHz) Tuning Description Item Method Press the Enter key on the keyboard to confirm your settings. Connect the antenna connector of the radio to the RF port of HP8921, and set HP8921 to TX test mode. Receive Oscillator Open the Tuner software and go to “TUNE_DATA ->...
  • Page 36 VHF (136‐174 MHz) Tuning Description Step 5 Check all the tested items on Aeroflex 3920 and make sure they satisfy the following requirements:  Frequency Error≤100 Hz  Transmit Power: 4.7±0.3 W  FSK Error≤5%  Magnitude Error≤1% Receiving Performance Step 1 Open the Tuner software and go to “TEST ->...

  • Page 37: Pcb View

    9. PCB View Main Board PCB Top Layer...
  • Page 38 Main Board PCB Bottom Layer...

  • Page 39: Block Diagram

    VHF (136‐174 MHz) Block Diagram 10. Block Diagram 10.1 Overall Diagram of Radio I2C2 E2PROM BB Processor SCT3928 UART UART1 12.0MHz XTAL OMAP132 SPI2 STM32F101VET6 Security MCLK GPIOs Key Board 12.288MHz GPIOs SW_channel GPIOs GPIOs Audio Codec TLV3204 SPI3 GPIOs Audio preamp preamp...

  • Page 40: Block Diagram Of Power Supply Circuit

    VHF (136‐174 MHz) Block Diagram 10.2 Block Diagram of Power Supply Circuit POW-KEY-DET NTA7002N POWER_ON PWR_ON 3V3D 5VFGU To VCO XC6204F502PR To PLL 5VRT XC6204F502PR To TX 1V2D 3V6D DC-DC DC-DC To Sicomm core ADP2370ACPZ-R7 ADP2370ACPZ-R7 3V3A CODEC RP102N331B 3V3D V_BAT RP102N331B E2PROM...

  • Page 41: Block Diagram Of Baseband Circuit

    VHF (136‐174 MHz) Block Diagram 10.3 Block Diagram of Baseband Circuit 3.6V V_BAT DC-DC 3.6V DC-DC 1.2V 1.2V ADP2370ACPZ-R7 ADP2370ACPZ-R7 RP102N331B 3V3A Fuse POWER SW PLL_CLK EEPROM 7.4VDC PLL_CS PLL_DATA RP102N331B 3V3D PLL_LD FL_Fastlock_Ctrl Pre_Fastlock_Ctrl VCO_H_En RP102N331B 3V3A_RX 12MHZ VCO_L_En STM32F101VET6 TV1\APC EXT_interface...

  • Page 42: Block Diagram Of Transmitter Circuit

    VHF (136‐174 MHz) Block Diagram 10.4 Block Diagram of Transmitter Circuit...

  • Page 43: Block Diagram Of Receiver Circuit

    VHF (136‐174 MHz) Block Diagram 10.5 Block Diagram of Receiver Circuit Low- pass Filter T/ R SW Lo Amp 2SC3356 Lo OSC VC TCXO 19.2 MHz 2SC5108 Low- Noise Amp AT- 41511 BPF2 BPF1 BA4116 Mixer IF Filter IF Processor IF Amp HSMS- 2827 Tuned Voltage...

  • Page 44: Block Diagram Of Fgu Circuit

    VHF (136‐174 MHz) Block Diagram 10.6 Block Diagram of FGU Circuit VC_TXCO F=19.2MHz RF feedback LPF PLL Sky72310 Loop Filter...

  • Page 45: Schematic Diagram

    11. Schematic Diagram Main Processor Circuit 主处理器 主处理器 U101 U101 R102 R102 STM32F101VET6 STM32F101VET6 330K-F 330K-F 3V3D R101 R101 R186 R186 HCSN R103 R103 R187 R187 R104 R104 R105 R105 4.7k 4.7k PWR_ON POW-KEY-DET BEEP1 BEEP R188 R188 C102 C102 R106 R106 RFID_IQR...
  • Page 46 基带处理器+编解码器 Baseband Processor and Codec Circuit 基带处理器和编解码器 L202 L202 3V3A 3V3D1 BLM15PD121SN1 BLM15PD121SN1 R202 R202 C202 C202 C203 C203 R203 R203 3V3D1 0.1u 0.1u R204 R204 U201 U201 SCT3928 SCT3928 L201 L201 C207 NC C207 NC AF-OUT+ HPIDATA0 HPIDATA0 VDDIO33_1 TP205 TP205 3V3D...
  • Page 47 Power 电源 电源 V_BAT 5VFGU V_BAT U302 U302 L302 L302 L303 L303 J301 J301 F301 F301 Q301 Q301 Supply XC6204F502PR XC6204F502PR BLM18PG181SN1 BLM18PG181SN1 BLM18PG181SN1 BLM18PG181SN1 BAT-70ADJ3 BAT-70ADJ3 2.5A-32V 2.5A-32V Si2343CD Si2343CD Vout TP302 TP302 C302 0.1u C302 0.1u C304 C304 C305 C305 C306...
  • Page 48 Audio Circuit 音频 音频 TP403 TP403 TP404 TP404 TP401 TP401 TP402 TP402 SPK- SPK- SPK+ SPK+ SPK- SPK- SPK+ SPK+ V_BAT L401 3.3uH L401 3.3uH C401 0.1u C401 0.1u C439 C439 C440 C440 C402 C402 C438 C438 C403 C403 J403 J403 AF_OUT- AF_OUT-...
  • Page 49 IF Circuit of Receiver 接收中频 接收中频 Z501 Z501 450K 450K 3V3_RX_RF R504 R504 C501 C501 C504 C504 3V3_RX_RF 0.1u 0.1u 0.1u 0.1u C505 C505 0.1u 0.1u L503 L503 560nH 560nH R503 R503 C519 C519 C531 C531 C512 C512 R512 R512 C510 30p C510 30p 0.01u...
  • Page 50 Front-end Circuit of Receiver 接收前端 接收前端 3V3_RX_RF Q601 Q601 3V3A_RX EM6M2 EM6M2 L601 L601 R602 100 R602 100 BLM15PD121SN1 BLM15PD121SN1 C601 C601 C602 C602 C603 C603 L609 L609 R601 R601 R603 R603 R604 R604 780nH 780nH 0.1u 0.1u 470p 470p 1000p 1000p RX_En (1)
  • Page 51 发射自动控制 Auto Control Circuit of Transmitter 发射自动控制 7V4_PA V_BAT 7V4_PA V_BAT 5V_TX_RF R702 R702 R701 R701 0.1R 0.1R R703 R703 R704 R704 0.1R 0.1R D701 D701 R705 R705 R706 R706 150K 150K 1SS390 1SS390 VDD_OP R707 R707 0.1R 0.1R R708 R708 R709 R709...
  • Page 52 Tx Path Circuit 发射通路 发射通路 Q801 Q801 5VRT 5V_TX_RF EM6M2 EM6M2 L801 L801 BLM15PD121SN1 BLM15PD121SN1 C801 C801 C802 C802 R801 R801 0.1u 0.1u 470p 470p TX_En (1,7) C864 C864 470p 470p 5V_TX_RF 3V3D RT801 47k RT801 47k TEM-LEV-DET-TC (1) R802 R802 R803 R803...
  • Page 53 PLL Circuit 锁相环 锁相环 3V3_FGU TP901 TP901 3V3A_FGU_PLL PLL_Clk PLL_Clk L901 L901 R901 R901 PLL_Clk TP902 TP902 BLM15PD121SN1 BLM15PD121SN1 C901 C901 C902 C902 PLL_CS PLL_CS C905 C905 C903 C903 C904 C904 PLL_CS 4.7u 4.7u 0.1u 0.1u 470p 470p TP903 TP903 0.1u 0.1u 470p...
  • Page 54 FGU Circuit 频率产生单元 频率产生单元 5VFGU EM6M2 Q1002 EM6M2 Q1002 Q1003 Q1003 L1002 L1002 2SC4617 2SC4617 L1003 L1003 VCC_VCO_L VCC_VCO_L BLM15PD121SN1 BLM15PD121SN1 BLM15PD121SN1 BLM15PD121SN1 C1003 C1003 C1002 C1002 R1002 R1002 L1001 L1001 R1003 82K R1003 82K 4.7K 4.7K BLM15PD121SN1 BLM15PD121SN1 R1004 1K R1004 1K 470p 470p...

  • Page 55: Parts List

    VHF (136‐174 MHz) Parts List 12. Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description shielding B4F 6203698000000 D904 3303030800020 Switching diode cover VCO_BD B3H 6203699000000 T3H 6203694000000 IF shielding cover shielding cover shielding 2NDLO shielding B2H 6203828000000...
  • Page 56 VHF (136‐174 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C1046 3101050900000 9pF L303 T2H 3221506181000 Ferrite bead C1049 3101061000000 10pF L304 3221506181000 Ferrite bead C105 B2J 3101011040100 0.1uF L305 3221506181000 Ferrite bead C1050 3101050200010 2pF L306...
  • Page 57 VHF (136‐174 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C138 3101011030050 0.01uF L901 3221505121010 Ferrite bead C202 T3J 3101011040100 0.1uF L902 3221505121010 Ferrite bead C203 T3J 3101071060280 10uF L903 3221505121010 Ferrite bead C206 T3J 3101071060280 10uF L904...
  • Page 58 VHF (136‐174 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C257 B2K 3101011040100 0.1uF R1009 B2H 3001018230000 82KΩ C258 B2K 3101014710020 470pF R101 B3K 3001011010080 100Ω C259 B2J 3101011040100 0.1uF R1010 3001014730010 47KΩ...
  • Page 59 VHF (136‐174 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C353 T2K 3101062250000 2.2uF R121 B3K 3001011010080 100Ω C354 T3K 3101051040060 0.1uF R122 B3K 3001013300000 33Ω C355 T3K 3101052710000 270pF R123 3001011010080 100Ω...
  • Page 60 VHF (136‐174 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C440 T1C 3101012700000 27pF R184 B3K 3001011010080 100Ω C501 T4H 3101011040100 0.1uF R185 3001054730010 47KΩ C504 T3H 3101011040100 0.1uF R186 3001011010080 100Ω C505 T4H 3101011040100 0.1uF R187...
  • Page 61 VHF (136‐174 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C652 T4G 3101052000020 20pF R409 T2C 3001056810000 680Ω C653 T3F 3101011040100 0.1uF R410 3001050000000 0Ω C654 T3G 3101053300000 33pF R411 T1C 3001054790000 4.7Ω C655 T4F 3101050500000 5pF R413...
  • Page 62 VHF (136‐174 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C845 B2C 3101051020010 1000pF R625 3001051020000 1KΩ C846 B3C 3101051000020 10pF R631 B4E 3101053300000 33pF C850 B1F 3101051020010 1000pF R701 3099080398010 0.39Ω C851 B1G 3101054710010 470pF R703...
  • Page 63 VHF (136‐174 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description D1006 B3H 3303030800020 Switching diode R919 3001011000050 10Ω D1007 B2J 3304010100890 Varactor R920 3001010000050 0Ω D1008 B3G 3303030800020 Switching diode R921 3001011020060 1KΩ...
  • Page 64 VHF (136‐174 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description management IC Schottky barrier Power D407 T3E 3303030300000 1002 U306 B4D 3608006000000 diode management IC Power D408 T4E 3399040600000 PROTECTION 1003 U307 3608006000000 management IC DIODE...
  • Page 65 UHF (400‐470 MHz)
  • Page 66 UHF (400‐470 MHz) Contents Contents 1. Product Controls ..........................1 2. Disassembly and Assembly ........................ 2 3. Exploded View and Packing Guide ....................4 3.1 Exploded View ..........................4 3.2 Packing Guide ..........................6 4. Specifications ............................7 5. Circuit Descriptions ..........................9 5.1 Baseband Section..........................

  • Page 67: Product Controls

    UHF (400‐470 MHz) Product Controls 1. Product Controls Part Name Part Name ○ ○ PTT (Push-to-Talk) Key Accessory Connector ○ ○ SK1 (Side Key 1) Microphone ○ ○ SK2 (Side Key 2) Battery Latch ○ ○ Channel Selector Knob Antenna ○...

  • Page 68: Disassembly And Assembly

    UHF1 (400‐470 MHz) Disassembly and Assembly 2. Disassembly and Assembly This section is designed to introduce the way to disassemble the radio. To assemble the radio, do vice versa. Caution Position the waterproof ring into the radio properly during reassembly. ...
  • Page 69 UHF (400‐470 MHz) Disassembly and Assembly Step 4 Remove the two screws on the aluminum chassis. Step 5 Remove the aluminum chassis and the main board. Step 6 Remove the eight screws on the main board. Step 7 Unsolder the soldering joint of the antenna connector and remove the main board.

  • Page 70: Exploded View And Packing Guide

    UHF1 (400‐470 MHz) Exploded View and Packing Guide 3. Exploded View and Packing Guide Exploded View Parts list: Note For parts that are not marked with Part Number, their Part Numbers may vary with the frequency band. Part No. Description Qty.
  • Page 71 UHF (400‐470 MHz) Exploded View and Packing Guide Part No. Description Qty. Part No. Description Qty. M2.5*6.0 mm Waterproof Ring 5001210000720 Speaker 6100527100000 for Screw Main Waterproof 7400244000000 Speaker Pad 6101228000000 Ring Aluminum 6202121000000 Speaker Fixing Sheet 6300269000000 Chassis Waterproof Ring Self-tapping Screw 7101904020200 6101037000000...

  • Page 72: Packing Guide

    UHF1 (400‐470 MHz) Exploded View and Packing Guide Packing Guide...

  • Page 73: Specifications

    UHF (400‐470 MHz) Specifications 4. Specifications General Frequency Range 400‐470 MHz Channel Capacity Channel Spacing 25 kHz/12.5 kHz Operating Voltage 7.4 V (rated) Battery 1500 mAh Li-Ion battery Battery Life (5-5-90 Duty Cycle, High TX Power) Analog: about 12 h High-capacity 1800 mAh Li-Ion Battery Digital: about 16 h Operating Temperature...
  • Page 74 UHF1 (400‐470 MHz) Specifications Transmitter Power Output 4 W/1 W -36 dBm<1 GHz Spurious Emission -30 dBm>1 GHz  ±2.5 kHz @ 12.5 kHz Modulation Limiting  ±5.0 kHz @ 25 kHz  40 dB @ 12.5 kHz FM Noise ...

  • Page 75: Circuit Descriptions

    UHF1 (400‐470 MHz) Circuit Descriptions 5. Circuit Descriptions Baseband Section 5.1.1 Power Supply Module Diagram of Power Control The power supply employs a single cell 7.4 V Li-ion battery. The RF section uses LDO to generate a 5 V voltage for FGU and PLL circuits, as well as the control parts of TX circuits. The baseband section uses LDO to generate a 3.3 V voltage for Codec, MCU and SCT3928.

  • Page 76: Control Module

    UHF1 (400‐470 MHz) Circuit Descriptions 5.1.2 Control Module The radio employs the STM32F101VET6(MCU)+SCT3928(Baseband IC) control solution. STM32F101VET6 is the main controller unit (MCU), while SCT3928 is the baseband processor chip, which is used for analog and digital modulation/demodulation, as well as digital voice encoding/decoding. MCU communicates with SCT3928 via HPI BUS and connects to 512K EEPROM via I2C BUS.

  • Page 77: Audio Module

    UHF1 (400‐470 MHz) Circuit Descriptions 5.1.3 Audio Module Audio Diagram The audio processing section uses SCT3928 and TLV320AIC3204. The audio amplifier uses TDA2822D. The diagram is as follows: These two signals go to FGU for This signal is down converted by modulation RX end and output by BA4116 3V0D...

  • Page 78: Rf Section

    UHF1 (400‐470 MHz) Circuit Descriptions RF Section 5.2.1 Transmitter Circuit The transmitter circuit is mainly composed of:  RF Power Amplifier Circuit  Low-pass Filter Circuit (for suppressing harmonics)  Auto Power Control (APC) Circuit RF Power Amplifier Circuit The carrier signal (TX signal) generated by TX voltage controlled oscillator (VCO) is modulated and amplified via the buffer amplifier first, then passes through a pre-driver amplifier for primary power amplification.
  • Page 79 UHF1 (400‐470 MHz) Circuit Descriptions voltage via the sampling resistor and subtracter circuit (composed of the first operational amplifier). This voltage is compared with that of the APC circuit (output by DAC) at the second operational amplifier. Then the error voltage, which is output by the second operational amplifier, controls TX power by controlling the compensated gate bias voltage of the amplifiers (including the driver amplifier and the final-stage amplifier).

  • Page 80: Receiver Circuit

    UHF1 (400‐470 MHz) Circuit Descriptions 5.2.2 Receiver Circuit The receiver circuit is mainly composed of RF band-pass filter, low-noise amplifier, mixer, IF filter, IF amplifier and IF processor. S21≤1.5dB Ripple Inband≤ 1dB Stop band attenuation: -30dBc 3V3FGU 3V3dc Lo Amp Low-Noise Amp Lo input level≥7dBm 2SC3356...

  • Page 81: Frequency Generation Unit (Fgu)

    UHF1 (400‐470 MHz) Circuit Descriptions Receiver Back-end The processed first IF signal is sent to IC BA4116 for second mixing with the third harmonic signal (selected as the second LO signal) of the PLL crystal to get the 450 kHz second IF signal. Then the first IF signal passes through the 450 kHz ceramic filter which filters out the spurious signal before the second IF signal is amplified and frequency-discriminated.
  • Page 82 UHF1 (400‐470 MHz) Circuit Descriptions VC_TXCO Mod_2 Fc=19.2MHz A=0.1Vpp~2.0Vpp PLL Sky72310 RF feedback LPF 3.0v for core&Vp FGU Close Loop: Compare frequence:4.8MHz Prescaler Level：50~250mVpp S21=-3dB PN: ≤-80 (dBc/Hz)@1KHz Fpass=500MHz PN: ≤-112 (dBc/Hz)@12.5KHz Fstop=800MHz PN: ≤-120 (dBc/Hz)@25KHz Astop=40dB PN: ≤-136 (dBc/Hz)@100KHz PN: ≤-145 (dBc/Hz)@1MHz Two Point modulation：...

  • Page 83: Troubleshooting Flow Chart

    UHF1 (400‐470 MHz) Troubleshooting Flow Chart 6. Troubleshooting Flow Chart Control Circuit Check the control circuit Power-on indication is The RF circuit is driven The control circuit normal?[1] normally?[2] is normal. Verify RF power supply circuit (including U302, U303, U306 and U310) and control circuit.

  • Page 84: Receiver Circuit

    UHF1 (400‐470 MHz) Troubleshooting Flow Chart Receiver Circuit No Receiving Output of Output of 3V3A_RX is 3V3_RX_RF is Check U306 normal?[2] normal?[1] Check Q601 Quiescent operating point of Check Q602 Q602 is normal?[3] Quiescent operating point of Check Q604 Q604 is normal?[4] Input IF signal at Check Z601 to test whether...
  • Page 85 UHF1 (400‐470 MHz) Troubleshooting Flow Chart Descriptions of normal situation: [1] Output voltage by Q601 Pin 3 is about 3.3 V. [2] Output voltage by U306 Pin 5 or input voltage by Q601 Pin 4 is about 3.3V. [3] Check the collector voltage and base voltage of Q602 when the radio is not receiving. Normally, the base voltage is about 0.7 V, the collector voltage is about 2.7 V and the emitter voltage is 0 V.

  • Page 86: Transmitter Circuit

    UHF1 (400‐470 MHz) Troubleshooting Flow Chart Transmitter Circuit Caution The following tests must be performed under the 7.4 V power supply. No Power Output Power supply Check power supply is normal?[1] circuit TV/APC is Check DAC VGG is normal?[2] normal?[3] output circuit Check 5VRT 5V_TX_RF is...
  • Page 87 UHF1 (400‐470 MHz) Troubleshooting Flow Chart Descriptions of normal situation: [1] Voltage of the power supply is about 7.4 V. [2] For low power, VGG is 1.8 to 2.1 V; for high power, VGG is 2.4 to 2.8 V. [3] For low power, TV/APC is 1 to 1.3 V; for high power, TV/APC is 1.8 to 2.1 V. [4] TX_En is about 3.3 V.

  • Page 88: Fgu Circuit

    UHF1 (400‐470 MHz) Troubleshooting Flow Chart FGU Circuit Check FGU circuit Check the 5VFGU, VCC_VCO, power supply 3V3_FGU and circuit 3V3A_FGU_PLL are normal? Q1002, Q1004, Q1005, Replace Q1001 Q1001 and Q1010 are Does VCO oscillate? Q1011 and Q901 are and Q1010 normal?[2] normal?[1] Replace Q1002,...
  • Page 89 UHF1 (400‐470 MHz) Troubleshooting Flow Chart Descriptions of normal situation: [1] When the radio is transmitting, output voltage by Q1004 Pin 3 is about 4.2 V. When the radio is receiving, output voltage by Q1002 Pin 3 is about 4.2 V. [2] When the radio is transmitting, the emitter voltage, collector voltage and base voltage of Q1010 are about 1.8 V, about 4.18 V and about 2.6 V respectively.

  • Page 90: Interface Definition

    UHF1 (400‐470 MHz) Interface Definition 7. Interface Definition Descriptions on J401 and J402 double-pin interface for earpiece, programming and downloading are listed below. Interface Pin No. Signal Illustration SPK- TXD+ J401 SPK+ SPK+ SPK- J402 RXD- OPTEL1...

  • Page 91: Tuning Description

    UHF1 (400‐470 MHz) Tuning Description 8. Tuning Description Required Test Instruments  Radio communication test sets: Aeroflex 3920 and HP8921  Power supply: 3 A/10 V  Multimeter  Tuner software Tuning Procedures 8.2.1 Tuning the Radio After re-assembling the radio, you need to tune it with the Tuner software. Note The items to be tuned and tuning operations are described in the table below.
  • Page 92 UHF1 (400‐470 MHz) Tuning Description Item Method Click the “Transmit On” button on Tuner. Adjust the power to the required level as follows: L: 1.2±0.1 W Connect the antenna connector of the radio to the RF port of HP8921, and set HP8921 to TX test mode. Set HP8921 as follows: IF Filter: 230 kHz Filter1: <20 Hz HPF...
  • Page 93 UHF1 (400‐470 MHz) Tuning Description Item Method Press the Enter key on the keyboard to confirm your settings. Click the “Transmit Off” button on Tuner. Click the dialog box below LOW_PORT. Select another channel and repeat Step 4 to Step 6. 10.

  • Page 94: Testing The Radio

    UHF1 (400‐470 MHz) Tuning Description Item Method Press the Enter key on the keyboard to confirm your settings. Connect the antenna connector of the radio to the RF port of HP8921, and set HP8921 to TX test mode. Receive Oscillator Open the Tuner software and go to “TUNE_DATA ->...
  • Page 95 UHF1 (400‐470 MHz) Tuning Description Step 5 Check all the tested items on Aeroflex 3920 and make sure they satisfy the following requirements:  Frequency Error≤100 Hz  Transmit Power: 4.2±0.3 W  FSK Error≤5%  Magnitude Error≤1% Receiving Performance Step 1 Open the Tuner software and go to “TEST ->...

  • Page 96: Pcb View

    9. PCB View Main Board PCB Top Layer...
  • Page 97 Main Board PCB Bottom Layer...

  • Page 98: Block Diagram

    UHF1 (400‐470 MHz) Block Diagram 10. Block Diagram 10.1 Overall Diagram of Radio I2C2 E2PROM BB Processor SCT3928 UART UART1 12.0MHz XTAL OMAP132 SPI2 STM32F101VET6 Security MCLK GPIOs Key Board 12.288MHz GPIOs SW_channel GPIOs GPIOs Audio Codec TLV3204 SPI3 GPIOs Audio preamp preamp...

  • Page 99: Block Diagram Of Power Supply Circuit

    UHF1 (400‐470 MHz) Block Diagram 10.2 Block Diagram of Power Supply Circuit POW-KEY-DET NTA7002N POWER_ON PWR_ON 3V3D 5VFGU To VCO XC6204F502PR To PLL 5VRT XC6204F502PR To TX 1V2D 3V6D DC-DC DC-DC To Sicomm core ADP2370ACPZ-R7 ADP2370ACPZ-R7 3V3A CODEC RP102N331B 3V3D V_BAT RP102N331B E2PROM...

  • Page 100: Block Diagram Of Baseband Circuit

    UHF1 (400‐470 MHz) Block Diagram 10.3 Block Diagram of Baseband Circuit 3.6V V_BAT DC-DC 3.6V DC-DC 1.2V 1.2V ADP2370ACPZ-R7 ADP2370ACPZ-R7 RP102N331B 3V3A Fuse POWER SW PLL_CLK EEPROM 7.4VDC PLL_CS PLL_DATA RP102N331B 3V3D PLL_LD FL_Fastlock_Ctrl Pre_Fastlock_Ctrl VCO_H_En RP102N331B 3V3A_RX 12MHZ VCO_L_En STM32F101VET6 TV1\APC EXT_interface...

  • Page 101: Block Diagram Of Transmitter Circuit

    UHF1 (400‐470 MHz) Block Diagram 10.4 Block Diagram of Transmitter Circuit...

  • Page 102: Block Diagram Of Receiver Circuit

    UHF1 (400‐470 MHz) Block Diagram 10.5 Block Diagram of Receiver Circuit Low- pass Filter T/ R SW Lo Amp 2SC3356 Lo OSC VC TCXO 19.2 MHz 2SC5108 Low- Noise Amp AT- 41511 BPF2 BPF1 BA4116 Mixer IF Filter IF Processor IF Amp HSMS- 2827 Tuned Voltage...

  • Page 103: Block Diagram Of Fgu Circuit

    UHF1 (400‐470 MHz) Block Diagram 10.6 Block Diagram of FGU Circuit VC_TXCO F=19.2MHz RF feedback LPF PLL Sky72310 Loop Filter...

  • Page 104: Schematic Diagram

    Main Processor Circuit 主处理器 主处理器 11. Schematic Diagram U101 U101 R102 R102 STM32F101VET6 STM32F101VET6 330K-F 330K-F 3V3D R101 R101 R186 R186 HCSN R103 R103 R187 R187 PWR_ON POW-KEY-DET R188 R188 C102 C102 R106 R106 RFID_IQR PA2/USART2_TX R107 R107 R189 R189 150K-F 150K-F PLLSEL...
  • Page 105 Baseband Processor and Codec Circuit 基带处理器和编解码器 基带处理器和编解码器 L202 L202 3V3A BLM15PD121SN1 BLM15PD121SN1 R202 R202 3V3A C202 C202 C203 C203 R203 R203 3V3D1 0.1u 0.1u R204 R204 U201 U201 SCT3928 SCT3928 L201 L201 C207 1u C207 1u AF-OUT+ HPIDATA0 HPIDATA0 VDDIO33_1 TP205 TP205 3V3D...
  • Page 106 Power 电源 电源 V_BAT 5VFGU V_BAT U302 U302 L302 L302 L303 L303 Supply J301 J301 F301 F301 Q301 Q301 XC6204F502PR XC6204F502PR BLM18PG181SN1 BLM18PG181SN1 BLM18PG181SN1 BLM18PG181SN1 BAT-70ADJ3 BAT-70ADJ3 2.5A-32V 2.5A-32V Si2343CD Si2343CD Vout TP302 TP302 C302 0.1u C302 0.1u C304 C304 C305 C305 C306...
  • Page 107 Audio Circuit 音频 音频 TP403 TP403 TP404 TP404 TP401 TP401 TP402 TP402 SPK- SPK- SPK+ SPK+ SPK- SPK- SPK+ SPK+ V_BAT L401 3.3uH L401 3.3uH C401 0.1u C401 0.1u C439 C439 C440 C440 C402 C402 C438 C438 C403 C403 J403 J403 Q401 Q401...
  • Page 108 IF Circuit of Receiver 接收中频 接收中频 Z501 Z501 450K 450K 3V3_RX_RF R504 R504 C501 C501 C504 C504 3V3_RX_RF 0.1u 0.1u 0.1u 0.1u C505 C505 0.1u 0.1u L503 L503 330nH 330nH R503 R503 C519 C519 C531 C531 C512 C512 R512 R512 C510 22p C510 22p 0.01u...
  • Page 109 Front-end Circuit of Receiver 接收前端 接收前端 3V3_RX_RF Q601 Q601 3V3A_RX EM6M2 EM6M2 L601 L601 R602 68 R602 68 BLM15PD121SN1 BLM15PD121SN1 C601 C601 C602 C602 C603 C603 L609 L609 R601 R601 R603 R603 R604 R604 100nH 100nH 0.1u 0.1u 470p 470p 1000p 1000p RX_En (1)
  • Page 110 Auto Control Circuit of Transmitter 发射自动控制 发射自动控制 7V4_PA V_BAT 7V4_PA V_BAT 5V_TX_RF R702 R702 R701 R701 0.1R 0.1R R703 R703 R704 R704 0.1R 0.1R D701 D701 R705 R705 R706 R706 390K 390K 1SS390 1SS390 VDD_OP R707 R707 0.1R 0.1R R708 R708 R709 R709...
  • Page 111 Tx Path Circuit 发射通路 发射通路 Q801 Q801 5VRT 5V_TX_RF EM6M2 EM6M2 L801 L801 BLM15PD121SN1 BLM15PD121SN1 C801 C801 C802 C802 R801 R801 0.1u 0.1u 470p 470p TX_En (1,7) C864 C864 470p 470p 5V_TX_RF 3V3D RT801 47k RT801 47k TEM-LEV-DET-TC (1) R802 R802 R803 R803...
  • Page 112 PLL Circuit 锁相环 锁相环 3V3_FGU TP901 TP901 3V3A_FGU_PLL PLL_Clk PLL_Clk L901 L901 R901 R901 PLL_Clk TP902 TP902 BLM15PD121SN1 BLM15PD121SN1 C901 C901 C902 C902 PLL_CS PLL_CS C905 C905 C903 C903 C904 C904 PLL_CS 4.7u 4.7u 0.1u 0.1u 470p 470p TP903 TP903 0.1u 0.1u 470p...
  • Page 113 频率产生单元 FGU Circuit 频率产生单元 5VFGU EM6M2 Q1002 EM6M2 Q1002 Q1003 Q1003 L1002 L1002 2SC4617 2SC4617 L1003 L1003 VCC_VCO_L VCC_VCO_L BLM15PD121SN1 BLM15PD121SN1 BLM15PD121SN1 BLM15PD121SN1 C1003 C1003 C1002 C1002 R1002 R1002 L1001 L1001 R1003 82K R1003 82K 4.7K 4.7K BLM15PD121SN1 BLM15PD121SN1 R1004 1K R1004 1K 470p 470p...

  • Page 114: Parts List

    UHF1 (400‐470 MHz) Parts List 12. Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description shielding B4F 6203698000000 D701 3303030800020 Switching diode cover VCO_BD B3H 6203699000000 D801 B2C 3303030800040 Switching diode shielding cover shielding B2H 6203700000000 D803...
  • Page 115 UHF1 (400‐470 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C1042 3101014710020 470pF L205 3221505121010 Ferrite bead C1043 3101011040080 0.1uF L206 3221505121010 Ferrite bead C1044 3101050590020 0.5pF L209 3001060000000 0Ω C1045 3101050600010 6pF L210 3221505121010 Ferrite bead...
  • Page 116 UHF1 (400‐470 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C138 3101011030050 0.01uF L817 B1G 3210305150010 15nH C202 T3J 3101011040090 0.1uF L819 B2G 3101052700000 27pF C203 T3J 3101071060010 10uF L901 3221505121010 Ferrite bead C206 T3J 3101071060010 10uF L902...
  • Page 117 UHF1 (400‐470 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C257 B2K 3101011040090 0.1uF R1007 3001018230000 82KΩ C258 B2K 3101014710020 470pF R1008 3001011020060 1KΩ C259 B2J 3101011040090 0.1uF R1009 B2H 3001018230000 82KΩ C260 B2K 3101014710020 470pF R101...
  • Page 118 UHF1 (400‐470 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C353 T2K 3101062250000 2.2uF R127 B3K 3001011010080 100Ω C354 T3K 3101051040060 0.1uF R128 3001013300000 33Ω C355 T3K 3101052710000 270pF R129 3001011010080 100Ω C356 T2K 3101074750000 4.7uF R130...
  • Page 119 UHF1 (400‐470 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C439 T1C 3101012700000 27pF R190 3001011010080 100Ω C440 T1C 3101012700000 27pF R191 B3K 3001051520000 1.5KΩ C501 T4H 3101011040100 0.1uF R192 B3K 3001011530010 15KΩ C504 T3H 3101011040100 0.1uF R193...
  • Page 120 UHF1 (400‐470 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C651 T4F 3101051500020 15pF R416 T4D 3001051020000 1KΩ C652 T4G 3101051500020 15pF R417 3001051010040 100Ω C653 T3F 3101011040090 0.1uF R418 3001051030050 10KΩ C654 T3G 3101051500020 15pF R419...
  • Page 121 UHF1 (400‐470 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description C850 B1F 3101054710010 470pF R711 3001052210010 220Ω C851 B1G 3101051530070 0.015uF R715 T2G 3001051040000 100KΩ C852 B1F 3101061300000 13pF R717 T2G 3001050000000 0Ω C853 B1G 3101052200010 22pF R718...
  • Page 122 UHF1 (400‐470 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description D1003 3303030100010 Switching diode RN101 3005051010010 100Ω D1004 B1H 3304010100220 Varactor RN103 B4K 3005051010010 100Ω D1005 B1H 3304010100220 Varactor RN104 3005051010010 100Ω D1006 B3H 3303030800020 Switching diode RN105...
  • Page 123 UHF1 (400‐470 MHz) Parts List Print Print No. Ref No. Part No. Description No. Ref No. Part No. Description (super Power D109 T3B 3307110100080 U301 T5H 3608025000010 green) management IC protection Power D110 T1F 3399040600000 U302 T2G 3608015000270 diode management IC protection Power D301...
  • Page 124 Hytera Communications Corporation Limited. 2015 Hytera Communications Corporation Limited. 1616300000530 2015 06 24 L07157...

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